Patent ID: 8659614
Filing Date: 2014-02-25
Classification: G09G

Abstract:
1. An image display apparatus adapted to display an image based on an image signal input, comprising: a color adjustment circuit that performs one of a modification process and a correction process individually on a hue signal, a lightness signal, and a saturation signal included in first HLS signals as an image signal, and outputs the processed signals as second HLS signals; and a color adjustment instruction section that instructs a processing content of one of the modification process and the correction process performed by the color adjustment circuit, wherein the color adjustment instruction section includes a display control section that displays a color adjusting image showing the processing content of one of the modification process and the correction process performed by the color adjustment circuit on a display section visible to a user, the color adjusting image is an image expressing the processing content of one of the modification process and the correaction process with three images of a hue modifying image, a lightness correcting image, and a saturation correcting image, a number of reference axes for displaying the hue modifying image in the color adjusting image is set by the user, a color space conversion circuit adapted to convert first YUV signals composed of three signals of a luminance signal, a first chrominance signal, and a second chrominance signal included in the image signal input, into the first HLS signals composed of three signals of the hue signal, the lightness signal, and the saturation signal, wherein the color space conversion circuit is a circuit that converts the first YUV signals corresponding to three elements of the luminance, the first chrominance, and the second chrominance constituting a first color space of a three-dimensional Cartesian coordinate system into the first HLS signals corresponding to three elements of the lightness, the saturation, and the hue constituting a second color space of a three-dimensional polar coordinate system, and has the saturation calculation section includes a first multiplier that outputs a first multiplication value as a square value of the first chrominance, a second multiplier that outputs a second multiplication value as a square value of the second chrominance, an adder that outputs an addition value of the first multiplication value and the second multiplication value, and a square root extractor that outputs a square root value of the addition value as a signal corresponding to the saturation, and the hue calculation section is a circuit that outputs a signal corresponding to the hue based on a signal corresponding to the saturation and signals corresponding to the first chrominance and the second chrominance.