Quality-guided phase unwrapping for the modified Fourier transform method

2009 ◽  
Author(s):  
Hong Guo ◽  
Peisen Huang
Keyword(s):  
Fourier Transform ◽  
Phase Unwrapping ◽  
Transform Method ◽  
Fourier Transform Method

Grayscale Image Acquisition for Raised Characters Based on Grating Image

2014 ◽  
Vol 678 ◽  
pp. 180-184
Author(s):  
Xue Yong Li ◽  
Yun Dong Liu ◽  
Guo Liang Lu
Keyword(s):  
Fourier Transform ◽  
Rational Design ◽  
Vision System ◽  
Image Acquisition ◽  
Phase Unwrapping ◽  
Design Phase ◽  
Grayscale Image ◽  
Transform Method ◽  
Fourier Transform Method ◽  
The Fourier Transform

This paper presents a novel image acquisition technology for colorless raised characters. First, a grating image modulated with the height information of raised character is captured through a vision system; then, the Fourier transform method is used to get the phase of the grating image; finally, a rational design phase unwrapping method is designed to reconstruct the grayscale image of raised characters. Experiments show that the proposed method can get the well-separated images of raised characters.

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