WO1992005509A1 - Extending dynamic range of stored image data base - Google Patents
Extending dynamic range of stored image data base Download PDFInfo
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- WO1992005509A1 WO1992005509A1 PCT/US1991/006464 US9106464W WO9205509A1 WO 1992005509 A1 WO1992005509 A1 WO 1992005509A1 US 9106464 W US9106464 W US 9106464W WO 9205509 A1 WO9205509 A1 WO 9205509A1
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 12
- 230000005693 optoelectronics Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000013519 translation Methods 0.000 description 4
- 230000014616 translation Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
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- G06T5/92—
Definitions
- the present invention relates in general to digitized image data processing systems and is particularly directed to a mechanism for extending the dynamic range of a database which stores digitally encoded color images.
- Digital imagery processing systems such as those employed for processing digitized color photographic images, customarily digitized images by way of an opto- electronic scanner, the output of which is encoded to some prescribed digital encoding resolution (or digital code width) that encompasses a range of values over which the contents of a scene, such as that captured on a (color) photographic recording medium may vary.
- this range of values R is less than the density vs. exposure latitude of the film, but is sufficiently wide to encompass those film density values that can be expected to be encountered for a particular scene.
- the digitized image is mapped into a set of digital codes, each of which has a digital resolution corresponding to the dynamic range of a digitized image data base (e.g. frame store) , the contents of which may be adjusted in the course of driving an output device, for example enabling a print engine to output a high quality color print.
- a digitized image data base e.g. frame store
- the mapping of the quantized output of a digital image scanning device may translate the contents of a given portion of the density vs.
- supplemental scene balance image processing may operate so as adjust one or more pixel values upwardly, causing a further increase in the number of pixel values whose encoded values are maximal.
- the above discussed problem is solved by extending the dynamic range of the digitized image database, so as to permit a variation or shifting of the encoded pixel values without 'clipping', to provide a limited window or range of values into which specular reflectance image points, such as a reflection from a car bumper or a specular reflection of sunlight reflection off a water surface, may be encoded and stored, and to provide shiftability at the low end of the encoding range.
- the present invention is directed to a method of enabling the dynamic range of the digitized image data base to be effectively extended beyond the range of values into which the digital codes output by the image scanner are mapped by an image processing (scene balance) mechanism.
- those digital codes into which the scanner output has been mapped by the image processing operator are converted into a set of 'reduced-range' digital codes of the same digital resolution but having a smaller range of image content values than the dynamic range of the digitized image data base.
- the code conversion mechanism operates to convert a maximum value of 100% white reflectance to an encoded value that is less than the upper limit of the dynamic range of the database. For the foregoing example of an eight bit encoding and storage resolution, such a value may be somewhat less than the maximum of 255 (e.g.
- Figure 1 diagrammatically illustrates the variation of density vs. log exposure for a color photographic negative, upon which is superimposed a range of values R less than the density vs. exposure latitude of the film;
- Figure 2 diagrammatically illustrates a photographic color film processing system
- Figure 3 diagrammatically illustrates the manner in which the present invention extends the dynamic range of a digitized image database, to permit a variation of encoded pixel values.
- Figure 2 diagrammatically illustrates a photographic color slide processing system in which the present invention may be employed.
- a photographic color slide processing system in which the present invention may be employed.
- such a system may be of the type described, for example, in copending Patent application Serial Number , filed , by Steven Kristy, entitled Multiresolution Digtial Imagery Photofinishing System, assigned to the assignee of the present application and the disclosure of which is incorporated herein.
- the system described in the above-referenced copending application is merely an example of one type of system in which the invention may be used and is not to be considered limitative of the invention.
- the invention may be incorporated in any digitized imagery processing system.
- photographic images such as those captured on 35mm color film 10 are scanned by an opto- electronic film scanner 12, such as a commercially available such as an Eikonix, Model 1345 high spatial resolution digital scanner, which outputs digitally encoded data representative of the response of its imaging sensor pixel array onto which a photographic image contained in a respective color film frame is projected.
- an opto- electronic film scanner 12 such as a commercially available such as an Eikonix, Model 1345 high spatial resolution digital scanner, which outputs digitally encoded data representative of the response of its imaging sensor pixel array onto which a photographic image contained in a respective color film frame is projected.
- This digitally encoded data or
- the 'digitized', image is coupled in the form of an imaging pixel array- representative bit map to an attendant image processing workstation 14, which contains a frame store and image processing application software through which the digitized image may be processed (e.g. enlarged, rotated, cropped, subjected to a scene balance correction mechanism, etc.) to achieve a desired base image appearance and configuration.
- a transportable medium such as a compact disc 16
- a reproduction device 20 for example a relatively moderate resolution consumer television set 22, or output as a hardcopy print, as by way of a high resolution thermal color printer 24.
- each captured image is stored in the form of a low resolution image and a plurality of residual images to enhance data processing speed.
- the format of the data is that of a digitized image bit map 22, each low resolution pixel value of which has some prescribed code width (e.g. twenty-four bits or eight bits per color) corresponding to the dynamic range of the database (digital memory) in which the digitized image is stored.
- the output device to which the disc ⁇ resident base image data may be delivered is not necessarily identified at the time that the base image is prepared and stored on the disc, it may be necessary to perform further processing of the stored image in the course of producing an image in a 'finalized' or 'finished' output form.
- This further processing may involve scene balance mechanism that tailors the image in accordance with the parameters of the output display or print engine and typically involves a shift or translation of the encoded data values of the scene. (In addition, the image may contain specular highlights that cannot be adequately represented by the maximal encoding value specified by the scene balance mechanism. )
- Figure 3 diagrammatically illustrates the manner in which the present invention solves this limited dynamic range problem by extending the dynamic range of the digitized image database, so as to permit a variation or shifting of the encoded pixel values without 'clipping', and to provide a limited window or range of values into which specular reflectance image points, such as a reflection from a car bumper or specular reflection of sunlight off a water surface, may be encoded and stored.
- trace 30 represents the range of values obtained by the image processing operator corresponding to dynamic range of the database of interest (eight bits in the present example) , with a maximum available value of 255 representing a pixel value of 100% white reflectance and a minimum available value of 0 representing a pixel value of low reflectance.
- each of the image-representative codes output by the image processing operator is subjected to a code conversion operator resident within the image processing software of workstation 14, so that a value of 100% white reflectance has an encoded value that is somewhat less than the maximum of 255, for example a value of 225 as shown in trace 32 in Figure 3.
- the conversion mechanism may also provide for a shift at the low end of the range, as shown by offset 33.
- This limited 'compression' of the encoded imagery data values effectively fits the encoded data into a reduced portion 34 of the dynamic range of the database and allows for the encoding or translation of extended data values.
- converting a 100% white reflectance value to a compressed encoded value of 225 leaves a limited window 36 of values (here 30 values) at the upper end of the encoding range, to allow for shifts in the digitized imagery data and the placement into this window of specular highlights that are beyond the 100% white reflectance maximum.
- the code conversion operator of the present invention is not necessarily referenced to any particular code value (e.g. 255 for 100% white reflectance) .
- the imagery data processing operator scene balance mechanism
- it targets the location of each encoded value relative to the dynamic range of the storage device so as to ensure that there is a high reflectance window at the upper end of the range sufficient to accommodate further processing corrections and extreme reflectance highlights in the image.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69130526T DE69130526T2 (en) | 1990-09-14 | 1991-09-11 | EXPANSION OF THE DYNAMIC AREA OF AN IMAGE DATABASE |
EP91918585A EP0506921B1 (en) | 1990-09-14 | 1991-09-11 | Extending dynamic range of stored image data base |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/582,306 US5224178A (en) | 1990-09-14 | 1990-09-14 | Extending dynamic range of stored image database |
US582,306 | 1990-09-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992005509A1 true WO1992005509A1 (en) | 1992-04-02 |
Family
ID=24328633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1991/006464 WO1992005509A1 (en) | 1990-09-14 | 1991-09-11 | Extending dynamic range of stored image data base |
Country Status (6)
Country | Link |
---|---|
US (1) | US5224178A (en) |
EP (1) | EP0506921B1 (en) |
JP (1) | JP3105539B2 (en) |
CA (1) | CA2067100C (en) |
DE (1) | DE69130526T2 (en) |
WO (1) | WO1992005509A1 (en) |
Cited By (3)
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GB2305802A (en) * | 1995-09-28 | 1997-04-16 | Samsung Display Devices Co Ltd | Displaying grey scales on an image display unit |
EP0810551A1 (en) * | 1996-05-30 | 1997-12-03 | Agfa-Gevaert N.V. | Detection of and correction for specular reflections in digital image acquisition |
US6061091A (en) * | 1996-05-30 | 2000-05-09 | Agfa Gevaert N.V. | Detection of and correction for specular reflections in digital image acquisition |
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JP3237103B2 (en) * | 1992-05-25 | 2001-12-10 | 船井電機株式会社 | Playback method of photo data |
WO1994006247A1 (en) * | 1992-09-08 | 1994-03-17 | Paul Howard Mayeaux | Machine vision camera and video preprocessing system |
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US5651078A (en) * | 1994-07-18 | 1997-07-22 | Thomson Consumer Electronics, Inc. | Method and apparatus for reducing contouring in video compression |
DE4433440A1 (en) * | 1994-09-20 | 1996-03-21 | Microbox Dr Welp Gmbh & Co | Method for generating a two-dimensional image matrix of pixels and film card scanner for carrying out this method |
US5726771A (en) * | 1994-10-31 | 1998-03-10 | Hewlett-Packard Company | System and method for optimizing tonal resolution in an optical scanner |
DE9419287U1 (en) * | 1994-12-02 | 1995-03-16 | Symicron Gmbh Software Enginee | Device for digitizing images present on a section of a film strip |
US5694481A (en) * | 1995-04-12 | 1997-12-02 | Semiconductor Insights Inc. | Automated design analysis system for generating circuit schematics from high magnification images of an integrated circuit |
US5883973A (en) * | 1996-02-20 | 1999-03-16 | Seiko Epson Corporation | Method and apparatus for processing a document by segmentation into text and image areas |
US5757975A (en) * | 1996-11-21 | 1998-05-26 | Xerox Corporation | Artifact reduction for large dynamic range input data in JPEG compression |
US7158670B1 (en) | 1999-05-21 | 2007-01-02 | Microsoft Corporation | Visually error-free color image representation |
US6748107B1 (en) * | 1999-08-05 | 2004-06-08 | Microsoft Corporation | Implementation and uses of XsRGB |
US6741753B1 (en) * | 2000-09-05 | 2004-05-25 | Hewlett-Packard Development Company, L.P. | Method and system of local color correction using background liminance masking |
US7064740B2 (en) | 2001-11-09 | 2006-06-20 | Sharp Laboratories Of America, Inc. | Backlit display with improved dynamic range |
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US8050512B2 (en) * | 2004-11-16 | 2011-11-01 | Sharp Laboratories Of America, Inc. | High dynamic range images from low dynamic range images |
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US7525528B2 (en) | 2004-11-16 | 2009-04-28 | Sharp Laboratories Of America, Inc. | Technique that preserves specular highlights |
US7473745B2 (en) * | 2005-09-02 | 2009-01-06 | Equistar Chemicals, Lp | Preparation of multimodal polyethylene |
US9143657B2 (en) | 2006-01-24 | 2015-09-22 | Sharp Laboratories Of America, Inc. | Color enhancement technique using skin color detection |
US8121401B2 (en) | 2006-01-24 | 2012-02-21 | Sharp Labortories of America, Inc. | Method for reducing enhancement of artifacts and noise in image color enhancement |
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-
1991
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- 1991-09-11 WO PCT/US1991/006464 patent/WO1992005509A1/en active IP Right Grant
- 1991-09-11 CA CA002067100A patent/CA2067100C/en not_active Expired - Lifetime
- 1991-09-11 DE DE69130526T patent/DE69130526T2/en not_active Expired - Lifetime
- 1991-09-11 EP EP91918585A patent/EP0506921B1/en not_active Expired - Lifetime
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2305802A (en) * | 1995-09-28 | 1997-04-16 | Samsung Display Devices Co Ltd | Displaying grey scales on an image display unit |
US5917471A (en) * | 1995-09-28 | 1999-06-29 | Samsung Display Devices, Co., Ltd. | Method for displaying gray scales of image display unit |
GB2305802B (en) * | 1995-09-28 | 2000-03-08 | Samsung Display Devices Co Ltd | Method for displaying gray scales of image display unit |
CN1107237C (en) * | 1995-09-28 | 2003-04-30 | 三星电管株式会社 | Method for displaying gray scales of image display unit |
EP0810551A1 (en) * | 1996-05-30 | 1997-12-03 | Agfa-Gevaert N.V. | Detection of and correction for specular reflections in digital image acquisition |
US6061091A (en) * | 1996-05-30 | 2000-05-09 | Agfa Gevaert N.V. | Detection of and correction for specular reflections in digital image acquisition |
Also Published As
Publication number | Publication date |
---|---|
JPH05502748A (en) | 1993-05-13 |
US5224178A (en) | 1993-06-29 |
CA2067100C (en) | 1998-08-11 |
CA2067100A1 (en) | 1992-03-15 |
EP0506921B1 (en) | 1998-11-25 |
JP3105539B2 (en) | 2000-11-06 |
DE69130526T2 (en) | 1999-06-10 |
EP0506921A1 (en) | 1992-10-07 |
DE69130526D1 (en) | 1999-01-07 |
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