测试发现NIvision中实际使用的公式是:

int brightness=199;

float contrast=61.38;

float gamma=0.52;

uchar lut[256];

float k = tan(contrast*CV_PI / 180);

for (int i = 0; i < 256; i++)

{

    lut[i] = saturate_cast<uchar>(k*(pow(i, gamma)/ pow(255, gamma) * 255 - 128) + 128 + (brightness- 128));

}

与Nivsion Vision Assistant 界面上显示的LookUp Table可能不一致