VIDEO SIGNAL TRANSMITTING DEVICEUSING IMAGE FRAME DIFFERENCE

PURPOSE: To express much more information with a little data by extracting motion not for the unit of a block but for the unit of a frame and expressing a transformed section with a border and a volume so as to facilitate the recognition of that transformed section. CONSTITUTION: A synthesizer 18 selects only a section corresponding to a 1st change detection mask from the source video of current frame. At an initial dividing part 19, the border is extracted by an object border tracing method for tracing the border section (contour section) of visually sensitive object. A motion detector 20 places the initially divided source video of current frame and a 2nd change detection mask while overlapping them, regards a section having the high ratio to be overlapped with the 2nd change detection mask as a really moving section and selects such a section out of initially divided areas. Then, a final dividing part 21 extracts an area simplified as a while by mutually joining areas which are precisely divided more than required although having similar characters. Further, the border information of final area simplified by the final dividing part 21 and volume information as the character in the area express the transformed section.