US 10,650,500 B2 · Image local contrast enhancement method

Abstract

An image local contrast enhancement method includes: obtaining a first block where a pixel is located and a second block adjacent to the first block, and a gray scale source of a third block; obtaining a source gray scale of a fourth block opposite to the first block; respectively calculating a linear interpolation value according to the source gray scale and a distance between the pixel and the first block, the second block, the third block, and the fourth block; calculating a nonlinear interpolation value of the linear interpolation value by a nonlinear function; performing weighted calculation on the nonlinear interpolation value to obtain a target gray scale. The disclosure increases the diagonal blocks in the local gray scale adjustment, reflects the diagonal direction of the image, enhances the display effect of the local contrast in the smoothing process, enhances the edge image display effect, and improves the user experience.

Claims18

Dependent claims

An image local contrast enhancement method for an image processing apparatus, comprising:

obtaining a source gray scale of a first block where a pixel is located in, a second block adjacent to the first block and a third block, wherein the second block is located at right side of the first block, and the third block is located below the first block;
obtaining a source gray scale of a fourth block opposite to the first block where the pixel is located, wherein the fourth block is located at a lower right corner of the first block;
respectively calculating a linear interpolation value according to the source gray scale and a distance between the pixel and the first block, the pixel and the second block, the pixel and the third block, and the pixel and the fourth block;
calculating a nonlinear interpolation value of the linear interpolation value by a nonlinear function, wherein curve of the nonlinear function is a gamma curve;
performing weighted calculation on the nonlinear interpolation value to obtain a target gray scale of the pixel.

2 more elements

An image local contrast enhancement method for an image processing apparatus, comprising:

obtaining a first block where a pixel is located and a second block adjacent to the first block, and source gray scale of a third block;
obtaining a source gray scale of a fourth block opposite to the first block where the pixel is located;
respectively calculating a corresponding linear interpolation according to the source gray scale and a distance between the pixel and the first block, the pixel and the second block, the pixel and the third block, and the pixel and the fourth block;
calculating the nonlinear interpolation of the linear interpolation by a nonlinear function;
performing weighted calculation on the nonlinear interpolation to obtain the target gray scale of the pixel.

2 more elements

Dependencies are inferred from the claim text.

Image local contrast enhancement method

Life of this patent

Image local contrast enhancement method

Life of this patent

Abstract

Claims18