In order to overcome the shortcomings of traditional vision methods in the field of vehicle driving assistance, include visible light imaging system is vulnerable to the influence of illumination conditions and small field of view (FOV) imaging system has a large blind area, this paper proposed an environmental perception method based on ultra-wide FOV infrared imaging system. However, due to the compression of the Ultra-wide FOV infrared lens, the target occupies fewer pixels, and the detection distance is greatly limited. Therefore, this paper studies the feasibility of the application of Ultra-wide FOV infrared imaging system in the vehicle auxiliary driving system from the road objectives imaging size. Firstly, the general model of fisheye camera is used to build the imaging model of the Ultra-wide FOV infrared camera. Then, the vehicle driving safety distance and pedestrian imaging size characteristics are analyzed. Then the pedestrian detection distance of the Ultra-wide FOV infrared imaging system is simulated theoretically. Finally, a set of Ultra-wide FOV imaging system, which the FOV is 143° × 106° FOV and the detector resolution is 800 × 600, is used to carry out the experiment. The experiment shows that the pedestrian detection distance of the system proposed in this paper is more than 100 m, which can meet the needs of assistant driving at medium and low speeds.
The glycerol used as an enhancer for tissue optical clearing technique has been researched. However, using it and a
physical way of ultrasound enhance optical clearing of tissue reported a few. We researched that the ultrasound whether
can improve the optical clearing of dealt with 80% glycerol tissue. The fresh porcine skins divided into four groups. The
first group was not dealt with by ultrasound and 80% glycerol, the second group was dealt with by only ultrasound, the
third group was dealt with by 80% glycerol and no by ultrasound, and the fourth group was dealt with by both 80%
glycerol and ultrasound. And we measured changes in optical scattering of the porcine skins under treatment with OCT.
From the OCT images show that the fourth group changed very faster than the other's during the 0~15 min. And it can be
clearly seen that there is a significant improvement in the light penetration depth and imaging contrast in a shorter time.
It is possible that the low-frequency ultrasound can make disordering of the stratum corneum lipids of the porcine skin
(because the cavitation has happened), and improve the speed of 80% glycerol through the stratum corneum of skin.
These results proved that using 80% glycerol with the ultrasound can better improve the optical clearing of tissue.
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