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The Cherenkov Telescope Array (CTA) is a ground-based $\gamma$-rayobservatory that will observe the full sky in the energy range from 20 GeV to100 TeV from facilities in both hemispheres. It is proposed to consist of morethan 100 telescopes and the large amount of data produced will exceed thevolume of current VHE Imaging Atmospheric Cherenkov Telescopes by $\sim$twoorders of magnitude. This volume of data represents a new challenge to thecommunity, which is looking for new data formats to transfer and store the CTAdata. One of the prototypes currently under study is the ROI (Regions OfInterest) file format for camera images. It can store only those pixels of acamera image that are close to the shower, thus removing the major part of thenight sky background (NSB) while keeping all pixels that might belong to theshower. Simple on-the-fly compression is used to reduce the file size evenfurther. Here, we explain the ROI prototype in detail and present preliminaryresults when applied to simulations.

A Prototype Data Format for the Cherenkov Telescope Array: Regions Of Interest (ROI)