| 研究生: |
張言彬 Chang, Yen-Pin |
|---|---|
| 論文名稱: |
兼具五軸抑振與雙鏡頭自動對焦之擴增尺度手機相機新型設計 Novel Design of Augmented-Scale Camera Embedded in Mobile Phone for 5-axes Image Stabilization and Auto-Focus of Bidirectional Lens |
| 指導教授: |
蔡南全
Tsai, Nan-Chyuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2016 |
| 畢業學年度: | 105 |
| 語文別: | 中文 |
| 論文頁數: | 155 |
| 中文關鍵詞: | 光學影像穩定 、五軸抑振 、自動對焦 、磁致動器設計 |
| 外文關鍵詞: | 5-DOF vibration suppression, Auto-focus, Magnetic actuators, Optical Image Stabilization (OIS) |
| 相關次數: | 點閱:80 下載:4 |
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本研究針對內嵌於手機之新型相機之抑振與對焦目的,設計並製作一組擴增尺度驗證裝置,以檢視相機鏡頭之自動對焦響應,並使用光學影像穩定(Optical Image Stabilization)的方法使本研究設計之鏡頭擁有五個自由度的影像穩定化效能。 本實驗機構共分為六層子結構,每層子結構的機構搭配一至兩組磁致動器與霍爾感測元件並且僅能在一個自由度上面做移動或轉動。 本研究之整體機構結構層與結構層之間由內而外層層包覆,內層子結構的運動不會影響到外層子結構的運動,而外層子結構的運動會帶動其所有內層子結構沿其中一個自由度方向上運動(泛指線性移動或旋轉)。 其中,最內層子結構包含兩組鏡頭模組,分別為前鏡頭模組與後鏡頭模組,本研究設計將此兩組鏡頭模組整合在同一層子結構當中,使最內層子結構中的兩組鏡頭模組能夠分別面向 與 的方向,沿著 軸移動以實現自動對焦的功能。 其中,定義 軸的方向為前鏡頭模組由機構內部向外移動的方向,而 軸則為鏡頭模組往上的鉛垂方向。 除此之外,最內層子結構以外的其他五層子結構,能夠分別帶動最內層的鏡頭模組在對 軸與 軸的線位移(Linear Translation)以及繞 軸、 軸、 軸旋轉偏擺的角度旋轉(Roll Angle, Pitch Angle, Yaw Angle)等五個自由度的方向上運動,以實現五軸抑振的功能。 本研究對此一新型擴增尺度之手機相機鏡頭控制機制,進行(1)五軸抑振功能,(2)雙鏡頭自動對焦功能,(3)五軸抑振與自動對焦功能整合之實驗驗證。 透過上述實驗結果顯示,本研究之新型擴增尺度之手機相機鏡頭控制機制的抑振功能可以壓制頻率約為2Hz的外擾,使其誤差率維持在6%以內,自動對焦的功能則是可以使前後鏡頭模組分別花了11.8秒與12.6秒移動到最佳的對焦位置。 最後,經由五軸抑振與自動對焦功能整合之實驗,可以使本研究系統判定在有外擾時,進行五軸抑振功能;在無外擾時,進行自動對焦功能,在本論文之五軸抑振與自動對焦功能整合之實驗中,前後近頭模組分別花了37.7秒與38.9秒移動到最佳的對焦位置。
A novel design on camera embedded in cell phone is presented in both vibration suppression in five Degrees Of Freedom (DOFs) and bi-lens auto-focus realization. The aforesaid 5 DOFs include: angular position deviations ( , , ) along X-axis, Y-axis and Z-axis respectively, and linear position deviations (y, z) along Y-axis and Z-axis respectively. -axis is defined as the direction of the front camera to stretch out, while -axis the upwards vertical direction. The proposed device, in onion-alike design, is composed by six layers while each layer is moved by one to two magnetic actuators, which apply the optical image stabilization (OIS) approach to control image sensor and lens module to specific positions and directions. By the proposed design, the outside layer would impose the inside layers to move together, but on the other hand, the inside layer would not affect the motion of the outside layers. The innermost layer consists of two camera modules: backward camera module and forward camera module, which have been integrated into a single layer. It dominates the implementation of auto-focus action in the direction of either or axis. On the contrast to the innermost layer, the other five layers dominate the motion of camera module along the 5-DOF directions and account for the external vibration disturbance.
[1] Texas Instruments, “LMD18200 3A/55V H-Bridge”, LMD18200 Datasheet, 2013.
[2] Intel Corporation, Willow Garage, Itseez, “OpenCV Library Documentation”, 2000.
[3] A. Rosebrock, “Blur Detection with OpenCV”, Pyimagesearch, 2015. Retrieved from http://www.pyimagesearch.com/2015/09/ 07/blur-detection-with-opencv/#
[4] J. L. Pech-Pacheco, G. Cristobal, J. Chamorro-Martinez, J. Fernandez-Valdivia, “Diatom autofocusing in brightfield microscopy: a comparative study”, Pattern Recognition Proceedings 15th International Conference, Vol. 3, pp. 314-317, 2000.
[5] J. Baina, J. Dublet, “Automatic Focus and Iris Control for Video Cameras”, Fifth International Conference on Image Processing and its Applications, pp.232-235, 1995.
[6] N. Kehtarnavaz, H.-J.Oh, “Development and real-time implementation of a rule-based auto-focus algorithm,” Real-Time Imaging, Vol. 9, pp. 197-203, 2003
[7] J. Baina, J. Dublet, “Automatic Focus and Iris Control for Video Cameras”, Fifth International Conference on Image Processing and its Applications, pp.232-235, 1995.
[8] F. L. Rosa, M. C. Virzì, F. Bonaccorso, M. Branciforte, “Optical Image Stabilization”, STMicroelectronics White Paper, 2015.
[9] D. Vaquero, N. Gelfand, M. Tico, K. Pulli, M. Turk, “Generalized Autofocus”, IEEE Workshop on Applications of Computer Vision, pp. 511-518, 2011.
[10] E. Krotkov, “Focusing”, International Journal of Computer Vision, 1987.
[11] InvenSense, “Electronic Image Stablization”, 2016.
[12] ROHM Semiconductor, “Optical Image Stabilization”, ROHM Semiconductor White Paper, 2015.
[13] 作者不詳。 影像穩定方法比較暨安森美半導體光學影像穩定方案。 自動化在線論壇,2013。 取自: http://3g.autooo.net/utf8-classid77-id119413.html
[14] M. J. Chung, “Development of compact auto focus actuator for camera phone by applying new electromagnetic configuration,” Proc. SPIE, 6048,60480J , 2005.
[15] C.-S. Liu, P. D. Lin, “A miniaturized low-power VCM actuator for auto-focusing applications”, Optics Express, Vol. 16, pp. 2533-2540, 2008.
[16] R. J. Topliss, Campbell, CA(US), “VCM OIS Actuator Module”, APPLE INC Patent, Patent Application Publication US 2014/0009631 A1, 2014.
[17] Canon Corporation, “Canon Product: Canon Dual Pixel CMOS AF”, Canon Imaging Plaza, 2014.
[18] HTC智慧型手機產品目錄。 取自: http://www.htc.com/