Picture signal coder
Compression of gray scale imagery to less than one bit per picture element
Interframe coding apparatus
Frame-to-frame coding system
Method and system for bandwidth-compressed transmission of a video signal in the NTSC system
Serial digital bit stream code detector
Video signal encoding
Regenerative decoding of binary data using minimum redundancy codes
Predictive encoder with a non-linear quantizing characteristic Patent #: 4179710
ApplicationNo. 05/969991 filed on 12/15/1978
US Classes:375/240.06, Feed forward341/51, Adaptive coding341/61, Data rate conversion375/241, Pulse code modulation375/250, Redundancy removal382/232IMAGE COMPRESSION OR CODING
ExaminersPrimary: Moffitt, James W.
Assistant: Psitos, Aristotelis M.
Attorney, Agent or Firm
International ClassesG06F 7/78 (20060101)
G06T 9/00 (20060101)
H04N 7/26 (20060101)
H04N 11/04 (20060101)
H04N 7/32 (20060101)
H04N 7/30 (20060101)
G06F 7/76 (20060101)
AbstractA digital video compression system and its methods for compressing digitalized video signals in real time at rates up to NTSC color broadcast rates are disclosed. The system compressor receives digitalized video frames divided into subframes, performs in a single pass a spatial domain to transform domain transformation in two dimensions of the picture elements of each subframe, normalizes the resultant coefficients by a normalization factor having a predetermined compression ratio component and an adaptive rate buffer capacity control feedback component, to provide compression, encodes the coefficients and stores them in a first rate buffer memory asynchronously at a high data transfer rate from which they are put out at a slower, synchronous rate. The compressor adaptively determines the rate buffer capacity control feedback component in relation to instantaneous data content of the rate buffer memory in relation to its capacity, and it controls the absolute quantity of data resulting from the normalization step so that the buffer memory is never completely emptied and never completely filled. In expansion, the system essentially mirrors the steps performed during compression. An efficient, high speed decoder forms an important aspect of the present invention. The compression system forms an important element of a disclosed color broadcast compression system.