Method and system for automatically extracting position and profile of mark point in image

• Main Authors: WANG XIAONAN, ZHANG MENG, ZHENG SHUNYI, YE JIANFENG, ZHAO LIKE
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2016
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention relates to a method and a system for automatically extracting the position and profile of a mark point in an image. The method comprises the steps of obtaining an original image; performing median filtering processing on the original image; performing ellipse fitting processing on the mark point subjected to the filtering processing to obtain a preliminary extraction result; converting image point coordinates of points of an ellipse boundary of the preliminary extraction result into polar coordinates; and uniformly selecting the plurality of the points on the ellipse boundary to perform accurate extraction processing, and finally obtaining accurate data of the mark point. According to the method and the system, a mark point area in the image can be extracted automatically and more accurately based on preliminary extraction processing through accurate extraction processing, and a parameter equation of the mark point area is fitted out; and the extracted profile of the mark point can reach the sub