Adaptive type compression method for compressing a color image by imparting predetermined variable-length codes to combinations of quantized values based upon quantized prediction error components
System for re-quantization of coded picture signals Patent #: 4677479
ApplicationNo. 06/932274 filed on 11/19/1986
US Classes:375/240.24, Block coding375/244Differential
ExaminersPrimary: Britton, Howard W.
Attorney, Agent or Firm
International ClassH04N 7/26 (20060101)
Foreign Application Priority Data1985-11-29 JP
AbstractIn an apparatus for coding digital video data in a block format, the dynamic range information is generated from maximum and minimum values of plural picture elements in a block, and the minimum value is subtracted from each of the digital data to generate modified digital video data. A distribution table of the dynamic range information during a predetermined period, such as plural fields, is generated, and the encoding bit number for each block is determined based on the distribution table and the capacity of the transmission line such as a VTR. The modified data is encoded with such encoding bit number and transmitted with a first additional code per block formed of the minimum value and a signal based on the dynamic range information and with a second additional code for the predetermined period.