Patent ID: 7796140

Claim:
A projection system comprising: an information processing apparatus that carries out image processing on an image of an image source in which color tone of each pixel is represented with a predetermined amount of information, the image source including a plurality of image data, including latest image data and preceding image data; and a projector that projects an image based on an image data signal outputted from the information processing apparatus; and a signal transmission unit that carries signals between the information processing apparatus and the projector, wherein: the information processing apparatus includes: a modified-part detection unit that compares each latest image data with immediately preceding image data to detect a modified part, the modified part being a different part of the latest image data that is modified from the immediately preceding image data; a modified-image data generation unit that generates modified-image data of the modified part by adding color-tone data to each pixel in the modified part detected by the modified-part detection unit; and a color-tone correction unit that carries out color-tone correction of the image data according to color characteristics of the projector, the projector includes a current-image frame generation unit that generates a new current-image frame based on the modified-image data from the information processing apparatus, the modified-part detection unit detects the modified part with an accuracy of not more than the amount of information indicating the color tone of each pixel of the image source, the modified-part detection unit compares image data with each other that are color-tone-corrected by the color-tone correction unit, and detects the modified part with an accuracy of not more than the amount of information indicating the color tone after color-tone correction.