Sanyo Electric Co., Ltd.

Kouichiro Yanagi

Hiroyuki Taguchi

Nobuhiko Omori

A horizontal contour correction circuit for correcting a horizontal contour of a video signal to output as a corrected signal, comprising: a delay circuit for outputting video signal values of a video signal at at least three different times either before or after a reference time, the video signal containing video signal values being input in a time serial manner; a plurality of selection circuits each for combining video signal values selected in advance from a group of video signal values output from the delay circuit, and selecting one video signal value from each combination of the video signal values to output; and a switch circuit for selecting one video signal value from among the video signal values output from the plurality of selection circuits. The video signal values before and after the reference time are respectively subtracted from a video signal value at the reference time, whereby horizontal contour of a video signal is corrected.

Horizontal contour correction circuit

Distortion of an image that is projected to a screen is suppressed by an image processing apparatus including a vertical reduction section for performing reduction and correction in the vertical direction with respect to image data of the projected image and a horizontal reduction section for performing reduction and correction in the horizontal direction with respect to image data on which reduction and correction were performed in the vertical reduction section.

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Himeji, Japan

Kouichiro Yanagi