Trying the BioID Web Service REST API with Windows PowerShell

PowerShell promptIn a recent blog post we described how to interact with the BioID Web Service (BWS) RESTful API as an Client App with the cURL command line tool. While this tool is common on UNIX and akin systems the PowerShell is the default scripting environment on Microsoft Windows systems.

Thus we repeat the walk through from the blog post Trying the BioID Web Service REST API with cURL with the equivalent Windows PowerShell commands here. The cmdlets we use for this example require at least Windows PowerShell 3.0.

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Trying the BioID Web Service REST API with cURL

First contact

Unix Shell Prompt

Let's try to do some hands-on REST with the BioID Web Service (BWS). You'll need to already have requested a trial instance. Then you can go to the BWS Management portal and register a client app. I did this and got an email telling me that it runs on storage bws with in partition 9184. After having created it I can see that it appears in the “Client Apps” tab with the identifier The app name is something you can choose yourself when registering a new one.

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Browser Wars

HTML5 is great! Finally we can get rid of proprietary third party plugins like Adobe Flash Player or Microsoft Silverlight for media content.

Well, it's not that easy. Modern HTML5 capable browsers support presenting rich media in various formats but when it comes to capturing media, e.g. from a camera or microphone the browser support is thin on the ground.

And for the Identify operation we rely on the Microsoft Silverlight plugin at the moment for accessing the BWS via SOAP. Unfortunately it's getting more and more difficult to use the Microsoft Silverlight plugin in modern browsers.

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Prepare your samples!

Time for an follow-up on image samples upload. The efficiency of your application using the BioID Web Service (BWS) is highly dependent on the quality of your samples.

We have some recommendation about the characteristics of image data. The BWS does an quality check on all image data sent to the service. Only if the check succeeds the sample is processed further.

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Upside down, boy you turn me

  • Friday, September 27, 2013
  • BWS Support

Be aware that the BioID Web Service (BWS) does not auto-rotate images if the EXIF tag information is missing or wrong!

The EXIF (Exchangeable Image File Format) data of an image may contain the orientation of the camera while the image was taken. This is often the case if the device has an orientation sensor built in which is common in smart phones or tablets or digital cameras. Image viewing software and apps use this tag to rotate the image so that the top of the image is shown at the top of the display regardless of the orientation the camera had while taking the picture.

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BioID Identity Hidden Gems

At BioID Identity on the BioID Playground you can try out enrollment, verification and identification of our BioID Web Service (BWS).

On the corresponding pages on Playground there's a Microsoft Silverlight control embedded to record images and audio for the biometric traits face and voice. You can also upload samples from your local disk if you don't have a web cam or microphone connected (or no Silverlight installed) but in this blog post we want to explain some features of the control you may not have noticed yet.

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