Montfrooij
Captain
Flight distance : 2560453 ft
Netherlands
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Malakai_UK Posted at 2018-4-5 09:02
It's not a change of FOV the OP is experiencing. The image you see will look like its zooming in or out slightly due to the differences in the pixel binning process. its similar to digital zoom.
As a basic example for pixel binning.
The whole sensor is used to capture the video frame but due to the size of each frame there is way too much information for the processor to cope with, so a process called pixel binning is used to reduce the amount of data being sent. Imagine if you had a grid of 10x10 pixels (100 pixels) and your processor can only handle 20 pixels 30 times a second. You still need to capture enough information so see the square but not so much that the processor is overloaded. So to do this you only read every fifth pixel, skipping or binning the ones in between. Now you have your 20 pixel square and this can be processed at 30 times a second. That's ok. Now you bump the frame rate up to 60fps. The processor can process a 10 pixels 60 times a second and to do this will need to read every tenth pixel in grid. Binning the rest. Now when you play this video back it may have slightly more jagged edges or create moire in some areas. Due to the number of pixels it has had to bin from the original image. The other effect it may have is a change in the size of the image captured by a few pixels. Giving the appearance of being zoomed in or a perceived change in FOV.
That does make sense, although I would not call that 'a lot' as the OP was experiencing.
But he (or she) did not provide an example, so I'm not sure what 'a lot' means |
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