WildCam: A Privacy Conscious Wearable Eating Detection Camera People Will Actually Wear in the Wild

Study Overview
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Brief Summary
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WildCam is a wearable device that collects video data of the user's face and upper torso to capture eating behaviors. WildCam and its accompanying software is privacy conscious, meaning it utilizes a computer vision algorithm that extracts proximal features (the user's body and objects-in-hand) from the video and digitally obfuscates the distal features (background environment and entities therein) to preserve the privacy of the wearer, as well as any bystanders who may be in the device's visual field. The present study tests the impact of 3 different obfuscation techniques on acceptability, including the willingness of users to wear the device. Participants are randomly assigned to 1 of the 3 obfuscation techniques (blurring, masking, or cartooning). Participants wear the WildCam during waking hours during a 7-day period with the randomly selected obfuscation setting enabled and a 7-day period with the raw images (no obfuscation) setting. The order of these periods is counterbalanced, and the two periods are separated by a 7-day washout period during which WildCam is not worn. Structured feedback, including user burden and acceptability surveys, is collected to determine the efficacy of each obfuscation technique on increasing user acceptability, including willingness to use the WildCam device, as opposed to a video-collecting device without obfuscation.

Official Title
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WildCam: A Privacy Conscious Wearable Eating Detection Camera People Will Actually Wear in the Wild

Conditions
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Wearable Electronic Devices

Intervention / Treatment
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* Device: Blur Obfuscation
* Device: Edge Obfuscation
* Device: Cartoon Obfuscation
* Device: Raw images


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: BMI 30 or greater Chicago Metro Area resident Able to speak, read, and write in English Valid phone number Smartphone ownership Have Wi-Fi at home Exclusion Criteria: 15% or greater weight change in last 3 months Medication related weight gain Genetic obesity syndrome (e.g., Prader-Willi, Bardet-Biedl, Cohen Syndrome) Member of household enrolled in study

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 64 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Of the 3 obfuscation settings (blur, mask, cartoon), participants are randomly assigned to 1, which they test for the first or second 7-day test period. During the remaining test period, participants use WildCam with the raw images setting. There is a washout period between each test period. The order of the test sequence is counterbalanced across participants to reduce carryover effects.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Blur obfuscation<br>Blurring is applied to objects and people in the background of images. | Device: Blur Obfuscation<br>* Blurring is applied to objects and people in the background of images.<br>|
| Experimental: Edge obfuscation<br>Objects and people in the background of images are replaced with an outline of the object. | Device: Edge Obfuscation<br>* Objects and people in the background of images are replaced with an outline of the object.<br>|
| Experimental: Cartoon obfuscation<br>Blurring is applied to objects and people in the background of images and the wearer's face is concealed with cartoon faces. | Device: Cartoon Obfuscation<br>* Blurring is applied to objects and people in the background of images and the wearer's face is concealed with cartoon faces.<br>|
| Experimental: Raw images<br>No editing is performed on images. | Device: Raw images<br>* No editing is performed on images.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean Wear Time | Average duration in minutes of data collected per day, calculated from video time stamps | 7 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acceptability | Score (0-80) obtained from User Burden Scale (Suh. et al 2016), collected post-study | 7 days |