Nowadays, with the rapid development of information technology and the increasing demand of users, the application of embedded system has expanded year by year and has gradually integrated into many aspects of national production. Specifically, an embedded system is a computer system with specific functions. Embedded system organically combines network technology and communication technology, which effectively improves the intelligence and flexibility of communication.
The application of embedded system in image processing can significantly improve the data processing and communication capabilities of image processing system, and then effectively expand the application scope of image processing technology and its adaptability to different needs and environments. Applying embedded system to image processing is one of the new ways of image processing. At present, image processing technology has a wide range of applications, involving instrument detection safety, consumer electronics, industrial automation, medicine and other fields, so image processing technology has a very broad application prospect.
1 characteristics of embedded image processing system
1) image processing system, with a special graphical user interface, has the characteristics of fast running speed, simple use and powerful functions. 2) The establishment of basic image database can provide support for intelligent pattern recognition technologies such as image matching. 3) The original image processing strategy and algorithm have been changed, which can provide effective image processing algorithm according to the different characteristics of the specific image to be processed, and improve the efficiency and speed of image processing. 4) The bus structure of the external image and the dedicated input/output devices are adopted, which effectively improves the data exchange speed between the external image input/output devices and the central processor.
5) Change the original computer architecture and apply an embedded dedicated platform. At the same time, the image high-speed processor is applied, which effectively improves the speed of image processing and the real-time performance of image processing tasks.
2 overall design of image processing system
2. 1 embedded image processing system
Embedded image processing system consists of embedded operating system, image processing algorithm application software and hardware platform. The system structure diagram is shown in figure 1. The hardware platform can provide display, storage and calculation support for image processing. The embedded development platform MagicARM24 10 is mainly adopted, including the image storage module. Display module; Communication module; Embedded processor S3C24 10, SDRAM, etc.
2.2 image processing process
Embedded operating system can provide effective technical support and management for the underlying hardware, such as image processing task management; Interrupt management; Memory management; Task management; Drive support, etc. First, after the system is started, the operating system is started through the boot program, and then the hardware initialization is completed. Secondly, the memory is allocated by the task management module of the operating system, and the image information is stored in the video buffer of the memory. Thirdly, through the software algorithm, the image information of the display buffer is written into the LCD buffer to realize the real-time display of the image. Fourthly, the image is encoded, processed and stored by the algorithm of image processing. The application software can realize the image processing algorithm, which is mainly a special program written for the target requirements.
2.3 Functional design of the system
Embedded image processing can effectively solve the problem of image processing in embedded environment.
Specifically, modular design is mainly used to design tasks that need to be completed by the system in a functional modular way. Each module contains an image processing method, and the corresponding algorithm will be called when it is executed. The functional modules of the system are shown in Figure 2, which are mainly divided into morphological operations; Geometric transformation; Image analysis; Image enhancement. Among them, the image enhancement module specifically includes: gray scale transformation adjustment; Histogram correction method; Histogram, etc. , as shown in Figure 3. The image processing operation will be subdivided into each main system module, and the other three modules are similar in design form to the image enhancement module.
3 the development trend of image processing system
1) In the image processing system, we mainly develop integrated software. For users, corresponding image processing algorithms can be developed according to their own needs, which can significantly improve the efficiency of the system. 2) The combination of image processing system and network is gradually improved, so as to realize remote transmission and acquisition of images. 3) The function of graphics processing system is no longer completely dependent on PC and various auxiliary devices, but will be integrated on a convenient electronic device. 4) With the progress of hardware equipment, the performance of image processing system is improved year by year, so the price will decrease year by year.
4 conclusion
Based on the image processing technology of embedded system, convenient man-machine user interface, various communication modes and network interfaces have appeared in the field of image processing. The application scope of image processing technology is more and more extensive, so in the future development, it will inevitably develop in the direction of networking, portability, multi-task and multi-function. With the powerful function of embedded operating system, the development direction of image processing technology will be broader.
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