Picture signal processing device, picture signal processing method, and picture display device

A picture processing method for use in a picture processing device in which a horizontal contour correction processing is used together with non-linear processing, comprising:

• extracting a high-frequency component of a picture signal;
• generating a contour correction signal by selectively multiplying the high-frequency component by an arbitrary accentuation amount;
• correcting a horizontal contour of a picture by adding the contour correction signal to the picture signal;
• measuring the number of pixels of each luminance level of the picture signal to acquire a luminance histogram;
• and
• computing a control amount instructing the accentuation amount on the basis of the luminance spectrum;
• and the method further comprising:
• acquiring a first control amount for each level of the horizontal contour correction from the luminance histogram, acquiring a second control amount for each luminance level of the non-linear processing from the luminance histogram;
• and
• acquiring a third control amount which can acquire the first control amount when the second control amount is given to make the third control amount be a control amount of the horizontal contour correction.

A picture display device which applies horizontal contour correction processing and non-linear processing to an input picture signal to display the picture signal, comprising:

• a horizontal contour correction module configured to extract a high-frequency component of a picture signal, generate a contour correction signal by selectively multiplying the high-frequency component by an arbitrary accentuation amount, and correct a horizontal contour of a picture by adding the contour correction signal to the picture signal;
• a histogram acquisition module configured to measure the number of pixels of each luminance level of the picture signal to acquire a luminance histogram;
• a computation control module configured to compute a control amount instructing the accentuation amount on the basis of the luminance histogram;
• and a display module configured to display the picture signal with the horizontal contour correction processing performed thereto, wherein
• the computation control module acquires a first control amount for each luminance level of the horizontal contour correction processing from the luminance histogram, acquires a second control amount for each luminance level of the non-linear processing from the luminance histogram;
• and acquires a third control amount which can acquire the first control amount when the second control amount is given to supply the third control amount to the horizontal contour correction module.