Regional enhanced wavefront detection method for low-contrast extended target

The invention discloses a region-enhanced wavefront detection method for a low-contrast extended target, and the method comprises the steps: carrying out the image superposition through combining adjacent sub-images on the basis of obtaining a sub-aperture array image through a Hartmann wavefront sensor, and obtaining a sub-image array with higher contrast; and displacement information of the sub-images is obtained by using the contrast-enhanced sub-image array, so that approximate overall wavefront information is represented. According to the method, the wavefront information of the low-contrast extended target can be detected without adding additional hardware equipment, so that the demand on the target contrast is greatly reduced, and the complexity of the whole system is not increased. The method is high in adaptability, and even can supplement wavefront information of a shielding aperture. 本发明公开了一种低对比度扩展目标的区域增强波前探测方法，该方法在哈特曼波前传感器获得子孔径阵列图像的基础上，通过联合邻近子图像进行图像叠加获得一个具有更高对比度的子图像阵列；再利用对比度增强后的子图像阵列来获得子图像的位移信息，进而