Blur tool of the common types of blur

The Gaussian blur is an American Adobe image software company develops a drawing software: Adobe Photoshop (series) in a filter, the specific location in: Filter - blur - Gaussian blur. Gaussian blur principle, it is based on the Gaussian curve to adjust the pixel color value, it is selective blurring of the image, that is, Gaussian blurring can be a Gaussian curve around the pixel color value of the statistics, the use of mathematical weighted average of the calculation method to get the color value of this curve, and finally be able to leave the silhouette of the characters, that is, the curve. is the bell-shaped curve generated when Adobe Photoshop applies weighted averaging to pixels.

All colors are nothing more than numbers, and all kinds of blurring are nothing more than algorithms. The pixel color value to be blurred statistics, using mathematical weighted average calculation method (Gaussian function) to get the color value, the range, radius, etc. to blur, is Gaussian blur. The problem of motion blur is triggered by the blurring phenomenon in conventional films of moving objects. A sheet of film is exposed as it passes in front of the lens, then leaves the lens and is rolled onto a film spool. However, when the film is exposed, if the object in front of it is moving, the image recorded on the film may be blurred due to the object's motion. If the object is moving very slowly when the film is exposed, the blurring recorded on the film is very slight. The faster the motion, the more severe the blurring recorded on the film. It is very difficult to simulate motion blur using computer-generated images, and most renderings can only represent the moment in time when the image is drawn. That is to say, all kinds of changing things are "frozen" and then drawn. For example, for a three-dimensional image, the position of all the objects is always fixed before drawing. As for what direction the object is moving and how fast it is moving, it is not shown. Because motion blur is produced by the movement of objects, to simulate a state of motion blur, the time of film exposure has to be utilized to show the sense of motion. This would require more information for the computer, the program would be much larger, and the processing time would increase a lot.