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1.
Flower image retrieval is a very important step for computer-aided plant species recognition.In this paper,we propose an efficient segmentation method based on color clustering and domain knowledge to extract flower regions from flower images.For flower retrieval,we use the color histogram of a flower region to characterize the color features of flower and two shape-based features sets,Centroid-Contour Distance(CCD)and Angle Code Histogram(ACH),to characterize the shape features of a flower contour.Experimental results showed that our flower region extraction method based on color clustering and domain knowledge can produce accurate flower regions.Flower retrieval results on a database of 885 flower images collected from 14 plant species showed that our Region-of-Interest(ROD based retrieval approach using both color and shape features can perform better than a method based on the global color histogram proposed by Swain and Ballard(1991)and a method based on domain knowledge-driven segmentation and color names proposed by Das et al.(1999). 相似文献
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A flower image retrieval method based on ROI feature 总被引：1，自引：0，他引：1
INTRODUCTION There are about 250000 named species offlowering plants and many plant species that havenot been classified and named. Plant classificationand identification is a very old field. So far, thistime-consuming process has mainly been carriedout by taxonomists and/or botanists. A significantimprovement can be expected if the plant identifi-cation can be carried out by a computer automati-cally or semi-automatically with the aid of imageprocessing and computer vision techniqu… 相似文献
3.
A color based system using multiple templates was developed and implemented for detecting human faces in color images. The
algorithm consists of three image processing steps. The first step is human skin color statistics. Then it separates skin
regions from non-skin regions. After that, it locates the frontal human face(s) within the skin regions. In the first step,
250 skin samples from persons of different ethnicities are used to determine the color distribution of human skin in chromatic
color space in order to get a chroma chart showing likelihoods of skin colors. This chroma chart is used to generate, from
the original color image, a gray scale image whose gray value at a pixel shows its likelihood of representing the skin. The
algorithm uses an adaptive thresholding process to achieve the optimal threshold value for dividing the gray scale image into
separate skin regions from non skin regions. Finally, multiple face templates matching is used to determine if a given skin
region represents a frontal human face or not. Test of the system with more than 400 color images showed that the resulting
detection rate was 83%, which is better than most color-based face detection systems. The average speed for face detection
is 0.8 second/image (400×300 pixels) on a Pentium 3 (800 MHz) PC.
Project (No. 60203013) supported by National Natural Science Foundation of China 相似文献
4.
MOTIVATION Iris recognition, widely accepted as one of the best biometrics recognition methods in the world because of its stability, uniqueness and noninvasive-ness (Adler, 1965; Daugman, 1993; Ma et al., 2002; Wildes, 1997), has the potential of applications in very wide areas. As a kind of pattern recognition to classify the iris correctly by comparing the similarity between irises, two major works are: (1) to find the appropriate features to represent iris properly; and (2) to classi… 相似文献
5.
Example based painting generation 总被引：1，自引：0，他引：1
GUO Yan-wen YU Jin-hui XU Xiao-dong WANG Jin PENG Qun-sheng 《浙江大学学报(A卷英文版)》2006,7(7):1152-1159
INTRODUCTION Non-photorealistic rendering (NPR) is a domain of computer graphics that has received more and more attention in the past decade. Different from realistic rendering, NPR concentrates on communicating the main context of an image and explores the rendering effect of the scene with the artistic styles, rather than seeking subtle geometry details and naturally physical attribute. Many research efforts were dedicated to simu- lating the traditional media (Hertzmann et al., 2001… 相似文献
6.
利用肤色在RGB、YCbCr和HSV空间中均有较好的聚类性质,以及模糊隶属度函数快速构造得到图象的肤色投影图;使用Active Contour的level-set算法对肤色投影图进行分割合并得到初步肤色侯选区域;再使用K均值方法对初步侯选区域进行修正,得到同质肤色区域。实验证明算法对简单,复杂背景下的单人脸和多人脸肤色区域分割均有较好的效果。 相似文献
7.
陆学松 《重庆职业技术学院学报》2009,18(1):77-79
费密,明末清初重要的遗民诗人,他的诗歌具有极高的艺术成就和历史价值。由于时代和自身的因素．费密的诗歌在整体上表现出清疏健雅的诗歌风貌。这种风格形成与费密诗歌中意象体系的构建有很大的关系。在意象的色调上,费密喜欢青、白等冷色调,在意象的选择与体系构建上,费密诗歌表现出“清”、“疏”特色。 相似文献
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INTRODUCTION The popularity of digital images is rapidly in- creasing due to improving digital imaging technolo- gies, and convenient availability facilitated by the Internet. Organizing these images into categories and providing effective indexing is imperative for real- time browsing and retrieval. Typically, existing im- age classification work such as that of Vailaya et al.(2001) follows the paradigm of content-based im- age retrieval (CBIR) technologies, i.e., representing images u… 相似文献
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提出了一种新的考虑到HIS颜色空间和颜色纯度的多尺度遥感影像分割方法.使用HIS颜色空间来取得像素的颜色信息.当饱和度和亮度值较低时,色调值会非常敏感,用颜色纯度作色调值的加权值.不但考虑了像素的属性,还考虑了像素集合的属性.图像先被根据特定尺度分割成不同的区域对象,各个区域对象的平均值和方差值作为区域对象的属性.用区域对象特性和相对位置信息把小的对象合并到大的对象中. 相似文献
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SHIHTimothyK. CHANGRong-chi 《浙江大学学报(A卷英文版)》2005,6(6):487-491
INTRODUCTION Video sequences can be interfered with by noise.When the noise ratio of a video is high,even though itis not possible to restore the original,to repair videoframes or damaged artifacts with visually good resultis a hopefully achievable goal(see example in Fig.3),especially for archival resources in digital museumprojects.One of the simplest but efficient mecha-nisms is presented in(Oliveira et al.,2001).The dif-fusion kernel can repair damages of small area with abarrier to … 相似文献
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Most existing methods for image copy-move forgery detection(CMFD)operate on grayscale images. Although the keypoint-based methods have the advantages of strong robustness and low computational cost, they cannot identify the flat duplicated regions without reliable extracted features. In this paper, we propose a new CMFD method by using speeded-up robust feature(SURF)in the opponent color space. Our method starts by converting the inspected image from RGB to the opponent color space. The color gradient per pixel is calculated and taken as the work space for SURF to extract the keypoints. The matched keypoints are clustered and their geometric transformations are estimated. Finally, the false matches are removed. Experimental results show that the proposed technique can effectively expose the duplicated regions with various transformations, even when the duplication regions are flat. 相似文献
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JOHN J. HORAN 《Counselor Education & Supervision》1972,11(3):162-170
The ultimate criterion of counselor competence is generally recognized as the ability to effect adaptive changes in the cognitive, affective, motor, and/or somatic behavior of clients. Counselor preparation programs, therefore, ought to be organized to facilitate and insure the acquisition of this capacity. Systems analysis offers a useful approach for the redirection of counselor education. The formulation of high fidelity training objectives stated in terms of what the counselor candidate will be doing as a result of instruction is an intrinsic part of the systems approach. 相似文献
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监测与控制钉螺生长区域,对有效控制血吸虫病疫情的传播和蔓延作用十分重要.采用数字图像识别技术,可以高效地实现对钉螺生长区域的监控.面对杂乱、图像部分遮挡、光照变化等复杂背景下的钉螺数字图像识别,提出了解决方案:首先,提取钉螺数字图像的SIFT特征向量集;然后,应用K均值聚类获取更具代表性的特征子集,作为分类器的训练样本集;最后,通过支持向量机方法获得分类器,用于识别钉螺数字图像.实验结果表明,提出的方法能够获得较好的识别效果. 相似文献
14.
INTRODUCTION Support Vector Machine (SVM) is a relativelynew soft computing method based on statisticallearning theory presented by Vapnik (1995). In SVM,original input space is mapped into a high dimen-sional dot product space called feature space in whichthe optimal hyperplane is determined to maximize thegeneralization ability of the classifier. The optimalhyperplane is found by exploiting a branch ofmathematics, called optimization theory, and re-specting the insights provided by … 相似文献
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Diagnosis and treatment of breast cancer have been improved during the last decade; however, breast cancer is still a leading cause of death among women in the whole world. Early detection and accurate diagnosis of this disease has been demonstrated an approach to long survival of the patients. As an attempt to develop a reliable diagnosing method for breast cancer, we integrated support vector machine (SVM), k-nearest neighbor and probabilistic neural network into a complex machine learning approach to detect malignant breast tumour through a set of indicators consisting of age and ten cellular features of fine-needle aspiration of breast which were ranked according to signal-to-noise ratio to identify determinants distinguishing benign breast tumours from malignant ones. The method turned out to significantly improve the diagnosis, with a sensitivity of 94.04%, a specificity of 97.37%, and an overall accuracy up to 96.24% when SVM was adopted with the sigmoid kernel function under 5-fold cross validation. The results suggest that SVM is a promising methodology to be further developed into a practical adjunct implement to help discerning benign and malignant breast tumours and thus reduce the incidence of misdiagnosis. 相似文献
16.
黎杨梅 《襄樊职业技术学院学报》2012,(5):26-29
目前抠像技术已被广泛使用,运用了键控技术,用其它背景画面替换实际背景,实时进行合成并对目标物体图像进行效果处理。抠像是把图像中需要的信息保留下来,把不需要的信息去除或换成其它图像。传统硬件抠像实际使用中成像效果差,本文基于实践,探讨了传统硬色键和改进的软色键的抠像算法。 相似文献
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受彩色多普勒超声影像工作设备的限制,彩超图像作为医(疗)学辅助证据一般采用传统的算法(诸如空域增强中的直方图变换或频域增强中的小波变换)进行增强,而直方图变换后的彩超图像失真度过大,小波变换的参数调试更为繁琐。为此,本文提出了一种改进细菌觅食优化的图像增强算法。首先将彩超图像转到HSV颜色空间中,而后利用熵视觉显著性机制对亮度分量进行处理,以便获得显著性点集,将其作为细菌觅食优化初始菌群的候选集合,根据随机佳点理论抽选出合适的菌群点集后,对不完全Beta函数中的两个调节因子进行寻优,确定最优参数,最后将增强后的亮度分量整合色调分量和饱和度分量,并转回到RGB颜色空间中,得到增强后的彩超图像。文中的数据来源于某医院彩超诊断室,经MATLAB仿真测试后,证明所提算法同模因及杜鹃优化算法相比,峰值信噪比平均提高了7.29分贝,且具有良好的主观分辨效果。 相似文献
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Model comparison is one useful approach in applications of structural equation modeling. Akaike’s information criterion (AIC) and the Bayesian information criterion (BIC) are commonly used for selecting an optimal model from the alternatives. We conducted a comprehensive evaluation of various model selection criteria, including AIC, BIC, and their extensions, in selecting an optimal path model under a wide range of conditions over different compositions of candidate set, distinct values of misspecified parameters, and diverse sample sizes. The chance of selecting an optimal model rose as the values of misspecified parameters and sample sizes increased. The relative performance of AIC and BIC type criteria depended on the magnitudes of the parameter misspecified. The BIC family in general outperformed AIC counterparts unless under small values of omitted parameters and sample sizes, where AIC performed better. Scaled unit information prior BIC (SPBIC) and Haughton's BIC (HBIC) demonstrated the highest accuracy ratios across most of the conditions investigated in this simulation. 相似文献
20.
Kevin Woods 《British Journal of Special Education》2004,31(3):122-127
In England, Wales and Northern Ireland, the General Certificate of Secondary Education (GCSE) was designed as an 'inclusive' qualification, access to which has been supported by providing a 'reader' to some candidates during examinations. A candidate reading age criterion of ten years has been employed by the GCSE awarding bodies to determine eligibility for this provision. In this paper, Kevin Woods, a member of the Educational Support and Inclusion Research and Teaching Group in the Faculty of Education at the University of Manchester, examines the rationale and evidence for adopting this criterion and describes an investigation of the reading needs of a cross-sectional sample of 38 GCSE examination candidates in trial examinations. The investigation found a low level of candidate need for a reader, with candidate reading age and self-prediction being unreliable indicators of this need. Kevin Woods highlights the implications for the assessment process used to determine eligibility for a reader in GCSE examinations and pays particular attention to the feasibility and validity of including all students as eligible. 相似文献