Sanyo Electric Co., Ltd.

Takeshi Hachiya

Akihiro Maenaka

Haruhiko Murata

Ryuhei Amano

In a contour correcting circuit that generates, on the basis of respective signals for a plurality of pixels including the pixel to be corrected at the center and arranged in a particular direction, a contour correction signal for the pixel to be corrected, there are provided contour component production means for producing a contour component for the pixel to be corrected depending on the gradient of the change among the respective signals for the plurality of pixels arranged in the particular direction; gain calculation means for calculating, on the basis of the level difference between the signal for the pixel to be corrected and the signal for the pixel adjacent in the particular direction to the pixel to be corrected, such a gain for correction that the larger the level difference is, the smaller the gain becomes; multiplication means for multiplying the contour component produced by the contour component production means by the gain for correction calculated by the gain calculation means; and addition means for adding the results of the multiplication by the multiplication means to the signal for the pixel to be corrected, to generate the contour correction signal for the pixel to be corrected.

Contour correcting circuit and contour correcting method

In an image processing device, an edge detecting circuitproduces edge signals that represent edge components present in image signals, and an adder circuitsuperimposes the edge signals on the image signals to produce edge-enhanced image signals. The image signals before edge enhancement are fed to a range setting circuitso that, based on the image signals preceding and following a target image signal that is about to be processed by a clipper, a range in which the data value of the target image signal is allowed to vary is set. Based on the range of data values thus set by the range setting circuit, the clipperclips the data values of the edge-enhanced image data.

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Kasai, Japan

Takeshi Hachiya