Method and apparatus for contrast enhancement
AssigneeSamsung Electronics Co., Ltd.
InventorsYoung Ran Han, Seung Sin Lee, Du-Sik Park
Life of this patent
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Abstract
A method of enhancing a contrast and an apparatus for enhancing a contrast are provided. The method of enhancing the contrast includes: dividing an image into a plurality of blocks and calculating an average luminance value of each block; interpolating a peripheral luminance value for each input pixel of the image by using the average luminance value; and enhancing the contrast of the input pixel by using the interpolated peripheral luminance value of the input pixel and a unique luminance value of the input pixel.
Claims35
A method of enhancing a contrast, the method comprising:
- dividing an image into a plurality of blocks and calculating an average luminance value of each block;
- interpolating a peripheral luminance value for each input pixel of the image by using the average luminance value;
- and
- enhancing the contrast of the input pixel by using the interpolated peripheral luminance value of the input pixel and a unique luminance value of the input pixel, wherein the enhancing comprises:
- increasing the unique luminance value by using the unique luminance value of the input pixel and the peripheral luminance value of the input pixel;
- and
- decreasing the unique luminance value according to an increase amount of the unique luminance value.
A non-transitory computer-readable recording medium storing a program for implementing a method of enhancing a contrast, the method comprising:
- dividing an image into a plurality of blocks and calculating an average luminance value of each block;
- interpolating a peripheral luminance value for each input pixel of the image by using the average luminance value;
- and
- enhancing the contrast of the input pixel by using the interpolated peripheral luminance value of the input pixel and a unique luminance value of the input pixel, wherein the enhancing comprises:
- increasing the unique luminance value by using the unique luminance value of the input pixel and the peripheral luminance value of the input pixel;
- and
- decreasing the unique luminance value according to an increase amount of the unique luminance value.
An apparatus for enhancing a contrast, the apparatus comprising:
- an average luminance value calculation unit to divide an image into a plurality of blocks and calculate an average luminance value of each block;
- a peripheral luminance value interpolation unit to interpolate a peripheral luminance value for each input pixel of the image by using the average luminance value;
- and
- a contrast enhancement unit to enhance the contrast of the input pixel by using the interpolated peripheral luminance value of the input pixel and a unique luminance value of the input pixel, wherein the contrast enhancement unit comprises:
- a unique luminance value increase unit to increase the unique luminance value by using the unique luminance value of the input pixel and the peripheral luminance value of the input pixel;
- and
- a unique luminance value decrease unit to decrease the unique luminance value according to an increase amount of the unique luminance value.
Dependencies are inferred from the claim text.