Patent ID: 8870393
Filing Date: 2014-10-28
Classification: H04N

Abstract:
1. An image projection apparatus comprising: an obtain unit that obtains image data; a first correction unit, that corrects the image data obtained by the obtain unit; a second correction unit that corrects the image data corrected by the first correction unit; an image projection unit that projects an image <on a projection plane based on image data; a sensor that senses a color on the projection plane; and a controller; wherein the controller controls the image projection unit to project a white color image on the projection plane, wherein the white color image is not corrected by the first correction unit and the second correction unit, and controls to cause the sensor to perform a first sensing in which the sensor senses the projection plane on which the white color image is projected, wherein the controller computes a gain of the first correction unit based on both data of the white color image sensed in the first sensing and an ideal white color value of the white color image, wherein he controller controls to cause the first correction unit to correct a gray color image by using the gain, controls the image projection unit to project the gray color image corrected by the first correction unit on the projection plane, and controls to cause the sensor to perform a second sensing in which the sensor senses the projection plane on which the gray color image is projected, wherein the controller computes a chromaticity based on a sensed result of the second sensing, wherein the controller estimates a type of light source in an environment in which the image projection apparatus is located, based on the chromaticity, and wherein the controller determines a correction table for correcting RGB values of image data input in the second correction unit in accordance with the type of the light source.