Autofocus measurement for imaging devices

Abstract

We propose an objective measurement protocol to evaluate the autofocus performance of a digital still camera. As most pictures today are taken with smartphones, we have designed the first implementation of this protocol for devices with touchscreen trigger. The lab evaluation must match with the users' real-world experience. Users expect to have an autofocus that is both accurate and fast, so that every picture from their smartphone is sharp and captured precisely when they press the shutter button. There is a strong need for an objective measurement to help users choose the best device for their usage and to help camera manufacturers quantify their performance and benchmark different technologies.

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“…It is noteworthy that, despite the continuous improvements on image acquisition process on most recent smartphones, just using the autofocus methods provided by the An-droid/iOS APIs is clearly insufficient, given that it is a fallible process and only allows developers to force the focus, not guaranteeing that the acquired image has the desired quality. In fact, very few studies researched the assessment of available auto-focus systems [14], the work in [15] being one of the first to propose an objective measurement protocol to evaluate autofocus performance of digital cameras.…”