how to plot gray-level value versus image height
显示 更早的评论
i have uploaded an image in the link
in that fig(b) says to plot gray-level value versus image height.... how to plot gray-level value versus image height as shown in that figure(b) and how to get those values R1 and R2 from that... please do reply sir.... i need to get the region between R1 and R2 and draw lines in R1 and R2 as in figure(c) and display that much portion in another figure..... please do reply....
采纳的回答
Thorsten
2013-1-16
Iorg = imread('./../../Downloads/r1r2.png');
I = rgb2gray(Iorg(58:242, 60:198, :));
s = sum(I');
[notused R1] = max(s);
minthreshold = 30;
R2 = min(find(s < minthreshold));
subplot(2, 3, [1:3]), imshow(Iorg)
subplot(2,3,4), imshow(I)
subplot(2,3,5),
% plot vertical histogram
N = numel(s);
for i=1:N, line([0 s(i)], N-[i i]+1), end
axis tight
set(gca, 'PlotBoxAspectRatio', [1 size(I,1)/size(I, 2) 1])
xlabel('Gray-level value')
ylabel('Image height')
subplot(2,3,6)
imshow(I)
line(xlim, [R1 R1], 'Color', 'y')
line(xlim, [R2 R2], 'Color', 'y')
3 个评论
Elysi Cochin
2013-1-17
编辑：Elysi Cochin
2013-1-17
Walter Roberson
2013-1-17
Please show size(R1) and size(R2) and size(s)
Elysi Cochin
2013-1-17
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Images 的更多信息
2013-1-16
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
