先從構造上說起,普通的ccd里面的成像單元都是長方形的,而且排列的方式是矩形排列,而superccd是8邊形的構造,在有效感光面積上來說superccd要占優勢,而且superccd的排列方式是蜂窩狀排列,能夠更有效的利用空間,使得整體感光度方面(感光度就是在同面積上ccd對光線吸收的多少,也可以說是對光線的利用效率),superccd要比普通的ccd要高,這也是為什么早期superccd的iso起點一般都為iso200的原因。
數碼相機拆解:
Super CCD是由富士公司獨家推出的,它并沒有采用常規正方形二極管,而是使用了一種八邊形的二極管,像素是以蜂窩狀形式排列,并且單位像素的面積要比傳統的CCD大。將像素旋轉45度排列的結果是可以縮小對圖像拍攝無用的多余空間,光線集中的效率比較高,效率增加之后使感光性、信噪比和動態范圍都有所提高。
富士公司宣稱,Super CCD可以實現相當于ISO 800的高感度,信噪比比以往增加30%左右,顏色的再現也大幅改善,電量消耗減少了許多。富士公司宣稱Super CCD可與多40%像素的傳統CCD的分辨率相媲美,Super CCD打破了以往CCD有效像素小于總像素的金科玉律,可以在240萬像素的Super CCD上輸出430萬像素的畫面來。因此,富士公司和他們的Super CCD一推出即在業界引起了廣泛的關注。
在傳統CCD上為了增加分辨率,大多數數碼相機生產廠商對民用級產品采取的辦法是不增大CCD尺寸,降低單位像素面積,增加像素密度。我們知道單位像素的面積越小,其感光性能越低,信噪比越低,動態范圍越窄。
因此這種方法不能無限制地增大分辨率。如果不增加CCD面積而一味地提高分辨率,只會引起圖象質量的惡化。但如果在增加CCD像素的同時想維持現有的圖象質量,就必須在至少維持單位像素面積不減小的基礎上增大CCD的總面積。但目前更大尺寸CCD加工制造比較困難,成品率也比較低,因此成本也一直降不下來。
Allen Bradley 1746-nio4v ALPHASEM FE7B-FDA6
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