Patent ID: 6801669
Filing Date: 2004-10-05
Classification: G06T

Abstract:
An image filter processing apparatus, comprising:a memory configured to temporarily store an output value as a filter processing result; a first calculator configured to calculate a difference between an input value of an image signal and the output value stored in said memory, the output value being the filter processing result of a previous input value; a lookup table configured to respectively store a plurality of differences and corresponding change values, and to output a change value corresponding to the difference calculated by said first calculator, the change value being a product of the difference and a value which is above â€œ0â€  and below â€œ1â€  if an absolute value of the difference is below a threshold, and the change value being a product of the difference and a value which is above â€œâˆ’1â€  and below â€œ0â€  if the absolute value is above the threshold; and a second calculator configured to output a difference between the input value and the change value and to store the difference being newly stored in said memory.