IMAGE CODING APPARATUS, IMAGE CODING METHOD, AND IMAGE CODING SYSTEM

摘要

Prediction directions for cost calculation are reduced by preferentially selecting a direction in which a prediction pixel is generated by direct copy without filtering from among intra prediction directions to perform intra prediction. In addition to the roughly selected prediction direction, an amount of processing is reduced while deterioration of coding efficiency is prevented through comparison with preferentially selected prediction, such as DC prediction and planar prediction, and selection of second-stage prediction direction focused on a vicinity of roughly selected prediction direction.

主权项

1. An image coding method for coding an current block included in an image, the image coding method comprising:
selecting a first prediction direction from a first prediction direction set that is part of a plurality of previously determined prediction directions, and includes one or more of the prediction directions; and performing intra prediction on the current block by using a pixel of an adjacent block that is adjacent to the current block based on the selected first prediction direction, wherein the first prediction direction is selected from one or more prediction directions included in the first prediction direction set, based on a prediction pixel generated by copying the pixel of the adjacent block, the prediction pixel being generated without filtering.