Patent ID: 6674444
Filing Date: 2004-01-06
Classification: G06T,H04N

Abstract:
An image processing apparatus comprising:a histogram generator for generating a histogram by dividing pixels constituting multivalued image data into levels; a multivalued image processor for processing the multivalued image data using the histogram generated by said histogram generator; and binarization means for converting the multivalued image data which are processed by said multivalued image processor, into binary image data representing pseudo-gray levels; wherein said multivalued image processor comprises: brightness-up means for shifting up entire pixel levels of the multivalued image data except for a pixel level with a maximum value; gamma correction means for carrying out gamma correction of the multivalued image data after shifting up the brightness; and contrast-up means for increasing contrast of the multivalued image data by changing a level of at least part of the pixels after the gamma correction into another level.