Patent ID: 7203375
Filing Date: 2007-04-10
Classification: G06T

Abstract:
1. A quantization error compensation apparatus comprising: a frequency dividing unit to divide an input current image signal expressed by a level a resolution-changing unit to cut m number of Least Significant Bits (LSB) of the first high-frequency signal and to insert a predetermined signal into a position from which the m LSBs were cut to output a second high-frequency signal; an adding unit to add the low-frequency signal and the second high-frequency signal to generate a composite signal; a quantization unit to cut n number of the LSBs of the composite signal and to output the cut composite signal and the n number of a bit signal; an equalizing unit to equalize the cut composite signal according to a predetermined brightness equalizing pattern and to output a first brightness equalizing value with respect to a brightness level of a pixel of the current image signal and a second brightness equalizing value with respect to a next level of the brightness level of the pixel of the current image signal; a compensation value calculating unit to calculate a compensation value using the n number of the bit signal and a difference value between the first brightness equalizing value and the second brightness equalizing value; and a compensation unit to add the calculated compensation value and the first brightness equalizing value and to output an added value, wherein m and n are integers.