DEVICE FOR DETECTING ANGLE DIFFERENCE BETWEEN PICTURES

摘要: PURPOSE:To improve the detecting speed of angle difference between two similar pictures, by compressing histogram data density gradient picture element value a and reducing calculating quantity. CONSTITUTION:The each constituting to be collated are recorded in an image memory 1 maximum changing direction is found space differentiating circuit 2 composed 3X3 differentiation window. Then produced 3. After change averaged means smoothing 4, feature quantities histogram, such as differ ence adjacent minimum, their difference, etc., extracted quantity compressed extracting 5. Thereafter, shifted shifting 7 compared with reference stored 6 at distance 8 found.