The invention discloses a three-dimensional
point cloud geometric
information compression method based on implicit neural representation, and the method comprises the steps: constructing a
trunk structure of an implicit neural network through a plurality of sine representation network
layers which are connected in series, and introducing a variable-scale position coding mechanism on this basis, the method enables a network to obtain higher geometric reduction precision while keeping a
compression ratio, and comprises the following steps: (1) inputting space coordinates of divided voxels into a position coding module with adjustable scale parameters; (2) feeding a coding result into an implicit neural network constructed by a
network layer based on sine representation, and outputting the occupancy probability of the
voxel through an
activation function; (3) in a training stage, the model continuously optimizes parameters, so that the output probability distribution is highly consistent with a real occupied
label; (4) after model training is completed, a method of combining an AdaRound second-order quantization optimization strategy and quantization
perception training is introduced, network weight is finely adjusted, and quantization errors are reduced; (5) in a reasoning stage, judging whether the
voxel is occupied or not according to a preset threshold value, and when the
prediction probability exceeds the threshold value, regarding the
voxel as occupied; and (6) all voxels judged to be occupied are aggregated, and reconstruction of the geometric structure of the
point cloud is completed.