new example from video stream and video4linux

[dehann]

No description provided.

[codecov-io]

Codecov Report

Merging #14 into master will increase coverage by 1.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   94.23%   95.37%   +1.13%     
==========================================
  Files           4        4              
  Lines         243      324      +81     
==========================================
+ Hits          229      309      +80     
- Misses         14       15       +1

Impacted Files	Coverage Δ
src/helpers.jl	99.03% <0%> (+0.56%)	⬆️
src/wrapper.jl	55.17% <0%> (+3.17%)	⬆️

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[Affie]

Hi, I use it in the same way, but didn't want to include it as an example as it uses an unregistered package (V4L.jl).
If you think its ok, you can go ahead and merge it.

[dehann]

I think there is a lot of new memory being created in the current conversion code. I'm guessing there is room for major speedups with Video4Linux if we use view, colorview, and normedview more extensively. We want @time or @btime to read very low levels of new memory consumption... I will commit what I have to v4l.

[Affie]

Thanks, I think you are correct that there is a lot of room for speedups and any help is much appreciated.
Just take note we found a memory leak in imshow JuliaImages/ImageView.jl#138.

[dehann]

Will certainly help with the speedups. I think it is okay to merge the first example. It would probably be better to move the second LCM message example elsewhere... Maybe directly to Caesar.jl since the LCM types are stored in CaesarLCMTypes.jl.

[dehann]

xref dehann/Caesar.jl#102

[Affie]

@dehann, I changed the imshow to avoid the memory leak. It should perform way better now.

[dehann]

Hi, Thanks!

[dehann]

can merge if ready.

[dehann]

cc @GearsAD, for the less leaky memory imshow canvas update.