Display of 3D Holoscopic content on ... - Brunel University

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ICT Project <strong>3D</strong> VIVANT– Deliverable 6.4 Contract no.: 248420 <strong>Display</strong> <strong>of</strong> <strong>3D</strong> <strong>Holoscopic</strong> Content on Auto-stereoscopic <strong>Display</strong> Figure 8: Micro-lens array in integral ray tracing. The structure <strong>of</strong> the lenses and the camera model in the in <strong>3D</strong> <strong>Holoscopic</strong> computer graphics affects the way primary rays are spawned as well as the spatial coherence among them. The camera model used for each micro-lens is the pinhole approximation, where each micro-lens acts like a separate camera. The result is a set multiple cameras. Each <strong>of</strong> them records a micro-image <strong>of</strong> the virtual scene from a different angle (See figure 9). Primary rays pass through the centre <strong>of</strong> the micro-lens and the image plane. The scene image straddles the micro-lens array. Therefore there are two recording directions, in front and behind the micro-lens array. Figure 9: Camera model <strong>of</strong> <strong>3D</strong> <strong>Holoscopic</strong> imaging for computer graphics. The specific characteristics <strong>of</strong> <strong>3D</strong> holoscopic imaging, allows us to deal with each cylindrical lens separate from the others, and to measure the number <strong>of</strong> pixels behind each lens, focal length and the image width. All these parameters including the number <strong>of</strong> lenslets in the virtual cylindrical array are selected on the basis <strong>of</strong> the characteristics <strong>of</strong> the display device. The pixels intensity values <strong>of</strong> the micro-image for each lenslet are read, saved, and then mapped to 10
ICT Project <strong>3D</strong> VIVANT– Deliverable 6.4 Contract no.: 248420 <strong>Display</strong> <strong>of</strong> <strong>3D</strong> <strong>Holoscopic</strong> Content on Auto-stereoscopic <strong>Display</strong> pixels locations on the screen so that all the vertical slots are displayed at the same time forming the <strong>3D</strong> holoscopic image. The location <strong>of</strong> the vertical elemental image on the computer screen is identical to the location <strong>of</strong> the corresponding lenslet in the virtual lenses array. Figure 10 shows the <strong>3D</strong> scene “cutlery” rendered in OpenGL. The scene was first built in <strong>3D</strong> max, and then exported by OpenGL via Blender and saved as MD2 files. Each object in the scene was exported, saved and uned as a separate MD2 file. Figure 11 shows the <strong>3D</strong> holoscopic image resulting from the projection <strong>of</strong> the scene through the virtual lenticular lens array. Figure 10: Cutlery scene in OpenGL. Figure 11: Cutlery scene in OpenGL after projection through a virtual lenticular lens array. 4. DISPLAY OF <strong>3D</strong> HOLOSCOPIC CONTENT ON MULTIVIEW STEREO DISPLAYS Original experimentations was carried out on the Philips multiview auto-Stereoscopic display has been studied and experimented as an example <strong>of</strong> commercially available <strong>3D</strong> displays. A 20-inch <strong>3D</strong> 11
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Display of 3D Holoscopic content on ... - Brunel University

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