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This paper proposes a phase-to-depth deep learning model to repair shadow-induced errors for fringe projection profilometry (FPP). The model comprises two hourglass branches that extract information from texture images and phase maps and fuses the information from the two branches by concatenation and weights. The input of the proposed model contains texture images, masks, and unwrapped phase maps, and the ground truth is the depth map from CAD models. A loss function was chosen to consider image details and structural similarity. The training data contain 1200 samples in the verified virtual FPP system. After training, we conduct experiments on the virtual and real-world scanning data, and the results support the model’s effectiveness. The mean absolute error and the root mean squared error are 1.0279 mm and 1.1898 mm on the validation dataset. In addition, we analyze the influence of ambient light intensity on the model’s performance. Low ambient light limits the model’s performance as the model cannot extract valid information from the completely dark shadow regions in texture images. The contribution of each branch network is also investigated. Features from the texture-dominant branch are leveraged as guidance to remedy shadow-induced errors. Information from the phase-dominant branch network makes accurate predictions for the whole object. Our model provides a good reference for repairing shadow-induced errors in the FPP system.
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SSN: Soft Shadow Network for Image Compositing
We introduce an interactive Soft Shadow Network (SSN) to generates controllable soft shadows for image composit- ing. SSN takes a 2D object mask as input and thus is ag- nostic to image types such as painting and vector art. An environment light map is used to control the shadow’s char- acteristics, such as angle and softness. SSN employs an Ambient Occlusion Prediction module to predict an inter- mediate ambient occlusion map, which can be further re- fined by the user to provides geometric cues to modulate the shadow generation. To train our model, we design an efficient pipeline to produce diverse soft shadow training data using 3D object models. In addition, we propose an inverse shadow map representation to improve model train- ing. We demonstrate that our model produces realistic soft shadows in real-time. Our user studies show that the gen- erated shadows are often indistinguishable from shadows calculated by a physics-based renderer and users can eas- ily use SSN through an interactive application to generate specific shadow effects in minutes.
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- Award ID(s):
- 1816514
- PAR ID:
- 10286980
- Date Published:
- Journal Name:
- IEEE Conference on Computer Vision and Pattern Recognition
- ISSN:
- 2163-6648
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Accepted Manuscript1.0
- Conference Paper:
- The DOI is not currently available.
