Автор: night
Дата: 27-05-04 16:38
http://www.cyberphoto.se/fuji/superccd.htm
извадка
Radically different from conventional CCDs with square photodiodes and sensor arrangements, Fujifilm's new Super CCD has octagonal-shaped photodiodes and sensors situated on 45-degree angles. This pattern increases sensitivity, improves signal-to-noise ratio and offers a much wider dynamic range, attributes that produce digital images with richer, true-to-life colors and sparkling clarity.
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The new sensor shape and arrangement of the Super CCD offers a number of advantages over the current, conventional CCD. For example, space efficiency for the photodiode located in each sensor has been dramatically improved by its octagonal shape. In addition, the arrangement of the sensors allows them to be packed at maximum density and this efficient use of space allows for larger photodiodes and higher resolutions.
Plus, the difference in the area of the photodiode is more pronounced with a larger number of sensors, a factor that results in better image quality. So, for example, the area of the photodiode in a ½-inch Super CCD with two million sensors is about 1.6 times as large as the area offered in the conventional CCD with the same number of sensors.
A larger photodiode area (a Super CCD photodiode is 50 percent larger than that of a conventional photodiode) proportionately improves sensitivity, the signal-to-noise ratio and the dynamic range, key elements in digital image capture. As a result, a Super CCD sporting 1.3 million sensors would reproduce the picture quality of a conventional CCD with 2 million sensors.
In addition, the Super CCD mirrors characteristics of the human eye to interpret collected information. Similar to the function of the retina, which is used to interpret color and light, the Super CCD transforms optical signals into electrical impulses.
These impulses are then passed through a signal processing system to form the image.
Fujifilm researchers also learned that the human eye recognizes information better in horizontal and vertical directions. By arranging the sensors at 45-degree angles, the new Super CCD sharply increases the image sensor's ability to capture more resolution in both the horizontal and vertical. This results in an image more pleasing to the human eye.
Публикацията е редактирана (27-05-04 16:41)
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