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  本文選題：半虛擬鍵盤　切入點：圖像處理　出處：《華南理工大學》2013年碩士論文　論文類型：學位論文

【摘要】：隨著現(xiàn)代計算機技術(shù)的發(fā)展，諸如筆記本、智能手機、平板電腦等便攜式設(shè)備日益趨向功能集中化、小型化，而傳統(tǒng)鍵盤存在體積大、不方便攜帶的缺陷，手機鍵盤又限于按鍵尺寸過小不方便操作，這些阻礙了人機交互的舒適性與便攜性。由此，一種基于圖像處理技術(shù)，具有硬件少、體積小、方便攜帶等優(yōu)點的虛擬鍵盤成為解決上述問題的新型人機交互工具。 基于圖像處理技術(shù)的虛擬鍵盤，不需要鍵盤實體，通過攝像頭采集鍵盤區(qū)域圖像，經(jīng)圖像處理識別出按下的按鍵和用戶擊鍵的動作，用軟件產(chǎn)生按鍵命令，實現(xiàn)鍵盤的功能。在本文中，將按鍵通過投影產(chǎn)生的虛擬鍵盤稱為純虛擬鍵盤，將按鍵通過打印或絲印在其他物體上的虛擬鍵盤稱為半虛擬鍵盤。 從虛擬鍵盤的實現(xiàn)上講，其主要解決三個問題：鍵盤位置的定位，按鍵的識別和按鍵按下與釋放的模態(tài)識別。通過鍵盤4個頂點定位鍵盤區(qū)域的方法不夠準確，影響按鍵的識別精度，為此，本文提出了離線建模的方法，能夠定位到鍵盤的每一行。采用手勢識別、模型匹配或陰影分析等方法實現(xiàn)手指定位及擊鍵動作的識別，其算法受外界光線影響較大，效率不高，，很難在實際中應(yīng)用。為此，本文采用紅外激光作為輔助光源實現(xiàn)按鍵的定位及模態(tài)的識別。 本文首先介紹了虛擬鍵盤的國內(nèi)外研究狀況，在此基礎(chǔ)上闡述了本文的設(shè)計方法，介紹了半虛擬鍵盤系統(tǒng)。通過離線建模獲取鍵盤行列位置信息，以光斑定位指尖位置，再利用鍵盤行列信息識別目標按鍵，通過比較相鄰兩幀圖像的按鍵信息識別按鍵的模態(tài)，最終實現(xiàn)了鍵盤功能。最后對離線建模及按鍵效果做了實驗與分析，實驗表明本文設(shè)計的半虛擬鍵盤能夠快速、高準確度識別按鍵及其模態(tài)，受外界光線影響小，適于在實際中使用。
[Abstract]:With the development of modern computer technology, portable devices such as notebook, smart phone, tablet computer and so on tend to be centralized and miniaturized. The keyboard of mobile phone is limited to too small keystroke size to operate easily, which hinders the comfort and portability of human-computer interaction. Virtual keyboard, which is easy to carry and so on, has become a new human-computer interaction tool to solve the above problems. The virtual keyboard based on image processing technology does not need keyboard entity. The image of keyboard area is collected by camera, and the keystroke action is recognized by image processing, and the key command is generated by software. In this paper, the virtual keyboard generated by the key projection is called the pure virtual keyboard, and the virtual keyboard that the keys are printed or printed on other objects is called the semi-virtual keyboard. From the realization of virtual keyboard, it mainly solves three problems: the location of keyboard, the identification of keystroke and the modal identification of press and release of keystroke, the method of locating keyboard area through four vertices of keyboard is not accurate enough. This paper presents an off-line modeling method, which can locate every line of the keyboard. Hand gesture recognition, model matching or shadow analysis are used to realize finger positioning and keystroke recognition. The algorithm is greatly influenced by the external light, and its efficiency is not high, so it is difficult to be applied in practice. Therefore, the infrared laser is used as the auxiliary light source to locate the keys and identify the modes. This paper first introduces the research status of virtual keyboard at home and abroad, and then expounds the design method of this paper, introduces the semi-virtual keyboard system, obtains the position information of keyboard row and column by off-line modeling, and uses spot to locate finger tip position. Finally, the keyboard function is realized by comparing the modes of the keystroke information of the adjacent two frames. Finally, the off-line modeling and the effect of the keystroke are tested and analyzed. The experiments show that the semi-virtual keyboard designed in this paper can identify the keys and their modes quickly and accurately, and is less affected by the external light, so it is suitable for practical use.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP391.41;TP334.23

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