The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Image registration is to find the transformation parameters between images, which is in order to eliminate or reduce the image nonlinear or linear deformation caused by the imaging equipment or imaging conditions. In this paper, an image registration model based on the relationship of geometric projection imaging is established. First of all, proposed a calibration method based on planar pattern,...
Industrial mechanical arm is widely used in aircraft manufacturing such as aircraft skin drilling and riveting. However, due to the open-loop controlling of the mechanical arm, the positioning precision cannot meet the high accuracy requirement in aircraft manufacturing. Therefore, this paper proposes a novel automatic tracking approach by using monocular vision technology. Due to the uncertain attitude...
We use carrier frequency interferometry to determine the radius of curvature of amorphous thin films deposited onto thick substrates with high accuracy with a relatively simple setup.
With the construction of highway in China, the transportation industry is gradually stepping into the maintenance stage. Whereas the current linear stake number method cannot accurately locate the pavement disease, the road identification theory is introduced to solve the problem of locating pavement disease and the chain scission on highway effectively. However, it has brought many difficulties to...
Most present-day imaging devices are equipped with CMOS sensors. Motion blur is a common artifact in handheld cameras. Because CMOS sensors mostly employ a rolling shutter (RS), the motion deblurring problem takes on a new dimension. Although few works have recently addressed this problem, they suffer from many constraints including heavy computational cost, need for precise sensor information, and...
Shutterless frame store charge-coupled devices (CCDs) are commonly used in ground-based solar observations, but the characteristical readout smear error of such devices hinders an application of frame store CCDs to autonomous missions. The combination of polarimetric modulation and image accumulation disables a correction of this error via software-based post-facto processing if in addition microvibrations...
Laser Wakefield Accelerators (LWFA) allow substantial miniaturisation of radio-frequency synchrotrons, enable development of table-top X-ray and γ-photon beam sources and dramatically increase the access possibility of universities and research establishments to the advanced photon sources used in biomedical, physics and material science research [1]. The coherence and brightness of the secondary...
This paper presents an satellite camera imaging system using area CCD based on FPGA. FPGA was adopted to act as a center unit to generate timing logic signals of the CCD and control the A/D converter, etc. The three-wire serial interface is used to communicate with the management and control system on the satellite. The image data of the CCD is coded by the imaging system and converted to the required...
In this work a preliminary study is proposed to assess the validity of an automatic and low cost measurement method for Functional ReachTest (FRT) implementation. To this aim FRT was performed on 10 trials of 4 healthy men and results from the system under validation are compared with the corresponding data from a calibrated stereo-photogrammetric system: the percentage variation between them is lower...
Attitude measurement error is one of the main factors that deteriorate the imaging accuracy of laser scanning. In view of the fact that the inertial navigation system (INS) with high accuracy is very costly, a low-cost but effective attitude determination method based on target images was proposed to measure the platform attitude for laser scanning in this paper. Based on the relationship between...
Surveillance is becoming more and more important in the recent years. In many cities, cameras have been set to look after parks, streets, roads, facilities and so on, however this fact is rising concerns about privacy. In this work, an alternative surveillance method which gather at once security and privacy has been propose and tested. Based on fiber optic specklegram technology; a system consisting...
As India is progressing so the infrastructure as well as the transportation such as roads, technologies are also developing. The transportation plays a vital role in Indian economy. As we know many people have lost their lives in the accident. So managing the lane system on the road for the vehicles is very important. We can provide safety by using the lane detection system and also guide people for...
The theoretical analysis of dark currents of area charge-coupled devices (CCD) and CMOS image sensor at high temperatures from 60 to 150 degrees Celsius is carried out. It is shown, that reduction of accumulation time reduces dark currents of photodiodes. Transfer registers dark currents is dominating component in area CCD and defined by temporary parameters of scan. In CMOS image sensor with global...
In this paper, we focus on studying the effects of various image operations on sensor fingerprint camera identification. It is known that artifacts in the image processing pipeline, such as pixel defects or unevenness of the responses in the CCD array as well black current noise leave telltale footprints. Nowadays, camera identification based on the analysis of these artifacts is a well established...
A series of images of the whole wheel surface was captured by the imaging system. Median filtering and image contrast enhancement were used on the defect images, and then canny edge detection based on gradient histogram was done in further details. The images after edge detection are used for eight-neighbor boundary tracking, to obtain the sizes in-pixel of defects. The experiment system is set to...
Image Quality Assessment has already drawn growing attentions due to its crucial role in different image processing applications. Among these satellite image processing methods, image quality assessment is quite important because images may contain many different types of noise like blur, radiated noise, stray light, et.al., which have a bad effect on the subsequent image processing. In this paper,...
The technique is applied for capturing the surface image of a golf ball. The mechanisms involved in this study to design include: 6 CCD cameras, positioning control mechanisms, lighting devices. Mechanisms to position the camera view angles are required for design. Included in the design is XYZ positioning and rotational mechanism of the ball orientation. This study gives a prototype design and the...
This paper presents hardware and software solution for simulation of a group of cameras used by the PLATO satellite. The simulator can be configured either to work with the scientific processing unit or as the complementary loop attitude control processing unit. Configuration and monitoring can be performed remotely, which caters to cooperatively work and guarantees traceability for quality purposes...
Important considerations to major components like cameras, optics, and illuminators of an in-line photoluminescence imaging system to detect micro-cracks in crystalline silicon solar cells are presented. A compromise between image resolution and speed is needed when designing a practical machine vision inspector. Generally, CCD cameras are preferred since they are relatively cheaper compared to InGaAs...
Welding is a process of joining two or more substances that are based on the principles of diffusion processes, resulting in unification on the materials to be joined. The strength of the weld joint is determined by several parameters, including the weld bead width and the penetration. The width of the weld bead especially the upper part can be determined by looking directly through the CCD (Charge-Coupled...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.