What did you make the filter out of? Is there a pattern in it? If cloth of some sort, there would be a weave to it that would show up as dots.
a. computers are used in all digital technologies.
One can watch videos of visible lasers on videos sharing websites such as Amazon. There are a number of videos to choose from, ranging from homemade videos, to professionally composed videos.
The visible shape of a mineral's pattern is called a crystal. Solidified minerals that are from a molten state have smooth faced, angular crystals.
A modified radical mastectomy leaves a woman with a more normal chest shape than the older radical mastectomy procedure, and a scar that is not visible in most clothing.
The newest digital hearing aids are so small that they can fit completely inside the ear canal. This makes them barely visible to other people.
Origin
Origin
The visible shape of a mineral's pattern is called a crystal. Solidified minerals that are from a molten state have smooth faced, angular crystals.
Digital watermarking is used to avoid illegal copying of images by integrating a more or less visible copyright notice on the photo. Most image converters (see reference link fro an example) can overimpose digital watermarks on the photos.
Granulation.
A constellation.
Most digital camera sensors are sensitive to a small range of IR, as well as visible light.