PREDICTIVE GEOMETRY CODING IN G-PCC

An example method of encoding a point cloud includes obtaining a value of a quadratic residual for geometric coding of a current prediction tree node of the point cloud; and encoding a value of a quadratic residual, where encoding the value includes: encoding a prefix bin of a syntax element having a value specifying an absolute value of the value of the quadratic residual minus 2 using a first set of context adaptive binary arithmetic coding (CABAC) contexts; and encoding the suffix bin of the syntax element using a second set of contexts different from the first set of CABAC contexts. 编码点云的示例方法包括获得用于对点云的当前预测树节点进行几何编解码的二次残差的值；以及对二次残差的值进行编码，其中对该值进行编码包括：使用上下文自适应二进制算术编解码(CABAC)上下文的第一集合对语法元素的前缀bin进行编码，该语法元素具有指定二次残差的值的绝对值减去2的值；以及使用不同于CABAC上下文的第一集合的上下文的第二集合对语法元素的后缀bin进行编码。