CFA Decoding in Coaxlink cards

Decoding methods

Three distinct Bayer CFA decoding methods are defined in CoaxlinkEuresys product series name of CoaXPress frame grabbers cards to transform the raw Bayer CFA data stream issued by the camera into an RGB color data stream

Method Kernel Algorithm
Legacy (Method 1) 3 x 3 Linear interpolation
Advanced (Method 2) 3 x 3 Median-based interpolation
Method 3 5 x 5 Gradient-based interpolation

Decoder features per product

Product Firmware
variant		 Available decoding methods Maximum
line length
[pixels]
1633 Coaxlink Quad G3
1633-LH Coaxlink Quad G3 LH 		1-camera Legacy, Advanced 16,384
1635 Coaxlink Quad G3 DF

1-camera
1-df-camera

 Legacy, Advanced 16,384
3602 Coaxlink Octo 1-camera
 Legacy, Advanced, Method 3 16,384
2-camera Legacy, Advanced 16,384
3622 Coaxlink Duo CXP-12 1-camera Method 3 8,192
3603 Coaxlink Quad CXP-12 1-camera Legacy, Advanced 16,384
3620 Coaxlink Quad CXP-12 JPEG 4-camera Advanced 16,384

Decoder performances per product

Product Firmware
variant

Peak pixel processing rate
[1,000,000 pixels/s]

 PCIe Interface
1633 Coaxlink Quad G3
1633-LH Coaxlink Quad G3 LH 		1-camera 1,000 4-lane Rev 3.0
1635 Coaxlink Quad G3 DF

1-camera
1-df-camera

 1,000 4-lane Rev 3.0
3602 Coaxlink Octo 1-camera
 2,000 8-lane Rev 3.0
2-camera 1,000 per stream 8-lane Rev 3.0
3622 Coaxlink Duo CXP-12 1-camera 2,000 8-lane Rev 3.0
3603 Coaxlink Quad CXP-12 1-camera 2,000 8-lane Rev 3.0
3620 Coaxlink Quad CXP-12 JPEG 4-camera 500 on stream0 8-lane Rev 3.0

PCIe performance

PCI Express Interface Sustainable PCIe data rate RGB8 RGB10, RGB12, RGB14, RGB16
4-lane Rev 3.0 PCIe End-point 3,350 MB/s typical ~1,117 Mpixels/s ~558 MPixels/s
8-lane Rev 3.0 PCIe End-point 6,700 MB/s typical ~2,238 Mpixels/s ~1,117 Mpixels/s

When configured to deliver RGB8 pixels, the PCI Express Interface is capable to sustain the highest CFA decoder pixel rate!

For 10-, 12-, 14- and 16-bit bit depths, the sustainable data output rate is further limited by the performances of the PCI Express Interface on the Host PC.

Latency

The hardware CFA decoder performs on-the-fly conversion with a negligible latency when the data throughput is NOT limited by the available PCI Express bandwidth!