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

2012 ◽  
Author(s):  
Zhaoxin Li ◽  
Mingui Sun ◽  
Hsin-Chen Chen ◽  
Jie Li ◽  
Kuanquan Wang ◽  
...  
Keyword(s):  
Distortion Correction ◽  
Portion Size ◽  
Wide Angle ◽  
Size Estimation ◽  
Food Portion ◽  
Portion Size Estimation ◽  
Food Portion Size

scholarly journals A comparison of food portion size estimation by older adults, young adults and nutritionists

2017 ◽  
Vol 22 (2) ◽  
pp. 230-236 ◽  
Author(s):  
Claire Marie Timon ◽  
S. E. Cooper ◽  
M. E. Barker ◽  
A. J. Astell ◽  
T. Adlam ◽  
...  
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Portion Size ◽  
Size Estimation ◽  
Food Portion ◽  
Portion Size Estimation ◽  
Food Portion Size

scholarly journals Accuracy of estimates of food portion size using food photographs – the importance of using age-appropriate tools

2006 ◽  
Vol 9 (4) ◽  
pp. 509-514 ◽  
Author(s):  
Emma Foster ◽  
John NS Matthews ◽  
Michael Nelson ◽  
Julie M Harris ◽  
John C Mathers ◽  
...  
Keyword(s):  
Original Data ◽  
Portion Size ◽  
Size Estimation ◽  
Average Accuracy ◽  
Portion Sizes ◽  
Food Portion ◽  
Age Appropriate ◽  
Portion Size Estimation ◽  
Size Estimates ◽  
Food Portion Size

AbstractBackgroundIn order to obtain a measure of nutrient intake, a measure or estimate of the amount of food consumed is required. Weighing foods imposes a large burden on subjects, often resulting in underreporting. Tools are available to assist subjects in providing an estimate of portion size and these include food photographs. The application of these tools in improving portion size estimation by children has not been investigated systematically.ObjectivesTo assess the accuracy with which children are able to estimate food portion sizes using food photographs designed for use with adults, and to determine whether the accuracy of estimates is improved when age-appropriate portion size photographs are provided.DesignOriginal data from three separate studies, on the accuracy of portion size estimates by adults using food photographs, by children using adult photographs and by children using age-appropriate photographs, are analysed and compared.SubjectsOne hundred and thirty-five adults aged 18 to 90 years and 210 children aged 4 to 11 years.ResultsChildren's estimates of portion sizes using age-appropriate food photographs were significantly more accurate (an underestimate of 1% on average) than estimates using photographs designed for use with adults (an overestimate of 45% on average). Accuracy of children's estimates of portion size using age-appropriate photographs was not significantly different from that of adults. Children overestimated a food's weight by 18% on average and adults underestimated by 5%.ConclusionsProviding children with food photographs depicting age-appropriate portion sizes greatly increases the accuracy of portion size estimates compared with estimates using photographs designed for use with adults.

Food portion size estimation by men with Type II diabetes

1986 ◽  
Vol 86 (2) ◽  
pp. 249-251
Author(s):  
Stephen R. Rapp ◽  
Patricia M. Dubbert ◽  
Paul A. Burkett ◽  
Yvonne Buttross
Keyword(s):  
Type Ii Diabetes ◽  
Portion Size ◽  
Type Ii ◽  
Size Estimation ◽  
Food Portion ◽  
Portion Size Estimation ◽  
Food Portion Size

scholarly journals Validity of photographs for food portion estimation in a rural West African setting

2008 ◽  
Vol 11 (6) ◽  
pp. 581-587 ◽  
Author(s):  
L Huybregts ◽  
D Roberfroid ◽  
C Lachat ◽  
J Van Camp ◽  
P Kolsteren
Keyword(s):  
West African ◽  
Portion Size ◽  
Rural Setting ◽  
Group Level ◽  
Size Estimation ◽  
Childbearing Age ◽  
Food Items ◽  
Food Portion ◽  
Mean Differences ◽  
Food Portion Size

AbstractObjectiveTo validate food photographs for food portion size estimation of frequently consumed dishes, to be used in a 24-hour recall food consumption study of pregnant women in a rural environment in Burkina Faso. This food intake study is part of an intervention evaluating the efficacy of prenatal micronutrient supplementation on birth outcomes.SubjectsWomen of childbearing age (15–45 years).DesignA food photograph album containing four photographs of food portions per food item was compiled for eight selected food items. Subjects were presented two food items each in the morning and two in the afternoon. These foods were weighed to the exact weight of a food depicted in one of the photographs and were in the same receptacles. The next day another fieldworker presented the food photographs to the subjects to test their ability to choose the correct photograph.ResultsThe correct photograph out of the four proposed was chosen in 55% of 1028 estimations. For each food, proportions of underestimating and overestimating participants were balanced, except for rice and couscous. On a group level, mean differences between served and estimated portion sizes were between −8.4% and 6.3%. Subjects who attended school were almost twice as likely to choose the correct photograph. The portion size served (small vs. largest sizes) had a significant influence on the portion estimation ability.ConclusionsThe results from this study indicate that in a West African rural setting, food photographs can be a valuable tool for the quantification of food portion size on group level.

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