Image processing apparatus and method
The present disclosure relates to an imaging processing apparatus and method by which degradation of the quality due to two-dimensional projection of 3D data can be suppressed. All pieces of data for each position included in 3D data representative of a three-dimensional structure are projected to a two-dimensional plane of plural layers. Further, all pieces of data for each position of 3D data projected to a two-dimensional plane having the number of layers indicated by layer number information are projected to a three-dimensional space. The present disclosure can be applied, for example, to an information processing apparatus, an image processing apparatus, electronic equipment, an information processing method, and a program.
1. An image encoding apparatus, comprising:
circuitry configured to:
define a bounding box containing 3D data;
project positional data of the 3D data to at least three 2D layers in a depthwise direction of the bounding box, wherein depth values of the 2D layers are different from each other in the depthwise direction;
encode the projected positional data; and
generate a bit stream including the encoded positional data and signal information representing the number of the 2D layers.
2. The image encoding apparatus according to claim 1 , wherein
the 3D data includes at least three overlapping points that are projected to the respective 2D layers different from each other and each have a same positional data viewed from the depthwise direction.
3. The image encoding processing apparatus according to claim 2 , wherein
the circuitry is further configured to generate a same number of the 2D layers as a maximum number of overlap among the overlapping points.
4. The image encoding apparatus according to claim 1 , wherein
the circuitry is further configured to set a fixed value to a position of at least one of the 2D layers where no positional data is projected.
5. The image encoding apparatus according to claim 1 , wherein
the circuitry is further configured to set, to a position of at least one of the 2D layers where no positional data is projected, a value higher than a maximum value of a depth of the 3D data.
6. The image encoding apparatus according to claim 1 , wherein
the circuitry is configured to project the positional data of 3D data to the 2D layers on a basis of a depth parameter indicating a range with respect to each of the 2D layers in the depthwise direction where the projection of the positional data is allowed.
7. The image encoding apparatus according to claim 1 , wherein
the 3D data includes point cloud data where each point is represented by position information and attribute information.
8. An image encoding method, comprising:
defining a bounding box containing 3D data;
projecting positional data of the 3D data to at least three 2D layers in a depthwise direction of the bounding box, wherein depth values of the 2D layers are different from each other in the depthwise direction;
encoding the projected positional data; and
generating a bit stream including the encoded positional data and signal information representing the number of the 2D layers.
9. An image decoding apparatus, comprising:
circuitry configured to:
decode, from a bitstream, signal information representing a number of 2D layers,
wherein the 2D layers are defined to a bounding box defined to reconstruct 3D data, and
wherein depth values of the 2D layers are different from each other in a depthwise direction of the bounding box;
decode, from the bitstream, encoded positional data to acquire geometry images representing the 3D data,
wherein each of the geometry images represents a corresponding one of the 2D layers to which the 3D data is projected,
wherein the number of geometry images is equal to the number of the 2D layers; and
construct, based on the signal information, the 3D data by projecting each of the geometry images in a three dimensional space in the depthwise direction.
10. The image decoding apparatus according to claim 9 , wherein
the circuitry is configured to construct the 3D data by projecting each of the geometry images in the three dimensional space in the depthwise direction using data other than data of the geometry images having a fixed value representing no positional data.
11. The image decoding apparatus according to claim 9 , wherein
the circuitry is configured to construct the 3D data by projecting each of the geometry images in the three dimensional space in the depthwise direction using data other than data of the geometry images having a value higher than a maximum value of a depth of the 3D data.
12. The image decoding apparatus according to claim 9 , wherein
the circuitry is configured to construct the 3D data by projecting each of the geometry images on a basis of a depth parameter indicating a range in the three dimensional space in the depthwise direction where the projection of the positional data is allowed.
13. The image decoding apparatus according to claim 9 , wherein
the 3D data includes point cloud data where each point of the point cloud data is represented by position information and attribute information.
14. An image decoding method, comprising:
decoding, from a bitstream, signal information representing the number of 2D layers,
wherein the 2D layers are defined to a bounding box defined to reconstruct 3D data, and
wherein depth values of the 2D layers are different from each other in a depthwise direction of the bounding box;
decoding, from the bitstream, encoded positional data to acquire geometry images representing the 3D data,
wherein the number of geometry images is equal to the number of the 2D layers;
projecting, based on the signal information, each of the geometry images to a corresponding one of the 2D layers in the depthwise direction; and
reconstructing the 3D data based on the projected geometry images.