how to read column wise pixels using FOR LOOP

when I'm using this code I got below results....... figure,plot(sum(bw,2),1:size(bw,1));

so I need how to read column wise pixels using FOR LOOP? can any one tell me how to read pixels column wise ....?

Thanks in Advance

[Jan]

what does "read pixels" mean exactly? What is the input and what is the wanted output?

[DB]

This is my input image

how to extract only white pixels in the above image and using FOR LOOP and display the result on histogram projection

Thanks you

[Adam]

What exactly are you expecting a histogram of only white pixels to show?!

[DB]

I'm expecting row wise and column wise white pixels on the image using FOR LOOP

[Adam]

It still doesn't make sense what you want. Focus on the result you want. The fact you think you should use a for loop is irrelevant to what you are actually trying to get as an end result.

[DB]

This is my input image

I want output like this

Answer 1

[Adam]

Judging from your last comment what you want is a plot of the number of black pixels in each column of the image:

figure; area( sum( ~bw ) )

should give you this.