Patent ID: 8169500
Filing Date: 2012-05-01
Classification: H04N

Abstract:
1. A dynamic range (D-range) compression apparatus into which is inputted an image signal having a variable D-range, the apparatus comprising: a spatial processing unit operable to calculate a surrounding average luminance signal for the image signal; a visual processing unit operable to perform D-range compression processing so that the variable D-range of the image signal falls within a predetermined output D-range by converting the image signal based on tone conversion characteristics determined in accordance with the surrounding average luminance signal; a peak detection unit operable to detect a peak value within an image formed by the image signal; and an amplification unit operable to perform dynamic amplification processing in accordance with the peak value so that the variable D-range of the image signal outputted by the visual processing unit becomes the predetermined output D-range by converting the image signal outputted by the visual processing unit based on amplification input/output conversion characteristics determined based on the peak value.