Patent ID: 9467646
Filing Date: 2016-10-11
CPC Classification: G06T,H04N

Claim Text:
1. An image signal processing apparatus comprising: down-converter circuitry configured to down-convert an image signal having a first resolution into an image signal having a second resolution lower than the first resolution; high-frequency-band-edge detection circuitry configured to perform filtering on the image signal having the first resolution to extract components in a higher frequency band than a frequency corresponding to the second resolution and to perform down-conversion on an edge detection signal obtained through the filtering to obtain an edge detection signal having the second resolution; and combination circuitry configured to combine the edge detection signal having the second resolution obtained by the high-frequency-band-edge detection circuitry with the image signal having the second resolution generated by the down-converter circuitry so as to obtain an image signal having the second resolution for display, wherein assuming that a down-conversion ratio is N:1, N being an integer of 2 or more, the down-conversion performed by the high-frequency-band-edge detection circuitry includes dividing the edge detection signal obtained through the filtering into units of 2N pixels, generating continuous 2N sets of two pixels from edge detection signals corresponding to 2N pixels of each division unit and the first pixel of a next division unit following said each division unit, the 2N pixels and the first pixel being continuous, and extracting, from the 2N sets, a set of two pixels having the largest absolute difference.