Patent ID: 6972793

Claim:
A video signal processing device for maintaining signal levels of one or more red signals, one or more green signals and one or more blue signals per pixel of a video signal under a predetermined reference level, comprising: luminance signal forming means for forming a luminance signal of said pixel based on said red signal, green signal and blue signal per said pixel of said video signal; detection means for detecting saturation of said pixel of said video signal; compression processing means for compression processing said red signal, green signal and blue signal of the corresponding pixel without changing hue and saturation of said pixel but changing brightness based on said luminance signal formed by said luminance signal forming means and the corresponding detection result obtained by said detection means; control means for controlling the signal levels of said red signal, green signal and blue signal compression processed by said compression processing means without changing said hue and said brightness of said pixel but changing said saturation; first generating means for generating a first brightness transfer gain signal; second generating means for generating a second brightness transfer gain signal; and third generating means for generating a third brightness transfer gain signal as a function of the first brightness transfer gain signal and the second brightness transfer gain signal, whereby said device is operable to compression process selected pixels by performing, for each such selected pixel, two luminance knee processing operations followed by a saturation knee processing operation, wherein the two luminance knee processing operations are performed as a function of the third brightness transfer gain signal.