High-dynamic range video acquisition with a multiview camera

Jennifer Bonnard, Céline Loscos, Gilles Valette, Jean-Michel Nourrit et Laurent Lucas

We propose a new methodology to acquire HDR video content for autostereoscopic displays by adapting and augmenting an eight view video camera with standard sensors. To augment the intensity capacity of the sensors, we combine images taken at different exposures. Since the exposure has to be the same for all objectives of our camera, we fix the exposure variation by applying neutral density filters on each objective. Such an approach has two advantages: several exposures are known for each video frame and we do not need to worry about synchronization. For each pixel of each view, an HDR value is computed by a weighted average function applied to the values of matching pixels from all views. The building of the pixel match list is simplified by the property of our camera which has eight aligned, equally distributed objectives. At each frame, this results in an individual HDR image for each view while only one exposition per view was taken. The final eight HDR images are tone-mapped and interleaved for autostereoscopic display.

Mots clés

HDR images, HDR videos, multiview, pixel matching, autostereoscopic displays