The unit "Hertz" is exactly the same as "per second". So the last three words of your question don't add any useful information. And the question could really use some additional information, since we have no idea which image you're talking about.
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This feature is a measure of the smoothness of the image.
The four major areas of computer operations in digital image processing is contrast enhancement. The second is remove the blur from pictures and smooth out graininess. The third would be magnifying, and rotating an image. Finally the image is compressed for storage.
A double die coin is one that was struck twice by mistake. When you look at the coin, you see a double image, two of everything. Usually the second image is very faint.
2 mps
There are many ways to measure a contact angle, but the simplest way is to use a goniometer. The image of the droplet is taken with a high resolution camera; the angle can then be measured using a protractor.