Patent ID: 8139887

Claim:
An image-signal processing apparatus, comprising: a band pass filter configured to increase the bit count of an input digital image signal in a bit decompression process and pass on an image signal of a high frequency band, wherein said band pass filter extracts horizontal-direction frequency signal components from said input digital image signal and passes on said horizontal-direction frequency signal components; an amplitude limiting section configured to limit the amplitude of said image signal passed on by said band pass filter to a level determined in advance; a subtractor configured to subtract an image signal output by said amplitude limiting section from said input digital image signal; a vertical-direction frequency-component band pass filter configured to extract vertical-direction frequency signal components from said input digital image signal and pass on said vertical-direction frequency signal components; an overlapping-frequency-component band pass filter configured to extract an image signal component overlapping any one of said horizontal-direction frequency signal components passed on by said band pass filter from said vertical-direction frequency signal components passed on by said vertical-direction frequency-component band pass filter and pass on said extracted overlapping signal component; and an adder configured to subtract said overlapping signal passed on by said overlapping-frequency-component band pass filter from said vertical-direction frequency signal components passed on by said vertical-direction frequency-component band pass filter.