使用邊緣保留技術模擬大型感光元件陣列

Abstract

自從相機功能數位化後，相當常見的應用即為與其它手持設備的整合。例如現行的中高階手機、PDA上均備有相機模組。然而，在這些手持設備上的相機相較於純消費型數位相機而言，往往畫質差上好幾個等級。其中的主要原因為體積限制進而造成內部感光元件面積亦受限。 當感光元件面積窄小時，若強制實行高畫素分割，則每一像素的能使用之感光元件面積會相對窄小，因此造成鄰近像素感光元件漏電流的干擾。而且可用感光面積相對縮減，會造成可用之訊雜比減小。所以我們必須另行設計一方式以達到模擬大型感光元件的方法 在本篇論文中，我們應用了不同通道間的色彩差值關係以實行內插放大感光元件陣列。並以本實驗室發展出之非跨越性方向性權重計算法以實施於非連續感光元件陣列之內插，亦應用以偵測邊緣之技術以達良好的影像邊緣保持效果。

Abstract The digital cameras can be easily integrated with other handheld devices in one single chip. For hardware size and cost consideration, the camera sensor array of the PDAs or the cell phones is therefore limited. However, as the demanding of better image quality is increasing, the producer needs to employ large sensor array for higher image resolutions [3]. Therefore, how to emulate large sensor array to raise resolutions is a key problem to these devices. In this paper, we introduce a novel cost-effective interpolation method to enlarge the sensor array for higher resolution. Unlike traditional enlargement methods which operate only within a color plane, our method utilizes the relation between the distinct channel color differences of neighbors and the non-cross weight-based approach. Experimental results indicate the proposed method has the ability to emulate efficiently larger sensor array from the relation of color difference over local region and edge-sensing weight coefficients. This algorithm gives sharp edges over the enlarged image without color-bleeding artifacts. The experimental results demonstrate the effectiveness of the proposed method.