Image analysis – Image compression or coding – Quantization
Patent
1996-12-12
1997-09-23
Boudreau, Leo
Image analysis
Image compression or coding
Quantization
382254, 382298, G06K 936, G06K 940
Patent
active
056712960
ABSTRACT:
A first set of input index signals represents a row-column array of quantized pixels; and each input index signal in the first set represents a rectangular non-overlapping quantized pixel group which is aligned to a particular row and a particular column. By repeatedly performing three steps on different pairs of the input index signals in the first set, a second set of index signals is generated wherein a respective index signal exists for each individual pixel in the array and by which the image can be filtered. These three steps are: 1) selecting a pair of input index signals in the first set such that the two quantized pixel groups which the selected index signals represent are adjacent to each other in the array; 2) forming an address signal by combining the two selected input index signals; and 3) reading a memory with the address signal to thereby obtain an output index signal. That output index signal represents an overlapping group of pixels which--a) consist of pixels from the two adjacent quantized pixel groups, and b) have been requantized.
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Call Roger William
Pulsipher Dennis Carl
Boudreau Leo
Fassbender Charles J.
Kahng Anthony H.
Petersen Steven R.
Starr Mark T.
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