the motion features Fk are taken as a concatenation of the output features and the downsampled warping flow

[chengzihua]

hello,output features shape is b,128,H/8,W/8, downsampled warping flow shape is b,2,H/8,W/8 ,but Fk shape is b,128,H/8,W/8.What is the connection method? how to get the Fk?

[fh2019ustc]

Hi~ Thanks for your attention to our work!
The shape b,128,H/8,W/8 can be first reshaped to b, 882,H/8,W/8 and then permuted to b, 2, H/8, 8, W/8, 8.
In this way, we can get a flow with shape b * 2 * H * W.
Hope this can help.

[chengzihua]

Hi~ Thanks for your attention to our work! The shape b,128,H/8,W/8 can be first reshaped to b, 8_8_2,H/8,W/8 and then permuted to b, 2, H/8, 8, W/8, 8. In this way, we can get a flow with shape b * 2 * H * W. Hope this can help.

about motion feature generator, How is the output feature of the convolutional layer zθ merged with downsampled warping flow fm(k-1)，and get the motion features Fk?