Image encoding apparatus and image encoding method

Details Image encoding apparatus and image encoding method Image encoding apparatus and image encoding method

2006-08-25

2011-10-25

Pham, Brenda H (Department: 2464)

Image analysis

Image compression or coding

Transform coding

C375S240180

Reexamination Certificate

active

08045815

ABSTRACT:
An image capturing apparatus100first executes JPEG encoding on RAW data. On the basis of the compression ratio of JPEG image data obtained, the image capturing apparatus100selects a Huffman table to encode the RAW data. With the higher compression ratio of the JPEG data obtained, the image capturing apparatus100assumes that the RAW data is image data with a larger number of low frequency components. The image capturing apparatus100thus selects a Huffman table that assigns a particularly short code to a predictive differential value with a smaller absolute value. In contrast, with the lower compression ratio of the JPEG image data obtained, the image capturing apparatus100selects a Huffman table that assigns a code of a relatively equal length to the predictive differential value regardless of its absolute value.

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