LOIC (short for Low Orbit Ion Cannon) is a free and open-source network/website stress testing tool initially developed by Praetox Technologies (currently maintained by the open source community) with C# in 2014. It's made for educational purposes only (that's to say, you should not use this software for illegal or unethical purposes, including activities that give rise to criminal or civil liability), and intended to help server owners develop a "hacker defense" attitude.

When taking photos, some factors (such as shaking during shooting, focus problem, night shooting or shallow depth of field) often cause the shooting effect to be not so clear - with noise points and blurred details, which seriously affect the quality of photos. What do you do then? After all, many frames are so fleeting that they can't be captured again.

As a matter of fact, lossless compression is not very difficult for image files. With proper algorithms, you can compress the file size of an image while preserving as much detail as possible. On the contrary, it is very difficult to enlarge images without quality loss. As everyone knows, image is made up of pixels, and it becomes blurry and distorted when you zoom in on it. If we want to realize the lossless magnification of an image, we need to make up for the missing details after the image enlargement, which has a very high requirement on the calculation and analysis capabilities of program.

Wolfram Mathematica is one of the most powerful and popular general computing systems in the world, as well as one of the most widely used mathematical software programs. Wolfram Mathematica, together with MATLAB and Maple, are called the top three mathematical applications. Since its first release in 1988, it has had a profound impact on how computers are used in technology and many other areas, performing well in almost every computing field, including network, graphics, geometry, data science, data visualization, machine learning, etc.

Noise is most commonly seen in photos taken under high ISO or low light conditions (such as fast action shots, shot at night), but also common in a variety of image files with lossy compression. In cased like this, a good noise-cancelling application becomes an essential tool in every photographer's toolbox.