MATLAB Answers

The pixel size of an image doesn't match the axis scale

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MCC
MCC on 29 Nov 2020
Commented: MCC on 30 Nov 2020
I plot an image, which is shown below. According to the X axis scale, the legth of red line is 0.5. And the black line is the same length as red line. So, the total length of this two lines is 1. If you look the the X axis, the total length of the two line is close to 2.5, which does not match the X axis dimension.
My question is that can we change the dimension of the piexl so that pixel size of an image match the axis scale.
Thanks,
MCC
  4 Comments
MCC
MCC on 30 Nov 2020
No, it's not the default. Please find the code and data in the attachment.
Thank you,
MCC

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Answers (1)

Image Analyst
Image Analyst on 29 Nov 2020
Since the distance between tick marks is 2, and the left one is at 0.5, then the left edge of the image is at X = (0.5 - 2) = -1.5.
So the red line is about 2 long, and the gray line is around 1.8 long and the total of the two lines is about 2 + 1.8 = 3.8 long.
Did you use 'XData' and 'YData' in imshow when you displayed it?
imshow(yourImage, 'XData', [xmin, xmax], 'YData', [ymin, ymax]);
  1 Comment
MCC
MCC on 30 Nov 2020
Thanks for your reply. I tried this but it doesn't work. I have attached the code and data. Thanks again.

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