You're going to get some noise, but it's best to try and avoid the obnoxious, brightly-colored pixel noise often associated with digital cameras and extremely long exposures.

这样会增加图像的噪点，但最好还是尝试一下，因为长时间曝光会产生令人讨厌的，明亮的彩色噪点。

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The second subunit is median filter, which use the median of non-noise pixel in the window to replace the detected noise pixels.

第二部分是中值滤波器，对于检测出的噪声像素，用其相应窗口内的非噪声像素的中值进行替代。

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Because the target only occupies one pixel, its SNR is low and the target almost be submerged by noise, these all bring huge difficulty to detection.

因为目标成像面积小只占一个像素，信噪比低，基本上被噪声所淹没，所以给检测带来了极大的困难。

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Fujifilm claims they've worked through the pixel noise problems that can accompany massive megapixel sensors (we'll have to see about that), but at the very least the S9000 has a 10.7x optical zoom lens, a 1.8-inch tilting LCD screen, a 0.01 second shutter lag time, dual xD and CompactFlash memory card slots, and can capture RAW images.

ENGADGET: Fujifilm's FinePix S9000 and FinePix E900 break the nine megapixel barrier

The miniaturization of pixel size impacts performance of light sensitivity and signal to noise ratio (SNR) in today's 1.12 micrometer pixel image sensors.

ENGADGET: Toshiba preps 13MP phone camera sensor that promises low-light shooting without the noise

Conventional CMOS image sensors mount the pixel section and analog logic circuit on top of the same chip, which require numerous constraints when wishing to mount the large-scale circuits such as measures to counter the circuit scale and chip size, measures to suppress noise caused by the layout of the pixel and circuit sections, and optimizing the characteristics of pixels and circuit transistors.

ENGADGET: Sony's new cameraphone CMOS jams bigger gear into the same space (video)