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Meaning of parameters in meta data json files #39

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waps101 opened this issue Jul 7, 2020 · 4 comments
Closed

Meaning of parameters in meta data json files #39

waps101 opened this issue Jul 7, 2020 · 4 comments

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@waps101
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waps101 commented Jul 7, 2020

For the synthetic depth/normal dataset, there is a meta data json file included with the RGB images. This contains two parameters: intSample and fltFov. Could you explain what these mean? Ideally, I would like to be able to compute camera intrinsics in the form of focal length/principal point or a K matrix. Any guidance on doing this from the json files would be appreciated.

@sniklaus
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sniklaus commented Jul 7, 2020

The intSample has little meaning outside the framework that I used to create the dataset. The reason why I included the meta file is the fltFov which is the field of view. You can derive the focal length from the field of view, the principal point is in the center, and the pinhole camera model is not subject to distortions. Please let me know in case there are any missing intrinsics.

@sniklaus sniklaus closed this as completed Jul 7, 2020
@waps101
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waps101 commented Jul 7, 2020

I assume this is horizontal/vertical field of view as opposed to diagonal?

@sniklaus
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sniklaus commented Jul 7, 2020

You are correct.

@sniklaus
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sniklaus commented Jul 7, 2020

You may also find this interesting / useful: #37 (comment)

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