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I'm working on a c programming question and need support to help me learn.

perform the following operation on a given image.

Determine the average value of the image. Use double data type to sum every pixel and divide by the number of pixels in the image. This value will be referred as A. Then calculate the average value of pixels that are greater than A, this value will be referred as H. You need to sum and count. Likewise calculate the average of the values that are less than A: L. Then apply the following formula to each pixel. Do not forget to round and clamp.


C is the parameter of the system, try values between 1 and 127. What do you think this algorithm does?

What I have tried:

I need help to understand what the Algorithm do?!!
Updated 15-Apr-21 8:27am
CPallini 15-Apr-21 8:14am    
You could try it.
Do you forgot to mention that Max(I)=255 ?

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It might help your understanding if you rewrite the formula with meaningful variable names :



C = Parameter
H = AverageHigher
I = Input
L = AverageLower
O = Output

Constant = ( 255 - Parameter ) / ( AverageHigher - AverageLower )
Output = ( Input - AverageLower ) * Constant + Parameter
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