How to read or import SVG images into Matlab?

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Ming Li 2023-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/2064352-how-to-read-or-import-svg-images-into-matlab

评论： DGM 2024-1-3

I have a SVG image produced by Matlab, which contains an image and some lines on it. Now I need to read them back into Matlab. There are several solutions on the FileExchange, but all of them don't work.

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DGM 2023-12-29

I just took a quick look at what's on the FEX. Maybe I missed some, but I see three SVG loading tools:

loadsvg() from #72225

seems to load most sorts of path objects (polylines or curves)
all paths are reduced to polylines by the user-specified decimation

loadSVG() from #66554

appears to rely on the file having been written by a specific application?
looks like it can only handle some polylines/polygons
dumps unhandled errors or java exceptions on every file i've fed it except for two cases:
1: the provided test files
2: cases where it encounters a bezier and errors out cleanly

readSVG() from GP Toolbox #49692

can't seem to follow some filenames/paths due to the way unix find is used
supposedly handles bezier curves, but I seem to only get the vertex list
supposedly returns stroke color, but I haven't observed that either

So you have three tools which can -- to varying degree -- read path objects. None of them can read other types of objects from the file (e.g. rectangles, ellipses, text, or embedded raster data), nor can they preserve any of those objects properties (e.g. color, fill, relative position or applied transformations).

While it's possible to get one or two particular things from an SVG file in a direct manner (it's just a bunch of XML), I don't know of any existing tools. Thinking ahead, it's not clear what form that information would take in the MATLAB workspace, or how it would be practically manipulated. For example, should everything in the SVG be converted into hg objects, or do we need to come up with some new class/classes?

Reading the file is just one challenge, where what you need is an entire set of tools that would facilitate the workflow you're describing. I don't think anybody has that for MATLAB.

If all you need to do is make a few modifications, can those be done in an editor like Inkscape or something? I don't know what level of functionality Office has in that regard.

Ming Li 2024-1-3

移动：Stephen23 2024-1-3

Thank you DMG,

I respectfully suggest that MATLAB consider adding robust support for loading and reading SVG files in future releases. As a passionate user of both MATLAB and the SVG file format, I firmly believe that this enhancement would greatly benefit a growing community of users.

DGM 2024-1-3

I wouldn't object to that. I like SVG and the idea of promoting clean, lossless graphics work. That said, implementation would be quite a bit of a project.

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