In actual application of outdoor LED display, LED display water ripple phenomenon 'became the important obstacle of quality high-definition display, so' LED display water ripple phenomenon 'is caused by what?
Do you know about 'LED display water ripple phenomenon'.
manufacturers brought by this article together about outdoor 'water ripple' phenomenon.
A, full-color LED display the difference between water ripples and phenomenon of scan lines 1, the water ripples, generally appear random arc diffusion condition!
2, line: horizontal black stripes straight line, is mainly due to the lower screen refresh is presented camera!
Second, full-color full color LED display
'water ripple' scientific 'Moore lines' with a digital camera filming scenes, if there is a dense texture, often can appear puzzling water sample stripe.
This is what Moore.
In simple terms, Moore grain is a kind of expression of the principle of beat.
Mathematically speaking, the superposition of the continuous sine wave frequency close to two synthetic signal amplitude will change according to the difference between the two frequencies.
Three, full-color LED display Moore lines 1, the process of two spatial frequency slightly different stripes, they left black line position, due to different interval, to the right line stripe gradually cannot overlap.
2, two stripes overlap, the left because of the black line overlap, so you can see the white line.
And right dislocation, white line on the black line, overlapping the outcome become all black.
Have the change of the white line and all black, form the Moore lines.
Four, full-color LED display screen to produce line phenomenon process Moore full-color display pixel distribution density between the interval of CCD can distinguish right, inevitable digital camera will decipher the part can identify as a result, but will also add cannot identify grey terrace zone, and can form regularity of the two lines, response is periodic ripples on the vision.
Five, remove Moore method 1, change the camera Angle.
Due to the Angle of the camera body will Moore corrugated, slightly change the camera's point of view, by rotating the camera, can eliminate or change any of the corrugated Moore.
2, change the camera position.
In addition, by around or move up and down to change the Angle, can reduce the ripple Moore.
3, change focus.
Too clear focus and height details may cause ripples Moore, change focus can change slightly clarity, and thus help eliminate Moore.
4, change the lens focal length.
丌 with lens or focal length set are available, and to change or remove the mole.
5, use mirror filter installed directly in front of the CCD, make its exposure conditions satisfy the spatial frequency, high spatial frequency part thoroughly filtered image, opportunities for decreasing the occurrence of LED display Moore grain, but it will also be synchronous reduce the sharpness of the image.
6, with software processing.
Such as NikonCapture or Photoshop plug-ins, eliminating any Moore corrugated appear on the final image. led screen
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