smartcrop implementation in Java

smartcrop finds good crops for arbitrary images and crop sizes, based on Jonas Wagner's smartcrop.js

check more debug image

test code will analyze 12 images, analyze took 30ms 640x470.

done: 29386679.jpg / analyze took 1158ms done: 32872321.jpg / analyze took 101ms done: 65131509.jpg / analyze took 75ms done: 65158073.jpg / analyze took 109ms done: 65309527.jpg / analyze took 73ms done: 65334383.jpg / analyze took 61ms done: 65356729.jpg / analyze took 55ms done: 65438769.jpg / analyze took 72ms done: goodtimes.jpg / analyze took 31ms done: guitarist.jpg / analyze took 31ms done: img.jpg / analyze took 30ms done: kitty.jpg / analyze took 30ms saved... 29386679.jpg / took 1738ms saved... 32872321.jpg / took 1475ms saved... 65131509.jpg / took 1201ms saved... 65158073.jpg / took 2170ms saved... 65309527.jpg / took 2397ms saved... 65334383.jpg / took 1063ms saved... 65356729.jpg / took 1396ms saved... 65438769.jpg / took 1359ms saved... goodtimes.jpg / took 1264ms saved... guitarist.jpg / took 1190ms saved... img.jpg / took 702ms saved... kitty.jpg / took 473ms

## Example

> [check test code](https://github.com/QuadFlask/smartcrop-java/blob/master/src/test/java/com/github/quadflask/smartcrop/SmartCropTest.java)

```java
BufferedImage img = ImageIO.read(new File("source.jpg"));

CropResult result = new SmartCrop().analyze(img);

ImageIO.write(result.getBufferedImage(), "png", new File("debug.png"));

• crop feature
• analyze after scale down for performance
• face detection
• remove alpha channel for jpg format