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C++ code to try to modernize the original Line Segment Detect code

Line Detection Comparison

Image comparison between pytlsd C++ (left) and Opencv C++ (right).

Table with the comparison (ms) of the different parts of the code:

	OpenCV (C++)	pytlsd (C++)	lsd_modern
Gaussian Blur	0.5	43	8
Gaussian Downsample	1.5	31	10
Total	48	214

For a more detailed comparison check the COMPARISONS.md file.

Ref:

• LSD paper: LSD: A Line Segment Detector
• Original C code: lsd c code
• pytlsd repo: pytlsd
• Fast Gaussian blur: Fast Gaussian blur
• Separable Convolution: Separable Convolution