Patent ID: 9329466
Filing Date: 2016-05-03
CPC Classification: G02B,G02F,G03B,H04N

Claim Text:
1. An image projection apparatus, comprising: an external connection interface configured to receive an input of image data; an illuminance sensor configured to measure surrounding illuminance; an image data processing circuit configured to increase a gradation value of the image data in accordance with a brightness of the input image data; a set information memory configured to store therein correspondence information for each range of the measured illuminance, the correspondence information indicating correspondence between the brightness of the image data and lamp power of a lamp serving as a light source, the lamp power increasing in accordance with the brightness; a total control processing circuit configured to determine the lamp power of the lamp by referring to a table indicating the correspondence information stored in the set information memory, based on the brightness of the input image data and the measured illuminance; and a projector configured to project, with the determined lamp power, the image data having the gradation value increased, wherein in the correspondence information used by the total control processing circuit, a rate of increase of the lamp power, as the brightness of the image data increases, is set lower as the measured illuminance becomes lower.