Journal of Guangxi Normal University(Natural Science Edition) ›› 2010, Vol. 28 ›› Issue (1): 170-173.

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An Improved Algorithm of Sub-pixel Offset

ZHOU Hong, LUO Xiao-shu, HE Fu-yun   

  1. College of Electronic Engineering,Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2009-10-20 Online:2010-03-20 Published:2023-02-07

Abstract: An improved sub-pixel offset algorithm is studied.Setting tangent threshold,the gradient direction of edge is determined by theratio and the positive or negative sign of partial differential.Then it inhibits pseudo-edgeof the identified single-pixel wide edge points in gradient image.Finally,it carries on the quadratic parabolic interpolation of gradient amplitude function alongits gradient direction,and calculate sub-pixel offset.Experimental results show that this algorithm has short running time and high detection accuracy and canbe applied to the industrial automation online fast image measurement tasks while in the condition of not very high precision.

Key words: sub-pixel offset, image measurement, edge thinning, gradient direction, parabolic interpolation

CLC Number: 

  • TP391.41
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