FOR-A IVS-200 Operation Manual page 32

The CORRECTION LEVEL menu allows you to set the correction level for the AVO function.
The five correction level options are as shown below in order from darkest to brightest.
DARKER < DARK < STANDARD < BRIGHT < BRIGHTER
If an insufficient correction is obtained using the given level options, set to ADJUST to enable
customized corrections.
Details on setting parameters are as shown below.
<IN WHITE LEVEL>
The maximum value of luminance in the sample data is defined as 100%. Based on this
reference value, this determines the highest level of luminance for level control.
If the value is too large, some noise may be picked up, causing the results to become
unstable. If the value is too small, it increases contrast, but it may cause the images to be
overexposed.
＜IN BLACK LEVEL＞
The minimum value of luminance in the sample data is defined as 0%. Based on this
reference value, this determines the lowest level of luminance for level control.
If the value is too small, some noise may be picked up, causing the results to become
unstable. If the value is too large, it increases contrast, but may cause the images to be
underexposed.
The figures below are luminance histograms of input.
(X-axis: Luminance level, Y-axis: Number of pixels)
Maximum
Minimum
value of
value of
inputs 100％
inputs 0％
IN BLACK LVL IN WHITE LVL
IN BLACK LVL IN WHITE LVL IN BLACK LVL IN WHITE LVL
If the correction range is wide.
If the correction range is narrow.
<TARGET WHITE LEVEL>
Determines the maximum value of luminance for outputs.
The maximum luminance value of the image after correction should approximate this value.
The larger the value, the brighter the image, which may however cause the image to be
overexposed. The smaller the value, all brightness characteristics will be retained, however,
a darker image will result.
<TARGET BLACK LEVEL>
Determines the minimum value of luminance for outputs.
The minimum luminance value of the image after correction should approximate this value.
The larger the value, dark areas in pictures will appear brighter, which may however lower
the contrast and the noise will become apparent. The smaller the value, the higher the
contrast, which may however cause the image to be underexposed.
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