![]() In this article, we describe our approach to testing computational bokeh on smartphones. We now test shallow depth-of-field simulation (so-called bokeh modes) in a laboratory setup, looking at both the quality of the bokeh (depth of field and shape), as well as at the artifacts often induced when isolating a subject. This is why we decided to include tests for this new feature in our updated DxOMark Mobile testing protocol. This all said, the scene is currently shifting, with smartphone manufacturers working on ways to computationally simulate the shallow depth of field and bokeh that DSLR cameras and lenses can provide. The third smartphone image adds computational bokeh to the mix, achieving a result that is pretty close to the DSLR. The second was captured on a device with secondary tele-lens, resulting in a better portrait perspective, but still maintaining a very sharp background. The first smartphone image has a sharp background, distracting from the subject. ![]() The portrait image on the left was captured with a consumer DSLR, the others on smartphones. The difference between DSLR and smartphone portraits is immediately obvious - even to people who are not photography experts. With their small image sensor, they produce an almost infinite depth of field, rendering the background almost just as sharp as the subject itself. Smartphones, on the other hand, struggle to blur the background in an image. Thanks to the laws of physics, this is easily achieved with a fast lens on a full-frame sensor camera. In portrait photography, a photographer will typically accentuate the subject by capturing it in front of an out-of-focus background. However, there is one type of photography that has so far firmly remained in the domain of DSLRs and other large-sensor camera systems: portraiture. Even some professional photographers and journalists on occasion use the device in their pocket for paid assignments. Add ultimate portability to the mix, and it is no surprise that smartphones have become very popular among amateur documentary, landscape, and street photographers. Thanks to innovative technologies such as dual cameras and multi-image stacking, modern smartphone cameras can match traditional cameras in many areas.
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