Tag Archives: ios

HidNSeek iPhone app is out, Android on his way

A few week ago I’ve announced that I’ve started to help HidNSeek in their great attempt to provide a low consumption GPS tracker. As a member of the project, I’ve take part of the client and server backend. The first results are here: the HidNSeek app is available on the App store and the Android version is on the way.
The backend is based on the OpenSensorCloud platform (OpennSensourCloud.com) and handle all the interaction between the devices and the Sigfox network.
The client is a mobile application, that could interact with your device. You can create alert on Geofencing area, motion, you can get the latest positions of the device, and it is fully customizable with nice picture of what you are tracking. The App is already available on the App Store.

Simulator Screen Shot 24 oct. 2015 19.41.51

Simulator Screen Shot 24 oct. 2015 19.42.29

Simulator Screen Shot 24 oct. 2015 19.41.23

Simulator Screen Shot 24 oct. 2015 19.41.06

Fast Gaussian Blur alogrithm (on iPhone)

I had to implement a Gaussian Blur for an ihpone project, and the direct approach was really slow. For each point, you compute a rxrx4 pixels for each point (r is that rayon of the blur).

I’ve tried several other approach, but I found the stackblur alorgirthm. The idea of the stackblur is instead of recomputed all the neighbouround points for each new points, you juste maintain a stack of value, and remove/add value on the fly.

The source code is availabe on git hub with a sample project:

The source code is adpated from the Mario Kingemann algorithm, check his web site, full of good stuff