JPEG Encoding

JPEG encoding on Stream1 only

Applies to the following firmware variants of Closed3620 Coaxlink Quad CXP-12 JPEG and 3620-4 Coaxlink Quad CXP-12 JPEG.


The 3620 Coaxlink Quad CXP-12 JPEG is a four-connection CoaXPress CXP-12 frame grabber fitted with embedded CFA decoders and JPEG encoders.

The 4-camera firmware variant implements 4 independent channels composed with:

A 1-connection CoaXPress CXP-12 Host interface with PoCXP and Camera triggering capabilities,
An acquisition gate that selects the frames to capture,
A 512 MB FIFO buffer that provides a large elastic buffer,
A Bayer CFA decoder that converts the Bayer8 camera data stream into an RGB8 stream using the advanced algorithm,
A JPEG encoder including an RGB8 to YUV422 converter front-end and a baseline ISO/IEC 10918-1 compliant JPEG encoder,
A down-scaler that reduces by a factor of 8 the RGB8 image resolution in both directions.

Camera requirements

8-bit Bayer CFA area-scan color camera,
Image resolutions (H x V) : from 128 x 16 up to 5120 x 3840, with both width and height multiples of 8,
CXP-1 up to CXP-12 CoaXPress interface.

Channel specifications

Pixel processing rate: up to 250 Megapixels/second
Output streams: 2 ('Preview' and 'JPEG')
Encoder control: JPEG quality

Preview stream specifications

Pixel formats: RGB8 or Bayer8
Resolution: 'full' or '8:1' (for RGB8 only)

JPEG stream specifications

JPEG control: Quality from 1 up to 100 (default: 75)
Pixel format: CustomJFIF
Resolution: 'full'
Latency: 20 lines typical