Dual-line colour cameras
Colour line scan cameras can also be realised based on colour coding of a dual-line sensor. For each horizontal pixel, real data exists for two out of the three colours. Using onboard preprocessing, the third colour is interpolated from the adjacent pixels, so that image data for red, green and blue can be transmitted.
There are a number of formats in which the coloured pixels are positioned. One uses an alternating pattern similar to the area scan Bayer format. Using the other method the first row is covered with green filters, whereas the pixels of the second line use alternated red and blue filter layouts. One advantage of this second format is that we get full resolution in one wavelength. For many applications this is a good compromise in a cost-effective package.
The latest camera in our portfolio that contains this configuration is the Linea from Teledyne DALSA. The attractive price point hasn't made DALSA hold back on this one, either. As, with a feature set that easily compares to some of the high end line scan systems, the Linea is definitely worth a look.