Reversible embedded wavelet system implementation

• US 7,289,677 B2
• Filed: 01/08/2003
• Issued: 10/30/2007
• Est. Priority Date: 09/21/1994
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Schwartz, Edward L.
• Primary Examiner(s): Tran; Phuoc
• Application Number:
  US10/339,502
• Publication Number:
  US 20030138157A1
• Time in Patent Office: 1,756 Days
• Field of Search: 382/240, 382/244, 382/248, 375/240.19
• US Class Current: 382/240
• CPC Class Codes: G06F 17/148 Wavelet transforms
• CPC Class Codes: G06K 15/02 using printers
• CPC Class Codes: G06K 15/1865 by compressing the rasterized print data
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
• CPC Class Codes: H04N 19/10 using adaptive coding
• CPC Class Codes: H04N 19/102 characterised by the element, parameter or selection affected or controlled by the adaptive coding
• CPC Class Codes: H04N 19/115 Selection of the code volume for a coding unit prior to coding
• CPC Class Codes: H04N 19/12 Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
• CPC Class Codes: H04N 19/122 Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/129 Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 19/156 Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/167 Position within a video image, e.g. region of interest [ROI]
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/184 : the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/186 : the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/1883 : the unit relating to sub-band structure, e.g. hierarchical level, directional tree, e.g. low-high [LH], high-low [HL], high-high [HH]
• CPC Class Codes: H04N 19/36 : Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
• CPC Class Codes: H04N 19/42 : characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/46 : Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/593 : involving spatial prediction techniques
• CPC Class Codes: H04N 19/60 : using transform coding
• CPC Class Codes: H04N 19/61 : in combination with predictive coding
• CPC Class Codes: H04N 19/635 : characterised by filter definition or implementation details
• CPC Class Codes: H04N 19/647 : using significance based coding, e.g. Embedded Zerotrees of Wavelets [EZW] or Set Partitioning in Hierarchical Trees [SPIHT]
• CPC Class Codes: H04N 19/98 : Adaptive-dynamic-range coding [ADRC]
• CPC Class Codes: H04N 21/6377 : directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/658 : Transmission by the client directed to the server

Abstract

A method and apparatus for performing compression and/or decompression is described. In one embodiment, the present invention comprises a system having a buffer, a wavelet transform unit, and a coder. The wavelet transform unit has an input coupled to the buffer to perform a wavelet transform on pixels stored therein and to generate coefficients at an output. The coder is coupled to the wavelet transform unit to code the transformed pixels received from the buffer.

Claims

1. A method comprising:

ordering a plurality of wavelet trees into an order;

transforming the plurality of wavelet trees into a plurality of coefficients using a reversible wavelet filter;

generating an embedded codestream using the plurality of coefficients; and

binary entropy coding the embedded codestream to generate a compressed data stream.

2. The method defined in claim 1 wherein the order comprises a long seam transform order.

3. The method defined in claim 2 wherein the long seam transform order comprises wavelet trees being ordered horizontally in row across the width of an image and wrapping around to a left edge of a next row in the image when wavelet trees have filled a row of the image preceding the next row.

4. The method defined in claim 1 wherein the order comprises a short seam transform order.

5. The method defined in claim 4 wherein the short seam transform order comprises wavelet trees being ordered vertically down a column down across the length of an image and wrapping up to a top edge of a next column in the image when wavelet trees have filled a column of the image preceding the next column.

6. The method defined in claim 4 wherein the short seam transform order comprises wavelet trees being ordered vertically down in sets of columns down across the length of an image and wrapping up to a top edge of a next set of columns in the image when wavelet trees have filled the current set of columns of the image preceding the next column.

7. The method defined in claim 6 wherein the set of columns comprises two columns.

8. The method defined in claim 1 wherein each of the plurality of wavelet trees comprises a 16×

16 block of pixels.

9. An apparatus comprising:

means for ordering a plurality of wavelet trees into an order;

means for transforming the plurality of wavelet trees into a plurality of coefficients using a reversible wavelet filter;

means for generating an embedded codestream using the plurality of coefficients; and

means for binary entropy coding the embedded codestream to generate a compressed data stream.

10. The apparatus defined in claim 9 wherein the order comprises a long seam transform order.

11. The apparatus defined in claim 10 wherein the long seam transform order comprises wavelet trees being ordered horizontally in row across the width of an image and wrapping around to a left edge of a next row in the image when wavelet trees have filled a row of the image preceding the next row.

12. The apparatus defined in claim 9 wherein the order comprises a short seam transform order.

13. The apparatus defined in claim 12 wherein the short seam transform order comprises wavelet trees being ordered vertically down a column down across the length of an image and wrapping up to a top edge of a next column in the image when wavelet trees have filled a column of the image preceding the next column.

14. The method defined in claim 12 wherein the short seam transform order comprises wavelet trees being ordered vertically down in sets of columns down across the length of an image and wrapping up to a top edge of a next set of columns in the image when wavelet trees have filled the current set of columns of the image preceding the next column.

15. The method defined in claim 14 wherein the set of columns comprises two columns.

16. The method defined in claim 9 wherein each of the plurality of wavelet trees comprises a 16×

16 block of pixels.

17. An article of manufacture having one or more computer-readable storage media storing instructions thereon which, when executed by a system, cause the system to decode information in a codestream by:

ordering a plurality of wavelet trees into an order;

transforming the plurality of wavelet trees into a plurality of coefficients using a reversible wavelet filter;

generating an embedded codestream using the plurality of coefficients; and

binary entropy coding the embedded codestream to generate a compressed data stream.

18. The article of manufacture defined in claim 17 wherein the order comprises a long seam transform order.

19. The article of manufacture defined in claim 17 wherein the order comprises a short seam transform order.