CA2690987A1 - Method and apparatus for chroma key production - Google Patents
Method and apparatus for chroma key production Download PDFInfo
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- CA2690987A1 CA2690987A1 CA2690987A CA2690987A CA2690987A1 CA 2690987 A1 CA2690987 A1 CA 2690987A1 CA 2690987 A CA2690987 A CA 2690987A CA 2690987 A CA2690987 A CA 2690987A CA 2690987 A1 CA2690987 A1 CA 2690987A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/74—Circuits for processing colour signals for obtaining special effects
- H04N9/75—Chroma key
Abstract
The method and apparatus for generating an adaptive chroma key includes taking into consideration foreground object information during the creation of a composite scene. The luminance and chrominance of an area of interest between a fore-ground key and a background scene are considered and accounted for during the created of the composite scene.
Description
METHOD AND APPARATUS FOR CHROMA KEY PRODUCTION
This application claims priority to International Patent Application Serial No.
PCT/US2007/015254 entitied "Method and Apparatus for Chroma Key Production", filed on June 29, 2007 which is hereby incorporated by reference in its entirety.
The present principles relate to chroma keying. More particularly, it retates to the production of an adaptive chroma key.
A chrorria key generally places foreground objects in a background scene.
Since chroma key parameters are calculated for every, field 'based on the foreground scene only, the foreground object cannot adapt to the background scene lighting. Thus, the use of ambient or artificial light chariges.
In fact, chroma key parameters are based on homogenized studio-lighting conditions rather than the lighting in the background scene. This type -of lighting mismatch fails to produce a natural chroma key.
It is an aspect of the present principles to provide an adapative chroma key that overcomes the shortfalls of the prior art.
This and other aspects are achieved by the method for producing'a chroma' key which includes determining an area of interest (AOI) for a composite scene using a foreground key, and generating a chroma key taking into consirieration physical properties of pixels in the determined AOL
20. In accordance with another aspect of the present principles the apparatus for producing a chroma key includes a source selection device configured to determine an area of interest (AOI) for a,composite scene using a foreground key and generate a chroma key taking into consideration physical properties of pixels in the determined AOI. The source selection device could include= a plurality of input sources, a processor, switching logic in communication with the processor, and an adaptive chroma key sub-system connected to the processor and switching logic, said adaptive chroma key sub-system operating under the control of the processor to selectively combine two or more of the input sources for the 5, composite scene.
Other aspects and features of the present principles will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the *drawings are designed solely for purposes of illustration and not as a definition of the limits of the present principles, for which reference should. be made to the appended claims.- It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
In the drawings wherein like reference numerals denote similar components throughout the views:
Figure 1 is a graphical representation of a foreground scene in a green-colored virtual studio set;
Figure 2 is a graphical representation of the foreground objects in the scene;
Figure 3 is. a graphical representation of the background scene intended for '20 use with the foregoing scene;
Figure 4 is a graphical representation of the foreground key;
Figure 5 is graphical representation of the composite output 'of both the foreground and background scenes;
This application claims priority to International Patent Application Serial No.
PCT/US2007/015254 entitied "Method and Apparatus for Chroma Key Production", filed on June 29, 2007 which is hereby incorporated by reference in its entirety.
The present principles relate to chroma keying. More particularly, it retates to the production of an adaptive chroma key.
A chrorria key generally places foreground objects in a background scene.
Since chroma key parameters are calculated for every, field 'based on the foreground scene only, the foreground object cannot adapt to the background scene lighting. Thus, the use of ambient or artificial light chariges.
In fact, chroma key parameters are based on homogenized studio-lighting conditions rather than the lighting in the background scene. This type -of lighting mismatch fails to produce a natural chroma key.
It is an aspect of the present principles to provide an adapative chroma key that overcomes the shortfalls of the prior art.
This and other aspects are achieved by the method for producing'a chroma' key which includes determining an area of interest (AOI) for a composite scene using a foreground key, and generating a chroma key taking into consirieration physical properties of pixels in the determined AOL
20. In accordance with another aspect of the present principles the apparatus for producing a chroma key includes a source selection device configured to determine an area of interest (AOI) for a,composite scene using a foreground key and generate a chroma key taking into consideration physical properties of pixels in the determined AOI. The source selection device could include= a plurality of input sources, a processor, switching logic in communication with the processor, and an adaptive chroma key sub-system connected to the processor and switching logic, said adaptive chroma key sub-system operating under the control of the processor to selectively combine two or more of the input sources for the 5, composite scene.
Other aspects and features of the present principles will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the *drawings are designed solely for purposes of illustration and not as a definition of the limits of the present principles, for which reference should. be made to the appended claims.- It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
In the drawings wherein like reference numerals denote similar components throughout the views:
Figure 1 is a graphical representation of a foreground scene in a green-colored virtual studio set;
Figure 2 is a graphical representation of the foreground objects in the scene;
Figure 3 is. a graphical representation of the background scene intended for '20 use with the foregoing scene;
Figure 4 is a graphical representation of the foreground key;
Figure 5 is graphical representation of the composite output 'of both the foreground and background scenes;
Figure 6 is a graphical representation of the Area of Interest (AOI) in the composite scene;
Figure 7 is a graphical representation of the composite scene with both brighter background and foreground objects;
Figure 8 is a graphical representation of the composite scene with both darker background and foreground objects;
Figures 9a-9c are graphical representations showing how 'different hues in a background scene can create different but matching foreground objects;
Figure 10a is a flow diagram of the luminance determination for the display of the composite image according to an implementation of the, present principles;
Figure 10b is a block diagram of the determination of the AOI for the.chroma key according to an implementatiori of the present principles;
Figure 11 is flow diagram of the chrominance determination and application-for -the display of the composite image according to an implementation of the present principles;
Figure.1.2 is a block diagram of a switcher apparatus.configured to implement the adaptive chroma keying of the present principles; and Figure 13 is a block diagram of an adaptive chroma key subs system according to an implementation of the present principles.
Generally speaking, a chroma key allows the placement of foreground objects in a background scene.. Since the chroma key parameters are calculated for every field based on the foreground scene only, the foreground object cannot adapt to the background scene lighting (e.g., ambient and artificial) changes. - In fact, the chroma key parameters are often homogenized for studio-lighting conditions rather than the lighting in the background scene.
The present principles provides an alternative to this chroma keying scheme by allowing an adaptive creation of the chroma key using luminance and chrominance 5.information from the backgrourid scene.
Figures 1-5 show some background information for understanding the concepts of the present principles. Figure 1 shows a foreground scene 10 (represented by the people in the picture) and a green-colored virtual studio set 12. Figure 2 shows the foreground objects 10 without the virtual studio set 12. Figure 3 shows a backgrotind scene 14 to be displayed on the cirtual studio set. Figure 4 shows a foreground key 16.
rep~esenting the images of the foregoing. scene to be superimposed over the background scene.. Figure 5 is a representation of the composite output image resulting from combination of the background scene 14 and the foreground scene 10.
Initially, and in accordance with the present principles, a determination as to the area of interest (AOI) between the foreground scene and the background scene -is made (step. 102 Figure 10a). Referring to Figure 10b, in order to *do this,. a foreground key is overlayed onto the background scene (110), and an identification of all the pixels of the background scene that falls inside the foreground key is made (112).
This identification constitutes the AOI. Figure 6 shows a graphical representation of the AOI
18 as obtained from this process.
In accordance with one implementation, the information from,the background scene is used by the chroma key logic to.adaptively create the chroma key. In doing this, the method includes considering one or more physical propefties of the pixels in the determined AOI in order to create the chroma key. In the present example, these physical properties include the luminance and the chrominance of the pixels.
Figure 10a shows the method 100 for considering the luminance of the AOI, and Figure 11 shows the method 150 for considering the chrominance of the AOI.
5 Referring to FigLire 10a; initially the determination (102) as to the AOI
for the composite scene is made.. The average luminance of pixels in the AOl is then calculated (104), and the average luminance of. a sampled area in the foreground.
scene is also calculated (106). Once these luminance calculations have been made, the luma in the foreground scene is linked to the luma in the AOI (108). In other words, we are applying the difference (delta) in luma AOI to luma in the foreground scene for.every field. If the background has dramatic lighting changes, such as a video clip show through bright and dark streets of Manahattan. The foreground object (e.g., a new reader -or report) will adapt to the background scene and' change its lighting accordingly. Figure 7 shows an example of a brighter background having brighter -15 foreground objects, and Figure 8 shows an example of a darker background having darker foreground objects.
Figure 11 shows an example of the method 150 where the chrominance signal is considered. After the determination 102 of the AOI; it is determined (120) whether a constant vector is applied to all pixels in the AOI. If not, the foreground scene remains unchanged (124). If there is a constant vector applied to all pixels in the AOI, a small percentage of the sarrie constant vector is applied to the resulting foreground scene.
For example, if the background scene is a disco club with rotating multi-colored light beams, the foreground object adapts to hue changes in the background scene (i.e., if a red beam of light falls on the AOI, a slight tinge of red will appear on the foreground object as well. Thus, different hues in the background scene'can create different, but matching objects in the foreground. This concept is shown in the exemplary images of Figures 9a-9c. In each figure, the hue is, different, resulting in a change in the foreground object color and thereby an overall change of the entire composite image displayed. Figure 9b shows the effect of a redish hue (represented by an array of very small dots covering the entire Figure 9b) added to the background lighting.and the overall effect of the same on the foreground objects (i.e., the matching of the same with the background), while Figure 9c shows the effect of a greenish hue (represented by an array of very small dashes covering the entire Figure 9c) in the background scene.
Figure 12 shows a block diagram of a switcher system 200 programmed to operate in accordance with the present principles. The switcher 202 includes a plurality of inputs 208, a processor 204 and switching logic 206 in communication with the processor. The processor 208 can include an onboard memory 210, or may be linked to an external storage medium, such as a hard disk drive, a compact disc drive, a flash memory or other solid state memory device, or any other memory storage means. The adaptive chroma key sub-system 207 is communication with the processor 204 and switching logic 206 and is configured to perform the method of the present principle and take one of said inputs 208 having a background scene and selectively combine it with another input having -a foreground scene to provide a desired composite scene at its output 212.
Figure 13 shows a block diagram of the adaptive chroma key sub-system 207 according to an implementation of the present principles. The foreground video and foreground key 252 are interpolated by.interpolator 258. After hue selection (via primary hue selector 262 and secondary hue selector 266) and suppression (via primary suppression 264 and secondary suppression 268, the video 270 is passed to the next logical subsystem in the switcher 202 (e.g., switching . logic 206).
The secondary hue selector 266 outputs the foreground information which processed (clip &
gain 278) before the background changes are applied 280. The background video'254 and background key. 256 are interpolated. by' interpolator 260, and the AOI is then determined 272. As described * above, once the AOJ has been determined; the Luma change 274 and chrorna change 276 of the AOI is determined and are applied 280 to the foreground. At this stage, the offset 282 is applied to the foreground key signal and the foreground key 212 is output.
The various aspects, implementations, and features may be implemented in one or more of a variety of manners, even if described above without reference to a particular manner or using only one= manner. For example, .the various aspects, implementations, and features may be'implemented using, for example, one or more of a method, an apparatus, an apparatus or processing device for .15 performing a method, a program or other set of instructions, an apparatus that includes a program or a set of instructions, and a computer readable medium.
.An apparatus may include, for example, 'discrete or integrated hardware, firmware, and software. As an example, an apparatus may include, for example, a processor, which refers to processing devices in general, including, for example;
a microprocessor, an integrated circuit, or a programmable logic device. As another example, an 'apparatus may include one or more computer readable media having instructions for carrying out one or more processes.
A computer readable medium may include, for example, a'software carrier or other storage device such as, for example, a hard disk, a compact diskette, a random access memory ("RAM"), or a read-only memory ("ROM"): A computer readable medium also may include, for example; formatted electromagnetic waves encoding or transmitting instructions. Instructions may be, for example, in hardware, firmware, software, or in an electromagnetic wave. Instructions may be found in, for example, an operating system, a separate application, or a combination of the two. -A processor may be characterized, therefore, as, for example, both a device configured to carry out a process and a device that includes a computer readable medium having instructions for 'carrying -out a process.
A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made. For example, elements of different implementations may be combined, supplemented, modified, or removed to produce other implementations. Accordingly, other implementations are within.
the scope of the following claims:
Figure 7 is a graphical representation of the composite scene with both brighter background and foreground objects;
Figure 8 is a graphical representation of the composite scene with both darker background and foreground objects;
Figures 9a-9c are graphical representations showing how 'different hues in a background scene can create different but matching foreground objects;
Figure 10a is a flow diagram of the luminance determination for the display of the composite image according to an implementation of the, present principles;
Figure 10b is a block diagram of the determination of the AOI for the.chroma key according to an implementatiori of the present principles;
Figure 11 is flow diagram of the chrominance determination and application-for -the display of the composite image according to an implementation of the present principles;
Figure.1.2 is a block diagram of a switcher apparatus.configured to implement the adaptive chroma keying of the present principles; and Figure 13 is a block diagram of an adaptive chroma key subs system according to an implementation of the present principles.
Generally speaking, a chroma key allows the placement of foreground objects in a background scene.. Since the chroma key parameters are calculated for every field based on the foreground scene only, the foreground object cannot adapt to the background scene lighting (e.g., ambient and artificial) changes. - In fact, the chroma key parameters are often homogenized for studio-lighting conditions rather than the lighting in the background scene.
The present principles provides an alternative to this chroma keying scheme by allowing an adaptive creation of the chroma key using luminance and chrominance 5.information from the backgrourid scene.
Figures 1-5 show some background information for understanding the concepts of the present principles. Figure 1 shows a foreground scene 10 (represented by the people in the picture) and a green-colored virtual studio set 12. Figure 2 shows the foreground objects 10 without the virtual studio set 12. Figure 3 shows a backgrotind scene 14 to be displayed on the cirtual studio set. Figure 4 shows a foreground key 16.
rep~esenting the images of the foregoing. scene to be superimposed over the background scene.. Figure 5 is a representation of the composite output image resulting from combination of the background scene 14 and the foreground scene 10.
Initially, and in accordance with the present principles, a determination as to the area of interest (AOI) between the foreground scene and the background scene -is made (step. 102 Figure 10a). Referring to Figure 10b, in order to *do this,. a foreground key is overlayed onto the background scene (110), and an identification of all the pixels of the background scene that falls inside the foreground key is made (112).
This identification constitutes the AOI. Figure 6 shows a graphical representation of the AOI
18 as obtained from this process.
In accordance with one implementation, the information from,the background scene is used by the chroma key logic to.adaptively create the chroma key. In doing this, the method includes considering one or more physical propefties of the pixels in the determined AOI in order to create the chroma key. In the present example, these physical properties include the luminance and the chrominance of the pixels.
Figure 10a shows the method 100 for considering the luminance of the AOI, and Figure 11 shows the method 150 for considering the chrominance of the AOI.
5 Referring to FigLire 10a; initially the determination (102) as to the AOI
for the composite scene is made.. The average luminance of pixels in the AOl is then calculated (104), and the average luminance of. a sampled area in the foreground.
scene is also calculated (106). Once these luminance calculations have been made, the luma in the foreground scene is linked to the luma in the AOI (108). In other words, we are applying the difference (delta) in luma AOI to luma in the foreground scene for.every field. If the background has dramatic lighting changes, such as a video clip show through bright and dark streets of Manahattan. The foreground object (e.g., a new reader -or report) will adapt to the background scene and' change its lighting accordingly. Figure 7 shows an example of a brighter background having brighter -15 foreground objects, and Figure 8 shows an example of a darker background having darker foreground objects.
Figure 11 shows an example of the method 150 where the chrominance signal is considered. After the determination 102 of the AOI; it is determined (120) whether a constant vector is applied to all pixels in the AOI. If not, the foreground scene remains unchanged (124). If there is a constant vector applied to all pixels in the AOI, a small percentage of the sarrie constant vector is applied to the resulting foreground scene.
For example, if the background scene is a disco club with rotating multi-colored light beams, the foreground object adapts to hue changes in the background scene (i.e., if a red beam of light falls on the AOI, a slight tinge of red will appear on the foreground object as well. Thus, different hues in the background scene'can create different, but matching objects in the foreground. This concept is shown in the exemplary images of Figures 9a-9c. In each figure, the hue is, different, resulting in a change in the foreground object color and thereby an overall change of the entire composite image displayed. Figure 9b shows the effect of a redish hue (represented by an array of very small dots covering the entire Figure 9b) added to the background lighting.and the overall effect of the same on the foreground objects (i.e., the matching of the same with the background), while Figure 9c shows the effect of a greenish hue (represented by an array of very small dashes covering the entire Figure 9c) in the background scene.
Figure 12 shows a block diagram of a switcher system 200 programmed to operate in accordance with the present principles. The switcher 202 includes a plurality of inputs 208, a processor 204 and switching logic 206 in communication with the processor. The processor 208 can include an onboard memory 210, or may be linked to an external storage medium, such as a hard disk drive, a compact disc drive, a flash memory or other solid state memory device, or any other memory storage means. The adaptive chroma key sub-system 207 is communication with the processor 204 and switching logic 206 and is configured to perform the method of the present principle and take one of said inputs 208 having a background scene and selectively combine it with another input having -a foreground scene to provide a desired composite scene at its output 212.
Figure 13 shows a block diagram of the adaptive chroma key sub-system 207 according to an implementation of the present principles. The foreground video and foreground key 252 are interpolated by.interpolator 258. After hue selection (via primary hue selector 262 and secondary hue selector 266) and suppression (via primary suppression 264 and secondary suppression 268, the video 270 is passed to the next logical subsystem in the switcher 202 (e.g., switching . logic 206).
The secondary hue selector 266 outputs the foreground information which processed (clip &
gain 278) before the background changes are applied 280. The background video'254 and background key. 256 are interpolated. by' interpolator 260, and the AOI is then determined 272. As described * above, once the AOJ has been determined; the Luma change 274 and chrorna change 276 of the AOI is determined and are applied 280 to the foreground. At this stage, the offset 282 is applied to the foreground key signal and the foreground key 212 is output.
The various aspects, implementations, and features may be implemented in one or more of a variety of manners, even if described above without reference to a particular manner or using only one= manner. For example, .the various aspects, implementations, and features may be'implemented using, for example, one or more of a method, an apparatus, an apparatus or processing device for .15 performing a method, a program or other set of instructions, an apparatus that includes a program or a set of instructions, and a computer readable medium.
.An apparatus may include, for example, 'discrete or integrated hardware, firmware, and software. As an example, an apparatus may include, for example, a processor, which refers to processing devices in general, including, for example;
a microprocessor, an integrated circuit, or a programmable logic device. As another example, an 'apparatus may include one or more computer readable media having instructions for carrying out one or more processes.
A computer readable medium may include, for example, a'software carrier or other storage device such as, for example, a hard disk, a compact diskette, a random access memory ("RAM"), or a read-only memory ("ROM"): A computer readable medium also may include, for example; formatted electromagnetic waves encoding or transmitting instructions. Instructions may be, for example, in hardware, firmware, software, or in an electromagnetic wave. Instructions may be found in, for example, an operating system, a separate application, or a combination of the two. -A processor may be characterized, therefore, as, for example, both a device configured to carry out a process and a device that includes a computer readable medium having instructions for 'carrying -out a process.
A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made. For example, elements of different implementations may be combined, supplemented, modified, or removed to produce other implementations. Accordingly, other implementations are within.
the scope of the following claims:
Claims (19)
1. A method for producing a chroma key comprising:
determining an area of interest (AOI) for a composite scene using a foreground key;
generating a chroma key taking into consideration physical properties of pixels in the determined AOI.
determining an area of interest (AOI) for a composite scene using a foreground key;
generating a chroma key taking into consideration physical properties of pixels in the determined AOI.
2. The method of claim 1, wherein said determining comprises:
overlaying a foreground key on a background scene; and identifying pixels in the background scene that fall, inside the foreground key.
overlaying a foreground key on a background scene; and identifying pixels in the background scene that fall, inside the foreground key.
3. The method of claim 1, wherein said generating further comprises:
calculating an average luminance of pixels in the AOI;
calculating an average luminance of a sampled area in the foreground scene; and linking the luma in the foreground scene to the luma in the AOI.
calculating an average luminance of pixels in the AOI;
calculating an average luminance of a sampled area in the foreground scene; and linking the luma in the foreground scene to the luma in the AOI.
4. The method of claim 1, wherein said generating further comprises considering a chrominance signal in the AOI.
5. The method of claim 4, wherein said considering further comprises:
determining whether a constant vector is applied to all pixels in the AOI; and when a constant vector is applied to all pixels, applying a small percentage of the same constant vector to a resulting foreground scene.
determining whether a constant vector is applied to all pixels in the AOI; and when a constant vector is applied to all pixels, applying a small percentage of the same constant vector to a resulting foreground scene.
6. The method of claim 4, wherein said considering further comprises:
determining whether a constant vector is applied to all pixels in the AOI; and when a constant vector is not applied to all pixels, making no change to a resulting foreground scene.
determining whether a constant vector is applied to all pixels in the AOI; and when a constant vector is not applied to all pixels, making no change to a resulting foreground scene.
7. The method of claim 5, wherein said small percentage comprises 5-10%.
8. An apparatus for producing a chroma key, the apparatus comprising:
means (204, 207) for determining an area of interest (AOI) fow a composite scene using a foreground key; and means (204, 207) for generating a chroma key taking into consideration physical properties of pixels in the determined AOI.
means (204, 207) for determining an area of interest (AOI) fow a composite scene using a foreground key; and means (204, 207) for generating a chroma key taking into consideration physical properties of pixels in the determined AOI.
9. The apparatus of claim 8, further comprising:
means (204, 207) for overlaying a foreground key on a background scene; and means (204, 207) for identifying pixels in the background scene that fall inside the foreground key.
means (204, 207) for overlaying a foreground key on a background scene; and means (204, 207) for identifying pixels in the background scene that fall inside the foreground key.
10. The apparatus of 8, further comprising:
means (204, 207) calculating an average luminance of pixels in the AOI;
means (204, 207) calculating an average luminance of a sampled area in the foreground scene; and means (204, 207) linking the luma in the foreground scene to the luma in the AOI.
means (204, 207) calculating an average luminance of pixels in the AOI;
means (204, 207) calculating an average luminance of a sampled area in the foreground scene; and means (204, 207) linking the luma in the foreground scene to the luma in the AOI.
11. The apparatus of 8, wherein said generating means further comprises means (204, 207) for considering a chrominance signal in the AOI.
12. The apparatus of 11, wherein said considering means comprises:
means (204, 207) for determining whether a constant vector is applied to all pixels in the AOI; and means (204, 207) for applying a small percentage of the same constant vector to a resulting foreground scene when it is determined a constant vector is applied to all pixels.
means (204, 207) for determining whether a constant vector is applied to all pixels in the AOI; and means (204, 207) for applying a small percentage of the same constant vector to a resulting foreground scene when it is determined a constant vector is applied to all pixels.
13. The apparatus of 11, wherein said considering means comprises:
means (204, 207) for determining whether a constant vector is applied to all pixels in the AOI; and means (124) for making no change to a resulting foreground scene when a constant vector is not applied to all pixels
means (204, 207) for determining whether a constant vector is applied to all pixels in the AOI; and means (124) for making no change to a resulting foreground scene when a constant vector is not applied to all pixels
14. The apparatus of 11, wherein said small percentage comprises 5-10%.
15. An apparatus for producing a chroma key comprising:
a source selection device (202) configured to determine an area of interest (AOI) for a composite scene using a foreground key and generate a chroma key taking into consideration physical properties of pixels in the determined AOI.
a source selection device (202) configured to determine an area of interest (AOI) for a composite scene using a foreground key and generate a chroma key taking into consideration physical properties of pixels in the determined AOI.
16. The apparatus of claim 15, wherein said source selection device comprises:
a plurality of input sources (208);
a processor (204);
switching logic (206) in communication with the processor; and an adaptive chroma key sub-system (207) connected to the processor and switching logic, said adaptive chroma key sub-system operating under the control of the processor to selectively combine two or more of the input sources for the composite scene.
a plurality of input sources (208);
a processor (204);
switching logic (206) in communication with the processor; and an adaptive chroma key sub-system (207) connected to the processor and switching logic, said adaptive chroma key sub-system operating under the control of the processor to selectively combine two or more of the input sources for the composite scene.
17. The apparatus of claim 15, wherein the physical properties of pixels comprise luminance and chrominance signals.
18. The apparatus of claim 17, wherein said source selection device is configured to calculate an average luminance of pixels in an area of interest AOI
and a sampled area in a foreground scene, and generates the chroma key by providing link data for linking the luma in the foreground scene to the luma in the AOI.
and a sampled area in a foreground scene, and generates the chroma key by providing link data for linking the luma in the foreground scene to the luma in the AOI.
19. The apparatus of claim 17, wherein said source selection device is configured to determine whether a constant vector is applied to all pixels in the AOI, and when a constant vector is applied to all pixels in the AOI, to apply a small percentage of the same constant vector to a resulting foregoing scene in the composite scene.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2007015254 | 2007-06-29 | ||
| USPCT/US2007/015254 | 2007-06-29 | ||
| PCT/US2007/020192 WO2009005511A1 (en) | 2007-06-29 | 2007-09-18 | Method and apparatus for chroma key production |
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| Publication Number | Publication Date |
|---|---|
| CA2690987A1 true CA2690987A1 (en) | 2009-01-08 |
| CA2690987C CA2690987C (en) | 2016-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2690987A Expired - Fee Related CA2690987C (en) | 2007-06-29 | 2007-09-18 | Method and apparatus for chroma key production |
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| Country | Link |
|---|---|
| JP (1) | JP5209713B2 (en) |
| CN (1) | CN101690245A (en) |
| CA (1) | CA2690987C (en) |
| WO (1) | WO2009005511A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10719923B2 (en) | 2017-12-20 | 2020-07-21 | Baidu Online Network Technology (Beijing) Co., Ltd. | Method and apparatus for processing image |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5494537B2 (en) * | 2011-03-25 | 2014-05-14 | カシオ計算機株式会社 | Image processing apparatus and program |
| US20150289338A1 (en) * | 2014-04-08 | 2015-10-08 | Revolution Display, Inc. | Automatic chroma key background generator with incident key lighting |
| CN109308687A (en) * | 2018-09-06 | 2019-02-05 | 百度在线网络技术（北京）有限公司 | Method and apparatus for adjusting brightness of image |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345313A (en) * | 1992-02-25 | 1994-09-06 | Imageware Software, Inc | Image editing system for taking a background and inserting part of an image therein |
| US5907315A (en) * | 1993-03-17 | 1999-05-25 | Ultimatte Corporation | Method and apparatus for adjusting parameters used by compositing devices |
| DE19619090A1 (en) * | 1996-04-30 | 1997-11-13 | Cfb Gmbh | Device and method for generating a composite image |
| JP2004007770A (en) * | 1998-08-31 | 2004-01-08 | Hitachi Software Eng Co Ltd | Image compositing method, and its device |
| US6674485B2 (en) * | 1998-08-31 | 2004-01-06 | Hitachi Software Engineering Co., Ltd. | Apparatus and method for image compositing |
| JP3591575B2 (en) * | 1998-12-28 | 2004-11-24 | 日立ソフトウエアエンジニアリング株式会社 | Image synthesizing apparatus and image synthesizing method |
| US7006155B1 (en) * | 2000-02-01 | 2006-02-28 | Cadence Design Systems, Inc. | Real time programmable chroma keying with shadow generation |
| US6538396B1 (en) * | 2001-09-24 | 2003-03-25 | Ultimatte Corporation | Automatic foreground lighting effects in a composited scene |
-
2007
- 2007-09-18 JP JP2010514725A patent/JP5209713B2/en not_active Expired - Fee Related
- 2007-09-18 CN CN200780053582A patent/CN101690245A/en active Pending
- 2007-09-18 CA CA2690987A patent/CA2690987C/en not_active Expired - Fee Related
- 2007-09-18 WO PCT/US2007/020192 patent/WO2009005511A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10719923B2 (en) | 2017-12-20 | 2020-07-21 | Baidu Online Network Technology (Beijing) Co., Ltd. | Method and apparatus for processing image |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5209713B2 (en) | 2013-06-12 |
| JP2010532629A (en) | 2010-10-07 |
| CA2690987C (en) | 2016-01-19 |
| WO2009005511A1 (en) | 2009-01-08 |
| CN101690245A (en) | 2010-03-31 |
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