Image analysis – Histogram processing – For setting a threshold
Patent
1992-05-07
1993-05-04
Razavi, Michael T.
Image analysis
Histogram processing
For setting a threshold
382 27, 382 41, 358160, G06K 936
Patent
active
052088758
ABSTRACT:
A digital picture signal processing apparatus has memories each capable of storing digital words representing respective pixels which, when arranged in a two-dimensional array, make up a picture. A read address generator produces a digital read address identifying the position of a set of the stored words to be read from respective different ones of the memories, the words of the set representing a set of pixels so positioned relative to one another as to constitute at least some of the pixels of a portion of the picture. The read address comprises at least one least significant bit (LSB) for each of the coordinate directions. A digital filter has a number of multipliers equal to the number of words in the set and each being connected to a data bus of a respective memory so as to receive a respective one of the set of words read therefrom, and a plurality of coefficient memories. Each coefficient memory is connected to a respective one of the multipliers and stores all of a plurality of weighting coefficients each appropriate to the position of a respective one of the set of pixels in the picture portion. Each coefficient memory is responsive to the values of the LSBs and to identification of the memory whose data bus is connected to the associated multiplier to supply to that multiplier that one of the coefficients stored therein appropriate to the position in the picture portion of the pixel represented by the word supplied to that multiplier.
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Hedley David J.
Keating Stephen M.
Virtue Peter J.
Frommer William S.
Razavi Michael T.
Sinderbrand Alvin
Sony Corporation
Tung Yon
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