How to assign zero value to plotted lines

Question

S C.Carl 2016-1-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262861-how-to-assign-zero-value-to-plotted-lines

回答： harjeet singh 2016-1-6

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);

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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)?

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Answer 1

harjeet singh 2016-1-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262861-how-to-assign-zero-value-to-plotted-lines#answer_205304

在 MATLAB Online 中打开

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)