CMOS影像模組測光技術之研究

本論文針對光線所引起的影像問題發展出解決技術，首先提出多區域評價測光(Multi-Zone evaluative metering)，此測光系統會將整個畫面分成多個區域，並依主體所在，決定固定區域的測光加權比重。我們將主要是設計一個嵌入式可視數碼門鈴對講系統影像模組，基於在可視數碼門鈴對講系統在特殊的環境需求，然後針對這個特殊需求對影像做調整，設計一個逆光影像固定測光與補償，利用伽瑪曲線來調整影像亮度，此曲線可以提升逆光影像中主體的亮度，同時讓影像中其他的部份亮度維持，如此便能完成補償的動作，經過測光處理後，進而達到高解析的影像品質。

關鍵字

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並列摘要

Owing to the image problems caused by light, we propose solutions in this thesis. First of all, the method is Multi-zone evaluative metering. This light metering system divides the whole frame into multiple sections and decides the metering weight of fixed section according to where the main object is. Our main goal is to design a module for building into the door phone system, due to particular requirements of environment conditions for digital door phone system, module what we design is to adjust the image by using the back-lighted image detection and the algorithm of compensation. Using Gamma curve to tune the brightness of image can increase the brightness of object at back light as well as preserve the brightness of other fractions of the image. Through this compensation after light metering process, the image can be reached higher resolution.