Patent ID: 8330771

Claim:
A projection display device, comprising: an input module that receives input of an image signal; a discrimination module which discriminates whether the image signal input to the input module is of Computer Graphic images or of natural images; a color correction module which applies color correction processing for Computer Graphic images to the image signal input to the input module when the discrimination module determines the image signal is of Computer Graphic images, or applies color correction processing for natural images to the image signal input to the input module when the discrimination modules determines the image signal is of natural images; and a projection module which generates an optical image based on the image signal applied with the color correction processing by the color correction module, and projects and displays the image on a screen through a projection lens, wherein the discrimination module determines that the image signal input to the input module is of Computer Graphic images when luminous histogram data of the image signal shows a discrete type characteristic, and that the image signal input to the input module is of natural images when the luminous histogram data of the image signal shows a continuous type characteristic, wherein the discrimination module determines that the luminous histogram data has the discrete type characteristic when the number of luminous levels, at which the number of pixels is equal to or smaller than a first threshold value, is equal to or larger than a second threshold value with respect to the luminous histogram data of the image signal input to the input module, and that the luminous histogram data has the continuous type characteristic when the number of luminous levels, at which a difference in the numbers of pixels with an adjacent luminous level is equal to or smaller than a third threshold value, is equal to or larger than a fourth threshold value with respect to the luminous histogram data of the image signal input to the input module.