Circle / Ellipse Drawing about imagedraw.jl HOT 13 CLOSED

I'm positive on the idea of this package. Binary dependencies are sometimes a barrier, and Cairo's performance has occasionally been less than impressive. I once tested a draw-lines-to-a-buffer algorithm long ago (I think it's archived on the mailing list), and a pure julia implementation was several times faster. I don't know whether that's still true, though---bugs/performance problems do tend to get fixed over time...

I haven't looked at GLVisualize's code, but if it's using the GPU to do the drawing, I'd say this is not redundant. Our headless server with no DISPLAY will thank you 😄.

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First results of using ImageDraw with BRIEF descriptor and FAST keypoints!

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May I ask why the wheel is reinvented with this package? ;)

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This is just like 1% of the functionality of GLVisualize :) , just some basic drawing functions found in most image processing packages with a simple API which a person can use directly as part of JuliaImages without having to add the entire GLVisualize.

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What about Cairo? Is it not stable enough?
What are the concerns?

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I did not know about Cairo.jl. In this (https://github.com/JuliaGraphics/Cairo.jl/blob/master/samples/sample_arc.jl) is it possible to use an Image/Array directly with the arc function without creating a Cairo context?

from imagedraw.jl.

For example, I need to draw all keypoints and the matches between them. Will something like this be possible?

map(k -> circle!(img1, k, radius = 10), keypoints1)
map(k -> circle!(img2, k, radius = 10), keypoints2)
offset = CartesianIndex(0, size(img2, 2))
grid = hcat(img1, img2) 

map((k1, k2) -> line!(grid, k1, k2+offset), keypoints1, keypoints2)

My concern is that for a person accustomed to using packages like opencv or matlab, the learning curve for using JuliaImages should not be too steep.

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well probably not exactly like this, but I'm sure there is a way to achieve this!

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I haven't really used Cairo but going through the documentation, it seems a bit complicated (I may be wrong). If someone does need a better graphics library, he can move on to Cairo (which is the case with opencv etc as well, they don't have a great drawing module but just the basic functions which are required most of the time). But if just basic stuff is required, this module will be good enough and there is no need to learn another package.

What do you think?

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Another example would be when a person is tracking some object in a video or image and wants it to be marked with the bounding box. Most of the cases in Computer Vision would require simple drawing functions like the ones in this module.

For a more graphics intensive case, like augmented reality where you have a canvas and need to draw complicated figures (2D/3D), something like Cairo or GLVisualize will anyways be the first choice and an image processing library would be used for just for the object detection for example.

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ccing @timholy for advice :)

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Merging #1, #3(needs tests) for now (they contain what I needed for keypoints). Rest of the functions are subject to the outcome of this discussion and will be done later.

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Okay fair enough :) Yeah, this is of course not redundant with GLVisualize ;)

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