Patent ID: 11908369
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. The contrast enhancement device of claim 6, wherein:
when the luminance value of the input data is lower than the middle gray input luminance value, the process circuit determines the conversion difference value for the luminance value using equation: CONV_DIFF=2*(OUT_LOW−IN_LOW)*Y_IN /IN_LOW−(OUT_LOW−IN_LOW)*(Y_IN){circumflex over ( )}2/(IN_LOW){circumflex over ( )}2, wherein CONV_DIFF represents the conversion difference value, OUT_LOW represents the low gray output luminance value, IN_LOW represents the low gray input luminance value, and Y_IN represents the luminance value of the input data,
when the luminance value of the input data is higher than the middle gray input luminance value, the process circuit determines the conversion difference value for the luminance value using equation: CONV_DIFF=2*(OUT_HIGH−IN_HIGH)*(Y_IN−IN_MID)/(IN_HIGH−IN_MID)−(OUT_HIGH−IN_HIGH)*(Y_IN−IN_MID){circumflex over ( )}2/(IN_HIGH-IN_MID){circumflex over ( )}2, wherein CONV_DIFF represents the conversion difference value, OUT_HIGH represents the high gray output luminance value, IN_HIGH represents the high gray input luminance value, Y_IN represents the luminance value of the input data, and IN_MID represents the middle gray input luminance value, and
when the luminance value of the input data is equal to the middle gray input luminance value, the process circuit determines the conversion difference value as 0, and
wherein the process circuit calculates the output luminance value corresponding to the luminance value of the input data using equation: Y_OUT=Y_IN+CONV_DIFF, wherein Y_OUT represents the output luminance value, Y_IN represents the luminance value of the input data, and CONV_DIFF represents the conversion difference value.