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Three-dimensional imaging can provide more detail information of the target than two-dimensional image, which can be used to identify the target. Thus, it is very useful for detecting in enclosed structures or behind the obstacle. This paper mainly research on the three-dimensional through-the-wall human imaging and introduce an approximate method to calculate the propagation delay when electromagnetic...
Multiview stereo image composition mainly depends on the type of the multiview stereo display device. Currently, multiview LCD optical plate autostereoscopic display device is common in the art, while the composition method is limited. A new general multiview LCD stereo image composition method is proposed in this paper based on the optical plate LCD stereo display device. The proposed method mainly...
Finding the area of an object from image is an essential problem in many applications of machine vision, but there is usually error in area measurement because of defocus. In this work, influence of defocus on area measurement has been researched experimentally and theoretically. The results of experiment show that the relative error is 31.3% when the object plane deviates 10mm from conjugated plane...
This paper proposes a free-viewpoint imaging method that can be used in a complicated scene such as an office room by using sparsely located cameras. In our method, a free-viewpoint image is generated from multiple image patches obtained by dividing observed images. The quality of the generated image strongly depends on how to divide the observed images. In an incorrect patch in the generated image,...
This paper presents a multi functional range finder employing dual imager core on a single chip. With a combination of the light-section method and the stereo-matching method, our range finder achieves three modes, which are 2-D imaging mode, high speed 3-D imaging mode and high accuracy 3-D imaging mode. In 2-D imaging mode, 8 bit gray scale imaging speed is 58 fps, in high speed imaging mode, maximum...
Neutrons can travel considerable distances through the air, and can be used for stand-off detection of special nuclear materials. Plutonium emits neutrons by spontaneous fission, while uranium can be induced to fission by active interrogation with either energetic photons or neutrons. Traditional neutron detectors consisting of 3He tubes embedded in polyethylene moderator do not record the directions...
In this paper, a procedure for the systematic, generic and reproducible calibration of 3-D time-of-flight range imaging cameras is proposed. First, the effect of a number of internal and environmental influence factors is studied. Internal factors include the illumination radiation pattern, inner temperature and pixel integration period. Environmental factors are the ambient temperature, light, and...
Contactless human-machine-interfaces (HMIs) are an important issue in various applications where a haptic interaction with an input device is not possible or not appropriate. Newly developed Time-of-Flight cameras provide 3D information of the observed scene in real-time at constant lateral resolutions of thousands of pixels. Additionally, a gray-value image of the observed scene is available. Our...
In image processing, the curve comparisons can be achieved by extracting the curve information from the bitmapped images. The revealed curves are represented in the forms of the sets of pixel information. Thus, the determination of curve matching is to compare pixel by pixel, which is time consuming. On the contrary, for vector graphics images, there have been no methods written in the literatures...
Aerial Hyperspectral imaging techniques are considered to be much more accurate due to the high spectral resolutions, but the sensors and relevant techniques require higher cost for the users. The goal of this paper was to identify the most effective wavebands of hyperspectral images for the wetland vegetation mapping. A aerial hyperspectral imaging system with a imager of 64 wavebands ranging from...
This article presents a new method based on video images to measure the speed of vehicles. The working principle is taking two instantaneous tandem photographs. Then based on the location of the vehicle and CCD, with reference to the advance calibration lines, we can obtain speed of vehicle. Further, this paper analyses two measurement errors, and discusses how to choose the picture filming location...
In this paper the staring infrared imaging system process is divided into two stages, the one is related with the target distance, another with the sensor only. The apparent radiance of the airborne target and the expression between the pixel gray and the apparent radiance were deduced based on each stage respectively. Then the aerial surface target distance was deduced based on the single-station...
This paper demonstrates the design of a two dimensional nanoholes array opto-fluidic microscopy (OFM). Contrary to previous OFM designs, our design captures accurate real-time images of biological samples flowing in a microfluidic channel. In addition, the enhanced design allows us to monitor the flow of micro-organisms by continuously acquiring images with acceptable frame rate. Details of the enhanced...
Contrast agents are used in ultrasound imaging to enhance blood region and thereby separate the perfused area and the surrounding tissues. But unfortunately the signals backscattered from agent and tissues are still close. So it is necessary to implement signal processing to enhance the contrast echo. In this article, we apply the autoregressive model to exploit the nonlinear behavior agent properties...
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