Feature request: Base.show for OpenCV.Mat image

[rakeshksr]

@ashwani-rathee

It's good to have Base.show method to display images in pluto.jl directly.

Currently, I implemented a simple(hacky) method for my needs to show images in pluto.jl

using ImageIO
using ImageShow
using ImageCore
using OpenCV

function Base.show(io::IO, ::MIME"image/png", opencv_img::OpenCV.Mat{UInt8})
	# opencv_img = OpenCV.cvtColor(opencv_img, OpenCV.COLOR_BGR2RGB)
	prmt_img::Array{UInt8, 3} = permutedims(opencv_img, (1, 3, 2))
	if size(prmt_img, 1) == 1
		img2d = dropdims(prmt_img; dims=1)
		img = colorview(Gray, float.(img2d)./255)
	else
		img = colorview(RGB, float.(prmt_img)./255)
	end
		
	Base.show(io, MIME"image/png"(), img)
end

[ashwani-rathee]

Can you please make a PR? I would love to get it in

[rakeshksr]

IMO depending on ImageIO.jl, ImageShow.jl and ImageCore.jl for Base.show makes OpenCV.jl little heavy. From what I understood correctly, ImageShow/showmime.jl uses FileIO.jl for Base.show methods.

Why don't follow similar approach by adding FileIo.jl integration with opencv.jl then write Base.show method on top of that?
This makes OpenCV.jl not depends on ImageIO, ImageShow and ImageCore.

Maybe we can depends on ImageCore for OpenCV.jl <=> Images.jl conversion in future.