MATLAB: Quantize a greyscale Image by 5 levels

image processingImage Processing Toolboxquantize

I would like to quantize an image by 5 levels without using the imquantize command. Given any a grayscale image on a scale of [0,255] this should be possible. Thanks in advance for your time and help.

Best Answer

Q = floor(YourArray ./ (256/5));

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MATLAB: What excaxtly the gray2ind does

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

MATLAB: About quantization of image

Put it in a for loop

grayImage = imread('coins.png');
% Split the image into eight levels by obtaining seven thresholds from multithresh.
for numLevels = 1 : 16
  thresh = multithresh(grayImage, numLevels);
  % Construct the valuesMax vector such that the maximum value
  % in each quantization interval is assigned to the eight levels of the output image.
  valuesMax = [thresh max(grayImage(:))]
  [quant8_I_max, index] = imquantize(grayImage,thresh,valuesMax);
  valuesMin = [min(grayImage(:)) thresh]
  quant8_I_min = valuesMin(index);
  
  % Display both eight-level output images side by side.
  figure;
  imshowpair(quant8_I_min,quant8_I_max,'montage')
  title('Minimum Interval Value           Maximum Interval Value')
  % Set up figure properties:
  % Enlarge figure to full screen.
  set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
  % Get rid of tool bar and pulldown menus that are along top of figure.
  set(gcf, 'Toolbar', 'none', 'Menu', 'none');
  % Give a name to the title bar.
  set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
end

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MATLAB: What excaxtly the gray2ind does

MATLAB: About quantization of image

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