Patent Number: 6,167,157

Title: Method of reducing quantization noise generated during a decoding process of image data and device for decoding image data

Abstract: A device for decoding coded image data divided into a plurality of blocks so as to generate decoded image data by applying an inverse orthogonal transformation to each block of the plurality of blocks includes a quantization-information detecting unit detecting block-quantization-step-size information indicative of quantization step sizes used for the plurality of blocks. The device also includes a variable-gain-low-pass filter reducing high frequency components of the decoded image data in a predetermined proximity of borders of the plurality of blocks based on the block-quantization-step-size information, the high frequency components having frequencies higher than a predetermined frequency.

Inventors: Sugahara; Takayuki (Kanagawa-ken, JP)

Assignee: Victor Company of Japan, Ltd.

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

Expiration Date: 12/26/2017