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Xiangshan County is one of the most important areas in Zhejiang Province. The land use changes interpretion and its changing rules are the main aims of the paper. Firstly, for the classification system was the foundation of the study, it had to be built. Secondly, the tasks were the collection and preprocessing of the high resolution remote sensing images in 2009 and 2012. Thirdly, the interpretation...
Contour extraction of stone slabs is the first-step for optimization of cutting the irregular stone slab in real time. A color image segmentation method to extract the stone slab contour in the complex background is proposed. Firstly, we define a sample window and detecting window in HSI color image space, and extract the image feature of sample window as the prior knowledge. Traverse the whole image...
In this paper an efficient crop row detection method is proposed for vision-based navigation for agriculture robots. In the proposed method, no low level features (such as edges and middle lines of the images) are needed. So the complex algorithms for edging and matching (e.g. the Hough transform) are avoided, which greatly saves the computation loads. Instead, a flexible quadrangle is defined to...
As an efficient pre-processing technology, superpixel has been widely used in image segmentation, which improves the final results and reduces the complexity of the subsequent processing tasks. This paper presents an interactive image segmentation method based on the hierarchical superpixels initialization and region merging. It firstly proposes a novel hierarchical superpixels initialization framework...
Nowadays, image enhancement, image restoration and dehazing had made a great progress. This paper addresses the problem of dehazing which is a serious question in computer vision and consumer photography applications. Due to the weakness of the existing methods to compute an accurate transmission map, we use the binocular vision method to compute the depth map. We have used in this paper, the discrepancy...
This paper presents a watercolor rendering technique that recreates the artistic effects. Visual features make focused object apply different simulation value. The method is organized in two steps: Image abstraction based on the weight-map; Detail verisimilitude of watercolor features. Verisimilitude includes color space conversion, boundary region diffusion, morphological smoothing, and adding texture...
Clear underwater vision is crucial to many research and realistic applications in ocean engineering, ocean biology, and ocean science. However, owing to particular propagation properties of light beneath water, underwater images usually have poor quality including low contrast, blurring, darkness, and color diminishing. In this article, a new underwater image restoration algorithm is proposed that...
To overcome the problem of lacking apparent features, e.g. color or shape, in the process of identifying wheat stripe rust from powdery mildew using computer vision algorithms, a novel directional feature based on Improved Rotation Kernel Transformation (IRKT) is proposed. IRKT can calculate the statistics of the direction distribution of infected leaf images in spatial domain. The statistics calculated...
This paper presents an image mosaic technique using ORB (oriented FAST and rotated BRIEF) descriptor and an improved blending algorithm. Features of images with overlapping regions are first described by ORB descriptors. This binary descriptor outperforms SIFT and SURF in regard of processing speed. RANSAC algorithm is then applied to reject mismatches. Once the best projective deformation matrix...
In the context of stereo matching remaining a classical problem in computer vision, this paper presents a novel stereo matching algorithm based on ground control points using graph cut (GC). The proposed algorithm incorporates local and global stereo methods, initializes the disparity map with a local stereo approach in the first place on purpose of selecting GCPs (Ground Control Points), and applies...
Considering the emergence of Microsoft Kinect has attracted attention not only from customers but also from researchers in the field of computer vision. Nonetheless, Kinect-generated depth maps usually contain various holes, especially at the edges of the front ground. In order to fill in the holes existing in the depth map, some methods that adopted color map guided in-painting or joint bilateral...
In this paper, we present a supervoxel generation algorithm based on partially absorbing random walks to get more accurate supervoxels in these regions. A novel spatial-temporal framework is introduced by making full use of the appearance features and motion cues, which effectively exploits the temporal consistency in the video sequence. Moreover, we build a new Laplacian optimization structure with...
Gesture recognition is important in the humancomputer interaction. In this paper, a method for detecting fingertips and gesture recognition using Cubic B-Spline Curve Fitting is proposed. The main steps in the method include: skin segmentation, palm and fingertips extraction, gesture trajectory extraction. According to transform RGB color space to YCrCb, the region of hand can be extracted using OSTU...
This paper presents a non-photorealistic rendering algorithm for Pointillism style. At first, ellipse dots are adopted as rendering elements and their locations are randomly distributed on a target image. Then dots orientations are pre-calculated with guidance of a direction map. A saliency map of the source image decides long and short radius of the ellipse dot. At last, the dots render the canvas...
Considering the requirement for a more objective result of image retrieval, the features of image itself attract more and more attentions of researchers. Recently, the shape context of images is widely applied in image matching for its good invariance of translation and scale, as well as its good robust for small geometric distortion. Thus, the features of shape context are introduced in this paper...
In this paper, we propose LinedCut: a novel method for interactive image segmentation which requires only a single line drawing to identify the object of interest in the image. The handy interaction mode can address the problem of object scale very well. Our approach consists of the following three steps: first, a given image is over-segmented into superpixels using superpixel algorithm; secondly,...
Localization of multi-pose human facial features is one of the key issues in face recognition technology. The paper presents an algorithm to achieve the accurate positioning of facial features and the corresponding practical steps to realize it. Firstly, we establish the chrominance component mapping function of the feature points based on the chrominance information of high Cb and low Cr values around...
In this paper, a simple and fast algorithm was proposed to detect face. Firstly, some interest points marking skin regions were searched by only using simple chrominance Cr information instead of simultaneously using chrominance Cr and Cb. And then, a conventional and popular AdaBoost algorithm was employed to make a decision whether around the detected interest points was there face and then located...
A new metric is proposed to predict the perceived crosstalk using crosstalk level and original images rather than using the original and ghosted images. Our metric fully utilizes the color information of original image. We first extracted disparity map, color difference map and color contrast map from original stereo images. Then these information together constructs new metrics, which have high correlations...
Color image segmentation is an important topic in the image processing field. In most segmentation methods based on MRF-MAP, the segmentation quality is far behind requirement due to the absence of appearance models, and it is often suffering from the low computational efficiency of iterated calculations. To address these problems, the paper proposes a new segmentation method for color images based...
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