How to enhance the existing image of image.jpg with salt and pepper noise and write matlab program?

Image.jpg how to enhance the image, write matlab program has the following methods:

1. Gray linear transformation is a spatial method, which directly uses the gray value of each pixel to enhance the image. 2. Histogram equalization transformation. It is usually used to increase the global contrast of many images, and the brightness can be better distributed on the histogram. 3. Homomorphic filtering can improve contrast and standardized brightness at the same time by removing multiplicative noise, thus achieving the purpose of image enhancement.

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