A crucial reason for the success of existing NeRF-based methods is to build a neural density field for the geometry representation via multiple perceptron layers (MLPs). MLPs are continuous functions, however, real geometry or density field is frequently discontinuous at the interface between the air and the surface. Such a contrary brings the problem of unfaithful geometry representation. To this end, this paper proposes spiking NeRF, which leverages spiking neurons and a hybrid Artificial Neural Network (ANN)-Spiking Neural Network (SNN) framework to build a discontinuous density field for faithful geometry representation. Specifically, we first demonstrate the reason why continuous density fields will bring inaccuracy. Then, we propose to use the spiking neurons to build a discontinuous density field. We conduct a comprehensive analysis for the problem of existing spiking neuron models and then provide the numerical relationship between the parameter of the spiking neuron and the theoretical accuracy of geometry. Based on this, we propose a bounded spiking neuron to build the discontinuous density field.
The Blender data is organized as follows:
<case_name>
|-- transforms_train.json # camera parameters
|-- transforms_test.json # camera parameters
|-- transforms_val.json # camera parameters
|-- train
|-- r_00.png # target image
|-- r_01.png
...
|-- test
|-- r_00.png # target image
|-- r_01.png
...
|-- val
|-- r_00.png # target image
|-- r_01.png
...
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pip install -r requirements.txt- Training Blender
python nerf_vth2.py --config ./config/xx.txt