extracting pixel values from image

Question

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Hello,

I have to get the value of pure black pixel in images which hva colorbar

i have converted the range of pixels using function of thresholding and divided the image accorging.

how can i get value of highest and min value(how pure the black color is?)

like waht is the highrst value of pixels ie highest value of black color in each image?

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Answer 1

编辑：Jose Jeremias Caballero 2020-1-29

0 个投票

 a=imread('binary2.jpg'); 
imshow(a); 
minimum=min(min(a)),
 [row,column]=find(a==minimum); 
hold on,  
plot(column,row,'*'), 
hold off,

minimum =
  uint8
   88

sir i want mininum in the range 0-1 as shown in colorbar

like first pic will have pure black value as 0.8 secind image which vakue low black color will have output according to colorbar as 0.2 something

it worked .

Thankyou