‘Modulo Camera’: researchers at the MIT are developing the HDR sensor


It is already the second time in the last month that scientists at the MIT have presented a new technology that might be able to make the life of every single photographer a lot easier. Less than two weeks ago a different team at the renowned university in Cambridge introduced an algorithm developed in cooperation with Google which can remove reflections and other annoying foreground elements from a photo. A few days ago the concept for a sensor with an unlimited Full-Well capacity was introduced. In simple terms, this is a sensor which makes overexposing an image impossible.


Image source: MIT


Image source: MIT

This is achieved by individually accessing the photodiodes on the sensor and resetting them if they are fully saturated (i.e. overexposed). This means that every “pixel” of the sensor can be exposed multiple times in the course of one exposure, with the image processor noting how many times individual “pixel” were reset. After the exposure is completed, the image processor receives a useable brightness-value from all photodiodes, including the ones which would have been saturated with a traditional sensor. Using the number of the “resets” and this final brightness-value, the processor can then completely restore the overexposed areas. The concept is called “Modulo Camera” and is based on a modular arithmetic. In the following video the way of functioning of the new sensors and the difference to conventional sensors are explained in an easily comprehensible way.

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