Create comprehensive demos

[huningxin]

Create comprehensive demos for each category, like image processing, real-time video processing etc.,

[sajjadt]

I add few categories and demo ideas that can be easily included.

1. Basic operations (blend, invert, color conversion)
2. Canny edge detector
3. Adaptive threshold or equalizeHistogram
4. HAAR object detector (for detecting faces)
5. Filters: erode, blur
6. Motion detection and tracking
7. Stats: histogram
8. Image transformations: image warp, change perspective,
9. Core: drawing?

[huningxin]

Turn the list to a check list

• [x] Basic operations (blend, invert, color conversion)
• [x] Canny edge detector
• [x] Adaptive threshold or equalizeHistogram
• [x] HAAR object detector (for detecting faces)
• [x] Filters: erode, blur
• [ ] Motion detection and tracking
• [x] Stats: histogram
• [ ] Image transformations: image warp, change perspective,
• [x] Core: drawing?

[huningxin]

https://github.com/huningxin/opencv.js/tree/master/samples

and

https://codepen.io/collection/nJbkNo/

[huningxin]

Done for announcement. Will add more samples into https://github.com/huningxin/opencv.js