Title :
Distortion correction in wide-angle images for picture-based food portion size estimation
Author :
Zhaoxin Li ; Mingui Sun ; Hsin-Chen Chen ; Jie Li ; Kuanquan Wang ; Wenyan Jia
Author_Institution :
Sch. of Comput. Sci. & Technol., Harbin Inst. of Technol. (HIT), Harbin, China
Abstract :
We have previously shown that food portion size can be measured using a wearable camera. Since the pictures of food are taken unintentionally in this case, a wide-angle lens is necessary to obtain a larger field of view. As a result, there is a considerable distortion in food images. This paper investigates an image undistortion method to improve the accuracy in food portion size estimation. We use a division model to represent the distortion effect of the wide-angle lens. Our experiment indicates that this method reduces the estimation error significantly.
Keywords :
biomedical equipment; cameras; image registration; medical image processing; patient monitoring; photographic lenses; distortion correction; estimation error; image undistortion method; picture-based food portion size estimation; wearable camera; wide-angle imaging; wide-angle lens; Accuracy; Cameras; Estimation; Lenses; Solid modeling; Three dimensional displays; Volume measurement;
Conference_Titel :
Bioengineering Conference (NEBEC), 2012 38th Annual Northeast
Conference_Location :
Philadelphia, PA
Print_ISBN :
978-1-4673-1141-0
DOI :
10.1109/NEBC.2012.6206922
