Patent ID: 8885730
Filing Date: 2014-11-11
Classification: H04N

Abstract:
1. An image coding method of coding a video signal to generate a coded video signal that is a bitstream, said method comprising: selecting, from at least one filter data element stored in a memory, respective filter data elements of one-dimensional component filters of two types that compose a two-dimensional separable filter as two application filter data elements, the one-dimensional component filters being to be applied to a filter-application image area indicated by the video signal; obtaining an index stored in the memory in association with a corresponding one of the selected two application filter data elements, as an application index, for each of the one-dimensional component filters; coding the filter-application image area by applying, to the filter-application image area, the one-dimensional component filters of two types using the two application filter data elements selected in said selecting; adding the two application indexes obtained in said obtaining to the coded filter-application image area in the coded video signal; identifying filter data elements of the one-dimensional component filters as two designed filter data elements, based on a filter-design image area including the filter-application image area and indicated by the video signal; assigning an index for identifying a corresponding one of the designed filter data elements to the corresponding one of the designed filter data elements as a designed index for each of the one-dimensional component filters; storing, in the memory, the designed filter data element and the designed index in association with each other, for each of the one-dimensional component filters, the designed index being assigned to the designed filter data element; and adding the two designed filter data elements identified in said identifying of filter data elements, to the coded filter-design image area in the coded video signal.