Process of digital video interface

So when light enters the lens it goes through a prism which seperates the light into three primary colours. This is with the 3 CCD cameras which stands for charged coupled device. The reason that there is three CCD’s is so that each one can process each colour information separately. So here we have the light going into one of the CCD’s (fig1), and this light is then converted into a voltage depending on its brightness.

The different levels of voltages are sent vertically through a shift register which then gets pushed through the horizontal shift register.

We now go ahead to the process of out of the end of the camera.

This information is then transferred into a linear matrix converting the sampled gamma corrected RGB signal into a Y’ B-Y’ R-Y’signal so that the data is less. This sampling method is known as 4:2:2 as discussed before. The analogue signal is sampled at 5.5MHz: 2.75MHz: 2.75MHz for Y:B-Y:R-Y respectably. The signal will need to go through an analogue to digital converter where they are then clocked at 13.5MBs:6.75MBs:6.75MBs respectably. These are then multiplexed together at 27MHz 10 bits.

 

 

 

 

This process is used within any broadcasting 3CCD camera, and is just to help better to understand how cameras work in a simple form. We will be going into more detail of each process soon. Enjoy!