How can I find the value with the most change in my histogram?

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ThatStudent 2019-10-13

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关闭： MATLAB Answer Bot 2021-8-20

[N,edges] = histcounts(Y);

min = mean();

[k1,k2,k3]=size(imYuv) %Size of the picture

for i=1:k1

for j=1:k2

if Y(i,j)>min

Y(i,j)=0;

end

imYuv(:,:,1)=Y;

final = colorspace('RGB<-YUV',imYuv);

I know the value is around .64 something.

But im trying to automated so it can select that for my threshold value.

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Image Analyst 2019-10-13

I don't understand. Do you just want to blacken any values higher than 0.67? Or is it variable? Because you have lots of minimums all over the place. If it's variable then how are we supposed to know to take the min between 0.5 and 0.7 and not the min between 0.5 and 0.35, or any other min?

ThatStudent 2019-10-13

Yeah I want to just blacken the values greater than 0.67, and use that to make all the values greater than that black. What my professor told me was to, get the minimun next to the largest or the one with the biggest change . That is how you would know to use that minimum instead of the others.

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KALYAN ACHARJYA 2019-10-13

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编辑：KALYAN ACHARJYA 2019-10-13

在 MATLAB Online 中打开

More detail with example:

data=[1 2 -4 5 6 0 5 20 10]; % Hist data is just simillar array
diff_data=diff(data)
idx=find(diff_data==max(diff_data));
threshold=data(idx+1)

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ThatStudent 2019-10-13

Should I use the N or the edges or would it work with both?

KALYAN ACHARJYA 2019-10-20

You can get it just see the maximum different (with neighbours) in number of pixels (N).

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