A web-based image viewing library that tracks pinch zoom gestures when used on mobile. We present this as a proxy to eye-tracking that can be deployed as a crowdsourced task, and leverages the mobile screen as a restricted viewing window.
A running web demo of this interface is available here.
If you use this code, please consider citing:
Newman, A., McNamara, B., Fosco, C., Zhang, Y.B., Sukhum, P., Tancik, M., Kim, N.W., Bylinskii, Z. TurkEyes: A Web-Based Toolbox for Crowdsourcing Attention Data. In ACM CHI, 2020.
Here is how to get the example app running locally on your machine.
npm and MongoDB if you do not have them yet. Make sure MongoDB is running. By default, the interface will use the database at mongodb://localhost/zoommaps, but you can override this url by setting the environment variable $MONGODB_URI.npm install to install the dependencies. npm run dev to start the app in dev mode. This will start a local server at port 3000.There are two ways to run ZoomMaps:
npm run devnpm run build then npm startThe app expects two query parameters to be passed in the url:
workerId: the unique ID of the user (for instance, the workerId provided by Mechanical Turk)dataset: the name of the dataset to view. Should correspond to the name of a file in datasets/definitions, without the .json extension. For example, the url localhost:3000/?workerId=demo&dataset=natural_test points to a ZoomMaps gallery displaying the dataset "natural_test" for a participant with id "demo".
Collecting your own data will require 1) creating a "dataset" of your own images and 2) deploying the app to participants.
A "dataset" is a collection of images and experiment parameters that define the behavior of a ZoomMaps task. A dataset is specified by a "definition" file (see datasets/definitions), and its images are contained in a directory inside the folder datasets/images. For example, for the natural_test dataset of natural images, the definition file is located at datasets/definitions/natural_test.json and the images are located at datasets/images/natural.
We provide a script datasets/make-dataset.js that automatically generates a dataset definition file given a folder of images and a set of parameters. Run node make-dataset.js -h for usage information.
Set the environment variable $MONGODB_URI to specify the uri of the MongoDB database where ZoomMaps should save the data (defaults to mongodb://localhost/zoommaps). If you have a publicly accesible server that can run MongoDB, you can simply run the application in production mode and store the data on that server.
Alternatively, Heroku with the mLab MongoDB add-on provides a convenient option in the cloud. Simply set the value of $MONGODB_URI in your Heroku app to point to your mLab instance (should be of the form mongodb://username:password@hostport/database).
ZoomMaps can be deployed as an MTurk task using the ExternalQuestion task type. Crowdworkers view the ZoomMaps landing page within an MTurk iframe. The landing page contains a QR code and link that crowdworkers can open in a separate window on their mobile phone to open the ZoomMaps gallery. When they complete the task on mobile, crowdworkers receive a completion code that they enter on the landing page and submit back to MTurk as proof of completion. The requester can use the completion code to link the HIT back to data stored in the MongoDB database, if desired. See this iPython notebook for an example of how to deploy an MTurk task.
You can dump data from a MongoDB database to JSON by running mongoexport -h hostport -d database -c collection -u username -p password -o outfilename.