Machine vision camera interface

 1. USB interface: usb1.0: Published in 1996, with a transmission speed of 1.5mbps; USB1.1: Published in 1998, with a transmission speed of 12mbps, applied to USB mouse, keyboard, household scanner, etc.; USB2.0: Published in 2000, with a transmission speed of 480mbps, a communication distance of 5m, 80% of the bandwidth used for image transmission; USB3.0: Published in 2008, with a transmission speed of 4.8gbps, a communication distance of 10m, 80% of the bandwidth used for image transmission. Features of USB interface: it supports hot unplugging and hot plugging, easy to use, unified standard, multiple devices can be connected, and the camera can be powered by USB cable. But there is no standard protocol, master-slave structure, high CPU utilization and no guarantee of bandwidth.

2. IEEE1394 -- FireWire interface: 1394a: released in 1995, with transmission speed of 400Mbps and communication distance of 4.5m, mainly used in video transmission field; 1394b: released in 2002, with transmission speed of 800Mbps and communication distance of 4.5m. Mainly used in the field of video transmission. 1394 interface features: high speed, hot plug, real-time data transmission, bus structure, plug and play.

3. Camerlink interface: the digital image signal communication interface protocol introduced by AIA association is a serial communication protocol. With LVDS interface standard, it has the advantages of high speed, strong anti-interference ability and low power consumption. From the development of channel link technology, some transmission control signals are added on the basis of channel link technology, and some related transmission standards are defined. The protocol adopts mdr-26 pin connector. Camerlink interface features: high speed, bandwidth up to 6400mbps, strong anti-interference ability, low power consumption.

4. GigE Gigabit Ethernet interface: created and promoted by AIA (Automated Imaging Association); a camera interface standard developed based on Gigabit Ethernet communication protocol; suitable for industrial imaging applications, transmitting uncompressed video signals over the network; the first standard for long-distance image transmission using low-cost cables.

GigE interface features: good expansibility, the longest transmission data can be extended to 100m (unlimited extension on the relay equipment); the bandwidth reaches 1GBIT, so a large number of data can be transmitted immediately; Standard NIC card can be used (or installed by default on PC); cheap cable (Universal Ethernet cable (CAT-6) and standard connector can be used; easy integration and low integration cost can be used; manageable maintenance and wide application can be achieved.