双线型像质计的线对识别方法研究

In the image quality evaluation of digital imaging detection, the spatial resolution is measured by imaging with a duplex wire image quality indicator, founding the position of the each line pair, and measuring them. Aiming at the problem of the line pair position recognition and interval segmentation accuracy, several recognition methods were compared experimentally. Finally, a method of automatic division of line pairs position is obtained based on the finding the minimum point combined with the shape characteristics. The method has high identification accuracy and fast calculation speed,which provides convenience for the subsequent automatic measurement of parameters and indirectly improves the automation level of radiographic testing.