Patent ID: 11907283
Assignee: ALIBABA GROUP HOLDING LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. An apparatus comprising:
one or more processors;
memory;
a determination module stored in the memory and executable by the one or more processors to execute a corresponding window query input to determine a target pixel resolution corresponding to a query window according to a raster data access request;
a judging module stored in the memory and executable by the one or more processors to calculate a sampling level according to the target pixel resolution and a stored pixel resolution of a raster object, and determine whether the sampling level is greater than a threshold;
a first access module stored in the memory and executable by the one or more processors to access raster data corresponding to the query window according to a column-level index if the sampling level is greater than the threshold, the column-level index being an index generated by down-sampling according to raster data of the raster object in a column; and
a column index generation module stored in the memory and executable by the one or more processors to perform a splicing operation on pixel matrices of a root node of a row-level index of the raster object, perform a down-sampling operation on an obtained splicing result matrix, and generate the column-level index according to a down-sampling result, before executing the corresponding window query input to determine the target pixel resolution corresponding to the query window according to the raster data access request.