Method and circuit for suppressing sequential "zeroes" data
Encoding system capable of accomplishing a high efficiency by anterior and/or posterior processing to quantization
Compression method of halftone image data Patent #: 4922273
ApplicationNo. 564824 filed on 08/09/1990
US Classes:382/239, Adaptive coding (i.e., changes based upon history, activity, busyness, etc.)358/1.9, Attribute control382/250Discrete cosine or sine transform
ExaminersPrimary: Moore, David K.
Assistant: Jung, Yon
Attorney, Agent or Firm
International ClassG06K 009/00
Foreign Application Priority Data1989-08-19 JP
AbstractThis invention relates to a transform coding apparatus where linear transform is performed for input signal series such as image signals, and transform coefficients are quantized from lower frequency components to higher frequency components in the transform region, and then the quantized transform coefficients aare coded and outputted. The quantized transform coefficients being zero are counted, and when the count value exceeds the prescribed threshold value, the quantization is terminated so that high speed in the coding is intended and variation of the code generation rate can be prevented.