Taking photos with electronic banners with iPhone will have incomplete fonts
by Poster
May 21, 2025
9
This problem is not present in every photo, but the probability is very high. Is it caused by the electronic banner screen flashing? How to avoid it
Replies
-
Anonymous2147 May 21, 2025This happens to any imaging device Solution: Just do everything possible to extend the exposure time
-
Anonymous1866 May 21, 2025Because the electronic screen is always flashing, which is equivalent to progressive scanning, the human eye has a visual persistence effect to see the complete text. Don't talk about the iPhone. If you take a SLR camera, you can't get the complete text without changing the settings.
-
Anonymous2148 May 21, 2025It is indeed caused by screen flicker, because for the 0.00 x seconds when you press to shoot, only part of the banner screen has content, and the rest is blank. The solution is to extend the exposure time
-
Anonymous9256 May 21, 2025@ Anonymous2148 Can iPhone be extended manually?
-
Anonymous2149 May 21, 2025@ Anonymous9256 There seems to be two ways for native cameras, one is to enter night mode and the exposure time adjustment option will appear; One is to take a Live Photo, which can be set to be converted to a single long exposure.
-
Anonymous1906 May 21, 2025In the electronic banner, the display of each point is scanned and displayed, and only some areas are displayed at the same time. This is the same as taking pictures of a CRT monitor with a camera. It is necessary to lengthen the exposure time to ensure that all words are scanned once before they can be fully photographed.
-
Anonymous2150 May 21, 2025The reason is very simple. This is the problem of sampling law. Although your mobile phone can be said to choose pal or ntsc, you cannot guarantee that the hardware of every screen you shoot can strictly comply with the integer multiple refresh rate, and there will inevitably be stroboscopic. This is the signal acquisition problem
-
Anonymous1846 May 21, 2025Shutter speed is higher than the strobe frequency of the screen
-
Anonymous9040 May 21, 2025The next camera app that can control the shutter speed, set the shutter speed to the refresh frequency of the electronic screen you want to shoot. If you don't know, you can try a multiple of 50, such as setting the shutter speed to 1/50, 1/100 and so on, but the electronic screen doesn't seem to follow this frequency.