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X射线图像增强器像元响应不一致性是评定图像质量的重要指标,它将影响设备的探测能力和分类级别,因而很有必要对不一致性的进行校正。通过对不一致性产生机理的理论分析,建立了图像增强器的每个像元通道光电响应的对数曲线模型。基于该模型,提出了一种改进的两点校正算法。该算法首先将非线性响应转化为线性响应,然后用基于最小二乘的多点校正算法对线性数据进行校正。校正前后的图像及标准差给出了对比,实验结果表明了该校正方法的有效性。
X-ray image intensifier pixel response inaccuracy is an important indicator of image quality assessment, it will affect the detection capabilities of equipment and classification level, it is necessary to correct the inconsistency. Through the theoretical analysis of the mechanism of inconsistency, a logarithmic curve model of photoelectric response of each pixel channel of image intensifier is established. Based on the model, an improved two-point correction algorithm is proposed. The algorithm first converts the nonlinear response into a linear response, then calibrates the linear data with a multi-point correction algorithm based on least squares. The comparison of the image and standard deviation before and after calibration shows that the calibration method is effective.