High-Speed Focal Tracking Projection Based on Liquid Lens

Beaming Displays

“…A sophisticated image warping based on head orientation speed can improve the perceived latency, yet requires fast head motion detection that is typically achieved by rotation encoding mechanism installed on the headset [25]. A high-speed projection mapping system is another engineering option to tackle this latency issue [37]. Infrared (IR) markers are typically used to avoid visually occupying visible markers [30].…”

“…A user can be located in different locations with respect to a steering projector, therefore the effective focal length of the second lens has to dynamically change, and with a separate mechanism, images have to be steered toward different locations. In the projection mapping researches, focusing a projector to an object moving in depth is tackled by using focus-tunable dynamic lenses [15,37], which leads to a considerable depth of fields in projection systems when the focal length is continuously swept rapidly in such lenses. Following the existing projection mapping research, we envision lens two in Fig.…”

Online Projector Deblurring Using a Convolutional Neural Network

“…These limitations had been overcome by applying a fast focal sweep projection technique with an electrically focus tunable lens (ETL), by which the PSF of each pixel becomes uniform over a wide depth range [24]. Another solution also applied the ETL by controlling it to keep focusing on a moving target whose position was tracked by a depth sensor [47]. In these techniques, the PSFs need not be estimated online even when the projection surface moves.…”

Dynamic projection mapping for non-planar objects with a variable focus lens

“…Although such markers are resistant to random occlusion, the technique is only ______________ Further author information: Lihui Wang: wanglihui@gdisit.com employed for dynamic projection of moving objects in 2D space. In addition, to address the problem of the limited depth of field range of projectors, Wang et al utilized the high-speed focus capability of variable focus lens [9][10][11][12][13][14] . It was able to capture changes in the object's distance and attitude through high-speed visual feedback technology, dynamically alter the liquid lens's focal length, and update the projected image in high-speed to correspond with the object's motion in longitudinal space.…”