Inference of the multi-view model - guidance required

[Tetsujinfr]

Ok so thanks for all etc but if I want to infer your advanced model on something different than the TUM preprocessed dataset you provide, using the 2 views and masks and optic flaw and key points, does it mean I have to generate all those inputs at the appropriate formats, cast it properly into the expexted HDF5 file structure, all that without any specifications?
For the RGB images, I can manage, but for the flow input what is the expected input format?
For the optional keypoints, what is the expected data format? Can you model support more/less key points than the ones you have in your dictionnaries lists currently?
Back-engeneering your code is not fun.
In the TUM HDF5 files there is more than 5 data subset (I did expect 2 rgb images, one binary mask image, one rgb flow image, one vector of key points pairs), but there are some strange low resolution matrices in the file as well) I do not know if those are only necessary for training of for inference as well.
Any chance you can give some further guidance on the required inputs and required formats?
Thanks

[fcole]

Hi, yes, the code could be more easy to understand, sorry about that. In order to run the full model, you basically need to fill in the dictionary of values specified here:

mannequinchallenge/loaders/image_folder.py

Line 180 in 3448d9d

return {'img': img,

these correspond to the various buffers mentioned in loss definitions in the paper. You don't need to create your own HDF5s etc. as long as you can create a dictionary including those buffers. Hope that helps.

[rmbashirov]

How to I get gt_depth, human_mask, flow, keypoints_img in your format on my own data so that I can inference your full model?

[rmbashirov]

Ok, I realised that providing full pipeline for inferring full model on any data is almost impossible for you.

Can you provide inference result of your full model for MC dataset?

[fcole]

Unfortunately, we don't have permission to share image-like-results (e.g., depth buffers) from the MC dataset. Sorry about that.

For inference, you shouldn't need the gt_depth, and the model with keypoints input performs only marginally better than the model without, so the only things you really need are flow and the human mask.

[Tetsujinfr]

Thanks for your indications above. So I looked at the load_tum_hdf5 function. I have a few questions.

A) the code reads 11 objects:

 - img_1: is it a simple 24bits RGB numpy matrix of the image we are trying to infer?

 - gt_depth: I can ignore it since I just want to infer, but can I just comment this piece of code and all downstream reference to the treatment of this object or do I need to fake a dummy input?

 - lr_error: what is that? Can I ignore the same way as gt_depth? It looks like it is used to comput the confidence map which seems a key input to your model no?

 - human_mask: I assume this is a binary mask of the same size as img_1, right? What is the format expected, 0.0=transparent and 1.0 equals opaque, i.e. the mask shape? (Rgb black/white image I assume?)

 - angle_prior: what is that? Is it the second image? It looks like it is used to comput the confidence map which seems a key input to your model no?

 - pp_depth: what is that? It looks like it is used to comput the confidence map which seems a key input to your model no?

 - flow: the output of FlowNet2 I assume but is it a 24bits rgb image or is it the raw flow data structure of the .flo object of FlowNet? Does it need to have the exact same height × width size as img_1 ?

 - T_1_G: what is that? It looks like it is used to comput the confidence map which seems a key input to your model no?

 - T_2_G: same as for T_1_G

 -  intrinsic: same as for T_1_G

 - keypoints_img: can I just input a keypoint image from OpenPose for instance? Do the points need to be single pixels? Is there a particular colouring scheme for each point which needs to be followed or I can just pass the colouring of OpenPose?

Thanks a lot for your guidance on this.

[zhengqili]

Hi, I am the first author of this paper.

img_1: should be RGB image between 0 and 1
lr_error: is the left-right consistency error corresponding to C_lr in Eq.5 of supplementary material: http://www.cs.cornell.edu/~zl548/images/mannequin_depth_cvpr2019_supp_doc.pdf
human_mask: is the binary mask, where 1 indicates human, 0 indicates background.
angle_prior: is C_pa in Eq.5 of supplementary material.
pp_depth: depth from motion parallax using P+P representation in Eq. 4 of supplementary material.
T_1_G: this is the 4X4 homogenous transformation matrix from global to reference image described in the paper.
T_2_G: this is the 4X4 homogenous transformation matrix from global to source image in the paper.
intrinsic: 3X3 intrinsic matrix
keypoints_img: You can use any keypoint detection algorithm you want but you have to normalize their index based on MaskRCNN. In particular, what you need to do is from https://github.com/roytseng-tw/Detectron.pytorch/blob/master/lib/utils/vis.py, you can see line 198-199:
i1 = kp_lines[l][0]
i2 = kp_lines[l][1],

you need to normalize it by using following code:
final_i1_value = (i1 + 1.0)/18.0
final_i2_value = (i2 + 1.0)/18.0

Please send me email ([email protected]) for more questions since I seldom reply in Github.