LinLog图像处理技术.docVIP

1.2 LinLog图像处理技术 BCGLookup： Applies a brightness, contrast, and gamma correction to an image. The correction is performed by computing and applying a lookup table. Brightness, Contrast, and Gamma control the changes made to the transfer function represented by the lookup table. 通过对转移函数曲线的设置和应用，改变整幅图像的亮度、对比度和灰度值分布。 BCG Values is a cluster of the brightness, contrast, and gamma values. Brightness (default = 128) sets the brightness of the image. This value is used as the x intercept of the transfer function in the lookup table. The neutral value is 128 (no change in the image). A higher value returns a brighter image. A value less than 128 decreases the overall brightness of the image. 亮度数值是函数曲线X轴的截距，截距越大，整幅图像亮度越大。 Contrast (default = 45.0) sets the contrast of the image. This control is used as the slope of the transfer function in the lookup table and is expressed in degrees. A slope of 45 degrees is neutral. A higher value returns a more contrasted image. A value smaller than 45 decreases the contrast of the image. 对比度数值是函数曲线的斜率，用角度表示，角度越大，对比度越大。 Gamma (default = 1.0) sets the gamma correction applied to the image. The neutral value is 1. A value greater than 1 gives extended contrast for small pixel values and less contrast for large pixel values. A value smaller than 1 returns an image with less contrast for small pixel values and extended contrast for large pixel values. Gamma定义了图像灰度分布的非线性校正，其值大于1时，低亮度区域对比度增强，高亮度区域对比度减弱，其值小于1时，刚好相反。 MathLookup： Converts the pixel values of an image by replacing them with values from a defined lookup table. This VI modifies the dynamic range of either part of an image or the complete image, depending on the type of curve chosen. 根据选用的响应曲线，改变每一像素点的灰度值，进而改变图像的动态范围。 Range is a cluster containing the minimum and maximum pixel values of the range to modify. If you do not connect this cluster or you keep the default values of (0,0), the VI modifies the dynamic range of the entire image. The dynamic range of the destination image is dep