WO1995008244B1 - Video compression using an iterative error data coding method - Google Patents
Video compression using an iterative error data coding methodInfo
- Publication number
- WO1995008244B1 WO1995008244B1 PCT/US1994/010281 US9410281W WO9508244B1 WO 1995008244 B1 WO1995008244 B1 WO 1995008244B1 US 9410281 W US9410281 W US 9410281W WO 9508244 B1 WO9508244 B1 WO 9508244B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- compressed
- image
- signal
- error
- Prior art date
Links
- 238000007906 compression Methods 0.000 title claims abstract 30
- 230000005540 biological transmission Effects 0.000 claims abstract 4
- 238000000034 method Methods 0.000 claims abstract 3
- 230000000875 corresponding Effects 0.000 claims 15
- 239000002131 composite material Substances 0.000 claims 6
- 230000001131 transforming Effects 0.000 claims 1
- 230000003044 adaptive Effects 0.000 abstract 1
Abstract
An adaptive system (10) and method for data storage and communication is primarily used for the storage and transmission of large volumes of data, especially video data, over band-limited communication channels. The video coder (200) of the system (10) uses a prediction video signal which is subtracted from the input image to define a processing region in which image blocks of predetermined dimensions have large prediction error. The prediction image is successively improved by iteratively processing large error image blocks until the error is reduced below a predetermined threshold. At different processing iterations and image blocks, different compression techniques can be used to improve the overall system efficiency.
Claims
1. An apparatus for compression of data from a video signal source comprising:
means for compressing an input image from the video signal source in a first data path to provide a first
compressed image signal;
first interpolating means for interpolating a prediction image from said first compressed image signal;
means for comparing the prediction image to the input image;
evaluating means for evaluating the input from said means for comparing with respect to a predetermined threshold of an error measure;
means for forming image error areas where the error measure is evaluated to be larger than the predetermined threshold;
means for compressing said image error areas in at least one alternate data path to provide at least one compressed area correction signal; and
means for combining said first compressed image signal and said at least one compressed area correction signal to provide a composite compressed image signal.
2. The compression apparatus of claim 1 further
comprising means for dividing the prediction image into image areas of predetermined dimensions, the image areas being supplied to the comparing means.
3. The compression apparatus of claim 2 wherein the error measure is evaluated for each image area; the apparatus
further comprising:
means for monitoring the output of the evaluating means, wherein the set of image areas having an error measure larger than the predetermined threshold is defined as a processing region, said processing region being supplied to the means for forming.
4. The compression apparatus of claim 3 further
comprising:
second interpolating means for interpolating a prediction processing region from said at least one compressed area correction signal and said first compressed image signal;
means receiving input from said second interpolating means for supplying said prediction processing region to the comparing means.
5. The compression apparatus of claim 4 wherein
interpolation of said first compressed image signal and said at least one compressed area correction signal is done within said processing region.
6. The compression apparatus of claim 4 further
comprising:
means for receiving a digitized video signal containing pixel data defining a sequence of video frames;
means for predicting a current video frame from pixel data obtained from at least one previous video frame;
means for subtracting the predicted pixel data from the corresponding current video frame pixel data to obtain prediction error pixel data;
means for presenting said prediction error pixel data as an input image to said means for compressing an input image in said first data path.
7. The compression apparatus of claim 6 further
comprising means for formatting the video signal from said sequence of video frames.
8. The compression apparatus of claim 7 wherein the means for formatting are capable of storing the video signal from said sequence of video frames into either a frame format or a field format.
9. The compression apparatus of claim 8 wherein at least one data path is adapted to process video signals in said frame format and at least one data path is adapted to process video signals in said field format.
10. The compression apparatus of claim 6 further
comprising:
means for encoding at least one image area of said first compressed image signal with motion vector data generated by said means for predicting.
11. The compression apparatus of claim 10 further
comprising means for encoding compressed image signals and compressed area correction signals with data indicative of the path in which such compressed image signals and compressed area correction signals originated.
12. The compression apparatus of claim 11 further comprising means for providing from said composite compressed image signal a compressed digital video data stream.
13. The compression apparatus of claim 3 wherein each image area has a rectangular shape and has horizontal and vertical dimensions selected to be powers of two.
14. The compression apparatus of claim 13 wherein the horizontal and vertical dimensions are identical and are selected to be equal to four.
15. The compression apparatus of claim 4 further
comprising:
control means for monitoring the amount of data of the composite compressed signal; and
threshold computing means responsive to said control means for adaptively computing the predetermined threshold supplied to the evaluating means to adjust desired compression rate of the input image.
16. The compression apparatus of claim 3 wherein said means for forming comprises means for combining image areas of said processing region into error areas shaped to completely cover said processing region.
17. The compression apparatus of claim 16 wherein said means for compressing image error areas are adapted for parallel processing of error areas in alternate data paths.
18. The compression apparatus of claim 3 wherein the error measure in an image area is computed as the average absolute error of differences between pixel values of an image area of the input image and the pixel values of corresponding image area of the prediction image interpolated from the first compressed image signal.
19. The compression apparatus of claim 3 wherein the error measure in an individual image area is computed as the means-squared error of the differences between pixel values of an image area of the input image and the pixel values of corresponding image area of the prediction image interpolated from the first compressed image signal.
20. A receiver for decoding the compressed digital video data stream from the apparatus of claim 12 comprising:
means for detecting encoding data from said compressed image signals and compressed area correction signals to identify the data path from which such signals originated; processing means for processing each of said compressed image signals and compressed area correction signals in a corresponding decompression data path identified in said means for detecting.
21. In an image transmission and storage system a decoder apparatus comprising:
means for receiving compressed digital video signals transmitted in blocks of pixel data compressed in a first data path and correction blocks of pixel data compressed in at least one alternate data path;
determining means coupled to said means for receiving to determine for each of the transmitted blocks of pixel data whether said first data path or said at least one alternate data path was used;
decoding means responsive to said determining means for decoding the received blocks of pixel data in a decompression path corresponding to the determined compression path;
means responsive to said decoding means for combining decoded blocks of pixel data to recover an uncompressed video signal/ wherein decoded blocks of pixel data corresponding to said first data path are used to recover uncompressed video signal of a full size video image, while decoded correction blocks of pixel data corresponding to said at least one alternate data path are used to recover an additional video signal corresponding to select image areas of said full size video image.
22. The decoder apparatus of claim 21 further
comprising:
means for retrieving motion vector data attached to received blocks of pixel data representing a current video frame;
means for storing data representing a previous video frame;
means for computing prediction signals from the retrieved motion vector data and the stored data; and
means for adding said prediction signals to the received blocks for the current video frame.
23. An image transmission and storage system in
accordance with claim 21 wherein each data compression path and corresponding decompression path uses a separate algorithm for compression and decompression of the image data blocks.
24. An image transmission and storage system in
accordance with claim 21 wherein at least one compressed signal comprises an array of transform coefficients and the corresponding decompression path comprises means for inverse transforming said transform coefficients.
25. The system of claim 23 wherein the compression algorithm used is a two-dimensional discrete cosine transform, and the decompression algorithm is a two-dimensional inverse discrete cosine transform.
26. The system of claim 24 wherein individual
compression and decompression paths differ in the size of the processed data blocks.
27. A method for optimizing the compression of blocks of digital data comprising the steps of:
a} compressing the digital data blocks in a first data path to provide a first compressed signal;
b) evaluating errors in the compressed signal with respect to a predetermined threshold;
c) forming error data blocks corresponding to data blocks with an error evaluated to be larger than the predetermined threshold;
d) compressing said error data blocks in at least one alternate data path to provide a compressed correction signal; e) combining said first compressed signal and said compressed correction signal to provide a composite compressed signal;
f) performing steps b through e of the method until no data block of the composite compressed signal is evaluated to have an error signal larger than the predetermined threshold.
28. The method of claim 27 wherein the step of forming error data blocks comprises the step of combining data blocks into error data blocks to completely cover the region where the error is evaluated to be larger than the predetermined threshold.
29. The method of claim 27 further comprising the step of encoding said first compressed signal and each compressed error signal with data indicative of the corresponding data path in which said compressed signal and each compressed correction signals originated.
30. A method for decoding the composite compressed signal of claim 29 comprising the steps of:
a) detecting encoding data from said first compressed signal and each compressed correction signal to identify the corresponding data path from which such signals originated; b) processing, in response to the detected encoding data, said first compressed signal and each compressed correction signal in a decompression data path corresponding to the identified data path from which such signals originated.
31. The method of claim 30 wherein each data compression path and corresponding decompression path uses a separate algorithm for compression and decompression of the data blocks.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94927404A EP0719489A4 (en) | 1993-09-14 | 1994-09-13 | Video compression using an iterative error data coding method |
| AU76861/94A AU703576B2 (en) | 1993-09-14 | 1994-09-13 | Video compression using an iterative error data coding method |
| CA002171727A CA2171727C (en) | 1993-09-14 | 1994-09-13 | Video compression using an iterative error data coding method |
| JP7509296A JPH09505698A (en) | 1993-09-14 | 1994-09-13 | Video compression using iterative error data coding method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US121,828 | 1993-09-14 | ||
| US08/121,828 US5610657A (en) | 1993-09-14 | 1993-09-14 | Video compression using an iterative error data coding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1995008244A1 WO1995008244A1 (en) | 1995-03-23 |
| WO1995008244B1 true WO1995008244B1 (en) | 1995-04-13 |
Family
ID=22399060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/010281 WO1995008244A1 (en) | 1993-09-14 | 1994-09-13 | Video compression using an iterative error data coding method |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US5610657A (en) |
| EP (1) | EP0719489A4 (en) |
| JP (1) | JPH09505698A (en) |
| CN (1) | CN1112045C (en) |
| AU (1) | AU703576B2 (en) |
| CA (1) | CA2171727C (en) |
| SG (1) | SG47746A1 (en) |
| WO (1) | WO1995008244A1 (en) |
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- 1993-09-14 US US08/121,828 patent/US5610657A/en not_active Expired - Fee Related
-
1994
- 1994-09-13 EP EP94927404A patent/EP0719489A4/en not_active Withdrawn
- 1994-09-13 JP JP7509296A patent/JPH09505698A/en active Pending
- 1994-09-13 CN CN94193399A patent/CN1112045C/en not_active Expired - Fee Related
- 1994-09-13 WO PCT/US1994/010281 patent/WO1995008244A1/en not_active Application Discontinuation
- 1994-09-13 AU AU76861/94A patent/AU703576B2/en not_active Ceased
- 1994-09-13 CA CA002171727A patent/CA2171727C/en not_active Expired - Lifetime
- 1994-09-13 SG SG1996004153A patent/SG47746A1/en unknown
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1997
- 1997-07-22 US US08/903,394 patent/US5812195A/en not_active Expired - Fee Related
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