Projector, projection transform processing device, and image processing method in projector

A projection transform processing device performing a transform process on input image data input thereto using a transform technique of projection transform, comprising:

• a frame image storage unit that stores the input image data;
• a block image storage unit that has a smaller capacity than that of the frame image storage unit and that stores a part of the input image data in terms of block image data including M×N (where M and N≧2) pixels;
• a transform processing unit that performs the transform process on the basis of the block image data stored in the block image storage unit and generates transformed image data representing an image after the transform process has been performed thereon;
• and
• a block image predicting unit adapted to:
• while the transform processing unit performs the transform process on a predetermined pixel, predicts the block image data necessary for the transform process on a pixel to be processed after the predetermined pixel;
• and
• if the predicted block image data is not stored in the block image storage unit, reads the predicted block image data from the frame image storage unit and stores the predicted block image data in the block image storage unit.

An image processing method in a projector projecting and displaying an image on a projection plane, comprising:

• storing input image data input to the projector in a frame image storage unit;
• storing a part of the input image data in a block image storage unit, which has a smaller capacity than that of the frame image storage unit, in terms of block image data including M×N (where M and N≧2) pixels;
• performing a correction process of correcting a distortion of the image projected onto the projection plane to generate corrected image data which is image data after the correction process has been performed on the basis of the block image data stored in the block image storage unit;
• while the correction process is performed on a predetermined pixel, predicting the block image data necessary for the correction process on a pixel to be processed after the predetermined pixel;
• and
• if the predicted block image data is not stored in the block image storage unit, reading the predicted block image data from the frame image storage unit and storing the predicted block image data in the block image storage unit.