Friday, April 20, 2018

Bokode: Imperceptible Visual Tags

Current optical tags, such as barcodes, must be read within a short range and the codes occupy valuable physical space on products. We present a new low-cost optical design so that the tags can be shrunk to 3mm visible diameter, and unmodified ordinary cameras several meters away can be set up to decode the identity plus the relative distance and angle.

The design exploits the bokeh effect, a photographic term referring to the æsthetic quality of point-of-light sources in an out-of-focus area of an image produced by a camera lens using a shallow depth of field.
There are two types of Bokodes described in the paper, active tags than use a LED to light the Bokode pattern from behind, and passive tags that replace the LED behind the Bokode pattern with a retro-reflector and use the camera Flash as the illumination source.

The system is targeted for consumer applications, collaborative interfaces, and augmented reality mapping applications. You can read full copy of the paper describing the technology behind it.


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A research blog about interaction, design research, urban informatics, ambient computing, visualisation, emerging technologes and their impact on the built environment.

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This is a blog by Gonzalo Garcia-Perate a PhD researcher at The Bartlett, looking at adaptive ambient information in urban spaces.

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