ResearchResearch and Practice InnovationEvidence-Based Development of a Mobile Telephone Food Record
Section snippets
System Design
The client−server configuration for the mobile telephone food record is in Figure 1. In this system, a mobile telephone with an integrated camera can be used to capture images of food before and after eating and sent to the server (Figure 1, #1). A digital image is different from a photograph in that useful information, called metadata, is captured that is not visible, such as the time stamp and digital codes. Image analysis uses metadata to automatically identify characteristic features in
Results and Discussion
A total of 78 participants (26 males, 52 females) ages 11 to 18 years used the mobile telephone food record for a first meal and 70 of those also used the mobile telephone food record again for a second meal. Characteristics of the samples are in Table 1. The participants were either in middle school or high school, and the mean age was 14.2 years. The participants were of diverse ethnic backgrounds.
With regard to being able to acquire a useful image, the majority of the participants saved
Conclusions
Evidence-based development entails a shift from focusing on the product to focusing on the process and the interaction of the user with the product. Using this process will allow the design of the mobile telephone food record from the perspective of the user or the client rather than the perspective of the engineer or RD. Formative evaluation outcomes and user feedback are important components of evidence-based development used when designing applications (11). In the same way that
B. L. Six and T. E. Schap are research assistants in the Department of Foods and Nutrition, Purdue University, West Lafayette, IN.
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B. L. Six and T. E. Schap are research assistants in the Department of Foods and Nutrition, Purdue University, West Lafayette, IN.
C. J. Boushey is an associate professor in the Department of Foods and Nutrition, Purdue University, West Lafayette, IN.
F. M. Zhu, A. Mariappan, and M. Bosch are research assistants at the School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN.
E. J. Delp is The Charles William Harrison Distinguished Professor of Electrical and Computer Engineering at the School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN.
D. S. Ebert is a professor at the School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN.
D. A. Kerr is an associate professor, Health Innovation Research Institute, School of Public Health, Curtin Institute of Technology, Bentley, WA, Australia.