Projection correcting system and method, and projector

A projector correcting system which, when a plurality of projectors perform projection, performs distortion correction and brightness correction for each projector, comprising:

• a camera for photographing the projected images of the plural projectors;
• and
• a computer which sets up contents to be displayed by the plural projectors, actuates the camera to photograph the displayed contents, acquires from the result of the photographed images, geometric correction data for correcting distortion and blending data for performing brightness correction for each of the plural projectors, creates two-dimensional correction data representing the contents and transmits the two-dimensional correction data to each of the plural projectors, characterized in that
• the plural projectors each include:
• a memory for blending data;
• a memory for geometric correction data;
• an image correcting unit;
• and
• a CPU which, based on the two-dimensional correction data from the computer, creates the blending data and the geometric correction data, stores the data into the memory for blending data and into the memory for geometric correction data, refers, as regards the input image signal, to the stored contents in the memory for blending data and the memory for geometric correction data and causes the image correcting unit to perform distortion correction and uneven brightness correction in accordance with the stored contents.