数码照片的噪点与降噪方法

数码相机拍摄的照片，都不可避免地存在着噪点．噪点严重时破坏色彩和影调，造成照片像质下降，美感受损．通过对数码相机中噪点产生的原因：感光度设置，影像传感器的尺寸等的分析，用可行的方法控制噪点，再加后期用软件，如Photoshop，Neat Image等进行降噪处理，可使数码照片更具表现力．

Noise source of digital image and analysis of noise reduction method

Images acquired through digital by a digital camera may be contaminated by a variety of noise sources. Severe noise or grain would deteriorate the color and hue of images. This paper will study the causes of noise generation in digital image at first, which includes ISO adjustment, sensor size and so on; then discuss some feasible methods to reduce the noise level, finally demonstrate some cases of noise reduction by use of consumer software applications, for example, Photoshop, and Neat Image, in order to make image more clear and attractive.