Sony IMX206 – 16 MP (found in Xiaomi Yi, Git2, SJCAM M20, Yi Lite,…).Sony IMX078 – 12MP (found in EKEN H8, Elephone Elite,…).Omnivision OV4689 – 4MP (found in EKEN H9, Elephone ELE Explorer, Amkov AMK7000S…).When looking at the data sheet of the sensor, you can see that 4K output is not listed.Īt this point compliments to GitUp and SJCAM as they integrated an 4K option to their cameras, but never advertised them as 4K camera furthermore indicate that 4K resolution is interpolated. Good example is the very common 16 MP Sony IMX206 sensor used in Git2, YI Action Camera 1 & SJCAM M20. Their latest version Mk IV crops the output source, which looks like zooming into the frame.Įven if the sensor offers more than 8MP it might not be capable of 4K resolution. take the Canon 5D DSLR: with their first HD recording version, the Mk II, they binned (downscaled) the sensor output. Cameras with larger sensors will benefit from a higher photo resolution. If you crop top & bottom of a 12 MP sensor to get to a 16:9 format, you will end up with the 8MP for 4K resolution. Why are there 12MP sensors? It’s more than needed fro 4K? As explained above also the photo is resized from the 4MP sensor! Therefore check the sensor type. The EKEN H9 is sometimes advertised as 12MP camera, but just the max.
Same applies to the Aptina ON AR0330 sensor.īe aware, often cameras are advertised as 12 MP cameras, but the Megapixel just refer to the max. take the EKEN H9 which has a 4MP sensor (Omnivision 4689), but is branded 4K. Which means if the sensor is smaller than 8MP, you can’t get a 4K video out of it. Nevertheless if you multiply the pixels you’ll get a result of about 8,8 MP (4K) or 8,29 Megapixel (UHDTV). The 16:9 format (3840 x 2160 pixels) is called UHDTV (Ultra HD). When there should be motion but 2 frames show the exact image, the frame was doubled.ĤK resolutions is 4096 x 2160 pixels and is actually not 16:9. You can’t tell from specs when browsing them, only when looking through your footage frame by frame.
The output file now shows 30fps, but it looks like 15 fps. 15 frames per second are recorded and each frame is doubled. Here’s an example of a 10fps 4K video, recorded with an EKEN H9 and an early firmware:Īs mentioned at the beginning there is another trick: Doubling frames. If it is less than 24fps it will be less fluent, more likely a stop motion video. Watch out which frame rate the camera can do in 4K. So how can you check if it is a real, native 4K camera? Frame Rate If the sensor / processor is not capable of doing 4K at a reasonable frame rate, the frames are doubled to state a better figure on paper. In other words the sensor’s output is a lower resolution than 4K and then the image is upscaled by interpolation.
This process works by guessing or “interpolating” values based on a weighted average of known pixels in the vicinity. Upscaling uses known pixel values to estimate unknown intermediate pixels. Therefore the original source at a lower resolution is upscaled to achieve a 4K output file. Real 4K or native 4K is simply explained: the original source (sensor output) is 4K resolution.Īs mentioned at the beginning, “4K cameras” sell better. Find out about the difference about real vs fake 4k: Although their output video size is 4K, it might not be real 4K. Simple reason, they sell better wearing this logo. There are a lot of action cameras branded “4K camera”.
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