Embedded Linux System Research Articles

Embedded vision detection of defective orange by fast adaptive lightness correction algorithm

Automatic detection of defective fruit by computer vision system still faces challenge due to the uneven lightness distribution on the surface. A fast adaptive lightness correction algorithm implementation which is simpler and easier in real-time approach is proposed to overcome interferences from non-uniform reflectance intensity distribution on moving fruit surface and avoids error detection. The algorithm is tested by on-line and static defective orange images in the different lighting conditions. This study also compares other lightness correction algorithm implementations for defect detection. Recently, embedded vision systems are more and more popular because of low-cost, compact size and stability. A low-cost embedded vision system based on an industry gigabit ethernet camera and embedded Linux system in an arm processor with limited computing power compared with high-performance major PC is also originally developed to test and prove the performance of fast adaptive lightness correction algorithm using the most common surface defect of Navel orange in China. The time consumption of adaptive lightness correction algorithm of an image is below 6ms. The processing time of an orange image is below 30ms.

An image display method for portable medical endoscopes using intelligent mobile devices

Objective To study an image display method for portable medical endoscopes using intelligent mobile devices for solving the problem of lacking medical resources in remote areas and carrying inconvenience of endoscopic workstations. Method An high-definition camera was employed for image data acquisition, which was driven by the built-in Video4Linux drive program of a embedded Linux system. A wireless network card was used to establish a point-to-point network, and to build the LAN server. The mobile devices could acquire the collected image data through accessing the local area network, which could realize the real-time display on the LCD screen. Results The resolution of a collected image was 1 024×768 pixels, the bit depth was 24 bits, the frame rate was 30 frame/s, and the actual average transmission speed was about 2 MB/s. Conclusions The proposed method is effective and feasible. The collected image is clear, and the system has advantages of simple structure, low cost and easy to carry,which can save the manufacturing cost and meet the conditions of usage in remote areas. Key words: Medical endoscope; Intelligent mobile device; Image data acquisition; Embedded Linux

On Limits of Embedded Systems in Network Packet Processing

The paper deals with a measurement of single-hop one way packet delay on embedded systems used for networking. The single-hop one way packet delay is essential parameter when we need to process packets with strict delivery time constrains. Comparison of different approaches to single-hop one way packet delay measurements is presented in this work along with discussion about strong and weak points in specific measurement approach. The impact of different types of system load and number of CPU cores are also covered by presented results. The presented results of measurement single-hop one way packet delay in embedded Linux system show that for the specific system configuration the packet processing delay depends (in different ways) on system load and network stack load.

임베디드 리눅스 환경에서 메모리 사용량에 근거한 에너지 효율적 디바이스 주파수 변경 기법

임베디드 리눅스 환경에서 메모리 사용량에 근거한 에너지 효율적 디바이스 주파수 변경 기법

Continuous Data Acquisition Equipment Based on Embedded Linux System

This designed system adopts the Embedded Linux operating system to achieve this desired embedded characteristic and further it proposes annular buffer technique to provide continuous data acquisition with no sampled data loss. Through monitoring wheel hubs’ operation, which works to evaluate the performance of cars, the system is demonstrated to be able to provide reliable and continuous data for equipment.

듀얼 버스 시스템에서의 공유 메모리 커널 모듈 구현

본 논문에서는 프로세서별 서로 다른 버스에 서로 다른 운영체제를 갖는 멀티코어 시스템에서 공유 메모리 기능을 구현하고, 임베디드 리눅스 시스템을 통하여 두 프로세서 사이에서 공유 메모리 기능을 실험하였다. 듀얼 버스 구조에서 공유 메모리 구현을 위해 메모리 컨트롤러를 이용하였으며, 리스트 자료구조를 통하여 공유 메모리 세그먼트를 관리한다. AMP 멀티 코어 실험을 위하여 2개의 프로세서 코어에 리눅스 운영체제를 탑재하도록 하였다. 그리고 공유 메모리 테스트를 위하여 구현된 커널 모듈을 이용하여 공유 메모리 생성 및 이용이 가능함을 확인 하였다. In this paper, shared memory feature was developed in multi-core system with different OS for different processor-specific bus, while conducting an experiment on shared memory feature between the two processors based on embedded Linux system. For the purpose of developing shared memory in dual bus structure, memory controller was used, while managing shared memory segment through list data structure. For AMP multi-core test, Linux OS was installed in 2 processor cores. In addition, it verified the creation and use of shared memory by using kernel module implemented to test shared memory.

Research of Network Camera Based on TMS320DM8168

The paper adopts the TMS320DM8168 processor to realize highly resolution network video surveillance system, and selects highly efficient video coding standard—H.264 compression algorithm to enhance the efficiency of coding data. The system based on embedded Linux system and the TMS320DM8168 processor is put forward which can be operated on 8-megapixel.At 60 frames per second in full frame rates, It is the video stream up to 2Mbps rate to provide resolution of 1920x1080 pixels. The Three video streams can be transferred in the 1000M Ethernet applied with the real time transport protocol (RTP) and real time transport control protocol (RTCP).

The Research of the Real-Time High-Resolution Image Acquisition Based on Embedded System

This paper presents the design of a real-time high-definition image acquisition. The hardware platform combines Intel Xscale PXA270 processor, high-resolution camera and SAA7114H. The system is based on the embedded Linux system. Beetween the image sensor and the system memory,there is a quick capture interface.The interface receives the data from the image sensor,and converts the raw image data to a suitable format, and sends H.264 stream to the memory via the DMA channel. The result shows that the design can realize the real-time and high-definition image acquisition in a complicated environment. The advantage of this system is small volume, low power consumption and low cost. It can be widely used in agricultural and hydrological monitoring, intelligent transportation, security monitoring and intelligent home.

Design and Implementation of a New CNG Dispenser Control Platform

CNG dispenser is a kind of equipment which can provide CNG fuel filling services for CNG vehicles. This paper presents a novel design of CNG dispenser control platform. The hardware design of the circuit board includes ARM11 core-board and extended board, and the software design is based on the Embedded Linux system, including the development of Linux drivers and applications. The new platform not only has better processing performance in basic functions like filling fuel, but also has excellent scalability such as network support and more humanized operation mode.

Design and Applications of Embedded System in Video Surveillance

In this paper, we select the ARM11 S3C6410 processor and embedded Linux system using the system needs to build a development environment. Studied in the embedded Linux operating system USB video capture device driver modules, collecting network video surveillance system implemented by V4L2 driver framework. Video capture program primarily through ioctl system function calls to access V4L2 driver framework. Completion of real-time video transmission via RTP / RTCP protocol. In addition, the Web server development platform porting.

The Research on Fire Fighting System of Industrial and Civil Buildings Based on Network Video

With the rapid development of the electronic technology, multimedia technology and network technology, video surveillance system is going to the embedded, digital, networked direction. Taking full advantage of LSI and networks of scientific and technological achievements, the embedded video surveillance system achieves delicate volume, stable performance, facilitates the communication of the surveillance equipment.The project is in arm microprocessor platform, and porting embedded linux system in it. It completes video capturing, compression, transmission and control tasks. The hard devices select the ARM9 (S3C2410) as the main processor in the system; and the USB camera as the device of video capture. In order to reduce the cost of the product, Based on the architecture and with the open source software in linux, the whole embedded video surveillance system is implemented.

Selective Segment Initialization: Exploiting NVRAM to Reduce Device Startup Latency

We propose selective segment initialization (SSI) to exploit NVRAM to reduce the device startup latency. SSI locates a kernel binary image in byte-addressable NVRAM and boots the system using this image, eliminating the need to load it from storage. SSI also eliminates the process of decompressing and relocating the OS kernel image in embedded Linux system. The key technical ingredients of SSI are precisely identifying the kernel segments where contents are updated in the course of booting and selectively reloading only these sections each time the system reboots. The fresh copy of the sections can be maintained in NVRAM, NAND flash, NOR flash, etc. In our experiment, SSI reduced the size of the kernel binary image loaded from storage into memory by 90% and reduced the overall device startup time by 54%. This approach can be used not only for cold boot (with NVRAM) but also for warm boot, in which the contents of DRAM persist across the system restart.

Research on the Development of Smart Library Based on Embedded RFID Middleware

This research is mainly designed and implemented the RFID middleware based on embedded Linux system. This middleware uses compositive control framework for design and development, by doing this, it makes middleware function modules can be dynamically loaded, installed and uninstalled by plug-in application form, witch will improve the flexibility and stability of the use of the RFID middleware. In the complex event processing, the paper introduced Esper engine to promoted the ability to filter, analyze, aggregate and some other complex event processing to dulling with the tagged data. This paper realized the main function module design by strictly compliance with the ALE protocol witch is made by the EPC Global Organization. The RFID middleware in this article establish the interactive interface with the external application. This middleware application can be deployed on the embedded Linux system, and it has obtained the expected effect and function after the test of this middleware application.

Boot Process Analysis and Transplantation of Embedded Linux System

Since the boot code locates in the bottom of embedded system, so the design of boot code is the key technology and the important steps of system development during the development process of embedded system. Although the boot code supporting new framework has been updating, the boot code of manufacturer giving is an old version of a few years ago in the current market popular embedded products. So this paper analyzes the U-boot code commonly used and in the popular in detail, combining with the startup process of embedded Linux system, then, this paper gives a process, transplanting the new version of U-boot code using the UT6410 as development platform. On the basis of completing the basic function transplantation, this paper adds the network card and DNW. Experiments show that the new version of transplantation can run smoothly, and improve the efficiency of the system.

A Greenhouse Environment Monitoring Platform with Characteristic of Video Surveillance

This paper designed a greenhouse environment monitoring platform with characteristic of video surveillance by making full advantages of embedded Linux system and ARM11 chip. Based on embedded Linux and Qt/Embedded, an on-site greenhouse environment monitoring software was developed. It provided a friendly human-machine interface, combined with a variety of network communication technology, analysed the collected data intelligently and finally created optimal environment for crop growth by running Multiple factor coordinated control algorithm automatically. Leveraging the camera and the built-in multi-format codec, a video surveillance system was developed to monitor the crop environment and growth in greenhouse. Thereby, our platform integrated an environment monitoring system and a video surveillance system. The experimental results show that the platform runs stably in parallel, data transmission is highly reliable, the digitalization and visualization of greenhouse is achieved efficiently. The platform has wide application value.

A Greenhouse Environment Monitoring Platform with Characteristic of Video Surveillance

This paper designed a greenhouse environment monitoring platform with characteristic of video surveillance by making full advantages of embedded Linux system and ARM11 chip. Based on embedded Linux and Qt/Embedded, an on-site greenhouse environment monitoring software was developed. It provided a friendly human-machine interface, combined with a variety of network communication technology, analysed the collected data intelligently and finally created optimal environment for crop growth by running Multiple factor coordinated control algorithm automatically. Leveraging the camera and the built-in multi-format codec, a video surveillance system was developed to monitor the crop environment and growth in greenhouse. Thereby, our platform integrated an environment monitoring system and a video surveillance system. The experimental results show that the platform runs stably in parallel, data transmission is highly reliable, the digitalization and visualization of greenhouse is achieved efficiently. The platform has wide application value.

WiFi Wireless Video Transmission Technology's Application in Intelligent Home

This Paper takes WiFi wireless video transmission as the technical basis, realized a remote WiFi video system through embedded Linux system, and successfully applyed it in the intelligent home control.The WiFi module is based on IEEE802.11n wireless protocol, which improves the highest transmission rate to 300 Mbps. Wireless camera capture video data and use H.264 to encode it, which greatly reduces the consume of the wireless bandwidth.The PDA terminal is implemented to comunicate with embedded Linux system via TCP/IP protocol, while the data is encrypted by TLS/SSL protocol.

Design of Solar Collector Tubes Thermal Performance Parameters Detection Device on Embedded Linux

This paper illustrates detection principle and detection method of thermal performance parameter of solar collector tubes, design a device to detect thermal performance parameter of solar collector tubes. This device adopts S3C2440 microprocessor which is developed with ARM920T core and embedded Linux system as hardware platform and develops the application program. This device could achieve real-time multitasking function detection of the thermal performance parameter of solar collector tubes, at the same time the device will transfer the data to computer via LAN communication. Due to the application of ARM and embedded Linux system make the intellectualized degree and operating speed of the device improved greatly, while it can realize real-time multitasking function.

Development of MPC8247 embedded Linux system based on device tree

Concerning the MPC8247 target system based on PowerPC,the device tree was discussed and an embedded Linux system was developed,including the transplant and deployment of U-Boot,Linux kernel,Device Tree Blob(DTB) and Ramdisk file system.The actual operation of the system shows that the device tree file is correct,and the system design is rational and efficient.

A Novel Design of the CNG Dispenser Electronic Control System

This paper presents a novel design of the CNG dispenser electronic control system. The hardware design includes the ARM11 core-board and the expansion board, and the software design is based on the embedded Linux system with QT Embedded and SQLite. In addition to the general function as filling natural gas, the system has the GUI designed for touch input, the embedded database, and equipped with a RJ45 cable network interface, WiFi wireless network interface and RS485 interface etc.