A Happy Programmer

http://jsfiddle.net/bysdntox/gnf384gb/ https://www.bennadel.com/blog/2497-cross-fading-images-with-angularjs.htm

http://www.cnblogs.com/tornadomeet/tag/基础学习笔记之opencv/ http://monkeycoding.com/?p=531

http://codepen.io/anon/pen/BWpzBX

http://stackoverflow.com/questions/1122381/how-to-force-child-div-to-100-of-parents-div-without-specifying-parents-heigh

https://www.captechconsulting.com/blogs/android-camera-orientation-made-simple