Image recognition - data augmentation

Data augmentation

Increase the use of data , Achieve the effect of data set expansion , Improve the recognition effect of the model .
In real projects , Usage scenarios are often fixed , It's best to use real data . The significance of data expansion is to improve the stability of the model , Or improve its generalization effect .
（1） Flip
Include ： Flip horizontal 、 Flip vertically 、 Up and down translation, etc .

（2） rotate
Rotate the original image at a certain angle , As new image .
The usual rotation angle is -30°、-15°、15°、30° Wait for the right angle value .

（3） Scale transformation
Change the image resolution to that of the original image 0.8、0.9、1.1、1.2 Equal multiple , As new image .

（4） Color jitter
Slightly disturb the original pixel value distribution of the image （ That is, add slight noise ）, As new image .