[Feature] utilize mmcv image backend

[fcakyon]

Currently LoadImageFromFile pipeline doesnt support loading mmcv image backends as pillow,tifffile... but mmcv supports it.

This PR adds the support of using other mmcv image backends.

[codecov[bot]]

Codecov Report

Patch coverage is 100.00% of modified lines.

Files Changed	Coverage
mmdet/datasets/pipelines/loading.py	100.00%

:loudspeaker: Thoughts on this report? Let us know!.

[ZwwWayne]

Hi @fcakyon , Thanks for your kind PR. We plan to merge this PR this month, do you have time to continue on this?

[fcakyon]

Hi @fcakyon , Thanks for your kind PR. We plan to merge this PR this month, do you have time to continue on this?

unfortunately i cannot fix the pre-commit error

[JingweiZhang12]

Maybe you should also add some code in init function: if self.image_backend is not None: mmcv.use_backend(self.image_backend) if not, you can not use turbojpeg as backend. jpeg

However, now, using turbojpeg as backend may have a potiential bug in distributing training and test as pointed in jpeg is None

[hhaAndroid]

@fcakyon Do you have any progress?