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Class Information
Number: 382/246
Name: Image analysis > Image compression or coding > Lossless compression > Huffman or variable-length coding
Description: Subject matter in which image data are encoded using a variable length code, such that the most common image data have the shortest codes.

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13

Patent Number Title Of Patent Date Issued
5907635 Picture data decompression apparatus May. 25, 1999
5907637 Method and apparatus for compressing and decompressing data May. 25, 1999
5907330 Reducing power consumption and bus bandwidth requirements in cellular phones and PDAS by using a compressed display cache May. 25, 1999
5905815 Decoding encoded image signals encoded by further transforming transformed DC signals May. 18, 1999
5903677 Image encoding and recording apparatus May. 11, 1999
5901250 Digital coding apparatus and digital coding/decoding apparatus May. 4, 1999
5896465 Reverse prioritized image transmission Apr. 20, 1999
5875266 Image data processing a method and apparatus Feb. 23, 1999
5847776 Method for entropy constrained motion estimation and coding of motion vectors with increased search range Dec. 8, 1998
5848192 Method and apparatus for digital data compression Dec. 8, 1998
5848195 Selection of huffman tables for signal encoding Dec. 8, 1998
5832128 Picture signal encoding and decoding apparatus Nov. 3, 1998
5831872 Method and system for compressing a video signal using dynamic frame recovery Nov. 3, 1998
5828791 Method for storing and playback of fixed videotexts Oct. 27, 1998
5825927 Methods and apparatus for encoding video data in a manner that is well suited for decoding by regular or downconverting decoders Oct. 20, 1998
5825934 Adaptive image coding method and apparatus Oct. 20, 1998
5825830 Method and apparatus for the compression of audio, video or other data Oct. 20, 1998
5822770 Memory interfacing method and circuit of variable length decoder for accessing external memory when empty portion of internal memory exceeds a predetermined level Oct. 13, 1998
5812701 Variable length coding system having a zig-zag memory Sep. 22, 1998
5809565 Method of and device for writing and reading data items in a memory system including a data item memory and a length memory Sep. 15, 1998
5805737 Image signal compressing device Sep. 8, 1998
5805302 Variable length encoding of image data Sep. 8, 1998
5801841 Image signal coding apparatus with switching between variable-length coding and fixed-length coding Sep. 1, 1998
5801840 Apparatus for decoding codes with less memory capacity Sep. 1, 1998
5793897 Adaptive variable-length coding and decoding methods for image data Aug. 11, 1998
5793896 Ordering corrector for variable length codes Aug. 11, 1998
5793898 Data compressing system Aug. 11, 1998
5790265 Image coding/decoding method and apparatus Aug. 4, 1998
5784494 Method and apparatus for prestoring dequantization information for DCT VLC decoding Jul. 21, 1998
5784631 Huffman decoder Jul. 21, 1998
5778096 Decompression of MPEG compressed data in a computer system Jul. 7, 1998
5777749 Method and device for compressing bit-map data Jul. 7, 1998
5764802 Encoding image signals using a blur image Jun. 9, 1998
5764357 Zero-run-length encoder with shift register Jun. 9, 1998
5761345 Image processing apparatus suitable for multistage compression Jun. 2, 1998
5761438 Apparatus for measuring the amount of traffic of a network at a predetermined timing and compressing data in the packet without changing the size of the packet Jun. 2, 1998
5757973 Compression of image data seperated into frequency component data in a two dimensional spatial frequency domain May. 26, 1998
5754696 Apparatus for compression-coding image data and method of the same based on quantification and frequency transform coefficient amplitude reduction May. 19, 1998
5754232 Zig-zag and alternate scan conversion circuit for encoding/decoding videos May. 19, 1998
5751860 Method for compressing and decompressing digital image data May. 12, 1998
5748788 Image processing method and apparatus May. 5, 1998
5748790 Table-driven statistical decoder May. 5, 1998
5748786 Apparatus for compression using reversible embedded wavelets May. 5, 1998
5727091 Video decoder system Mar. 10, 1998
5727090 Method of storing raster image in run lengths havng variable numbers of bytes and medium with raster image thus stored Mar. 10, 1998
5708732 Fast DCT domain downsampling and inverse motion compensation Jan. 13, 1998
5675382 Spatial compression and decompression for video Oct. 7, 1997
5657416 Apparatus for further compressing and recording encoded digital video data streams Aug. 12, 1997
5654806 Code manipulation for a high speed JPEG decoder Aug. 5, 1997
5642437 System decoder circuit with temporary bit storage and method of operation Jun. 24, 1997

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