Stage Rental LED Screen

Gamma correction

2020-10-19 15:34


In recent years, LED displays have become closer to people's daily lives. LED display has the advantages of high definition, large visibility, and strong flexibility. It is widely used in advertising media, school teaching, art exhibitions, home theaters, wedding events, and other occasions. For example, when advertising is played, the LED display screen can show dynamic advertising content to customers, and businesses can also change the playing content at any time according to their needs. If it encounters foggy weather, the LED display can also penetrate the dense fog, allowing more people to see it. Therefore, the use of LED display screens to play advertisements has gradually replaced traditional advertising boards.

Gamma encoding of images is required to compensate for properties of human vision, to maximize the use of the bits or bandwidth relative to how humans perceive light and color. Human vision under common illumination conditions (not pitch black or blindingly bright) follows an approximate gamma or power function. If images are not gamma encoded, they allocate too many bits or too much bandwidth to highlights that humans cannot differentiate, and too few bits/bandwidth to shadow values that humans are sensitive to and would require more bits/bandwidth to maintain the same visual quality. Gamma encoding of floating point images is not required (and may be counterproductive) because the floating point format already provides a pseudo-logarithmic encoding.

A common misconception is that gamma encoding was developed to compensate for the input–output characteristic of cathode ray tube (CRT) displays.In CRT displays the electron-gun current, and thus light intensity, varies nonlinearly with the applied anode voltage. Altering the input signal by gamma compression can cancel this nonlinearity, such that the output picture has the intended luminance. However, the gamma characteristics of the display device do not play a factor in the gamma encoding of images and video — they need gamma encoding to maximize the visual quality of the signal, regardless of the gamma characteristics of the display device. The similarity of CRT physics to the inverse of gamma encoding needed for video transmission was a combination of luck and engineering which simplified the electronics in early television sets.

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So far, LED displays to have a history of more than 30 years of development. As people's demand for it increases, its variety becomes more and more abundant. Although the most commonly used outdoor and indoor modules are still the most commonly used (p2.5 indoor and outdoor modules, p3 indoor and outdoor modules, p4 indoor and outdoor modules, p5 indoor and outdoor modules, p8 indoor and outdoor modules, p10 indoor and outdoor modules, etc.), but indoor small-pitch LED displays (p1.25 modules, p1.56 modules, p1.667 modules, p1.875 Modules, etc.) are becoming more and more popular. In addition to common fixed-installation and rental LED displays, special forms of LED displays such as transparent screens, sky screens, and floor tile screens are also more attractive. We believe that in the future, LED displays will bring us a more colorful life and visual experience.






 

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