Currently LED as a light source is more and more widely applied, this paper presents an optical system design for LED source array base on a Fresnel lens array on a circular disc and a pair of circular mirrors that can compose of LED light together, forming a small area in the high luminance light source optical system can form a high power source system, this system can solve the heat dissipation problem of LED, and then the beam array are uniform, with no color aberration generated by this optical system. Such light source optical system can be used as the LED light source projector, high power shooting lamp, photography light, and many optical instruments such as super power point light source. The use of optical design software to optimize the design and calculation of optical parameters of circular and spherical mirror, based on beam analysis, realize the ideal LED light source array of a general set of optical system structure, can be used to design the others array light source.
This paper designed a large fisheye conversion lens work for digital projector, the lens work in many applications where users simply want to project a very wide angle onto the screen, such as simulation, immersive environments, and amusement parks. This lens can be applied to most of the current commercial projectors, and the projection ratio of the current commercial projector can reach 0.6 to 0.8: 1, the optical aperture is larger than the diameter of 220mm.
For LED light sources, attaching an optical system for light distribution is of great significance. The uneven illumination intensity at observe plane generated by the LED can’t reach the required degree everywhere. In order to achieve that, can only increase the overall power, which is a waste of resources. This paper designed an optical system to achieve rectangular uniform illumination. The relationship between the coordinates of freeform surface and the coordinate points of the target surface was established, and the differential equations that the free surface should satisfy were deduced, and got its numerical solution. Freeform lens is modeled and ray-traced. After analyzing the simulation results, the optical system basically achieves uniform rectangular lighting effects.
Omnidirectional videos are widely used in Virtual Reality applications. Omnidirectional videos are sphere in origin and need to be projected to a 2D-plane before coding and transmission. Common projection methods suffer from the overstretching in the polar areas which leads to the enormous decreasing of the omnidirectional video quality. In this paper, we proposed a novel representation based on pseudo-cylindrical projection. The representation is then reshaped and rearranged in the considering of several constraints including saving the pixel area and increasing viewing quality. The generation of our representation is formed as a multi dimension optimization problem. Our results across the test video sequences show significant coding gains over standard representations.
This paper described implementing the shadowless space by two kinds of methods. The first method will implement the shadowless space utilizing the semblable principles used in the integrating sphere. The rays from a built in light source will eventually evolve into a uniform lighting through diffuse reflections for numerous times, consider that the spherical cavity structure and the inner surface with high reflectivity. There is possibility to create a shadowless space through diffuse reflections. At a 27.4m2 area, illuminance uniformity achieved 88.2% in this model. The other method is analogous with the method used in medical shadowless lamps. Lights will fall on the object in different angles and each light will generate a shadow. By changing the position distribution of multiple lights, increasing the number of light sources, the possibility of obtaining shadowless area will gradually increase. Based on these two approaches, two simple models are proposed showing the optical system designed for the shadowless space. By taking simulation software TracePro as design platform, this paper simulated the two systems.