למה nr נתמך רק בכניסה אחת?

[israeli1948]

ומה הטכנולגיה מאחורי הטכנולגיה? למה חלק מהמסכים תומכים וחלק לא?



עשיתי חיפוש בפורם רוב התיאורים יבשים, לא מסבירים את הטכנולגיה אלא מה היא עושה, אתה זה אני כבר יודע......
הייתי רוצה להיכנס לקרביים של הטכנולגיה הזאת ולהבין איך היא פועלת, אשמח אם מישהו יוכל להסביר לי במונחים של טיפשים.

[TANDBERG]

זה הכי קרוב שהגעתי אליו:
In images

Images taken with both digital cameras and conventional film cameras will pick up noise from a variety of sources. Many further uses of these images require that the noise will be (partially) removed - for aesthetic purposes as in artistic work or marketing, or for practical purposes such as computer vision.

[edit] Types

In salt and pepper noise (sparse light and dark disturbances), pixels in the image are very different in color or intensity from their surrounding pixels; the defining characteristic is that the value of a noisy pixel bears no relation to the color of surrounding pixels. Generally this type of noise will only affect a small number of image pixels. When viewed, the image contains dark and white dots, hence the term salt and pepper noise. Typical sources include flecks of dust inside the camera, or with digital cameras, faulty CCD elements.

In Gaussian noise, each pixel in the image will be changed from its original value by a (usually) small amount. A histogram, a plot of the amount of distortion of a pixel value against the frequency with which it occurs, shows a normal distribution of noise. While other distributions are possible, the Gaussian (normal) distribution is usually a good model, due to the central limit theorem that says that the sum of different noises tends to approach a Gaussian distribution.

In either case, the noises at different pixels can be either correlated or uncorrelated; in many cases, noise values at different pixels are modeled as being independent and identically distributed, and hence uncorrelated.