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How hot is your image?

Have you ever wondered how forensic investigators can determine the temperature your phone or camera was at when you took a specific image?

Many readers would know of wonders of metadata, however, with the applications of social media deleting this all important information to save space many are left in the dark with how to determine important forensic information.

In my latest paper in the Australian Journal of Forensic Sciences I describe a novel method for determining the temperature as described above without the use of image metadata. I do this by relying on a fundamental physical principal of how photosensors (the bit that captures the image) operate. Depending on the temperature the sensor is out, the noise profile of the camera will shift outputting more current due to a phenomenon we refer to as dark current. This refers to the current that is always being output by an image sensor, even when it is not illuminated by light. The full details are in my paper and I would encourage you to read it.

For publishing with Taylor and Francis I have 50 copies of my paper to give away for free. Click on the following link to access, or access via your institutions repository.


Astute readers would note that this is the final copy of my pre-print of the same title that is already in print in the preprint archive arXiv. There are notable additions to the paper as accepted in the Australian Journal of Forensic Sciences, namely the inclusion of tighter analysis and applications of this new method.

This research is currently at a TRL2; application formulated but not tested. Further work is required to bring it to a level ready for widespread forensic use.

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