Dynamic depth-of-field projection mapping method based on a variable focus lens and visual feedback

Abstract

Dynamic projection mapping is an interactive display technology, which is capable with multiplayers with naked eyes for augmented reality. However, the fixed and shallow depth-of-field of the projector optics limits its potential applications. In this work, a high-speed projection mapping method with a dynamic focal tracking technology based on a variable focus lens will be illustrated. The proposed system included a high-speed variable focus lens, a high-speed camera, and a high- speed projector, so that the depth and rotation information would be detected and then served as feedback to correct the focal length and update the projection information in real time. As a result, the information would be well-focused projected even on a 3D dynamic moving object. The response speed of the high-speed prototype could reach around 5 ms, and the dynamic projection range covered from 0.5 to 2.0 m.

Projection mapping technologies: A review of current trends and future directions

“…The same setup also achieved a varifocal projector in which ETL’s focal length was constantly adjusted to match the target surface. 92 ) Although a large aperture ETL would be suitable for these systems, the response time of such ETLs is limited. The ETL is made of an optical fluid sealed off by an elastic polymer membrane.…”

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.…”