What is a Salt Noise?
Salt noise refers to white spots or dots that appear erratically in digital images. These pixels all have a maximum intensity value of 255, which is typical of an 8-bit grayscale image. These pixels are significantly different from their surrounding pixels, creating a noticeable “salt and pepper” effect. In a grayscale image, a pixel affected by salt noise might be turned to pure white (255) or pure black (0), regardless of its original value.
Explanation: This image shows white pixels randomly distributed over the original image, representing salt noise.
Types of Salt Noise
- Isolated Salt Noise: This is where single or few white pixels are found randomly throughout the whole image.
- Clustered Salt Noise: In this case, groups of white pixels are seen appearing together.
Difference between Salt Noise and Pepper Noise
Digital picture handling includes the unwanted alteration of pixel values in an image which degrades the visual quality and interferes with image analysis. Several types of noise are found in digital images with “salt-and-pepper noise” being one of them, often caused by mistakes during data transmission or when capturing pictures. This type of noise manifests as random white or black pixels on an image that look like salt and pepper sprinkled over it.
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