How to quantize hsv ?

So, i just converted one rgb image to hsv.

Now, i want to quantize this one to get 18 H, 3 S and 3 V.

I'm a beginner in this area. Can someone give me some tips or ideas to do this ?

Thank you all

Answer 1

[Vidhi Agarwal]

Hi @Pedro,

I understand you are trying to quantize an HSV image into 18 H bins, 3 S bins, and 3 V bins using MATLAB. Below steps can help you in getting started:

• Read and convert RGB to HSV.
• Quantize each channel. Sample code for the same is given below:

img = imread('your_image.jpg');       % Load image
img_hsv = rgb2hsv(img);               % Convert to HSV
H = img_hsv(:,:,1);                   % Hue in range [0, 1]
S = img_hsv(:,:,2);                   % Saturation in range [0, 1]
V = img_hsv(:,:,3);   
Hq = floor(H * 18);    % 18 bins → values from 0 to 17
Sq = floor(S * 3);     % 3 bins → values from 0 to 2
Vq = floor(V * 3);     % 3 bins → values from 0 to 2
% Handle edge cases where value = 1 (since floor(1*18)=18, not valid)
Hq(Hq == 18) = 17;
Sq(Sq == 3) = 2;
Vq(Vq == 3) = 2;

• Create a Single Quantized Label Map: By combining the quantized channels into one index (0 to 161).

Hope this helps!.