Panasonic PV500 User Manual page 89

Setting Dynamic thresholding
Binarizes pixels using the threshold that is
calculated by adding the offset value to
the gray average of the specified size.
The pixels with the gray level over the
threshold change to white, and the pixels
with the gray level below the threshold
change to black.
It is helpful to binarize the image the
brightness of which is uneven or the
image the brightness of which varies.
1. Set "Size X/Y".
Set a range to calculate the average.
Select (check) "Set size X/Y individually." to set X and Y
directions to different sizes. Now you can set Size Y.
2. Set "Offset".
When the average is 100 and the offset is -30, binarizes the
pixels with the gray level over 70 to white and the pixels with the
one below 70 to black.
About Frequency Extraction
Two filters are provided, which are Smoothing Filter and Sharpening Filter.
Using "Smoothing Filter" removes fine edges. Defocused image can be obtained in whole. (Removes high
frequencies.) Using "Sharpening Filter" removes the part showing the modest variation in brightness. Image
with a clear-cut edge can be obtained. (Removes low frequencies.) Using these two filters in combination
enables a specific frequency to be obtained.
1. Select and check "Smoothing Filter".
2. Set "Size X/Y".
If "Sharpening Filter" is unchecked, only the result of
the application of Smoothing Filter can be confirmed.
Set the appropriate value to remove unnecessary
edges by increasing the value checking the image.
Select (check) "Set size X/Y individually." to set X and Y
directions to different sizes. Now you can set Size Y.
3. Select and check "Sharpening Filter".
4. Set "Size X/Y" and "Gain".
Set the value to enhance the part you want to extract
checking the image.
Increasing the gain makes the difference in the gray
level of the image larger.
Binary┌────┴────┐Dynamic
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