CODEWITHSUNDEEP
image-processing
gagaga
gagaga

Reputation: 37

Image Processing : How to get luminance weighting value?

Currently, I read a paper like this, and this.

I'm looking for the methods about luminance weighting value.

When I saw the paper they explained so abstracted. (for example, they explain like this : L_weight(i,j) is a positive single-peak function (e.g triangular function or Gaussian function) value for the luminance value at i-th row, j-th column of the k-th block.)

So I can't get a hint for getting luminance weighting value. Would you please let me know for any hint to get luminance weight value or the equation of L_weight(i,j) ?

Does anyone know How to get luminance weighting value? or any hint?

Upvotes: 2

Views: 173

Answers (1)

Piglet
Piglet

Reputation: 28994

I took a quick look at the first paper you linked.

The text tells you everything you need to know.

Experimental result shows that a dark color has less color deviation under different light source. Also, at high luminance, the color components are easy to be saturated. Hence, those pixels with middle luminance value in the pre-captured image are more important when performance the light source estimation

They introduce a luminance weight in form of a single peak function like Gauss. So values with medium luminance have more weight than low and high values. A weight between 0 and 1 should be fine.

Upvotes: 3

Related Questions