Image segmentation is an important preprocessing operation in image recognition and computer vision. This paper proposes an adaptive K-means image segmentation method, which generates accurate segmentation results with simple operation and avoids the interactive input of K value. This method transforms the color space of images into LAB color space firstly. And the value of luminance components is set to a particular value, in order to reduce the effect of light on image segmentation. Then, the equivalent relation between K values and the number of connected domains after setting threshold is used to segment the image adaptively. After morphological processing, maximum connected domain extraction and matching with the original image, the final segmentation results are obtained. Experiments proof that the method proposed in this paper is not only simple but also accurate and effective.

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With the increasing number of obese or overweight people, healthy diet has become a hot topic. Most of the health management software on the market lacks the function of estimating food nutrition, which causes users to be unable to accurately understand their own diet. Based on the food volume calculation method, a mobile phone estimating system that uses the combination of Client-Server and database to estimate food nutrition is designed and realized in this paper. It provides personalized dietary and nearby restaurants recommendations based on daily meals and physical indicators, which not only greatly increased the accuracy of food nutrition estimation, but also is convenient and quick.