Image processing method and apparatus which expand a pixel into

Details Image processing method and apparatus which expand a pixel into Image processing method and apparatus which expand a pixel into

1996-07-02

1998-03-17

Boudreau, Leo

Image analysis

Histogram processing

With a gray-level transformation

382237, G06K 900

Patent

active

057296251

ABSTRACT:
An image processing apparatus converts image information each pixel of which has n gray levels into image information with an increased number of pixels each having m gray levels so that one pixel of the original image information is expanded to A.times.B pixels in the converted image information (where n and m are integers which satisfy the condition n>m.gtoreq.2). The image processing apparatus includes a scalar quantization unit for scalar-quantizing the image information with n gray levels into image information with p gray levels wherein the scalar quantization is performed in units of pixels, with n>p>m; an addition coding unit and a vector coding unit for coding the image information with p gray levels supplied by the scalar quantization unit into a compressed code having a value less than p to the power of C wherein the coding is performed in units of C pixels (where C.gtoreq.2); a decoding unit for decoding the code supplied by the coding units, the decoding being performed in units of C pixels; and a gradation pattern producing unit for producing a pixel arrangement pattern representing gradation on the basis of the decoded signal supplied by the decoding means wherein each pixel of the pixel arrangement pattern has m gray levels.

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R. Floyd and L. Steinberg, "An Adaptive Algorithm for Spatial Gray Scale", SID75 Digest, pp. 36-37. No Place of Publication. No Date.

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