Image coding apparatus for coding an image of a component signal

Details Image coding apparatus for coding an image of a component signal Image coding apparatus for coding an image of a component signal

1997-07-14

2000-05-02

Bella, Matthew C.

Image analysis

Image compression or coding

Quantization

382239, 348405, G06K 936, G06K 946

Patent

active

060582170

ABSTRACT:
In an image coding apparatus, an image signal constituted of R, G, B components is coded in a high efficiency. The image coding apparatus is arranged by: block making means for subdividing the image to make a predetermined number of image blocks; maximum/minimum value detecting means for detecting a maximum value and a minimum value of each of the plural components which constitute the component signals in pixels within the blocks; dynamic range calculating means for calculating a dynamic range equal to a difference value between the maximum value and the minimum value of each of the plural components; block dynamic range detecting means for detecting a block dynamic range equal to a maximum value thereof from the dynamic range of each of the respective plural components; quantizing step width determining means for determining a quantizing step width used to quantize each of the plural components based upon the block dynamic range; and quantizing means for quantizing each of the plural components in accordance with the quantizing step width determined by the quantizing step width determining means.

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patent: 5706009 (1998-01-01), Kondo et al.
patent: 5734433 (1998-03-01), Kondo et al.
patent: 5748791 (1998-05-01), Park
patent: 5748793 (1998-05-01), Sanpei

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