How do I find Gray Level Variance of the Image?

1. How is variance calculated in image processing?
2. What is the grey level represented by in digital imaging?
3. How do you reduce the gray level of an image?

How is variance calculated in image processing?

mean = sum(x)/length(x) variance = sum((x - mean(x)). ^2)/(length(x) - 1);

What is the grey level represented by in digital imaging?

The grey level or grey value indicates the brightness of a pixel. The minimum grey level is 0. The maximum grey level depends on the digitisation depth of the image. For an 8-bit-deep image it is 255.

How do you reduce the gray level of an image?

A more versatile method of gray _level reduction is the process of taking the data and reducing the number of bits per pixel. This can be done very efficiency by masking the lower bits via an AND operation. Within this method, the numbers of bits that are masked determine the number of gray levels available.