Photon Focus CameraLink MV1-D1312 series, User Manual

Page: 23 / 119

3.4.1 3 Tap Mode
The MV1-D1312(i)-240 cameras comply with the 8bit monochrome 3-tap CameraLink
®
base
standard. The first pixel in the image is located at tap 0, the second at tap 1 and the third is
located at tap 2. At the time of writing, no framegrabber visualization GUI supports this mode.
It is however possible and easy to write applications using this 3 tap mode when the 24-bit RGB
mode is used instead. In this configuration the red channel is tap 0 (or pixel 0), the green
channel is tap 1 (or pixel 1) and the blue channel is tap2 (or pixel 2).
If the 24-bit RGB mode is used, the framegrabber’s image width must be set 3
times smaller than the camera’s image width. The MV1-D1312(i)-240 cameras
send 3 pixel data per CameraLink
®
clock cycle in parallel. The framegrabber in
24-bit RGB mode however processes these 3 pixels as one RGB pixel.
In the RGB mode the memory management of a 24bit colour image has to be considered. Blue
is usually stored at address 0, green at address 1 and red at address 2 and so on in this order.
Since the blue channel in the camera link standard is located at tap 2 (pixel 2) and the red
channel at tap 0 (pixel 0), pixel 0 & 2 would be stored in the wrong order in the memory. The
MV1-D1312(I)-240 cameras provide a “BGR” mode. This swaps pixels 0 & 2 at the camera link
interface and the pixels then have the proper order in the memory. In this configuration an
image can be grabbed in 24-bit RGB mode and the RGB buffer can be read out as an 8-bit
monochrome buffer without the need of copying the pixel data.
Ask Photonfocus support ( <support@photonfocus.com>) if you have problem
using the 3-tap mode.
.
3.4 Frame Grabber relevant Configuration 21