Title :
Accurate 3-D shape recovery using curved window focus measure
Author :
Yun, Joungil ; Choi, Tae S.
Author_Institution :
Dept. of Mechatronics, Kwangju Inst. of Sci. & Technol., South Korea
Abstract :
To improve the accuracy of 3-D shape recovery from image focus, a new shape from focus (SFF) method based on focused image surface (FIS) is proposed. The new SFF method, called the Curved Window Focus Measure (CWFM), uses piecewise curved search windows which track the realistic FIS in image space to compute the focus measure. The Nine Control Points (NCP) model is proposed to interpolate the piecewise curved window, and the matrix form of the Lagrange polynomial is derived as a surface equations appropriate for the NCP model. An automated CCD camera system has been developed to implement the CWFM search method. Experimental results show that our CWFM search method gives more accurate results than the previous SFF methods
Keywords :
image reconstruction; object recognition; optical focusing; CWFM search method; Lagrange polynomial; Nine Control Points; accurate 3D shape recovery; automated CCD camera system; curved window focus measure; focused image surface; image focus; interpolation; piecewise curved search windows; shape from focus; surface equations; Automatic control; Extraterrestrial measurements; Focusing; Frequency; Laplace equations; Lenses; Mechatronics; Pixel; Search methods; Shape measurement;
Conference_Titel :
Image Processing, 1999. ICIP 99. Proceedings. 1999 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-7803-5467-2
DOI :
10.1109/ICIP.1999.817287