chico92
lvl.2
Flight distance : 584186 ft
Germany
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Hello everyone,
i'd like to share this with you guys, hoping that DJI's R&D-section pays attention to these things. As you may know, there are a few different issues with the newly released Phantom 4 Pro. In this case, i only want to go into the video related ones.
1. 4K @ /48/50/60 Frames per Second isn't real 4K. I bet some of you already heard about that. You can look this up over at the phantompilots board. There you go. So, 4K @ /24/25/30 Frames per second is all fine. Full Sensor Readout, great quality. However, in the new 48/50/60p-Modes, the sensor uses Line-Skipping, which results in cutting the vertical resolution in half. You can see the difference in quality in the comparison shots over at phantompilots. In my opinion, DJI promotes something which isn't a 100% true.
2. There seems to be a problem regarding the Ambarella SoC. If you use very fast shutter speeds in video, for example anything higher than 1/250 which eliminates most of the motion blur, there is a lot of ghosting occuring, especially in the parts of the image which are high contrast. Ghosting occurs also at more used shutterspeeds such aus 1/60, 1/125 and so on, but in this case it depends how you are flying. It appears if you're going rather slow near the ground, or even when you're going at faster speeds in higher altitudes. This results in a huge drop in image quality, since the image get's really blury and unsharp. This is clearly not due to a broken device or an individual case. I tested this with a few other people and the problem is present on every single device.
I attached a screengrab from the original videofile, where you can clearly see the ghosting-effect. You can test this by yourself, just print out a cross on a white paper and stick it to a wall. Then adjust your shutter speed to something higher than 1/250 to make sure that it's not motion blur that you see. Then place your drone on a swivel chair, a video-tripod or anything you can use to pan your device while the camera faces the sheet of paper. If you'd like to see this tested this under more real conditions, download this video-file.
I'd really appreciate it, if this would be forwarded to the R&D-section and not be treated as an RMA- or support-case. It's not.
PS: I don't have the option to place this in the Phantom 4 Pro subboard, maybe somebody can help me with this.
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