Moving image coding device

摘要

This moving image coding device has an update region detection unit, a coding target region detection and cache update unit, and a coding unit. The update region detection unit compares a reference frame and a current frame, and detects an update region that a pixel value changed. The coding target region detection and cache update unit replaces an image of an update region in the reference frame with an image in a cache frame, and thereafter, detects a region that a pixel value changed as a coding target region and stores an image of a region that a pixel value did not change for a predetermined past period in the image of the update region in the reference frame before the replacement, into the cache frame as an image of a stable region. The coding unit codes an image of the coding target region and cache information.

主权项

1. A moving image coding device, comprising:
a reference frame memory configured to store a reference frame; a current frame memory configured to store a current frame; a cache frame memory configured to store a cache frame; an update region memory configured to store data relating to an updated region in a predetermined number of past frames; an unstable region memory configured to store information showing an updated region that has been updated within any frame in a predetermined number of past frames; a coding target region memory configured to store information showing a region to be coded in the current frame; an unstable region detection unit implemented by at least a processor that, when a frame of a video image to be coded is stored into the current frame, detects a region that has been updated within any frame in a predetermined number of past frames as an unstable region based on data being stored in the update region memory, and stores information showing the unstable region into the unstable region memory; an update region detection unit implemented by at least a processor and that compares the reference frame and the current frame, detects a region in which a pixel value has changed, as an update region of the current frame, and stores the detected update region into the update region memory; a cache exchange unit implemented by at a least a processor that exchanges a pixel value included in the update region of the current frame between the reference frame and the cache frame; a cache exchange information coding unit implemented by at a least a processor and that codes information of a region in which a pixel value has been exchanged by the cache exchange unit; an unstable update region detection unit implemented by at least a processor and that detects an overlap region between the unstable region and the updated region of the current frame as an unstable update region; a cache storage unit implemented by at least a processor and that stores a pixel value of the unstable update region of the reference frame into the cache frame; a cache storage information coding unit implemented by at least a processor that codes information of a region in which a pixel value has been stored from the reference frame into the cache frame by the cache storage unit; a coding target region detection unit implemented by at a least a processor and that compares the reference frame being processed by the cache exchange unit with the current frame, detects a region in which a pixel value has changed as a coding target region, and stores information of the coding target region into the coding target region memory; and an image information coding unit implemented by at least a processor that codes an image of the coding target region of the current frame.