Patent ID: 9115988
Filing Date: 2015-08-25
Classification: G01C,G03B

Abstract:
1. An image projecting apparatus that projects an image on a projection surface, comprising: an illumination measuring unit to measure illumination of light illuminated on a side of the image projecting apparatus opposite a supported surface of the image projecting apparatus; an illumination calculator to calculate an illumination at the projection surface based on the measured illumination measured by the illumination measuring unit; an image projecting unit that projects the image on the projection surface; and a projection light intensity determining unit to determine a luminous intensity of projection light from the image projecting unit, wherein the illumination calculator calculates an illumination at the projection surface based on optical reflecting characteristics of the installation environment of the image projecting apparatus, wherein the optical reflecting characteristics represent a ratio between illumination of incident light and illumination of reflected light at the side of the image projecting apparatus opposite the supported surface of the image projecting apparatus, represent a ratio between standard illumination predefined in accordance with installation environment and the illumination measured by the illumination measuring unit, or are determined based on at least one of material and color of a side of the image projecting apparatus opposite the supported surface of the image projecting apparatus, and wherein the illumination calculator sets the illumination measured by the illumination measuring unit divided by the optical reflecting characteristics as the illumination at the projection surface.