Papers by Keyword: Image Acquisition

Abstract: For precise assembly of miniature parts, the precise inspection for parts’ posture and real-time servo control for assembly greatly depend on the performance of visual inspection system. This paper proposed a high-resolution real-time visual inspection system of micro assembly. The CMOS image sensor and high-speed digital signal processing chip were chosen to design the image acquisition module, image processing module and image display module. High-accuracy display on the common display device was implemented with the video encoding chip and FPGA. The test results showed that the processing speed with preprocessing could reach 3.5 frames per second with 5 mega-pixel resolution, and the display accuracy after threshold processing had little loss. Micro parts assembly experiment and high accuracy Peg-in-Hole assembly experiment are done to test the performance of the proposed visual inspection system. This visual inspection system can be used for high-resolution real-time micro assembly and other real-time visual servo control.

Abstract: For the needs of laser autocollimator in image acquisition and processing, designed the hardware circuit based on FPGA and DSP as the control core, detailed the system hardware composition. Image sensor initialization and configuration were elaborated, cached the image data by double buffering technique. By reading the cache data, pretreatment, spot extraction, calculating barycentric coordinates and data fitting, the high precision of angle measurement was obtained. The system design is reasonable, the hardware circuit is reliable, and the video capture image is clear. The functionality of image acquisition and processing is achieved.

Abstract: This paper introduces the hardware and programming involved in collecting the image of the digital code wheel by microprocessor STM32 directly driving camera chip OV7670 and the transmission of collected image. This design simplifies the hardware structure to the greatest extent and minimizes cost. Our design has three advantages. Fist, direct driving saves the intermediary register chip, simplifies the circuit and also reduces the amount of elements used. Second, by using the CMOS digital image sensor with windowing function—OV7670 to capture the image of code wheel we simplify the hardware structure and reduces the cost because of the D/A conversion circuit and complex programmable logic device contained in OV7670. Third, we successively solve the problem of the small capacity (20k) of STM32F103C8T6 chip’s SRAM by cutting out 24080 images from 640480. So time spent on data transmission and processing can be shortened.

Abstract: Image acquisition and wireless transmission is a key technology in the Internet of Things. This paper reports a ARM Cortex-M4 processor hand-held based Image acquisition and wireless transmission terminal. The terminal utilizes STM32F407VGT6 as its master controller, respectively. It uses Nordic nRF24L01 as its wireless transceiver module and OV9655 as its camera module. The system works in 2.4GHz ISM microwave band and can capture images and wirelessly transmit images within 20m indoors and 50m outdoors. The actual measurement of image acquisition and transmission shows that this terminal is highly stable and comparable in 2.4GHz microwave frequency.

Abstract: It designs an image acquisition system of the camera based on FPGA. It uses a CMOS image sensor as the sensitive chip and controls the timing of image collection by designing the FPGA. FPGA transfers captured image into a PC to display. It uses the I2C bus to initiate CMOS sensor. A problem of cross-clock is solved by asynchronous FIFO. By the ping-pong operation based on two SDRAM chips to solve the problem of high speed data cache. The FPGA chip communicates signal data with PC by Ethernet port. The experiment proved that the system is able to collect 2048×1536 resolution images in a speed of 12fps.

Abstract: Based on characteristics of image acquisition system of high-speed and large-capacity, this paper presents a CMOS Image sensor data acquisition system that is using FPGA Chip as its core processing devices. Data acquisition logic control unit is designed by FPGA. The modular structure of the system design, FIFO, ping-pong and other technology are used in the design process to ensure real-time data acquisition and transmission. FPGA implementation of video acquisition can improve system performance. It also has a strong adaptability and flexibility, and it is easy to design, debug and so on. Through the experiment, we can get a clear image.

Abstract: The conventional detection technology can not accurately determine the casing damage point and the corresponding physical condition. So it is difficult to determine the working solution. This paper introduces a logging tool which uses the C8051F040 as the main control chip controlling the CMOS cameras for image acquisition and the 2G high-capacity FLASH as the storage for the image information. The scheme has been proved feasible and the obtained image is direct and clear. It has great significance for the maintenance of casing well and the salvage of the objects.

Abstract: 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.

Abstract: Palm-print medicine is a discipline in traditional Chinese medicine (TCM), equivalent to thepalm-print diagnosis discipline and palm medicine. And it’s a meaningful work to combine the biometric identification technology with traditional Chinese palm-print medicine for the diagnosis of human diseases. According to the characteristics of palm-print images, this paper makes a simple summary of the key technology and core algorithm in the field of palm-print identification.

Abstract: On the aim of the designs and realizes of the high-speed image acquisition of FPGA and DSP systematic hardware platform, combine the actual requirement for the subject, on the basis of confirming systematic scheme and design of the system hardware circuit, finishing the design of the systematic printed circuit board and measure the realization of the algorithm on the edge. Including the overall arrangement of the circuit board, designs of the power and ground, design of electric capacity of decoupling, design of transmission line, etc. at last, provided the intact systematic circuit board picture, put forward a method to expand matrix outside, i.e. measure algorithms on the edge that holds the matrix law again. The systematic circuit is simple, dependability is good, the performance-cost ratio is fine, and has certain innovation and common.