Distortion correction in wide-angle images for picture-based food portion size estimation

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.

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