Patent ID: 9076218
Filing Date: 2015-07-07
Classification: G06T,H04N

Abstract:
1. A method for image dynamic range compression with local contrast enhancement, adapted to an image processing device having a processor, comprising: receiving a plurality of input pixels of an image, wherein the input pixels comprise a first input pixel by the processor; obtaining an input luminance pixel value of each of the input pixels and a darkness intensity level of the image by the processor; performing filter computation by the processor based on the input luminance pixel values of the input pixels so as to obtain a filter result of the first input pixel; performing image-related computation by the processor based on the darkness intensity level of the image so as to obtain an image-related parameter; transforming the input luminance pixel value of the first input pixel, the image-related parameter, a first parameter, and a second parameter into a luminance remapping output value of the first input pixel by the processor according to a non-linear intensity-transfer function, wherein the second parameter is a dependent variable of the first parameter, and wherein when the input luminance pixel value of the first input pixel is equal to 0, the luminance remapping output value is 0; and obtaining an output luminance pixel value of the first input pixel by the processor according to a dynamic range compression with local contrast enhancement algorithm based on a ratio of the input luminance pixel value of the first input pixel to the filter result of the first input pixel, the luminance remapping output value of the first input pixel, and a local contrast enhancement component of the first input pixel, wherein the local contrast enhancement component is a multiplication of the input luminance pixel value of the first input pixel and a derivative function of the non-linear intensity-transfer function of the first input pixel.