共查询到20条相似文献，搜索用时 500 毫秒
1.
A vision system based on the service robot is involved. In the system, picture signal is acquired by the picture sensor OV7635. Frame memory AL422B is used as data buffer memory, while CPLD controlled the time order DSP performed. In the software system of image processing, to accomplish color image segmentation and recognition, the threshold vector judgment and improved seed-fill algorithm is introduced, and the image geometric moment is calculated during the segmenting. In order to achieve a vision servo system which composed of image-based feedback and adaptive compensation, the deduced matrix-based Jacobian from the image moment is taken as image feature. Adopted the TFT LCD is adopted to straightly disolav the result of vision recognition and vision tracing. 相似文献
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A robust method to compensation illumination of driver video color image to enhance image quality has been proposed. Firstly, the original image is decomposed into high-frequency image and low-frequency image based on spatial image decomposition. The illumination information is completely contained in the low-frequency image. Next, low-frequency image is compensated by using Retinex approach which can brighten the darker area. Then, the compensated low-frequency image and high-frequency image are synthesized. Finally, new image is obtained by illumination balance of synthesized image. Results show that the algorithm has better results compared with the traditional algorithm. 相似文献
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根据鲜香菇图像特点和分级标准,运用计算机视觉技术和神经网络算法对香菇进行自动检测与分级。采用掩模去背景、中值滤波、边缘亮度补偿等技术对图像进行处理。选取香菇菇盖最大直径、圆形度、色调均值及缺陷区域总面积与香菇图像总面积的比值作为鲜香菇分级的特征参数。通过BP神经网络建立了特征参数与鲜香菇等级之间的关系模型,试验结果表明,其预测识别结果达到94.2%。 相似文献
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X-ray computed tomography (CT) is an effective noninvasive tool to visualize fresh agricultural commodities’ internal components and quality attributes, including those of chestnuts (Castanea spp). There is no procedure to automatically, effectively and efficiently classify fresh commodities from a continuous inline flow through a CT system. If the information obtained by CT scanning of fresh agricultural commodities is to be used in an industrial application (e.g. inline sorting), automated interpretation of CT images is essential. For this purpose, an image analysis method (algorithm) for the automatic classification of CT images obtained from 2848 fresh chestnuts (cv. ‘Colossal’ and ‘Chinese seedlings’), during the harvesting years from 2009 to 2012, was developed and tested. Classification accuracy was evaluated by comparing the classes obtained from six CT images per chestnut to their internal quality assessment. An experienced human rater performed internal quality assessment by visually and invasively rating fresh chestnut internal decay severity (quality) into 5-, 3- and 2-classes.After CT image preprocessing, cropping and segmentation, 1194 grayscale intensity and textural features were extracted from six resultant CT images per sample. Relevant features were selected using a sequential forward selection algorithm with the Fisher discriminant objective function. 86, 155 and 126 features were effective in designing a quadratic discriminant classifier with a 4-fold cross-validation with a performance accuracy of 85.9%, 91.2% and 96.1% for 5, 3 and 2 classes, respectively. This method is accurate and objective in determining fresh chestnut internal quality, and the methodology is applicable to automatic noninvasive inline CT sorting system development. 相似文献
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A novel multifocus image fusion method based on lifting stationary wavelet transform (LSWT) is proposed. The selection principles, namely fusion rules of different subband coefficients, are discussed in detail. Local feature contrast is presented according to the human vision system (HVS), which is highly sensitive to the local image contrast level. Then, the fusion rule for the low-frequency subband coefficients fusion is introduced. To choose the high frequency subband coefficients, another local feature contrast is developed according to the human vision which is often sensitive to edges and directional features, but insensitive to real luminance at independent positions. Then, a novel fusion rule is proposed for fusion of the high frequency subband coefficients. Experimental results demonstrate that the proposed image fusion method is effective and can provide better performance in fusing multifocus images than the traditional contrast-based image fusion algorithms in term of informal visual inspection and objective criteria in multi-focus image fusion. 相似文献
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It is possible to get high compression rate for the interrelationship between neighboring frames of moving pictures. The kernel of research on video compression is that the efficient image compression algorithm is adopted while the interrelationship between neighboring frames and time consumption is concerned to improve the compression efficiency. It is significant that motion compensation is applied to video compression, nevertheless it is too time consuming. A vector coding method based on wavelet transform is presented to avoid searching procedure of motion compensation. Simulation shows that high compression rate is achieved with less time consumption. 相似文献
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以天山北坡典型国营农场棉田为研究对象,探讨基于归一化植被指数(NDVI)的棉田土壤肥力质量评价方法.将棉花不同生育期表征长势的NDVI作为评价指标对棉田土壤肥力质量进行评价,再将NDVI与少量理化测定的土壤样点数据(有机质、有效磷含量等)共同作为评价指标,结合地统计方法与遥感影像聚类算法进行评价;并与完全基于土壤样品理化测定数据的评价结果进行比较、探讨基于NDVI评价方法对土壤肥力质量评价结果的准确性与可靠性.研究证明将NDVI与少量理化测定的土壤样点数据作为评价指标,能显著提高评价结果与棉田实际土壤肥力状况的一致性.基于NDVI的土壤肥力质量评价方法快速、简便,其评价结果可为研究绿洲棉田土壤质量及农业结构调整规划、耕地质量保护等提供科学依据. 相似文献
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提出了基于灰度-梯度共生矩阵结合机器视觉技术检测大米加工精度的方法。使用实验碾米机制备不同加工精度的大米样品,设计大米加工精度机器视觉检测系统获取不同加工精度大米样品图像,再利用灰度-梯度共生矩阵提取大米图像的纹理特征,采用逐步判别分析法构建Fisher判别函数组对大米样品的加工精度进行检测。试验结果表明:该方法对4种不同加工精度大米样品检测的平均准确率达到94.00%。 相似文献
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为探究水稻冠层外观特征与水稻氮素营养状况的关系,综述了应用计算机视觉技术进行水稻氮素营养诊断的基本思路及研究进展。主要分述了常规性水稻氮素营养指标的获取,水稻冠层图像的获取、预处理以及特征的提取与优化,水稻氮素营养诊断模型建立的方法等方面的内容。指出近地面水稻冠层图像的获取方法、水稻图像处理方法、多种综合性特征的优化选择方式都有待进一步研究,应用机器学习进行水稻氮素营养诊断建模的方法需要更加深入探究。今后应加大计算机视觉技术在水稻氮素营养诊断相关研究中的应用,将多种图像处理方法、特征优化选择方法与机器学习建模方法相结合,并探寻更为简便易行的方法进行水稻氮素营养诊断。 相似文献
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Image restoration is aimed to recover the original scene from its degraded version. Based on the customary regularization technology and the property of the human visual systems, a new method for image restoration based on adopted regularization technology is presented. This technique is achieved by adopting the parameters of the residual term and the regularization term of each pixel in different part of the image. We can get the parameters of each pixel by computing the local variance at each point. Simulation results demonstrate that the method improves restored image quality and does not slow down the convergence of the evaluation function. 相似文献
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Lin Yan Gu Hengyue 《保鲜与加工》1997,(2):113-116
A new method for assessing water quality is put forward by analyzing the shortage of the three present methods. The features of the new method are that the results of assessment coincide with the current standard of water quality in china,and that polluted degrels of water quality classification of assessment are also differentiated. 相似文献
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基于图像特征的收获前籽棉品级聚类融合分析 总被引：1，自引：0，他引：1
为客观评价收获前籽棉品级,依据籽棉品级国家标准,基于机器视觉在3个颜色空间中选取棉棉瓣大小、色泽特征用K-均值、竞争学习网络方法对7个品级的样本进行聚类融合分析。结果表明,亮度修正后特征之间极显著相关,Hunter颜色空间较好。肉眼对第1、2、7品级的识别率为73%~100%,3~6品级为26%~46%,总计47.7%;聚类融合对各品级的识别率为65%~100%,总计78.6%。聚类融合方法基于人类的先验知识,在更宽的视觉范围内更均衡所有特征,可克服个体聚类器的过度训练,能够客观地识别收获前籽棉品级,提高其采摘、收购质量。 相似文献
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弱光胁迫对植物生理特性影响的研究进展 总被引：1，自引：0，他引：1
摘 要：光是植物生长发育的重要因子之一,但由于设施环境对光照的限制,温室内往往产生弱光逆境,因此园艺植物弱光胁迫已成为育种领域研究的热点。本研究综述了弱光环境下各种植物的生长发育、光合特性、生理生化活性对逆境的响应,归纳出各项指标与产量之间的关系。目前,国内外的科学研究及生产实践表明,弱光胁迫下植物的叶绿体结构、酶活性、渗透调节物质、内源激素含量等是适应弱光逆境的关键因素。在此期间多项耐弱光机理的研究已获得突破性进展,但在植物的生长周期、地域及品种间的差异方面还无详细的论述。今后应当进一步探索植物的生长规律,尤其在弱光环境下的其他胁迫以及弱光基因的表达和调控方面展开更为深入的研究,为提高品种抗性及更多耐弱光品种的筛选提供参考。 相似文献
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Machine vision has been widely used in general, from industrial measurement to managing document, from medical graphic to remote sensing image and from micro technology to multimedia database, too numerous to mention one by one.As it were,where there is human vision,there is almost needs machine vision.Take "Two dimension Photomicrography Precision Measurement System" as a example,it illustrates the basic principle?fundamental structure of machine vision, gives us the present status and development trend of precision measurement in manufacturing, show us the successful application of machine vision for small size precision measurement in manufacturing,and the advantages of machine vision to accurate measurement. 相似文献
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Abstract:In the ultrasound imaging system, the main shortage of apodization technology is that, there is a better image resolution only in a limited region, out of the region, the resolution is significantly lower. The segment dynamic apodization can make up the shortcoming. After analyzing kinds of the 3dB isograms of the apodization function, the limited region with the best image resolution has been obtained. By way of sub leading into the relevant apodization function, the segment dynamic apodization technology is implemented and used to plot the 3dB isogram and simulate the image. Simulation results show that the proposed method of segment dynamic apodization technology, can improve the image quality effectively. 相似文献
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Digital watermarking is an effective method to provide copyright protection for digital media. A blind image- adaptive watermarking algorithm based on DCT domain is presented. The algorithm selects adaptively the step size of quantization to embed the watermark bits by modifying DC components via the human visual system model and local characteristics of image; at the same time some AC components of the blocks with less perceptual capacity are also modified to embed the same watermark bits by using quantization. Thus the relation between robustness and imperceptibility can be well balanced. The algorithm recovers the watermark without any reference to the original image. Compared with the similar algorithm reported in the literature, this method can give better image quality and is better robust against noise and commonly used image processing techniques. 相似文献
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Lin Yan Gu Hengyue Sun Yang 《保鲜与加工》1997,(1):38-42
A new method for assessment of ambient air quality is proposed by using matter element analysis.This model is simple and reasonable in assessment.The practical example is given,and compared with other methods. 相似文献
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环境质量影响指数法在商丘市土地整治规划环境影响综合评价中的应用 总被引：2，自引：1，他引：1
为了解决土地整治规划环境质量影响综合评价定量化的难题,探索简便易行的土地整治规划环境质量影响综合评价技术方法,以土地整治规划实施前后土地利用结构的变化为切入点,以规划实施对环境系统结构-功能-价值的影响为分析评价对象,构建了环境质量影响综合评价指标体系,建立了环境质量综合影响指数法定量评价模型,应用该方法对商丘市的土地整治规划进行了环境影响综合定量评价。评价结果表明,评价指标易于定量化取值,综合影响指数法评价模型简便易行,规划方案实施对环境质量综合指数的影响值为+11.76,规划实施对区域环境质量的影响总体是有利的,规划方案具有环境可行性。以规划实施对环境系统结构-功能-价值的影响为切入点,构建的环境质量影响评价指标体系针对性强、评价指标易于量化;环境质量影响综合评价模型法使评价工作得以大幅简化,实用性强,具有推广应用价值。 相似文献