Image Processor, Image Processing Method, and Image Display Device

An image processing method for correcting image data representing a gray-scale value of each of pixels of an image, based on a change in the gray-scale value of each pixel, the image processing method comprising:

• a step of dividing a current-frame image into a plurality of blocks, thereby outputting first encoded image data, corresponding to the current-frame image, the first encoded image data including a representative value denoting a magnitude of pixel data of each of the blocks, and a quantized value obtained by quantizing the pixel data in each of the blocks based on the representative value;
• a step of decoding the first encoded image data, thereby outputting first decoded image data corresponding to the current-frame image;
• a step of delaying the first encoded image data for a period equivalent to one frame, thereby outputting second encoded image data corresponding to the image preceding the current frame by one frame;
• a step of decoding the second encoded image data, thereby outputting second decoded image data corresponding to the image preceding the current frame by one frame;
• a step of calculating variations of the representative value and of the quantized value between the current-frame image and the image preceding by one frame, by referring to the first and the second encoded image data, and generating a control signal denoting a change in the pixel data of the current frame in each of the blocks, based on these variations;
• a step of generating one-frame-preceding image data by selecting the current-frame image data or the second decoded image data on a pixel to pixel basis, based on the control signal;
• and
• a step of compensating a gray-scale value of the current-frame image, based on the current-frame image data and the one-frame-preceding image data.

An image processor that corrects image data representing a gray-scale value of each of pixels of an image, based on a change in the gray-scale value of each pixel, the image processor comprising:

• an encoding means for encoding image data representing a current-frame image thereby outputting the encoded image data corresponding to the current-frame image;
• a decoding means for decoding the encoded image data thereby outputting first decoded image data corresponding to the current-frame image data;
• a delay means for delaying the encoded image data for a period equivalent to one frame;
• a decoding means for decoding the encoded image data outputted from said delay means thereby outputting second decoded image data corresponding to the image data preceding the current frame by one frame;
• a means for calculating a variation between the first and the second decoded image data and an error amount between the current-frame image data and the first decoded image data on a pixel to pixel basis, and generating one-frame-preceding image data by selecting either the current-frame image data or the second decoded image data on a pixel to pixel basis, based on the variation and the error amount;
• and
• an image data compensation means for compensating a gray-scale value of the current-frame image, based on the one-frame-preceding image data and the current-frame image data.

An image processing method for correcting image data representing a gray-scale value of each of pixels of an image, based on a change in a gray-scale value of each pixel, the image processing method comprising the steps of

• encoding image data representing a current-frame image, thereby outputting the encoded image data corresponding to the current-frame image;
• decoding the encoded image data, thereby outputting first decoded image data corresponding to the current-frame image data;
• delaying the encoded image data for a period equivalent to one frame, thereby outputting second decoded image data corresponding to the image data preceding the current frame by one frame;
• calculating a variation between the first and the second decoded image data and an error amount between the current-frame image data and the first decoded image data on a pixel to pixel basis,
• generating one-frame-preceding image data by selecting the current-frame image data or the second decoded image data on a pixel to pixel basis based on the variations and the error amounts, either;
• and
• compensating a gray-scale value of the current-frame image, based on the one-frame-preceding image data and the current-frame image data.