| 摘要: | 本計畫提出自動駕駛汽車監控系統光學設計之二年期計畫，第一年計畫為監控系統三顆不同焦距鏡頭設計，分別為長、中、短之車前距離之影像監控。本計畫三顆鏡頭設計所選感測器都為Sony二千萬畫素，而長距離影像監控光學系統之規格為物距70 m至150m，F/2.0，焦距29.856 mm，半視角為15度；中距離影像監控光學系統之規格為物距30 m至70 m，F/2.0，焦距17.156 mm，半視角為25度；短距離影像監控光學系統之物距規格為小於30 m，F/2.0，焦距5.477 mm，半視角為70度。一般在白天可同時記錄可見光波長範圍(0.4 um至0.7um)之長、中、短不同物距即時影像，而在晚上照明光線不足時，可加入近紅外線光源(0.75 um至0.95 um)作為補助光源。第二年計畫為可視穿視網膜投影機光學系統設計，可把三鏡頭影像經由投影機播放提供給駕駛員觀看，可視穿視網膜投影機共分為二個部份，分別是成像系統、照明系統。成像系統為一組目鏡系統，具有12度的半視角，功能為把顯示面板上的影像當作物，讓人眼直接觀察到顯示面板影像而不需要屏幕，再利用分光鏡來做為結合外界影像與面板影像，以達到可視穿的效果；照明系統的部分，使用RGB LED為光源，透過準直鏡、透鏡陣列均與集光鏡光來達到均勻化的效果。本計畫會加入因溫度所產生之鏡片折射率變化(dn/dT)、鏡片與鏡筒熱脹冷縮現象，所以會針對在溫度-20度C至60度C之熱處理與消熱差校正。本計畫也考慮鏡頭雜散光分析並降低其雜散光，可提高鏡頭品質。 ;This plan proposes autonomous car surveillance system will be designed for 2 years project. First year will focus on the design of three camera lenses, which consist of long, middle, and short-range focal lens design. For camera sensor, Sony’s 20 megapixels sensor will select for all three cameras. The optical design specifications for long-range camera are: Object distance 71m - 150m, F/2.0, focal length 29.856mm, Half field-of-view(HFOV) 15 degree. The optical design spec for middle-range camera are: Object distance 30m - 70m, F/2.0, focal length 17.156mm, HFOV of 25 degree, and short-range camera: Object distance under 30m, F/2.0, focal length 5.744mm, HFOV of 70 degree. As a result of trifocal designed cameras, it will be able to record long, middle, and short range images simotaniously under normal day light (visible wavelength range of 0.4 um- 0.7um), and during night time using infrared lighting ( wavelength range of 0.75 um- 0.95um.) as auxiliary light source. Second year of this plan will focus on the design of wearable see-through retinal projector, which projects the images captured by trifocal camera, and it is divided into two portions: image system and lighting system. Image system is a set of eyepiece that is HFOV of 12 degree. The function allows human eyes to see it without an actual display screen. Then uses a Beam splitter to combine the outside image with panel to achieve see-though effect. For lighting system, RGB LEDs will be use as light source, and use an array of collimators and lens to evenly distribute the light. This project will also address the issue of change in the refractive index (dn/dT) and thermal expansion/contraction on the lens/barrel due to temperature changes. Therefore, correction will be performed when environment temperature is between -20 degree Celsius - 60 degree Celsius. This project also considers stray light of lens analysis and reduces its stray light, can improve the lens quality. |
