Inter-component residual prediction for attributes in geometry point cloud compression coding

A method of decoding encoded point cloud data, the method comprising:

• for a point of a point cloud, determining a first color value for a first color component based on a first predicted value and a first residual value;
• receiving, in the encoded point cloud data, a first syntax element indicating a scalar value, wherein the scalar value is an integer value;
• applying a scaling factor to the first residual value to determine a predicted second residual value, wherein the scaling factor has one or both of a non-integer value or an absolute value greater than one, wherein applying the scaling factor to the first residual value comprises:
• performing a multiplication by the scalar value;
• and
• performing a right shift operation, wherein a result of a combination of the multiplication by the scalar value and the right shift operation is equal to the scaling factor;
• receiving, in the encoded point cloud data, a second syntax element;
• for the point of the point cloud, determining a second residual value based on the second syntax element;
• for the point of the point cloud, determining a second attribute value for a second component based on a second predicted value, the second residual value, and the predicted second residual value.

A device for encoding point cloud data to generate encoded point cloud data, the device comprising:

• a memory configured to store the point cloud data;
• and
• one or more processors, implemented in circuitry, and configured to:
• for a point of a point cloud, determine a first attribute value for a first component;
• encode the first attribute value for the first component as a first predicted value and a first residual value;
• for the point of the point cloud, determine a second attribute value for a second component;
• determine a second predicted value for the second attribute value for the second component;
• determine a second residual value for the second attribute value for the second component;
• apply a scaling factor to the first residual value to determine a predicted second residual value, wherein the scaling factor has a non-integer value, wherein to apply the scaling factor to the first residual value, the one or more processors are further configured to:
• perform a multiplication by a scalar value;
• and
• perform a right shift operation, wherein a result of a combination of the multiplication by the scalar value and the right shift operation is equal to the scaling factor;
• and
• generate, for inclusion in the encoded point cloud data, a syntax element indicating the scalar value.