When using a mobile phone or camera LED display
, ripples and scan line appears on the photo, the customer is very worried about the quality of LED electronic screen.
These phenomena is not LED display caused by itself, is when you take a photo using a mobile phone, camera Angle and focal length, read this article you can see.
One, the water ripples and scan line difference: the difference between the water ripples appear random arc diffusion condition commonly!
Scan line is horizontal black stripes straight line, is mainly due to the low LED display refresh is presented camera!
Second, the "water ripple" name "Moore lines" (
Using a digital camera filming scenes, if there is a dense texture, often can appear puzzling water sample stripe.
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, Moore lines 1, the process of two spatial frequency slightly different stripes, they left black line position is the same, because the interval 丌 with, to the right line gradually 丌 can overlap.
2, as a result, the two stripes overlapped on 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.
3, two groups of stripe coincide, can see the typical Moore lines.
Four LED display, LED display produce Moore phenomenon process display unit is rent from the RGB tricolor, uniform distribution on the LED electronic screen.
Detail structure schematic for CCD digital camera, by the distribution of the Mosaic color piece calculated each pixel color content.
Note: if the LED electronic screen pixel distribution density is just between the CCD can distinguish between lattice, inevitable from the digital camera will decipher the part can identify as a result, but also can add 丌 terrace with identification of ash, and can form regularity of the two lines, response is periodic ripples on the vision.
Five, remove Moore method 1, change the camera Angle.
Moore ripple due to camera Angle will not object, slightly changing the Angle of the camera (
By rotating the camera)
Can eliminate or change any Moore corrugated exist.
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.
Detailed drawings on too clear focus and height details may cause Moore corrugated, change focus can change slightly clarity, 迚 and 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 Moore's grain, but it will also be synchronous reduce the sharpness of the image.
6, with software processing.
Such as Nikon Capture or Photoshop plug-ins, etc. , to eliminate any Moore corrugated appear on the final image.
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