초록 ▼

A corner detector capable of detecting each corner position of a predetermined area from an input signal with a simple structure. There is provided memory means (9B) for storing memorizing an input signal (keyT) and corner detection means (9C) for detecting a point where the signal level becomes the

A corner detector capable of detecting each corner position of a predetermined area from an input signal with a simple structure. There is provided memory means (9B) for storing memorizing an input signal (keyT) and corner detection means (9C) for detecting a point where the signal level becomes the reference signal level or more at first by reading an input signal stored in the memory means sequentially in horizontal direction from an upper limit and a lower limit of a retrieval scope and in vertical direction from the left end to the right end of the retrieval scope, and detecting a point where the signal level becomes the reference signal level or more at first by reading an input signal stored in the memory means sequentially in a diagonal direction at a predetermined angle from each angle of the retrieval scope to detect from the detected points four points whose positions differ. With such means, each corner position of the area of the detection object can be detected with a simple structure and quickly.

대표청구항 ▼

[ What is claimed is:] [1.] A corner detection device for detesting from a retrieval scope of an input signal each corner position of an area of a square configuration where a signal level is set to a level higher than a level of a reference signal level, the device comprising:memory means for memor

[ What is claimed is:] [1.] A corner detection device for detesting from a retrieval scope of an input signal each corner position of an area of a square configuration where a signal level is set to a level higher than a level of a reference signal level, the device comprising:memory means for memorizing said input signal; andcorner detection means for detecting a point where the signal level of said input signal is at first set to a level higher than the level of said reference signal by reading from said retrieval scope upper and lower limits in a horizontal direction sequentially the input signal which is memorized in said memory means, and at the same time reading from the retrieval scope left and right ends in a vertical direction sequentially, and detecting a point where the signal level of said input signal is at first set to a level higher than the level of said reference signal by reading the input signal memorized in said memory means in a diagonal direction sequentially at a predetermined angle from each angle, and detecting four points whose positions differ from the detected points.