METHOD OF DETECTING VARIATION IN VIBRATION IN FIELD OF ELEMENT HAVING MANY-VALUED AMPLITUDE DISTRIBUTION, APPARATUS SUITABLE FOR EXECUTION THEREOF AND VIDEO SYSTEM CONTAINING THE SAME

摘要

PURPOSE: To attain the exactly decision of the position of amplitude fluctuation by positioning the amplitude fluctuation by the decision of interpolation on a relevant search curve despondently of at least three amplitude values on the search curve. CONSTITUTION: Assuming a picture is constituted of M picture lines constituted of N pieces of picture elements, for example 16 storage elements S1-S16 are connected through three delay elements for delaying by N-4 pieces of picture elements, and the storage elements include the circumstance of 44 picture elements. Whether or not an edge is related is decided in a directional circuit DL. This is executed in the same way by a normal edge detector. When difference between the total of gray levels G1-G8 of the storage elements S1-A8 and the total of gray levels G9-G16 of the storage elements S9-S16 is larger than a threshold value, the horizontal edge is related, and G1+G2+...+G8-G9-G10...-G16T is a limit. When the edge is detected by a detecting means, the position of the edge is further exactly decided by the calculation of interpolation points as the functions of the amplitude values of the 44 circumstance of amplitude inclination in a position circuit LL.