本文選題：快速視頻拼接 + 各向同性Sobel算子　； 參考：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：由于受自身廣角限制,單一攝像頭無(wú)法得到一系列清晰度較高的視頻圖像。為了更好地去解決單一攝像頭的缺陷,視頻拼接技術(shù)因此得到發(fā)展。伴跟著計(jì)算機(jī)技術(shù)深入研究,尤其是利用計(jì)算機(jī)視覺(jué)的行車(chē)智能系統(tǒng)、智能車(chē)載技術(shù)和主動(dòng)行駛的研究,實(shí)時(shí)捕獲到目標(biāo)物體360°范圍內(nèi)的視覺(jué)圖像,也正被各個(gè)領(lǐng)域的研究學(xué)者不斷的關(guān)注。本文針對(duì)快速視頻拼接算法的拼接性能以及拼接所呈現(xiàn)出的效果進(jìn)行了研究,重點(diǎn)在一下幾個(gè)方面展開(kāi)工作:(1)本文采用普通的CCD攝像頭組成視頻采集單元,多路攝像頭采集通道的同步問(wèn)題進(jìn)行了研究。同時(shí),本文對(duì)輸入視頻圖像進(jìn)行預(yù)先處理,消除因?yàn)橥獠抗饩�(xiàn)以及視角問(wèn)題產(chǎn)生的圖像質(zhì)量不高以及攝像頭本身產(chǎn)生畸變等問(wèn)題,有效的優(yōu)化了拼接質(zhì)量。(2)本文分析了基于傳統(tǒng)的Harris角點(diǎn)算法以及SIFT特征算法的配準(zhǔn)方法�；赟IFT特征的算法運(yùn)行準(zhǔn)確度高,但實(shí)驗(yàn)流程較為復(fù)雜,無(wú)法滿(mǎn)足快速視頻拼接;基于Harris角點(diǎn)的配準(zhǔn)算法,復(fù)雜度較低,實(shí)驗(yàn)運(yùn)行時(shí)間短。最后本文決定采用基于Harris角點(diǎn)的拼接算法,并對(duì)原始Harris存在特定點(diǎn)檢測(cè)準(zhǔn)確率低、運(yùn)行過(guò)程復(fù)雜等問(wèn)題,進(jìn)行了改進(jìn)和優(yōu)化,在不降低拼接質(zhì)量的同時(shí),加快了速度。(3)此外,在視頻融合方面,本文采用兩步處理的方法,通過(guò)分布處理,結(jié)合線(xiàn)性融合的方法,得到了可以應(yīng)用于本文實(shí)驗(yàn)的融合方法,實(shí)現(xiàn)了快速視頻拼接。作為視頻拼接的重點(diǎn),視頻幀圖像的配對(duì)以及融合起到十分核心的地位,本文針對(duì)原始Harris角點(diǎn)算法進(jìn)行改進(jìn),采用更合理的各向同性Sobel算子對(duì)角點(diǎn)進(jìn)行處理,同時(shí),利用四鄰域判別法,快速選擇特征點(diǎn),加快了算法運(yùn)行速率。針對(duì)算法改進(jìn),本文進(jìn)行了多組實(shí)驗(yàn),最終結(jié)果表明本文提出的改進(jìn)算法是切實(shí)有效的。
[Abstract]:Because of its wide-angle limitation, a single camera can not get a series of high-definition video images. In order to solve the defect of single camera, video stitching technology has been developed. Following the in-depth study of computer technology, especially the intelligent driving system using computer vision, intelligent vehicle technology and active driving research, the visual images of the target object are captured in real time in the range of 360 擄. It is also being paid more and more attention by researchers in various fields. In this paper, the performance of fast video stitching algorithm and the effect of stitching are studied. The emphasis is on the following several aspects: 1) this paper uses the common CCD camera to form the video capture unit. The synchronization of multi-channel camera acquisition channels is studied. At the same time, the input video image is pre-processed in this paper to eliminate the problems of poor image quality caused by external light and angle of view, and distortion of the camera itself. This paper analyzes the registration method based on traditional Harris corner algorithm and SIFT feature algorithm. The algorithm based on SIFT features has high running accuracy, but the experimental flow is more complex, which can not meet the fast video stitching. The registration algorithm based on Harris corner has low complexity and short running time. Finally, this paper adopts the algorithm based on Harris corner, and improves and optimizes the original Harris, which has some problems, such as low detection accuracy of specific points and complex running process, which accelerates the speed of stitching without reducing the quality of stitching. In the aspect of video fusion, this paper adopts the two-step processing method, through the distributed processing, combining the linear fusion method, obtains the fusion method which can be applied to the experiment in this paper, and realizes the fast video stitching. As the focus of video mosaic, the pairing and fusion of video frame images play a very important role. This paper improves the original Harris corner algorithm, uses more reasonable isotropic Sobel operator to deal with the corner points, at the same time, The fast selection of feature points by using the four neighborhood discriminant method speeds up the running speed of the algorithm. Several experiments are carried out to improve the algorithm. The final results show that the improved algorithm is effective and effective.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TP391.41

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