Patent ID: 6965389

Claim:
An apparatus for converting a first input video signal having a first number of bits into a second video signal having a second number of bits that is smaller than first number of bits, for displaying an image based on the input video signal comprising: an error detector to generate error data in response at least to a data portion of lower significant bits of the first number of bits of the first input video signal, the lower significant bits corresponding to a difference between the first and the second number of bits, the error data being obtained by multiplying the data portion by predetermined error diffusion coefficients according to pixel dots that surround a pixel dot composed of R(red)-, G(green)- and B(blue)-signal components of the first input video signal, at least one of the number of bits of the error diffusion coefficients for one of the R-, G- and B-signal components being different from the other number of bits of the error diffusion coefficients for the other signal components, the error diffusion coefficients being different from each other for the signal components for which the number of bits of the error diffusion coefficients is the same each other; and an adder to add the generated error data to the first input video signal, thus converting the first input video signal into the second video signal.