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在相机视野下铺放白色亚克力板或纯白纸,采集图像。打开曲线图。
选择 Line Profile 模式。调节好相应所需的曝光时间、光源、增益和镜头光圈,让白平衡纸显示出来的灰度值大概在 150-200 左右。
在Calibration Algorithm 中将显示的数值设置好。
先暗场、再亮场。
Flat Field 里的 Mode,更改为
On。准备好白色亚克力板(优先),没有可以用白纸代替,需要注意,白色亚克力板的尺寸要大于视野尺寸切反光及颜色均匀,不能有脏污点,光源的均匀度和位置度调整平场校正前后尽可能保持一致。
FPN暗场:盖上镜头盖或者用不透光的物体完全遮挡在镜头前,拍摄一张暗场图片,采集完黑色画面后,点击 FPN—press。
PRNU亮场:打开镜头盖,拍摄一张亮场图片(刚才的白色亚克力板或者白纸),点击 FRNU—press
平场校正完成后,一定记得关闭,Flat Field 里的 Mode,更改为 Off。
将相机调整为实时模式,看平场矫正是否达到预期效果,如果效果不理想可以进行多次矫正,如果还不理想可以换其他更均匀的白色背景板或者微微虚焦下进行平场矫正。