The relationship between the size of CCD chip and the imaging quality of industrial cameras

Image sensor (CCD or CMOS chip) is the key element of industrial camera imaging.The larger a single pixel of image sensor is, the better the ability to capture the light. The large the area of the image sensor, the more sensitive components can be accommodated.The more photons captured, the better the photographic performance, the lower the signal-to-noise ratio.It can see from better imaging effect, that is, the image is delicate, rich and true.Under the same conditions, more details of the image can be recorded. The interference between the pixels is small. It can be more competent under the condition of weak light.However, the larger the area of the image sensor is, the higher the cost is. 

The current trend is to remain the size of CCD unchanged or even reduce it to increase the number of pixel sensor as far as possible to meet the endless requirements on the pixel.But if the size of the CCD unchanged, the increase in pixel size means that the photo sensitive area of a single pixel is reduced. The ability of single pixel to capture light will decrease, which will lead to the increase of noise, poor color, dynamic range, etc.For example, for 300 thousand pixel industrial CCD camera, the imaging quality of the CCD chip size which is 1/3 is certainly better than that of 1/2.
Aiming at these problems, it is necessary to have the corresponding technical measures to compensate.For example, the decreasing of pixel size leads to the lack of light. The easiest way to deal with it is to improve the sensitivity of the chip (at the same time, it also increases the noise and needs the noise reduction processing.)Advances in technology are always trying to minimize and eliminate the problems caused by the small pixel, but the large pixel is still a guarantee of better image quality. So we can see the high-end models mostly use larger size CCD.
  
From the point of view of choosing and industrial camera, the larger the size of CCD, the better the image quality is guaranteed for the same generation of products.