Color sorting equipment color line scan camera 3 kinds of technology image quality comparison
For high-end applications that require high details of the measured object, a color line scan camera solution can be used. The color technologies of color line scan cameras mainly include prism beam splitting technology, three-line technology, and two-line technology. The image quality comparison of the three technologies of color line scan cameras is as follows:
1. Prism spectroscopy technology: select 3 CCDs to obtain three colors of information through the form of prism spectroscopy, and complete registration at the same time (three colors are aligned with the same target). It is equivalent to 2048*3, a total of 6144 pixels, corresponding to each target point, at the same time there are three pixels R, G, B photosensitive, the spectrum is complete. That is, the imaging chip of the prism-splitting 3CCD camera is composed of three discrete components, R/G/B, and the same beam of light is divided into three RGB beams based on different wavelengths by the prism and then imaged separately. It is guaranteed that the camera can only image the same point on the target at the same time and get RGB three-color signals at the same time. In this way, even if the target is slightly shaken, it will not affect the imaging.
2. Three-line technology: The three-line CCD is packaged on a substrate without registration, that is, the imaging targets of the three-line CCD are different at the same time (the RGB photosensitive array images points at different positions on the target at the same time), which requires software processing. When the target is jittery, it is difficult to correct the imaging errors caused by the three CCDs simultaneously imaging points with different depths of field. It is precisely because of the imaging method of the three-line camera that it needs to carry out strict and precise motion compensation settings, which puts forward strict requirements on the smoothness of the target motion and the uniformity of speed.
3. Two-line technology: similar to three-line technology, two rows of CCDs are packaged on one substrate. But there is no distance between the two lines, which reduces the requirements for spatial correction. One row of sensors provides red and blue components at intervals, and the other row of sensors provides all green components.