System for compression and decompression of video data using discrete cosine transform and coding techniques
December 1, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital video compression system and methods utilizing scene adaptive coding with rate buffer feedback Method and apparatus for digital Huffman encoding Data decompression apparatus and method Entropy-coding system Image signal compression encoding apparatus and image signal expansion reproducing apparatus Moving image signal encoding apparatus and decoding apparatus Color image data compressing apparatus and method Patent #: 5162898 InventorsApplicationNo. 985092 filed on 12/01/1992US Classes:708/402, Discrete Cosine Transform (i.e., DCT)358/426.13, Combined with lossless coding technique (e.g., fixed or variable run-length coding)358/426.14, Combined with lossy coding technique (e.g., coding of quantized transform coefficients)708/203, Compression/decompression708/401MultidimensionalExaminersPrimary: Nguyen, HoangAttorney, Agent or FirmInternational ClassesG06F 007/38H04N 011/00 AbstractA digital video compression system and an apparatus implementing this system are disclosed. Specifically, matrices of pixels in the RGB signal format are converted into YUV representation, including a step of selectively sampling the chrominance components. The signals are then subjected to a discrete cosine transform (DCT). A circuitry implementing the DCT in a pipelined architecture is provided. A quantization step eliminates DCT coefficients having amplitude below a set of preset thresholds. The video signal is further compressed by coding the elements of the quantized matrices in a zig-zag manner. This representation is further compressed by Huffman codes. Decompression of the signal is substantially the reverse of compression steps. The inverse discrete cosine transform (IDCT) may be implemented by the DCT circuit. Circuits for implementing RGB to YUV conversion, DCT, quantization, coding and their decompression counterparts are disclosed. The circuits may be implemented in the form an integrated circuit chip.Other References
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