IMAGE CODING METHOD, IMAGE DECODING METHOD, IMAGE CODER AND IMAGE DECODER

Japanese Patent JP3967453

B2

PROBLEM TO BE SOLVED: To realize coding processing for noise elimination in image coding processing by a simpler and high speed algorithm and to obtain a decoded image with little deterioration in visual image quality.
SOLUTION: The coder is provided with a block division means 1 that divides image data obtained from an image pickup element into M×N blocks, signal level range calculation means 2, 3 that calculats the maximum value Lmax and the minimum value Lmin of the pixel values in the respective blocks, quantization level calculation means 4, 5, 6 that decide a quantization level of the pixel value from the obtained Lmax and Lmin, a quantization means 7a that quantizes each pixel value in a block from the obtained quantization level, a noise detection means 7b that detects a noise from the quantization value of each pixel value and the Lmax and the Lmin, a noise elimination means 7b that corrects a pixel value of the pixel detected as the noise, and a block coding means 9 that encodes the block after the noise is eliminated.

Kazuto Terada
Shigehiro Matoba

JP7431898A

August 29, 2007

March 23, 1998

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Mitsubishi Electric Corporation

H04N5/21; H04N19/00; H04N19/102; H04N19/126; H04N19/136; H04N19/176; H04N19/196; H04N19/60; H04N19/625; H04N19/80; H04N19/86; (IPC1-7): H04N7/30; //H04N5/21

JP7115569A
JP1200884A
JP4219074A
JP1093963A

Michiteru Soga
Yoshio Kobayashi
Yutaka Ikeya
Hidetoshi Furukawa
Suzuki Kenchi
Masahisa Hase
Tetsuo Kuroiwa

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