camera parameters from colmap have some problems

[lovejoker1102]

Hi, I recently try to run colmap to get the camera parameters, but I found something confused. Colmap's input is DTU scans, when feature extraction I use PINHOLE camera model which is same as yours. However, after I converting the colmap output to mvsnet input by colmap2mvsnet.py, I have found the camera intrisic and extrinsic parameters are quite different from yours. Could you tell me how you run colmap (maybe some setting I have ignored?)

[hhl134]

你好！ 我也是遇到关于colmap生成参数有问题的情况 我将提供的测试集的图用colmap+colmap2mvsnet.py跑出来的结果与实际提供的差很多 当然生成的结果也不对 但不知道错在哪 请问大佬解决了吗

[lovejoker1102]

你好！ 我也是遇到关于colmap生成参数有问题的情况 我将提供的测试集的图用colmap+colmap2mvsnet.py跑出来的结果与实际提供的差很多 当然生成的结果也不对 但不知道错在哪 请问大佬解决了吗

mvsnet的相机参数我记得是从ground truth转换过来的，colmap跑出来的精度没有那么高，所以结果要比原来差

[hhl134]

大佬知道怎么转换吗 ground truth是指啥 标定得到的相机参数？

[lovejoker1102]

对的，dtu有标定好的相机参数Sent from my iPhone------------------ Original ------------------From: hhl134 @.>Date: Tue,Jun 20,2023 7:48 PMTo: YoYo000/MVSNet @.>Cc: KissSheep @.>, Author @.>Subject: Re: [YoYo000/MVSNet] camera parameters from colmap have some problems(Issue #147)

大佬知道怎么转换吗 ground truth是指啥 标定得到的相机参数？

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[hhl134]

现在我是想自己做测试集 他也提供了colmap2mvsnet.py 就大佬上面问的问题 想问下大佬解决了吗 就colmap生成出来的相机参数不能用的情况 我不管是用dtu还是tat哪个数据集来用colmap生成都不行 都不是他给的数据的效果

[lovejoker1102]

你说的是参数跟他的参数看起来差别大还是说跑出来效果差别大Sent from my iPhone------------------ Original ------------------From: hhl134 @.>Date: Tue,Jun 20,2023 8:27 PMTo: YoYo000/MVSNet @.>Cc: KissSheep @.>, Author @.>Subject: Re: [YoYo000/MVSNet] camera parameters from colmap have some problems(Issue #147) 现在我是想自己做测试集 他也提供了colmap2mvsnet.py 就大佬上面问的问题 想问下大佬解决了吗 就colmap生成出来的相机参数不能用的情况 我不管是用dtu还是tat哪个数据集来用colmap生成都不行 都不是他给的数据的效果

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[hhl134]

两个都是有 首先就是相机的外参跑出来就差很多 对应的深度值就不对了 那生成出来的深度图 点云图肯定就不对了

[lovejoker1102]

Colman跑出来确实有误差 效果比原来差是正常的 相机参数差很多是因为坐标系选择不一样 深度不一样也是尺度不一样导致的 原因还是出在colmap精度不够发自我的iPhone------------------ Original ------------------From: hhl134 @.>Date: Tue,Jun 20,2023 8:40 PMTo: YoYo000/MVSNet @.>Cc: KissSheep @.>, Author @.>Subject: Re: [YoYo000/MVSNet] camera parameters from colmap have some problems(Issue #147) 两个都是有 首先就是相机的外参跑出来就差很多 对应的深度值就不对了 那生成出来的深度图 点云图肯定就不对了

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[Gaozihui]

@HaoyangHuang Hi, I also have this problem now and could you please provide more specific information on the different coordinates used from "相机参数差很多是因为坐标系选择不一样". Thanks a lot~