How to save an image in this situation quickly without using 'saveas' and 'insertShape'?

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Tong Wang 2018-7-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/411440-how-to-save-an-image-in-this-situation-quickly-without-using-saveas-and-insertshape

评论： DGM 2023-9-12

I want to generate an image like this. Initially i just have an processed image, then i need to plot mask (the blue one) over the image and save it, by using imshow diplay the image and then plot lines over it, i do get the result.

The problem is, if i use imshow and then plot mask over image, for exporting i must use 'saveas' or 'print', but this is a disaster for lots of high resolution images, it will be exdremely slow.

For this reason i tried the 'insertShape', this function adds lines directly in image matrix, then using 'imwrite' to save image will be much more quicker than 'saveas' or 'print', but here is the problem! you can see 'insertShape' produces wrong and incomplete lines (inside the yellow circle), and this is more serious when i process high resolution image.

So is there a third way to quickly export image with masks? Thanks a lot

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Walter Roberson 2018-8-7

Using a large line width creates problems with the caps at every turn because no curvature or bezelling is applied.

DGM 2023-9-12

This is the same problem as the earlier thread:

https://www.mathworks.com/matlabcentral/answers/411443-problem-with-insertshape

Given that this problem only occurs for certain vertex lists, and only seems to occur when multiple polygons are given in a single call to insertShape(), then I would not call this expected behavior.

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