Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Reexamination Certificate
2005-05-24
2005-05-24
Dastouri, Mehrdad (Department: 2623)
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
C382S300000, C358S003200
Reexamination Certificate
active
06898329
ABSTRACT:
In a digital camera, a CPU divides a multi-valued image into blocks and selects object blocks, which are to be the object of processing. A CCD outputs luminance values of the multi-valued image. A low luminance threshold value setter sets low luminance threshold values on the basis of mean luminance values of blocks adjacent to the object block. A mean luminance value calculator calculates mean luminance values using luminance values from which luminance values that do not reach the low luminance threshold value in a block have been removed. A binarization threshold value setting circuit sets a binarization threshold value of the block based on the mean luminance values. A binarizer then binarizes the multi-valued image in the block on the basis of the binarization threshold values.
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Dastouri Mehrdad
Ricoh & Company, Ltd.
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