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当利用X射线数字成像技术对在流水线上运动的工件进行检测时,图像采集系统与工件在曝光时间内发生相对运动,造成了采集到的图像运动模糊降质。通过对运动降质产生机理的理论分析,建立了图像降质的离散退化模型。提出了利用运动模糊降质点扩展函数频域特性加上投影均值最大法来测量模糊运动方向的方法。旋转运动模糊图像的幅度谱图像,利用整列投影值最小法提取运动模糊降质点扩展函数长度。利用维纳滤波法对模糊降质图像进行了恢复,取得了较好的效果。
When using X-ray digital imaging technology to detect the workpiece moving in the pipeline, the relative movement between the image acquisition system and the workpiece during the exposure time, resulting in blurred motion of the captured image. Through the theoretical analysis of the mechanism of motion degradation, a discrete degradation model of image degradation is established. A method of measuring the direction of motion of the fuzzy motion by using the frequency-domain characteristic of the motion-blur descendent point spread function plus the maximum projection mean value method is proposed. The amplitude spectral image of the motion blurred image is rotated, and the length of the motion-blur diminishing point extended function is extracted by using the minimum value of the entire column projection value. The Wiener filtering method is used to recover the fuzzy degraded image, and the better effect is achieved.