1. The concept of computer vision
Computer vision is to replace the visual organs with various imaging systems as input-sensitive means, and the computer replaces the brain to complete the processing and interpretation. The ultimate goal of computer vision is to enable computers to visually observe and understand the world like humans, with the ability to adapt to the environment. But before the ultimate goal is achieved, the medium-term goal of people's efforts is to create a visual system that can perform certain tasks based on a certain degree of intelligence of visual sensitivity and feedback. (The point to be pointed out here is that computers in computer vision systems act instead of human brains, but it does not mean that computers must perform visual information processing in a human visual way. Computer vision can and should be based on the characteristics of computer systems. Processing and guidance of visual information.)
2. The development of computer vision
Visual research was based on two-dimensional before Roberts, and most of them used pattern recognition to complete the classification work. Roberts first successfully used the program to explain the world of 3D building blocks, and in a similar study later, Huffman. Clowes and Waltz et al. studied the building block world and solved the problems of explaining scenes and dealing with shadows by line segments. The study of the building block world reflects some of the characteristics of early visual research, starting with a simplified world. These efforts have contributed to the development of visual research, but it is difficult to work with slightly more complex scenes.
In the mid-1970s, some researchers, represented by Marr, Barrow, and Tenebaum, proposed a set of visual computing theories to describe the visual process, the core of which is to restore the three-dimensional shape of the object from the image. In the theory of visual research, Marr's theory has the most profound influence. Its theory emphasizes the importance of representation and proposes to study the problem of information processing from different levels. He emphasized the importance of computational theory for computational theory and algorithm implementation. Although this framework still has incomplete aspects in the details and even in the dominant thinking, there are still many controversies in many aspects, but it is still the basic framework of computer vision research.
In the mid-to-late 1980s, with the research of mobile robots , visual research is closely combined with the introduction of spatial geometry methods and physical knowledge. The main goal is to realize the recognition and treatment of roads and obstacles. In this period, active vision research methods were introduced, distance sensors were used, and techniques such as multi-sensor fusion were adopted.
Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
The last SCSI device in the SCSI chain uses a terminator, and the intermediate device does not need a terminator. Once the terminator is used by the intermediate device, the SCSI card cannot find the future SCSI device. If the last device does not use a terminator, SCSI will not work properly. Terminator is composed of resistors, located at the end of the SCSI bus, to reduce the mutual influence of the signal, maintain the constant voltage on the SCSI chain.
Most of the SCSI devices have built-in terminators and use a jumper to control on / off. The SCSI device is highly intelligent and can automatically control the terminator on / off. For example, if a hard disk is connected to a CD-ROM, the CD-ROM can work normally regardless of whether the terminator of the hard disk is on or off. However, when two hard disks are connected, the situation becomes more complicated. Before two Seagate hard disks are connected, one hard disk terminator must be off. Before a Seagate hard disk is connected to a quantum hard disk, a hard disk terminator can work normally regardless of whether it is on or off.
SCSI-90°DIP Section
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