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In communications, radar, sonar, and so forth, perfect arrays play fairly important roles. In this paper, we will investigate the construction methods of such arrays over the 8-QAM+ constellation. More clearly, for a given existing perfect ternary array (PTA), we will present two methods to convert it into an 8-QAM+ perfect array, depending on the existence of odd number in its size or not, respectively...
Generating region outlines from grayscale images using contour generation algorithms is one of the basic methods for image segmentation. The results can be used in 3D reconstruction from contours. The algorithm proposed in this paper which uses templates can effectively deal with the cases when contours pass through grid points and reach image boundaries.
Recently, attention has been paid to tracking methods using sparse representation. Assuming that the representation residuals follow Gaussian distribution, the multi-object tracking methods based on sparse representation are proposed. However, these methods are sensitive to outliers such as occlusion due to the assumption of Gaussian distribution. In our paper, a novel sparse representation based...
In imaging process of digital cameras, digital number (DN) of images is often automatically compensated for effectiveness of human vision. In this study, DN correction based on gamma transformation theory is combined with a look-up table method to convert the output DN into a calibrated digital number (cDN). Then, the leaf area index (LAI) of paddy rice is estimated from gap fraction measurement in...
The impact of depth map compression on synthesized virtual view quality is analyzed. We take the view synthesis experiment for depth map and color image symmetric and asymmetric compression. The results demonstrate that the depth map is less important than the color image in view synthesis. When the color image compress at the fixed index, keep the depth map compression within a certain range, the...
During the groups of decision making progress, according to the preference requirement that decision-makers emphasized and the vagueness of the evaluation information, this article describes how to use a method based on two-tuple linguistic to rank the weightiness of the competitive intelligence evaluation indexes and convert qualitative assessment to quantitative evaluation. Using this method, the...
Aiming at the high accuracy and speed requirements of images registration for multiband data or hyperspectral data, a new method which combines scale invariant feature transform (SIFT) with vegetation index analysis is put forward. Firstly, feature points extracted by SIFT algorithm are classified into two sets — points on vegetation area and points on non-vegetation area, which is based on vegetation...
Image blur assessment has always played an important role in the image quality assessment (IQA). In fact, many methods have been used to measure the blur of an image, but we find that lots of the traditional methods can't effectively compare the blur among images with different contents, leading to the blur measuring more difficult. Recently, we find a perfect method based on the idea that it is difficult...
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