Encoding device and encoding method for image data

Abstract

Abstract PURPOSE:To facilitate coding in such a manner that a code quantity is confined within the specified code quantity within the specified processing time without impairing image quality by providing code quantity calculating means, reference code determining means, code quantity allotting means, and variable length encoding discontinuing means for respective blocks. CONSTITUTION:The statistical processing to obtain the code quantity for each of the respective blocks is executed by quantization 6 at an initially provisionally determined quantization width 12 and variable length encoding 8. The code quantity for each of the respective blocks determined by this statistical processing, the optimum quantization width 12 suitable from the target value of the total code quantity per image, and the allotted code quantity 20 for each of the respective blocks are then determined. The code quantity of each block by each color component is calculated in the variable length encoding calculating means 14. The target value of the total code quantity is proportionally distributed and the reference code quantity of each block by each color component is determined in the determining means 20. The allotting means 20 discontinues the variable length encoding so as not to exceed the allotted code quantity at the time of encoding processing. The encoding processing is so executed that the code quantity is confined within the specified code quantity in the specified processing time without impairing the image quality in this way.

Inventors

• 👤 Chihiro Nakagawa
• 👤 千尋 中川

Bibliographic Details