Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Examples of image distortion methods used in this study (one distortion per image).
| Methods | Examples | ||
|---|---|---|---|
| Rotating transformation | Angle: −20° | Angle: 45° | Angle: 90° |
 |
 |
 |
|
| Shear transformation | Radian: π/6 | Radian: −π/5 | Radian: −π/4 |
 |
 |
 |
|
| Scaling transformation | Size: 0.8 | Size: 0.6 | Size: 0.4 |
 |
 |
 |
|
| Fisheye distortion | Central point: (133, 164) | Central point: (176, 105) | Central point: (110, 92) |
 |
 |
 |
|
