Digital Camera Noise

Digital camera noise mainly refers to the CCD ( CMOS ) will be light as a received signal receiving and output generated in the process of image of the rough part, also refers to the image of the external pixel, usually by the electronic interference. Looks like the image blurred, with some small rough point. We usually take digital photos if you use personal computer will shoot to high definition image shrinking later see, may not pay attention to. However, if the original image, then there will be no color ( false color), the color image noise is false.

Definition

In addition to noise, another is as easy to confuse this noise, is dead. In a digital camera the same setting conditions, if images of miscellaneous points always appear in the same location, that this digital camera being dead, the dead pixel manufacturers generally have more, if the pixel number exceeds a specified amount, to distributors and manufacturers to replace the camera. If the noise does not appear in the same location, then these miscellaneous point is formed when the noise due to the use of.

Noise: CCD and CMOS photosensitive element have thermal stability ( hot pixel ) problem, is the imaging quality and temperature, if the camera 's temperature increases, the noise signal is strong, will be on the screen should not have a place to form colored spots, the point is we are speaking of the noise. Various brands of various types of camera on noise control are not the same, the same type of fear cameras also have certain individual differences, but also some cameras have noise reduction function. But the pixel is now all DC failed to completely overcome the problem ( high sensitivity ( ISO ), especially for long time exposure, or the camera when the temperature rises ).

Reason

CCD and CMOS photosensitive element have thermal stability ( hot pixel ) problem, is the imaging quality and temperature of the machine, if the temperature increases, the noise signal is strong, will be on the screen should not have a place to form colored spots, the point is we are speaking of the noise. Various brands of various types of camera on noise control are not the same, the same camera models also have individual differences, but also some cameras have noise reduction function. But the noise problem is now all DC failed to completely overcome the problem ( high sensitivity ( ISO ), especially for long time exposure, or the camera when the temperature rises ). Noise and sensor structure and the number of processor differences and different.

Long time exposure generated noise

This kind of phenomenon is most seen in the use of low ISO shooting night, in the darkness of the image of the night sky, there are some random spot. Can noise and ISO coefficient relationship

Say the reason why is because the processor cannot deal with a slow shutter speed brings tremendous workload, leading some specific pixel caused by the loss of control. In order to prevent the generation of such image noise, some digital camera with a known as" noise " function.

If the use of noise reduction function, the recorded image will use digital processing method to eliminate image noise, therefore in the save completed before the need to spend a little extra time. But with noise reduction function of the opening, the picture detail loss.