Transform coding apparatus
Patent 5086488 Issued on February 4, 1992. Estimated Expiration Date: 
August 9, 2010. 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.
August 9, 2010. 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 ReferencesMethod 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 InventorsApplicationNo. 564824 filed on 08/09/1990US Classes:382/239, Adaptive coding (i.e., changes based upon history, activity, busyness, etc.)358/1.9, Attribute control382/250Discrete cosine or sine transformExaminersPrimary: Moore, David K.Assistant: Jung, Yon Attorney, Agent or FirmInternational ClassG06K 009/00Foreign Application Priority Data1989-08-19 JPAbstractThis 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. | |
