Color corrector, video display device, and color correction method

An integrated circuit for performing color correction of a video input signal including a plurality of components for representing a color with a predetermined color space, performing correction by adding a predetermined correction value to an input value of one of the components to be corrected where the input value ranges from a correction region minimum value to a correction region maximum value which is greater than the correction region minimum value, and outputting a corrected value, comprising:

• a correction value calculator configured to calculate an unadjusted correction value based on the input value;
• and
• a correction value adjuster configured to adjust the unadjusted correction value calculated by the correction value calculator so that the corrected value does not decrease with an increase in the input value and ranges from the correction region minimum value to the correction region maximum value, and output the adjusted value as the predetermined correction value,
• wherein the unadjusted correction value:
• ranges from 0 to a predetermined minimum correction value with a slope less than −1 relative to the input value, where the input value is within a range from a first value MI to a second value, and
• is equal to or more than the minimum correction value with a slope of −1 or more relative to the input value, where the input value is out of the range from the first value MI to the second value, and
• the correction value adjuster outputs the unadjusted correction value as the predetermined correction value without any change, where |(the unadjusted correction value)| is equal to or less than |(the input value)−MI|.

A color correction method of performing color correction of a video input signal including a plurality of components for representing a color with a predetermined color space, performing correction by adding a predetermined correction value to an input value of one of the components to be corrected where the input value ranges from a correction region minimum value to a correction region maximum value which is greater than the correction region minimum value, and outputting a corrected value, the method comprising:

• calculating, by a processor, an unadjusted correction value based on the input value;
• and
• adjusting the unadjusted correction value calculated in the calculating the unadjusted correction value so that the corrected value does not decrease with an increase in the input value and ranges from the correction region minimum value to the correction region maximum value, and outputting the adjusted value as the predetermined correction value,
• wherein the unadjusted correction value:
• ranges from a predetermined maximum correction value to 0 with a slope less than −1 relative to the input value, where the input value is within a range from a first value to a second value MA, and
• is equal to or less than the maximum correction value with a slope of −1 or more relative to the input value, where the input value is out of the range from the first value to the second value MA, and
• in the adjusting the unadjusted correction value, the unadjusted correction value is output as the predetermined correction value without any change, where |(the unadjusted correction value)| is equal to or less than |MA−(the input value)|.

A color correction method of performing color correction of a video input signal including a plurality of components for representing a color with a predetermined color space, performing correction by adding a predetermined correction value to an input value of one of the components to be corrected where the input value ranges from a correction region minimum value to a correction region maximum value which is greater than the correction region minimum value, and outputting a corrected value, the method comprising:

• calculating, by a processor, an unadjusted correction value based on the input value;
• and
• adjusting the unadjusted correction value calculated in the calculating the unadjusted correction value so that the corrected value does not decrease with an increase in the input value and ranges from the correction region minimum value to the correction region maximum value, and outputting the adjusted value as the predetermined correction value,
• wherein the unadjusted correction value:
• ranges from 0 to a predetermined minimum correction value with a slope less than −1 relative to the input value, where the input value is within a range from a first value MI to a second value, and
• is equal to or more than the minimum correction value with a slope of −1 or more relative to the input value, where the input value is out of the range from the first value MI to the second value, and
• in the adjusting the unadjusted correction value, the unadjusted correction value is output as the predetermined correction value without any change, where |(the unadjusted correction value)| is equal to or less than |(the input value)−MI|.