Water Ripple Treatment Method For LED Electronic Display Screen

First, the difference between LED display water ripple and scan line phenomenon

1, water ripples: generally present irregular arc diffusion state!

2, scan line: horizontal black stripe straight line, mainly due to the low display refresh is captured by the camera!

Second, LED electronic display "water ripple" scientific name "Moore grain"

With digital camera photography, if there is a dense texture, often inexplicable wave-like stripes.

This is the mole line. Simply put, the mole pattern is a manifestation of the beat principle.

Mathematically, when two constant amplitude sine waves with close frequencies are superimposed, the amplitude of the resultant signal will vary by the difference between the two frequencies.

Third, LED electronic display of the process of Moore grain

1. Two stripes with slightly different spatial frequencies have the same position of the black line at the left end of them. Due to different intervals, the stripes can not coincide gradually to the right.

2. The two stripes overlap. The white line can be seen on the left because the black line overlaps.

And the right side gradually dislocation, white line to black line, overlapping results become all black.

There are white lines and all-black variations that make up the mole lines.

Fourth, LED electronic display produces mole grain phenomenon process

Led display screen for sports events requires wide viewing Angle, large visual distance, uniform brightness and adjustable. When the background illumination is less than 20lx, the led display should have a contrast of 100E1. White field color coordinates can be adjusted within 5000K-9500K according to the use environment. According to CIE1931 chrominance system, the tolerance is △ X ∣≦0.030,∣△ Y ∣≦0.030.

Fifth, the method of eliminating the mole grain of LED display screen

1. Change the camera Angle.

Since the Angle at which the camera is shooting the object can cause mole ripples, slightly changing the Angle of the camera can eliminate or alter any mole ripples that exist by rotating the camera.

2. Change the camera position.

In addition, changing the Angle relationship by moving left to right or up and down can reduce the mole ripple.

3. Change focus.

Too sharp focus and high detail can cause mores, and changing focus slightly can alter clarity and help eliminate mores.

4. Change the focal length of the lens.

Different lens or focal length Settings can be used to change or eliminate the mores.

5, the use of mirror filter is directly installed in front of the CCD, so that the exposure conditions meet the spatial frequency, completely filter the high spatial frequency part of the image, reduce the LED display mole lines occur, but it will also reduce the image sharpness.