What is AGC in Image Processing (Expand Luminance Range 0 to 255)

Hey there,

When i was working on some hdr algorithm i see an argument named AGC. It explains in article such as(starts with Finally..) :

I search it on internet and i see something about speech processing but i think it is about on luminance range as article says too. Here is my algorithm (I have an image named Yhdr) :

Can anyone answer the what is AGC

Thanks

Answer 1

[Walter Roberson]

It is Automatic Gain Control, the same expression used in sound processing.

http://ieeexplore.ieee.org/document/6152438/?reload=true

[Fabio Corres]

This article so complicated for me and i can't see any relation between sound processing :(. Can u help me to code it.

I just want to simple block. Give the function my image and output will be expand

[Walter Roberson]

Different fields use the same term for related concepts. Consider for example that you can "grow" a fruit or "grow" a crystal without the two meaning exactly the same things.

There is no existing block in Simulink or MATLAB to do the kind of automatic gain control being referred to for HDR. I do not seem to have enough enthusiasm to read the article and understand it and program it for you.

Answer 2

[Image Analyst]

You might want to check out the function imadjust().

Or check out the Gamma FAQ and Color FAQ

[Fabio Corres]

when i use imadjust all pixels equal to 255