基于图像显著性区域提取的垩白米检测

垩白度是衡量优质大米品质的重要指标,随着农业检测自动化发展,利用机器视觉准确检测大米垩白度对大米生产加工具有重要意义。针对现有算法在分割垩白区域时存在抗干扰能力弱、稳定性差以及准确度低等问题,本文提出了一种基于图像显著性区域提取的垩白区域提取算法。利用大米垩白区域图像显著性的特点,对图像特征变化边缘进行提取,计算出边缘像素点个数以及边缘的总像素值,从而计算出边缘像素的平均值作为该区域的阈值。最后,利用计算得到的阈值对该区域进行分割,分割出整张图片的垩白区域,并计算出大米的垩白度。实验结果表明,该算法识别准确率为96.76%,相较于传统的OTSU算法检测准确率平均提高了 26.87%,相较于改进的OTSU算法检测准确率平均提高了 7.26%。     

基于图像处理的稻米垩白自动检测研究

应用大津算法自动选取分割阈值,对稻米图像进行两次分割,分别得到籽粒和垩白区域的二值图像,再根据区域内部象素的连通性,将不同区域赋予不同的标记,计算出籽粒和垩白粒数,以及二者对应的面积(象素)。研究结果表明,该算法的自动检测结果与人工检测相关性大于90%,可用于稻米垩白粒率和垩白度的自动检测。     

基于嵌入式的稻米形态特性分析仪的开发

设计了一套基于嵌入式的稻米形态特性分析仪,针对优质稻米品质参数检测的实际需要,在设计稻米图像采集装置的基础上,系统以基于ARM内核的S3C2410平台为硬件开发环境,利用嵌入式Linux系统,通过USB图像驱动程序移植,实现了对稻米图像的采集及保存过程,在此基础上,结合图像处理与模式识别技术,编写相应的图像分析应用程序,获得稻米形态品质的国标参数,实现了对稻米整精米率、垩白粒率、垩白度、粒型的快速无损检测。     

基于图像处理技术的大米垩白度检测

垩白是衡量大米品质的重要指标之一.为了快速、客观、准确地检测垩白米粒,以实际应用为目的,利用最佳阈值先将大米从背景中分割出来,然后通过近似垩白的比色带确定分割垩白的最佳阙值,将垩白从大米中分割出来,通过计算垩白区面积与整粒米面积之比确定垩白米粒,并计算垩白度和垩白粒率,实现大米垩白度的自动检测.     

基于机器视觉的大米垩白米的检测方法

通过分析2种米粒的不同的直方图分布表现来区分普通米与垩白米,并进而对检测出来的垩白米粒采用改进的最大类间方差法来进一步分析其垩白率、垩白度等信息。试验采用了12组样本,每组样本60粒,按照不同的放置方向及位置,各采集10幅图像,共120幅图像。对所有图像进行检测,检测结果表明本研究提出的方法能快速,准确地区分垩白米粒及正常米粒,并且可以进一步较准确地检测垩白米粒的垩白度,相较于传统的OTSU算法,垩白米粒的检测准确率平均提高了8%左右,垩白度的检测准确率平均提高了6%左右。     

基于数字图像处理技术整米和碎米含量检测

为探讨数字图像处理检测整米和碎米含量的可行性,对米粒图像进行去噪及二值化处理,提取米粒长轴、短轴、周长和面积参数,在这些参数阈值下计算识别米粒的正确率,获得最佳识别阈值,确定识别参数,确定不同质量样品的整精米、大碎米、小碎米图像的长轴和、短轴和、周长和、面积和与样品质量之间的关系;建立了基于图像处理整米和碎米含量检测方...     

米质分析中应注意的问题

杨泽敏、王维金在粮油市场报上指出 :1 垩白米率、垩白度与整精米率是相互矛盾的指标 ,普遍认为垩白大的米样 ,整精米率较低 ;而垩白小的米样 ,整精米率较高。在实践中 ,有些米样实际垩白较大 ,在碾米过程中米粒易断裂 ,因而整精米率较低。但是 ,由于测量垩白时取整精米作样品 ,丢掉了垩白较大但已断裂了的米粒 ,人为地降低了样品的垩白米率 ,造成了一种部分样品整精米率低且垩白米率低、垩白度小的假象 ,尤其是对垩白与整精米率的矛盾非常尖锐的样品而言 ,不能反映真实情况。笔者认为 ,对一些特殊的样品应采取手工剥壳测量垩白的方法。2 …     

机器视觉在稻米整精米率快速计算中的应用

将机器视觉技术以及图像处理方法应用于稻米整精米率计算,通过图像预处理仅保留图像中大米的轮廓信息,并采用闭合图形边缘搜索方法提取大米轮廓像素点。由于米粒形似椭圆,并以长轴为对称轴来实现米粒长度的快速计算。实验结果表明,该算法检测与人工检测相关系数为0．96,可用于整精米率的快速检测。     

基于大米外观品质分析系统对垩白米的快速测定

采用自制开发的一种大米外观品质分析系统,包含整列装置、背景板、扫描设备和计算机,结合图像处理技术,对垩白米进行快速准确的识别测定。以国家标准方法对垩白米的检测为基础,优化分析系统识别检测垩白米时的最佳阈值,再应用于实际大米样品中垩白米的测定。结果表明,分析系统检测一幅大米图像平均用时为5 s,通过实验优化分析系统测定大米样品垩白特征参数的最佳阈值为0.43,在此阈值下大米外观品质分析系统与人工法测定垩白米数量绝对误差大小不超过2颗,垩白粒率绝对误差大小不超过0.32%,垩白度绝对误差大小不超过0.25%,表明可用大米外观品质分析系统代替人工法对垩白米进行检测。     

基于多尺度特征融合注意力机制的纸病分类方法研究

针对造纸工业中传统纸病分类算法准确率低的问题,本课题提出一种多尺度图像增强结合注意力机制的方法;采用锐化滤波器和对比度增强操作获得图像对直线信息的响应,同时利用Sobel边缘检测获取图像对边缘信息的响应,然后将这些响应分别放进卷积神经网络(CNN)中提取浅层局部信息后进行特征融合,得到全局信息,最后利用注意力机制,通过关注这些图像中最有特点的部分,进行纸病分类。实验表明,该方法优于HOG+SVM、LBP+SVM以及传统CNN等方法,在自建数据集上,分类准确率可达到96.63%;与现有基于CNN的纸病分类算法相比,所需的数据量更少,分类效果更好。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press