Camera inspection systems mainly include CMOS (CCD) sensor, Conductive fiber, light guide, light source, power supply and monitor. Due to the size of the monitor and cold light source and its power requirements led to the entire system bulky, inconvenient to carry, and can’t be saved as required by the image, not easy to post-fault signal processing. ARM9-based portable camera inspection systems based on the industrial endoscopy detection system, the introduction of embedded systems, give full play to embedded systems, small size, low input voltage, touch screen display, the use of programming can be achieved image processing and storage advantages, Well meet the detection system for miniaturization, easy to carry requirements.
Currently, industrial borescopes are widely used in the field of industrial manufacturing and maintenance. It extends the distance between the human eye and broaden the horizons of human observation. It can clearly and accurately observe the inaccessible parts of the human eye without dismantling or destroying the machinery and equipment to achieve the non-destructive inspection of machinery and equipment or parts. May save on maintenance time, which is quite important in the field of weapons and equipment overhaul applications. In order to achieve the miniaturization and portability of the borescope systems, this paper designs and implements portable camera inspection systems based on the ARM9.
ARM embedded system and its camera interface Embedded system is application-centric, computer technology-based, and hardware and software can be cut, apply to the application system for the function, reliability, cost, size, power consumption, strict requirements of the dedicated computer system. Usually consists of embedded CPU, peripheral hardware, embedded operating system and application of four parts, for the realization of other equipment control, monitoring or management functions. The system is a combination of advanced computer technology, semiconductor technology and electronic technology applied to various industry-specific products. The IP level, chip level, and module level are the three major architectural forms of embedded systems. Among them, the module-level form is embedded into the application system of the computer system module that has been mature X86 processor, make full use of the commonality and convenience of the commonly used PC architecture at present.
The system device is divided into lighting system, CMOS camera, embedded system in three parts.
2.2.1 Lighting System
General inspection cameras are used independent cold light source, and by the optical fiber to the inspection position. In order to achieve better lighting effects, the requirements for light sources and optical fibers are high. Because of the embedded system based on ARM9 and the requirement of the volume can’t adopt the independent cold light source again according to the past. In the portable camera inspection systems design process, clever application of a low-power high-brightness light-emitting diode (LED) for lighting, in order to solve the light source problem. The high-brightness light-emitting diode operating voltage 3.3V, light color white, high brightness, connected with the potentiometer to achieve adjustable brightness, the upper and lower ends of the fixed one, to ensure uniform illumination field of view. Test proved completely feasible.
2.2.2 CMOS Camera
The camera used in the portable camera inspection systems is the OmniVision OV7660. This type of CMOS sensor is currently widely used in portable handheld devices. Its features are: high sensitivity, low voltage operation, standard serial camera control bus (SCCB) control, the output window size adjustable UXGA / SVGA / VGA / QVGA different pixel images 2.2.3 embedded system module The embedded system module preinstalled system is Windows CE .NET 4.2, the driver form is flow interface driver, and the basic framework is dll dynamic link library compiled by using Embedded Visual C ++ 4.0 or Platform Builder 4.2. EVC (Embedded Visual C ++) is recommended because EVC is faster. In the portable camera inspection systems, the main function of the module is to receive the camera image signal and synchronously display the image through the touch screen. In order to realize this function, it is necessary to use EVC programming and download to the embedded system through USB synchronization to realize the processing of the video image signal, including image processing denoising, feature extraction, defect size estimation and corrosion defect imaging.
In this paper, the current general purpose industrial borescope exists bulky, heavy weight, inconvenient to detect the shortcomings of the field, based on the ARM9 embedded system based on the design and implementation of a portable camera inspection system. The system tested on the test parts, the results show that the device system to solve the shortcomings of general industrial based on the end, but also with high-definition, high-fidelity features, can be used for the detection of micro-defects in the surface of equipment and equipment to determine.