geometrical defocussing

例句：

1. 1. The geometrical defocussing technique is used to correct the image in a camera lens.
   几何失焦技术用于校正相机镜头中的图像。
2. 2. In photography, geometrical defocussing is used to create a shallow depth of field effect.
   在摄影中，几何失焦用于创造浅景深效果。
3. 3. The geometrical defocussing algorithm was developed to improve the quality of images taken with wide-angle lenses.
   几何失焦算法被开发出来，以提高使用广角镜头拍摄的图像质量。