How to assign zero value to plotted lines
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Hi,
I have the following codes to plot lines on an image. I want to assign zero value to the lines plotted by the following codes. How can I do this ?
plot([xleft xleft],[ytop ybottom],'b','LineWidth',2);
plot([xright xright],[ytop ybottom],'b','LineWidth',2);
plot([xleft xright],[ymiddle ymiddle],'r','LineWidth',2);
plot([xmiddle xright],[ytop ymiddle],'y','LineWidth',2);
plot([xmiddle xright],[ybottom ymiddle],'y','LineWidth',2);
plot([floor(xmiddle/2) xright],[ytop ymiddle],'g','LineWidth',2);
plot([floor(xmiddle/2) xright],[ybottom ymiddle],'g','LineWidth',2);
4 个评论
Stephen23
2016-1-6
Can you explain what you mean by "assign zero value to pixels"? A line is simply some colored pixels, what would they be like if zero was "assigned" to them? How could this be checked or used?
Jan
2016-1-6
It does not makes sense to assign a number to a pixel or to a line. What do you expect as result of such an "assignment"?
Geoff Hayes
2016-1-6
@S.C. - are you trying to draw a box (square or rectangle) on an image (perhaps shown with imshow) with its lines coloured black (zero for each of the red, green, and blue pixel along these lines)?
回答（1 个）
harjeet singh
2016-1-6
hello dear use this code
clear all
close all
clc
x_left=10;
y_left=10;
x_right=100;
y_right=100;
img(1:200,1:200,1:3)=255;
img=uint8(img);
img(x_left:x_right,y_left,:)=0;
img(x_left:x_right,y_right,:)=0;
img(x_left,y_left:y_right,:)=0;
img(x_right,y_left:y_right,:)=0;
figure(1)
imshow(img)
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2016-1-6
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