针对CCD成像时中间亮两边暗的畸变特点，用双线性插值的方法对图像进行灰度校正。
According to the imaging character of CCD, a new method to calibrate the distortion image is brought forward.
进而计算了圆孔中的声质点速度，并分析了孔中速度的畸变情况、最后给出了圆孔的非线性声阻和声抗的理论值。
Furthermore, the time history and spectrum of the average flow velocity through an orifice are computed, from which the nonlinear distortion of flow velocity is analyzed.
此值控制着畸变的量。负数值校正镜头圆桶状面性畸变，而整数值校正镜头针尖状点性畸变。
This value controls the amount of distortion. Negative values correct lens barrel distortion, while positive values correct lens pincushion distortion.
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