Member-only story
Transform in image pre-processing
Images are processed in matrix or vector form, and some times for preprocessing an image we required to perform complex operations which needs specific version of particular image to act upon it.Transform is a recipe which transform images into another but equivalent form and then after applying processing over it again perform inverse transform to achieve the actual form.
Why we need transform?
When images are processed in spatial domain some filter requires image is in specific form then transform operations comes into picture, in which input image is transfomred using transform operator then apply filter over it after that inverse transform is applied to get final output image.Below diagram shows illustrative flow of the transfrom process.
Numerical example
Numerical working example is given below with step by step process, where input image matrix is input image,Log-Transformed Matrix log opertor , mean filter is used as pre-processing filter.
Input Image Matrix
| 10 20 30 |
| 40 50 60 |
| 70 80 90 |