Phones nowadays have cameras that are so perfect in quality, yet security cameras are mostly always so grainy so why? You can get a phone with a perfect extremely high quality camera for a few hundred these days, sometimes even less
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It’s probably due to space constrictions. Phone cameras when they take a video may take up like 20 to 100 megabytes for a minute or two. But security camera are constantly taking video 24/7 and they need to store that video for maybe a week or two so overtime they need a lot more storage.
On top of that that, the reason pictures from phones look so good because they use a lot more pixels to make that image, more pixels used for an image so therefore more space is needed. Vice versa with less pixels needing less space but that produces a more grainy picture. So security cameras are probably more grainy because they use less pixels per second of video to save on space.
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