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The efficient storage of digital data is becoming very challenging over theyears due to the exponential increase in the generation of data which can'tcompete with the existing storage resources. Furthermore, the infrequentlyaccessed data can be safely stored for no longer than 10-20 years due to theshort life-span of conventional storage devices. To this end, recent studieshave proven DNA to be a very promising candidate for the long-term storage ofdigital data. Several pioneering works have proposed different encoding methodsfor the specific encoding of images into a quaternary DNA representation whilefirst compressing the image using the classical JPEG standard to reduce thehigh cost of DNA synthesis. However this type of compression is not optimizedwith respect to the quaternary DNA code and results in an open-loop workflow.In our previous works we have introduced the first closed-loop solution forgenerating a constrained fixed-length quaternary code which allows controllingthe synthesis cost thanks to a source allocation algorithm. In this paper, weextend our studies to proposing a variable-length encoding solution which isbased on the JPEG standard.

A JPEG-based image coding solution for data storage on DNA