CN100574413C - The replacement image processing unit and the method thereof of visual telephone terminal - Google Patents
The replacement image processing unit and the method thereof of visual telephone terminal Download PDFInfo
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- CN100574413C CN100574413C CN 200610097664 CN200610097664A CN100574413C CN 100574413 C CN100574413 C CN 100574413C CN 200610097664 CN200610097664 CN 200610097664 CN 200610097664 A CN200610097664 A CN 200610097664A CN 100574413 C CN100574413 C CN 100574413C
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Abstract
The present invention relates to visual telephone terminal, relate in particular to and set in advance various replacement image forms, make replacement image processing unit and the method thereof that also can carry out the visual telephone terminal of video call between terminating machine with compress mode gap.The replacement image processing method of picture telephone terminating machine of the present invention is, after the other side's visual telephone terminal is connected, discern the codec of the other side's visual telephone terminal support of above-mentioned connection, from setting in advance the replacement image file of storage, the user reads the bit stream of the codec that the other side's visual telephone terminal of above-mentioned identification supports, be transferred to the other side's visual telephone terminal, thus the video call of operation replacement image.Even different, also can carry out the video call of replacement image with the codec that the distant terminal machine is supported.
Description
Technical field
The present invention relates to visual telephone terminal, relate in particular to and set in advance various replacement image forms, make replacement image processing unit and the processing method thereof that also can carry out the visual telephone terminal of video call between terminating machine with compress mode gap.
Background technology
Recently, along with the prosperity of image compression/reduction technique and image transmission technology, Yi Bian seeing the other side's image, Yi Bian the video telephone technology of conversation sharply develops.Such as representative IMT-2000, UMTS terminating machine etc.
Fig. 1 is the summary pie graph of existing video-phone system.
With reference to Fig. 1, set the 1st visual telephone terminal 10 and be transmission side, the 2nd visual telephone terminal 20 describes for the recipient, the 1st visual telephone terminal 10 will compress to specific image compression unit 12 by the image of camera 10 inputs, the image of its compression is transferred to recipient's the 2nd visual telephone terminal 20 by transmission ends 13.
Above-mentioned the 2nd visual telephone terminal 20 receives the data that received by receiving terminal 21, behind the decoding compressed image data of image-decoding portion 22, is presented at picture display part 23.
In such a way, the 2nd visual telephone terminal 20 also is transferred to image the 1st visual telephone terminal 10, makes the user of two terminating machines can see mutually that image converses.
Use this video telephone may occur not wishing to transmit the situation of own image sometimes.As, handle clothesline, or be reluctant to reveal own position etc.
For this reason, at being reluctant that the picture with oneself is transferred to the other side's situation, safety (Privacy) pattern or replacement image mode etc. have been developed.That is, give the other side with the Still Image Transmission that terminating machine is stored in advance, the moving image bit stream (bit stream) that maybe will select is transferred to the other side, makes it show replacement image.
Safe mode or replacement image that general video telephone uses are not to transmit after the data compression of will catch by camera, but with rest image or in advance the moving image of the file format of the storage terminating machine that is transferred to the recipient transmit the image of alternate user picture.
But when rest image that aforesaid image is as an alternative selected or moving image bit stream use to the safe mode of video telephone or replacement image, if the problem of the image bit stream of own desired transmission will appear transmitting in the image compressed format that the not corresponding the other side's video telephone of the rest image of above-mentioned selection or moving image uses.Promptly allow to transmission, also the problem that the distant terminal machine can't show can occur.
Summary of the invention
The 1st purpose of the present invention is, when using video telephone, makes it can make the image that is used to substitute in advance.
The 2nd purpose of the present invention is, when using video telephone, makes it can extract the bit stream of the codec of the current use of decision from the file of image store as an alternative, transmits.
The 3rd purpose of the present invention is, visual telephone terminal generates in advance and stores different replacement image forms, when replacement image is set, with its codec flow transmission, make between the terminating machine that utilizes mutual different compress modes and can carry out conversation on video telephone as the receiving side terminal machine.
The 4th purpose of the present invention is, generate image stream that compresses with the compress mode of terminating machine use and the image stream that compresses with other compressed format respectively, and these are tied to a transfer files form, generate the replacement image file, with this when connecting video telephone, can transmit the replacement image that the distant terminal machine is supported, make it can utilize the replacement image of the compressing multimedia digital signal codec that is suitable for the receiving side terminal machine to carry out conversation on video telephone.
The 5th purpose of the present invention is, connects before the video telephone, behind the transform coding that carries out compressing image, the image stream behind original compressing image stream and the transform coding is tied to Standard File Format, generates replacement image file and storage.Make and carrying out video telephone when being connected, can extract codec (CODEC) stream that be suitable for the receiving side terminal machine, transmit from above-mentioned replacement image file with the receiving side terminal machine.
For achieving the above object, the replacement image processing method of visual telephone terminal of the present invention is characterized in that, is made of following steps:
For transmission can the phonovision terminating machine, with the other side's visual telephone terminal step of connecting;
Discern the step of the codec that the other side's visual telephone terminal of above-mentioned connection supports;
When replacement image is set, read bit stream, be transferred to the step of the other side's visual telephone terminal corresponding to the codec of the other side's visual telephone terminal of above-mentioned identification from the replacement image file of storage in advance.
Above-mentioned replacement image file should have at least 2 compressing image streams supporting compressing multimedia digital signal codec respectively.
Above-mentioned replacement image file should comprise that original compressing image that each terminating machine is supported flows and the image behind its transform coding is flowed and header information.
Above-mentioned replacement image file should be with the Standard File Format form storage of visual telephone terminal.
Above-mentioned replacement image file should form with the MPEG4 file format.
If above-mentioned original compressing image stream is the MPEG4 form, the then above-mentioned image stream that carries out behind the transform coding should be form H.26L.
If above-mentioned original compressing image stream is form H.26L, the then above-mentioned image stream that carries out behind the transform coding should be the MPEG4 form.
The replacement image processing unit of the visual telephone terminal of the embodiment of the invention has as the lower part:
Compress and decoding device at the compression of image and the image of decoding; Can support at least 2 image compressing multimedia digital signal codecs, original compressing image stream translation is encoded to the conversion control of the image stream of different compressed format; Generation comprises original compressing image stream and carries out the replacement image file generator of the replacement image compressed format files of the image stream behind the transform coding by above-mentioned conversion control; Store the internal memory of above-mentioned replacement image compressed format files; In the conversation on video telephone, if the user is provided with replacement image, read the replacement image stream that is suitable for the other side's visual telephone terminal codec from above-mentioned replacement image compressed format files, be transferred to the reception/transmitting device of the other side's visual telephone terminal.
Above-mentioned conversion control should be provided with the decoder of the above-mentioned original compressing image stream of decoding and the encoder of original compressive flow of the above-mentioned decoding of encoding with different compress modes.
Above-mentioned file generator should produce the replacement image compressed format files with the MPEG4 file format, and the original compressing image of formation flows on the video data track of above-mentioned MPEG4 file format, constituting above-mentioned image stream after carrying out transform coding on the voice data track of above-mentioned MPEG4 file format, two image stream informations of above-mentioned formation are being inserted respectively to relevant track.
If above-mentioned original compressing image stream is the MPEG4 form, then the image stream of above-mentioned transform coding should be form H.26L.
If above-mentioned original compressing image stream is form H.26L, then the image stream of above-mentioned transform coding should be the MPEG4 form.
As mentioned above, the replacement image processing unit and the method thereof of visual telephone terminal of the present invention, its advantage is, to supported all CODEC of visual telephone terminal, produce at least two replacement image streams, when reality connects video telephone, the CODEC stream of the enough distant terminal machines of its energy support is transmitted, make replacement image can be suitable for the file that image compress mode that general video telephone uses can't be suitable for this, the amplitude that allows the spendable replacement image of terminating machine user select becomes big, can use the video compression format of various kind.
Description of drawings
Fig. 1 is existing video-phone system pie graph.
Fig. 2 is a video-phone system pie graph of the present invention.
Fig. 3 is the integration pie graph of conversion control of the present invention.
Fig. 4 is the summary pie graph of general MPEG4 file format.
Fig. 5 is the summary pie graph of the MPEG4 that comprises replacement image stream of the specific embodiment of the invention.
Fig. 6 is the summary pie graph when the MPEG4 document flow of the embodiment of the invention is used as replacement image H.263.
Fig. 7 is the summary pie graph when the H.263 document flow of the embodiment of the invention is used as the replacement image of MPEG4.
Fig. 8 is the schematic diagram of replacement image processing method of the visual telephone terminal of the embodiment of the invention.
Reference numeral
10,20... visual telephone terminal 11... camera
12... image compression unit 13... transmission ends
21... receiving terminal 22... image-decoding portion
23... picture display part 30,60,70... change control
31... Video Decoder 32... video encoder
60,70... replacement image converter section 61...MPEG4 decoder
62...H.263 encoder 63,73...MPEG4 file generator
71...H.263 decoder 73...MPEG4 encoder
Embodiment
Describe with reference to the accompanying drawings.
With reference to Fig. 2, by transmission can phonovision terminating machine 10 and recipient's visual telephone terminal 20 constitute, transmission can be provided with camera 11, image compression unit 12, transmission ends 12, conversion control 30 by phonovision terminating machine 10; Recipient's visual telephone terminal 20 is provided with receiving terminal 21, image-decoding portion 22, picture display part 23.
In addition, also be provided with the compressing image stream binding of image stream that above-mentioned conversion control 30 is finally encoded and original replacement image, as the file generator (File maker) of a transformat compressed file generation.
Replacement image processing unit to visual telephone terminal of the present invention describes with reference to the accompanying drawings.
With reference to Fig. 2, when visual telephone terminal 10 carries out conversation on video telephone, not the image that shows oneself, but the replacement image (comprising static images and moving image) that transmission sets in advance.At this moment, image as an alternative according to the standard mode of video telephone, uses the compression transmission means, as H.261, H.263, the image of (H.26L), MPEG4 compressed format H.264.But the compression transmission means of using because of this video telephone sets in advance, just can not be as the replacement image use of video telephone to image that should mode.
Here, H.261 the video multimedia digital signal codec category of using as the video telephone standard have, H.263, MPEG-4, H.264 wait, H.263 present most video telephone uses or MPEG-4.In addition, H.264 develop in addition recently and go on the market.The present invention can select to use from the replacement image of a plurality of codecs of setting in advance, so that make the use of this codec unrestricted.
In addition,, also can be suitable for replacement image of the present invention, so that satisfy the standard (H.323,3G-324M, SIP) that gives even recipient's visual telephone terminal is not known the information of replacement image or safe mode and so on.
All codecs that the present invention supports visual telephone terminal are made multiple replacement image stream respectively.Such as, H.263 replacement image be made as flow with the MPEG4 image.
30 pairs of the above-mentioned conversion controls image stream that uses of image as an alternative carry out transform coding, are converted to different compressed format.Transform coding be between different image compressors, the transmission image of Code And Decode video selectively.
That is, conversion control 30 is converted to image format in advance by the compressed format that the compressed format changing unit will offer receiving terminal 21 grades.Such as, H.263 the image circulation is changed to MPEG4 image stream, or the circulation of MPEG4 image is changed to H.263 image stream.
To this, transmission can 10 pairs of supports of phonovision terminating machine all codecs (CODEC) make replacement image with image stream respectively, when reality connects video telephone, will be applicable to that the CODEC image stream that the other side's visual telephone terminal 20 uses transmits when replacement image is set.
If the replacement image in the video telephone is set, will transmit the CODEC image stream that the other side's visual telephone terminal in the image stream of storing in advance with multiple compress mode is supported.
At this moment, connect by video telephone, H.26L the image compress mode that can know the other side's visual telephone terminal is to use, MPEG4 or other compress mode.The method of the compress mode of identification the other side visual telephone terminal is, give be used for H.324 (PSTN) of video telephone standard and H.323 and SIP (VoIP) and 3G-324M (3G Mobile Network) wait the compression CODEC of transmission mandatory (pressure) supports, the compression CODEC that can have selection (optional) property ground to support, and the capability (receiving ability) between the other side, promptly can obtain CODEC that the other side supports and whether reach the relevant definition such as exchanged form of information that communicate with which kind of CODEC, can determine the CODEC of distant terminal machine thus with compatibility between own support CODEC.
For making replacement image, the 1st replacement image stream of the compress mode compression that will support with terminating machine (or original compressing image stream) and change with the 2nd replacement image stream (or the image of transform coding stream) that 30 pairs of above-mentioned the 1st replacement image streams of conversion control carry out transform coding, and 2 replacement image streams are tied to a stored in file format.
At this moment, recipient's visual telephone terminal 20 receives the replacement image stream that transmission can phonovision terminating machine 10 transmits from receiving terminal 31, utilizes the CODEC of oneself to decode in image-decoding portion 32, and replacement image is presented at picture display part 33.
Fig. 3 is the pie graph of conversion control 30 of the present invention.
With reference to Fig. 3, the conversion control is made of Video Decoder 31 and video encoder 32, the image stream (video stream) of above-mentioned Video Decoder 31 decoding the 1st codecs (Codec1), video encoder 32 is the image stream of the 2nd codec (Codec2) with the image stream encryption of the 1st codec of above-mentioned decoding.Wherein, above-mentioned Video Decoder 31 is partial functions of the 1st codec, and video encoder is the partial function of the 2nd codec.
In addition, if in the time of will using other compress mode, the image stream of video decoder decodes the 2nd codec that also can the 2nd codec, and be the image stream of the 1st codec with the image stream encryption of its decoding.
Such as, bit stream H.263 is corrected as the bit stream of MPEG4, the Video Decoder 31 that just will change control constitutes with decoder H.263, and video encoder 32 is constituted with mpeg encoder, can obtain MPEG4 image stream.
Like this, for constitute and the irrelevant replacement image of compress mode the conversion operations that the image that must utilize conversion control 30 to carry out compressing with different compress modes flows at visual telephone terminal.
In addition, utilize with the image stream of different compress mode compressions and make the replacement image file, for making the replacement image file, the image stream of the codec of terminating machine support and the image stream that carries out transform coding need be tied to a file, as be made as the MPEG4 file format.
Fig. 4 is the summary pie graph of general MPEG4 file format.As shown in Figure 4, MPEG4 file format 40 is additional header information 41 at first, inserts video data stream 42 and audio data stream 43 then, after the data flow, has fileinfo- ATOM information 44,45,46 to insert.That insert at first in the ATOM information is MooV ATOM44, and it comprises the information that the basic item of file is relevant.In addition, also have video track ATOM45 and audio frequency track ATOM46 to insert, above-mentioned video and audio frequency track ATOM45,46 are respectively equipped with the video information relevant with audio stream of compression.Therefore, the audio/video stream file that will combine with a MPEG4 file storage Voice ﹠ Video.
The objective of the invention is to the transmission of the replacement image of storage in advance when video telephone uses.That is, video telephone in use, the feature of replacement image is voice, therefore the voice that receiving terminal when promptly audio frequency belongs to telephone relation and transmission ends exchange mutually, need not the audio frequency track of transformat.So, the non-existent file format of audio frequency track in will transmission replacement image transformat.
Give an example, the audio frequency track of MPEG4 file will be eliminated its audio frequency track because of there is no need when replacement image is stored, and the different images compressive flow that carries out transform coding by the conversion control is inserted into audio frequency track field.To this, describe with reference to Fig. 5.
Fig. 5 is the format chart with the MPEG4 file of the replacement image stream formation of the specific embodiment of the invention.
With reference to Fig. 5, MPEG4 file format 50 successively has head 51 and the 1st video flowing 52 and the 2nd video flowing 53 to insert, and then, also will insert MooV ATOM54, and insert the 1st video track ATOM55 and the 2nd video track ATOM56.That is, the 1st and the 2nd video track ATOM55, the 56th, substituting before this, audio frequency track ATOM inserts and constitutes.Therefore, with two streams, the image flow point of promptly original compressing image stream and transform coding is not inserted into track separately, and these is generated as a MPEG4 file format 50, image file storage as an alternative.
Therefore, can determine the image compress mode of use when video telephone connects, if replacement image is suitable for, just from the 1st video track or the 2nd video track, the codec that transmission distant terminal machine is supported promptly uses the replacement image stream that is suitable for the video telephone compress mode.
At this moment, when giving receiving side terminal machine transmission replacement image, two streams can be inserted into the MPEG4 file system respectively according to track, form a file, therefore only header information is decoded, also can detect the H.263 position or the MPEG4 image stream position of image stream.
If used MPEG4 when carrying out conversation on video telephone, just detect the track information that has MPEG4 stream from the replacement image file of making in advance after, give the distant terminal machine with the MPEG4 stream real-time Transmission of above-mentioned storage.If will be from the image of the camera of the terminating machine input stream of image transfer encoding as an alternative, the CODEC mutual because of terminating machine be not suitable for, and can not form the conversation on video telephone of replacement image.
Fig. 6 and Fig. 7 are the integration pie graphs that generates the replacement image file of the embodiment of the invention.
Fig. 6 is that the compress mode when visual telephone terminal is MPEG4, and when H.263 using replacement image, conversion control 60 is with the replacement image of MPEG4 decoder decode boil down to MPEG4 document flow, with encoder 62 codings H.263, generates H.263 document flow thus again.In addition, MPEG4 file generator 63 will be provided with above-mentioned MPEG4 document flow and H.263 the selectivity replacement image stream of document flow generate the replacement image file of MPEG4 file format.Such replacement image file storage is in internal memory, and the replacement image that can be used for all video-phone systems is repeatedly used.
Therefore, when connecting video telephone in the MPEG4 mode, if the user is provided with replacement image, the H.263 image flow transmission that just reads in the above-mentioned replacement image file is given the other side's visual telephone terminal, can utilize the conversation on video telephone of replacement image with this.
Like this, replacement image generation method of the present invention is, the replacement image file that uses when moving video telephone for making, if the user selects the replacement image of specific format, then above-mentioned selected replacement image is encoded to the 1st compressing image stream that visual telephone terminal is supported, with above-mentioned selected replacement image transform coding is the 2nd compressing image stream that visual telephone terminal is supported, above-mentioned the 1st compressing image stream and the 2nd compressing image stream are tied to the MPEG4 file format, generate and storage as a replacement image file.
The present invention is applicable to the transform coding that is intended to make in advance replacement image, promptly is not subjected to H.263 or all images (static images, moving image etc.) of file format such as MPEG4 CODEC restriction.
Such as, the video CODEC of current terminating machine support MPEG4 and H.263 two kinds are arranged, the method for static images (JPEG, JPG, BMP etc.) when being made as replacement image is as follows.
If static images is a jpeg image, then jpeg image is decoded by jpeg decoder, and decoded image is encoded by encoder H.263.In addition, jpeg image is also encoded by the MPEG4 encoder.With utilizing the image stream (the 2nd compressing image stream) of above-mentioned H.263 coding and utilizing the image stream (the 1st compressing image stream) of MPEG4 encoder encodes to be tied to the MPEG4 file format, generate the replacement image file.
If will move image as an alternative during making video, the form that uses with regard to the moving image of promising storage is as * .mpeg4 and * .3gp etc.
For example, with the file that stores the * .mpeg4 (MPEG-4file format) that comprises image H.263 or AMR audio frequency as an alternative image use,
After just only extracting H.263 bit stream, utilize H.263 decoder to decode original H.263 bit stream, will encode with the MPEG-4 encoder the fluent of its decoding from the MPEG4 file format.Stream and original H.263 bit stream of the above-mentioned mpeg encoded made like this are tied to a MPEG-4 file format, are made into a replacement image file.
Here, H.263 bit stream utilizes MPEG-4 file format parser (Parser), from a MPEG-4 file format separates bitstream.
In addition, H.264 being example, with decoder H.264-＞the MPEG-4 encoder encodes, and will utilize the stream of MPEG-4 encoder encodes and utilize H.263 that the stream of encoder encodes is tied to the MPEG4 file format, generates a replacement image file with this.
Other example, suppose the visual telephone terminal support H.263, two CODEC H.264, with the rest image is example, by jpeg file form (* .jpg)-＞jpeg decoder-＞H.263 encoder is encoded, above-mentioned jpeg image is utilized after H.264 encoder is encoded, the stream of encoder encodes is tied to MPEG-4 file format (* .mp4) with utilizing the stream of encoder encodes H.263 and utilizing H.264, generates a replacement image file.
Therefore, the present invention is that the CODEC with the visual telephone terminal support carries out transform coding, makes the bit stream at different CODEC in advance, and when replacement image was set, transmission was suitable for the bit stream of recipient's video telephone CODEC automatically.In addition, the current file format of generally using not only can be made as the MPEG-4 file format, can also be made as 3gp (3GPP Standard File Format), k3g (domestic standard file format) waits other file format.
With reference to Fig. 7, when the video telephone compress mode of visual telephone terminal for H.263, and when using replacement image with MPEG4, H.263 conversion control 70 will utilize that decoder 71 is decoding compressed to be the replacement image of MPEG4 document flow, encode with MPEG4 encoder 72 again, generate MPEG4 document flow (MPEG4 File stream) with this, MPEG4 file generating unit (MP4 filemaker) 73 generates the video flowing of replacement image selectively that comprises above-mentioned H.263 document flow and above-mentioned MPEG4 document flow, and an image stream in this selectivity replacement image stream will be transferred to recipient's terminating machine.
Here, with reference to Fig. 6 and Fig. 7, conversion control 60,70 is by H.263 encoder/decoder and MPEG4 encoder/decoder constitute, generate the image stream that H.263 (carries out the MPEG4 of transform coding) that comprises MPEG4 (H.263) image stream and carry out transform coding, be applicable to the file of transmission transformat and store image use as an alternative where necessary.
Fig. 8 is the flow chart of the replacement image processing method of visual telephone terminal of the present invention.
With reference to Fig. 8, if there is the visual telephone terminal of transmission side to connect video telephone (S31), the image compress mode (S33) of the relevant receiving side terminal machine of video telephone connected mode is just discerned in terminating machine inside.Such as, the CODEC that discerns recipient's visual telephone terminal is belonged to MPEG-4, still belong to H.26L.
Afterwards, if the user is provided with replacement image, transmission can just be extracted the CODEC stream (S37) that mates with the receiving side terminal machine from the replacement image file of storage in advance by the phonovision terminating machine, is transferred to the recipient, as an alternative image (S35).
As other embodiment, with replacement image during as basic setup, with when the receiving side terminal machine is connected, transmission is equivalent to the replacement image stream that the receiving side terminal machine is supported CODEC, so that can utilize the conversation on video telephone of replacement image.Therefore, transmission side and recipient's visual telephone terminal can become the transfer system of transmission different images compress mode file.
As mentioned above, with reference to the foregoing description, at length be illustrated, but the present invention is not limited to this, in the scope that does not depart from basic fundamental thought of the present invention, the personnel with conventional knowledge of this area can carry out other various change and modifications.The technical scope of this invention is embodied in the claim item, and same range as also should belong to technical scope of the present invention with all interior gaps therewith.
Claims (13)
1, a kind of replacement image processing method of visual telephone terminal is characterized in that, comprises the steps:
For transmission can phonovision terminating machine and the other side's visual telephone terminal step of connecting;
Discern the step of the codec that the other side's visual telephone terminal of above-mentioned connection supports;
When replacement image is set, from the replacement image file of storage in advance, read the bit stream of the codec of the other side's visual telephone terminal that is applicable to above-mentioned identification, be transferred to the step of the other side's visual telephone terminal.
2, the replacement image processing method of visual telephone terminal as claimed in claim 1 is characterized in that,
Described replacement image file stores at least 2 compressing image streams of supporting compressing multimedia digital signal codec respectively.
3, the replacement image processing method of visual telephone terminal as claimed in claim 2 is characterized in that,
Described replacement image file comprises the image stream and the header information of original compressing image stream and its transform coding of each terminating machine support.
4, the replacement image processing method of visual telephone terminal as claimed in claim 1 is characterized in that,
Described replacement image file is with the Standard File Format storage of visual telephone terminal.
5, the replacement image processing method of visual telephone terminal as claimed in claim 4 is characterized in that,
Described replacement image file constitutes with the MPEG4 file format.
6, the replacement image processing method of visual telephone terminal as claimed in claim 3 is characterized in that,
If described original compressing image stream is MPEG4 document flow, the image stream behind the then described transform coding is document flow H.263.
7, the replacement image processing method of visual telephone terminal as claimed in claim 3 is characterized in that,
If described original compressing image stream is document flow H.263, the image stream behind the then described transform coding is MPEG4 document flow.
8, a kind of replacement image generation method of visual telephone terminal is characterized in that, comprises the steps:
For making the replacement image file that will use when video telephone moves, the user selects the step of the replacement image of specific format;
If select above-mentioned replacement image, the replacement image of above-mentioned selection is encoded to the 1st compressing image stream that visual telephone terminal is supported, the replacement image of above-mentioned selection is translated the step that is encoded to the 2nd compressing image stream that visual telephone terminal supports;
Above-mentioned the 1st compressing image stream and the 2nd compressing image stream are tied to the MPEG4 file format, the step that generates a replacement image file and store.
9, a kind of replacement image processing unit of visual telephone terminal is characterized in that, comprises as the lower part:
Compress and decoding device at the compression of image and the image of decoding;
When using video telephone original compressing image stream translation is encoded to the image stream of different compressed formats, so that can support the conversion control of at least 2 image compressing multimedia digital signal codecs;
Generation comprises original compressing image stream and carries out the replacement image file generator of replacement image compressed format files of the image stream of transform coding by above-mentioned conversion control;
Store the internal memory of above-mentioned replacement image compressed format files;
In the conversation on video telephone, when if the user is provided with replacement image, read the replacement image stream that is suitable for the other side's visual telephone terminal codec from above-mentioned replacement image compressed format files, be transferred to the reception/transmitting device of the other side's visual telephone terminal.
10, the replacement image processing unit of visual telephone terminal as claimed in claim 9 is characterized in that,
Described conversion control is provided with the decoder of the above-mentioned original compressing image stream of decoding and the encoder of original compressive flow of the above-mentioned decoding of encoding with different compress modes.
11, the replacement image processing unit of visual telephone terminal as claimed in claim 9 is characterized in that,
Described replacement image file generator is to utilize the MPEG4 file format to produce the replacement image compressed format files, on the video data track of described MPEG4 file format, constitute original compressing image stream, on the voice data track, constitute the image stream of above-mentioned transform coding, and two image stream informations of above-mentioned formation are inserted respectively to relevant track.
12, as the replacement image processing unit of claim 9 or 10 described visual telephone terminals, it is characterized in that,
When described original compressing image stream was MPEG4 document flow, then the image stream of described transform coding was document flow H.263.
13, as the replacement image processing unit of claim 9 or 10 described visual telephone terminals, it is characterized in that,
When described original compressing image stream is H.263 during document flow, then the image stream of described transform coding is MPEG4 document flow.
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| Title |
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| H.263与MPEG-4视频码流相互转换的实现. 郭晓强等.电视技术，第11期. 2003 |
| H.263与MPEG-4视频码流相互转换的实现. 郭晓强等.电视技术，第11期. 2003 * |
| 数字视频格式的转换及转码. 冯传岗.有线电视技术，第20期. 2003 |
| 数字视频格式的转换及转码. 冯传岗.有线电视技术，第20期. 2003 * |
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