imref2d error: Array indices must be positive integers or logical values.

Question

Zi Qing Chua 2022-9-4

0
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https://ww2.mathworks.cn/matlabcentral/answers/1794365-imref2d-error-array-indices-must-be-positive-integers-or-logical-values

回答： Matt J 2022-9-4

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Hi everyone,

I'm trying to calculate the circles from my figure, but the code shows error.

Command window shows:

Array indices must be positive integers or logical values.

Error in trial0621 (line 12)

RI = imref2d(size(subtract),xWorldLimits,yWorldLimits);

when I run the code. Does somebody know how to fix the error? Thank you very much for the help.

Here's my code:

clc
xWorldLimits = [-960 960];
yWorldLimits = [-600 600];
blank1 = imread('C:\Users\zz\Desktop\sample images for matlab\backg.bmp');
data = imread('C:\Users\zz\Desktop\sample images for matlab\test1.bmp');
subtract = data-blank1;
enhance = imadjust(subtract,[0.001 0.03]);
gray = rgb2gray(enhance);
BW = imbinarize(gray,'global');
SE = strel("disk",3);
BW2 = imopen(BW,SE);
RI = imref2d(size(subtract),xWorldLimits,yWorldLimits);
imshow(BW2,RI);
[brightcenters,brightradii,brightmetric] = imfindcircles(BW2,[5 50],'ObjectPolarity','bright','sensitivity',0.85);
h = viscircles(brightcenters,brightradii);
hold on
grid on
plot(brightcenters(:,1),brightcenters(:,2),'+','LineWidth',1.5)
count = height(brightradii)
size = mean(brightradii)
Mx = mean(brightcenters(:,1))
stdevx = std(brightcenters(:,1))
My = mean(brightcenters(:,2))
stdevy = std(brightcenters(:,2))