MATLAB: What excaxtly the gray2ind does

digital image processinggray2indimageimage acquisitionimage analysisimage processingimage reconstructionimage segmentationimageprocessing

in the descripion it says- gray2ind scales and then rounds the intensity image to produce an equivalent indexed image. but what does it do compare to uniformal quantization? if uniformal quantization of 2 levels would send all the values to 0 and 127 , the gray2ind sends all the values to 0 and 255.. for 16 levels it does 16 levels but starts from 17 now and not 0… so whats the logic in this function quantization?

Best Answer

I don't see any use for this function in the way that you described. Why do you want to use it that way? It's main purpose is to reduce the number of gray levels in an image. Here's an explanation of the concept using color images: http://en.wikipedia.org/wiki/Color_quantization

Related Solutions

MATLAB: To display an image

Try this:

imshow(yourImage, []); % Make sure you use the [].

It should work with everything (all 2D images): uint8,uint16, single, double, and RGB. The [] will take the min of the image and map it to 0 and the max and map it to 255 so that you will see the entire range of your image. If you don't do that, and the image is uint8 then it defaults to 0-255 and if your image is, say, all less than 5 gray levels, or a floating point image with really small values, then you won't see anything - it will be too dark.

MATLAB: Rgb2ind equivalent for grayscale images – NOT gray2ind because its not the same, at all.

There is a new imquantize() function. You should probably be using imquantize() for grayscale quantization rather than gray2ind(). I don't see any need for gray2ind().

Best Answer

Related Solutions

MATLAB: To display an image

MATLAB: Rgb2ind equivalent for grayscale images – NOT gray2ind because its not the same, at all.

Related Question