Sensor的Well Capacity是什么意思?

3homer · 发表于 2006-12-28 14:48:28

单位是Ke, 如ov7660是35Ke

3homer · 发表于 2006-12-29 12:05:08

无人知道啊,我顶!!

William · 发表于 2006-12-29 14:37:45

full-well capacity：
The number of electrons that each pixel of a charge-coupled device can hold without overflowing and causing blooming.

觉得这是决定 SENSOR 动态范围大小和灵敏度的硬件条件！！
[br]+1 RD币

callen · 发表于 2007-11-6 16:49:30

ke是什么单位呀,中文怎么说?

3homer · 发表于 2007-11-6 21:31:01

What is full-well capacity of my camera and why is it important?

The full well capacity of a sensor is the amount of electrons a pixel can hold before the charges overflow into the neighbouring pixels or drain into the silicon substrate if the camera offers antiblooming.

The full well capacity plays a major role in defining the dynamic range of the camera. It is important to realize that, depending on the gain used in the camera, you may not be exploiting the well capacity of the sensor to its full potential. The saturation level of the camera is defined as being the point when the pixel is filled to 100% of its capacity at minimum gain. However, when a 10x gain is used, saturation will occur when only 10% of the pixel well抯 full capacity is consumed.

Another important consideration is photon-shot noise. Shot noise is the square-root of the amount of electrons stored in the well, thus it will give a more significant percentage of the signal at high gain than at low gain levels.

The following table summarizes the full well capacities of the sensors used in DALSA cameras. For any additional information please contact Product Support.

说实话，我是没有太看懂，呵呵[br]+1 RD币

wfdragon · 发表于 2007-11-7 09:25:41

个人理解：
Well即阱也，也就是当光电二极管进行光电转换时，转换出来的电荷要储存在电势阱中，阱也就起到暂时储存电荷的作用，但当储存的电荷超过阱的最大容量时就会出现溢出，所以为了防止溢出造成数据丢失及产生噪声，就要及时转移电荷.....[em12][em12][em12][br]+1 RD币

sea_83 · 发表于 2007-11-7 09:38:07

CCD里面称为阱深,对应着sensor的动态范围,若一个象素的电荷超过它,其内的电荷就会流到临近电荷产生影响
在拍摄时曝光过度或高亮的光源,会产生很大一块饱和的白色区域就是因为这个原因引起的[br]+1 RD币

KING11 · 发表于 2007-11-7 10:01:21

学习了。[em02]

3homer · 发表于 2007-11-7 20:04:51

受教。。谢谢

lucas_07 · 发表于 2015-4-24 14:47:43

满井电荷

chiashow · 发表于 2015-7-10 01:29:20

35Ke = 35000 electrons

52RD网友 *发表于 2015-7-15 09:33:39* · 发表于 2015-7-15 09:33:39

阱容，单位是电子数。是一个推算数，原厂基本不会开放测试手段，无法作为spec校验。
有参考意义，反应动态范围，同样大小像素的一般在接近水平。

075588849009 · 发表于 2015-7-23 18:02:34

专做：豪威（OV）：OV5648 OV5645 OV5640 OV5670 OV2675 OV2710 OV2715 OV4689 OV7725 OV7740 OV9712 OV9655 OV9726；镁光（Aptina）：AR0330 AR0130 MI5100 ，索尼SONY系列：COB：IMX214/219/179；NT99141 CLCC：IMX222/238/322/225 周生 13242024445 QQ：952357383

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[讨论] Sensor的Well Capacity是什么意思?