Resources Contact Us Home
Spatial compression and decompression for video

Image Number 3 for United States Patent #5675382.

A spatial compression and decompression system for color video data wherein a video stream is generated by a charge-coupled device with red, green and blue pixel elements. In a first compression stage, the 5-bit color data from each element is processed in turn. This step involves reading out from a lookup memory a 3-bit category (or compressed value) and 5-bit output value based on the 5-bit color data, a 5-bit previous value that represents same color data for a neighboring pixel and a 1-bit table select signal that determines in which of two similar tables the lookup is performed. The 3-bit category data for a pixel's three elements are combined and used as a 9-bit index into a Huffman table that performs the second stage of compression. Each Huffman table entry includes a variable-length Huffman code that represents more common categories with fewer bits, which provides additional compression over the first stage. The Huffman table reads out the code of the particular 9-bit category used for the lookup. This code is packed into an output buffer and transmitted to the decompressor that will unpack for display or store the resulting compressed data stream. In the first decompression stage, each Huffman code in the compressed data stream is decoded using no more than two compares and one table lookup into an inverse Huffman decode table. The resulting 9-bit category is used as an index into one of two similar inverse lookup tables, which outputs the appropriate 16-bit uncompressed data value.

  Recently Added Patents
Curved structural part made of composite material and a process for manufacturing such a part
Portion of a display panel with an ambiguous facial expression icon
Portable electronic device housing including hinge
Extreme ultraviolet light source device and method for generating extreme ultraviolet light
Method for production of a thermoelectric apparatus
Semiconductor device and method for fabricating the same
  Randomly Featured Patents
Method for removing a tool from a well
Passage control device for non-contacting data carriers
Method of manufacturing integrated circuit device
Providing data services to telecommunications user terminals
Data storage mechanism and communication mechanism for portable dosimeter
Stack lifting apparatus and method
Food plate
Wire strain relief and conductor retainer construction for telephone blocks
Anti-5T4 antibodies and uses thereof
Double-shouldered welding device for the friction stir welding of parts, and welding method