Patent Number: 6,490,372

Title: Image coding and decoding methods, image coding and decoding apparatuses, and recording media for image coding and decoding programs

Abstract: In an image coding method of the present invention, after a process such as DCT is performed to digital image data, quantization process is performed, and then, to resultant quantized transform coefficients, variable length coding process is performed with reference to a variable length code table showing how variable length codes are allocated, and in a comparison process between an event derived from the quantized transform coefficients and a reference event included in the variable length code table, transformation process is performed to increase a possibility of performing variable length coding with satisfactory coding efficiency.

Inventors: Boon; Choong Seng (Moriguchi, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: G06T 9/00 (20060101); H03M 7/42 (20060101); H04N 7/30 (20060101); H04N 7/26 (20060101); H04N 7/50 (20060101); G06K 009/36 (); G06K 009/46 ()

Expiration Date: 12/03/2019