辐射成像系统图像灰度的自适应显示方法

Adaptive Display of Radiation Inspection Image

辐射成像系统图像变换处理中,通常采用线性变换或对数变换等方法来获得较高的图像显示质量,但这些方法只突出图像的部分灰度段,不利于获得辐射图像的整体信息。本文改进了原有的线性变换方法,研究了在保持图像细节基本无损情况下,根据被检图像特点自适应确定变换参数进行数据变换的方法。实验表明,在保证图像质量同时,该方法能利用8位灰度最大程度地一次性显示16比特图像中整体信息,提高辐射检测速度。

In the radiation imaging system, the gray level of the inspection image is usually 12 or 16 bits, while the conventional computer monitor could only show 8 bits gray image. In order to display the whole information of the image with gray level of more than 8 bits on the normal monitor, it is necessary to construct a mapping function to transform the original image data to display data. The present mapping functions are unable to display the image in optimal state automatically. Based on the analysis of large amount of inspection images, this paper proposed an adaptive way to determine the mapping funetion. The experimental result shows that this method can display the most information of the original image with relatively equalized histogram automatically. It can greatly reduce the image checking time and improve the inspection throughput.