Different approaches for partial image derivation

1. What are derivatives in image processing?
2. How do you derive an image?

What are derivatives in image processing?

Derivative filters provide a quantitative measurement for the rate of change in pixel brightness information present in a digital image.

How do you derive an image?

Image derivatives can be computed by using small convolution filters of size 2 × 2 or 3 × 3, such as the Laplacian, Sobel, Roberts and Prewitt operators. However, a larger mask will generally give a better approximation of the derivative and examples of such filters are Gaussian derivatives and Gabor filters.