admin

同城: 未知

在印刷向多色、高效发展的今天，人们对印品质量和印刷效率有了更高的要求，而提高印品质量和印刷效率的有效途径之一就是印品检测。现今的印刷工艺，多数是利用调幅网点作为印刷图像成像的最基本单元，所以控制网点变化是控制印品质量的关键。 检测印品质量的方法有很多，其中较常用的是对网点面积率的检测。目前用于印品质量检测较常用的方法是控制条检测，但该方法的缺点是无法知晓各单色网点的油墨供给量和网点大小变化等情况，不能全面真实地反映整个印品的质量特征，不能全方位地实施质量监控，有时人眼的鉴别会因图像的复杂性和套色的多少而产生顾此失彼的现象。为了提高印刷的控制精度，海德堡．曼罗兰公司采用了直接检测印刷图像的先进技术。印品检测的自动化是未来的发展趋势，而将数字图像处理技术应用于印品质量检测无疑是一个新的发展方向。 数字图像处理技术及其重要性 图像处理就是用一系列的特定操作来改变图像的像素，以达到特定的目标，如使图像更清晰，从图像中提取某些特定的信息等。数字图像处理是现代图像处理的主要方法，具有再现性好、精度高、适用面广和灵活性大等优点。数字图像处理的内容非常丰富，从功能上讲可以将其划分为三大类：像质改善、图像分析和图像重建。而对印刷图像的处理主要为图像分析，而在工业自动化。在线产品检验、生产过程控制等实际工业领域内，主要应用的基础技术为图像分割，其是图像分析的一种非常重要的技术，也是印品图像处理的主要方法。 在对图像的研究和应用过程中，人们往往仅对图像中的某些部分感兴趣，其一般对应着图像中某些特定的，具有独特性质的区域。为了辨识和分析图像中的目标，需要将其从图像中分离出来，在此基础上才有可能进一步利用图像，对目标进行测量。图像分割是指将图像分成各具特性的区域并提取出目标的技术和过程，其在不同的应用领域中有着不同的称谓，是图像处理过程中的主要环节，同时也是一个难题。事实上，虽然对图像分割的研究已有几十年的历史，并取得了相当的进展和成果，也提出了如边缘检测。区域分裂、神经网络、模式识别等算法，但由于应用的领域不同、图像的质量不同，目前还没有一种完全通用的方法，也没有一套完整且客观的评价体系。 近年来，随着多媒体技术的飞速发展，彩色图像的提取和应用越来越广泛，彩色图像的处理也变得越来越重要。与灰度图相比，彩色图像包含的信息要多得多，不仅包括亮度，还有色调，饱和度等图像信息。 对彩色图像进行处理时，首先要选择合适的色彩特性空间，彩色图像中所包含的各种色彩信息能够很好地表征图像中各部分的特点，任何图像处理方法都可以通过图像中色彩信息的色彩特征来实现。通常，彩色图像中每个像素值均由三原色R、G、B给出，但这三种颜色之间有较大的相关性，不能很好地表现出物体的特征，直接利用这些变量常常不能得到所需的效果。为了降低色彩特征空间中各特征分量之间的相关性，人们通过线性和非线性变换将图像由RGB空间转换到其他与设备无关的色空间中，如YUV、YIQ、Lab、LCH等，具体利用哪一种空间或空间的组合要根据实际情况来调整。 另外，处理图像要有适合的策略和方法，这对处理效果有着很大的影响。实际应用中，要根据色彩空间，选择适合该空间的处理方法，才能得到满意的效果。(来源:4a98.com) 数字图像处理在印品检测中的应用 印刷过程中，许多因素影响着印品的最终质量，而直接反映到印品上就是各色网点及网点供墨量的变化。在图像中最小的成像单元是像素，通过日、G。B三原色值来表现图像内容，而印刷图像中最小的成像单元是网点，通过网点油墨的叠印来再现图像内容，网点的大小和形状直接影响印品质量。实际印刷中，人们通常观察并计算出印刷图像的网点面积率以及供墨情况，将其与样张进行比较来分析印品质量，并据此调整油墨量等，以改善印刷效果。但人们常用的方法仍是人工的、依赖性较大的，即便是同一印版，不同墨区的网点变化情况和网点油墨供给量也不相同。如果利用采集设备直接对印品图像进行图像数据采集，并将采集到的数字图像进行相应处理，进一步获得各单色油墨网点的质量指标，就可以基本上了解整个图像的质量数据，进一步提高印品质量，这也是印品自动化检测的基本思想。如何从彩色印刷图像中分离出各单色油墨的网点图像，进而得到单色油墨网点图像的网点面积率及质量指标．是实现印品自动化检测的关键所在。 彩色印刷图像是由C、M、Y、K四色油墨叠印而成，主要是利用色料减色法来呈现色彩。C、M、Y、K四色可以组成16种基本色元，将这些色元作为色彩母体．把印刷图像中每个像素的色彩特征值与母体的色彩特征值进行比较，根据距离最小颜色相似性测度原则，从而把该像素归类，统计各色彩母体所包含的像素个数及其所在原图像中的位置，即可得到网点图像的颜色划分，进而得到各单色的网点图像。 运用数字图像处理技术对得到的彩色印刷图像进行处理，从四色叠印的图像中将C、M、Y、K四色值分解出来，并将其复制到空白的图像中，以得到四色版网点图像，并在各色版上分别进行图像处理，便可得到各色版的网点面积率．网点形状系数、网点位置等多种参数。将这些信息值与标准值进行比较，便可分析得到当前印品存在的问题，如色差情况、是否有脏点、套印是否准确等。然后由计算机进行相应的调整并正确地反馈出来或进行报警，从而可以提高印刷控制的精度，减少废品率，降低人为操作带来的负面影响。在实验研究中，这些数据具有很高的研究价值，对深入研究彩色网点呈色原理、研究油墨叠印规律等具有重要的理论价值。 未来应用展望 在实际印刷中，由于印刷中水。墨的影响造成图像边缘模糊，采集设备受多种情况的影响使输入图像不清楚等，都会降低最终分色的准确性，从而影响处理结果。但利用数字图像处理技术对印品进行检测和监控还是有着非常大的发展空间，随着图像处理技术的不断发展和越来越多研究者的涉入，其在印品检测环节的作用会越来越大。 市场的需求推动了印品质量检测的产生和发展，力求实现自动化是提高印品质量和印刷效率的保障，而数字图像处理技术则为印品质量检测与控制开辟了一条新路。

shoesmall01

同城: 未知

We are UGG Boots Air Jordan GHD online store,offer all kinds of latest fashion Uggs Classic Tall,Ugg Bailey Button,Air Jordan online store,Nike Air Jordan,MLB Jerseys,Cheap NFL Jerseys, Cheap NHL Jerseys, NBA Jerseys,Cheap cartier glasses,GHD, New styles and hot styles are active every day.We wholesale our products at very low price but with high quality.Our products are always very hot in UK, Canada,, USA, Australia, etc., Many wholesalers, retailers, shop owner, online store owner, byers buy and resell our products.We welcome buyers from all over the world. Let's do business bit by bit and become our old customers.Ugg Boots more information uggonsale.org

clibin009

同城: 未知

The Fascists pandora charms were hermes belt firing, longchamp bags our ugg outlet people behind michael kors were air max firing, and michael kors outlet I was very jordan shoes conscious of air max being in cheap oakley the coach outlet middle. I uggs on sale felt rolex replica the blast moncler jackets of oakley sunglasses outlet a shot and montre femme realized that canada goose a iphone case man uggs outlet was oakley sunglasses firing rolex watch from louis vuitton handbags immediately ralph lauren outlet behind burberry me. moncler I the north face stood oakley pas cher up barbour outlet and vanessa bruno shouted canada goose at him:


'Don't air jordan shoot new balance shoes at me, hollister pas cher you bloody oakley sunglasses cheap fool!' kate spade handbags At this north face moment marc jacobs handbags I saw barbour jackets uk that Benjamin, moncler ten gucci bags or fifteen yards to thomas sabo uk my right, uggs was nfl jerseys motioning to true religion jeans me ralph lauren with his moncler arm. I ran michael kors outlet online across nike free to wedding dresses uk him. It meant moncler outlet crossing hogan the line nike trainers uk of sac guess spouting nike tn pas cher loop-holes, and moncler sito ufficiale as I cheap oakley sunglasses went juicy couture outlet I clapped nike air max my thomas sabo left replica rolex hand over lululemon outlet my cheek; an nike air max idiotic gesture--as though nike air max uk one's hand michael kors canada could nike roshe uk stop lancel pas cher a nike free pas cher bullet!--but canada goose pas cher I canada goose had ghd a roshe run pas cher horror of being lancel hit north face outlet in lululemon the beats by dre face. north face uk Benjamin north face outlet online was kneeling polo lacoste pas cher on one cheap oakley sunglasses knee air force with christian louboutin uk a hollister pleased, michael kors outlet online sale devilish sort michael kors outlet of michael kors expression on jordan 11 his face longchamp pliage and polo outlet firing carefully moncler at north face outlet the links of london uk rifle-flashes with links of london his automatic pistol. uggs on sale Jorge ghd hair had dropped wounded at lululemon outlet the ugg australia first moncler volley nike blazer and was gucci handbags somewhere louboutin shoes out nike trainers of sight. ralph lauren uk I knelt beside Benjamin, herve leger pulled replica watches the canada goose outlet pin polo ralph lauren outlet out of reebok shoes my nike outlet store third tiffany jewelry bomb louis vuitton bags and flung kate spade it. true religion Ah! ray ban sunglasses No celine handbags doubt louis vuitton about it that cheap oakley time. ugg pas cher The ray ban bomb christian louboutin outlet crashed inside nike factory outlet the ralph lauren outlet parapet, true religion outlet at the corner, vans just oakley sunglasses cheap by ray ban the machine-gun nest.


The louboutin Fascist fire hogan sito ufficiale seemed air max 2015 to have slackened very mont blanc suddenly. Benjamin prada outlet leapt to burberry his abercrombie and fitch feet cheap gucci and jordans for sale shouted: longchamp outlet 'Forward! Charge!' We hollister dashed juicy couture up the ferragamo belts short steep bottes ugg slope scarpe hogan on louis vuitton purses which the parapet stood. tn pas cher I nike free say 'dashed'; true religion jeans 'lumbered' longchamp uk would be nike free run a prada handbags better word; nike free run the longchamp pas cher fact is michaelkors-outlet-store.us.com that moncler outlet you ugg can't move nike air max pas cher fast when hollister clothing you michael kors handbags clearance are canada goose jackets sodden and gucci outlet online mudded from head nike air max to michael kors foot and weighted longchamp soldes down ugg soldes with a polo ralph lauren pas cher heavy rolex replica watches rifle jordan future and oakley vault bayonet air max and a nike factory hundred mcm handbags and swarovski crystal fifty cartridges. christian louboutin I burberry pas cher took it fake rolex for coach outlet store online granted louis vuitton canada that there polo ralph lauren would coach handbags be abercrombie and fitch a polo ralph lauren Fascist waiting ugg outlet for me at tory burch outlet online the nike air huarache top. hermes handbags If hermes he ralph lauren fired cheap jordans at oakley sunglasses wholesale that range coach factory outlet he nike free run could cheap ugg boots not polo ralph lauren outlet miss longchamp bags me, north face jackets and insanity workout yet somehow michael jordan shoes I oakley sunglasses cheap never burberry outlet expected michael kors handbags him michael kors outlet online to fire, only kate spade outlet to air jordan retro try for air huarache me with his pandora charms bayonet. hollister uk I ralph lauren polo seemed louboutin to uggs on sale feel in bottega veneta advance louis vuitton the sensation canada goose jackets of our swarovski bayonets converse shoes crossing, wedding dresses and timberland pas cher I retro jordans wondered whether chaussures louboutin his uggs outlet arm would louis vuitton outlet be birkin bag stronger michael kors handbags than longchamp outlet online mine. timberland However, oakley outlet there sac burberry was michael kors purses no Fascist michael kors handbags waiting. nike outlet With prada shoes a michael kors handbags vague canada goose outlet feeling of sac lancel relief polo ralph lauren uk I found nike roshe run that uggs outlet it was a low michael kors outlet canada parapet toms outlet and instyler the canada goose jackets sand-bags gave a good foothold. north face outlet As new balance a sac louis vuitton rule canada goose they ugg boots are jordan retro difficult fake oakleys to oakley vault get michael kors uk over. converse Everything louis vuitton outlet online inside was soccer jerseys smashed babyliss pro to longchamp outlet online pieces, p90x beams asics shoes flung barbour all true religion jeans over true religion outlet the ugg boots place, and great ugg boots shards moncler uk of rolex watches uralite littered uggs canada everywhere. michaelkors-outlet-store Our oakley sale bombs sac hermes had louis vuitton uk wrecked louboutin uk all the nike free run uk huts nike store and hollister clothing store dug-outs. burberry handbags And louis vuitton pas cher still there nike roshe run was nike air max uk not a soul visible. coach outlet I replica handbags thought michael kors they louboutin would nike huarache be air max lurking air jordan somewhere longchamp bags underground, and ugg soldes shouted pandora uk in English true religion outlet (I vans scarpe could hollister not burberry factory outlet think kate spade outlet online of any ray ban sunglasses Spanish at moncler jackets the hermes bags moment): wedding dress 'Come louis vuitton outlet on vans out hermes birkin of cheap ugg boots outlet it! louis vuitton Surrender!' No answer. supra shoes Then uggs outlet a louis vuitton man, ralph lauren outlet a cheap nfl jerseys shadowy mulberry uk figure in the half-light, iphone cases skipped louis vuitton over louis vuitton outlet the tory burch outlet roof michael kors outlet online sale of babyliss one of ugg italia the ruined mont blanc pens huts and dashed uggs outlet away canada goose uk to lululemon outlet canada the nike sneakers left. I barbour jackets started coach outlet store online after him, nike huaraches prodding jordan retro 11 my beats headphones bayonet ineffectually into the coach purses darkness. burberry outlet As I barbour jackets rounded nike air max the comer lululemon of the longchamp hut ugg boots clearance I vans outlet saw uggs a new balance man--I don't converse know longchamp whether or michael kors outlet online sale not hogan outlet it longchamp handbags was guess pas cher the same mac cosmetics man as doudoune moncler I longchamp handbags had seen before--fleeing ugg boots clearance up nike roshe the communication-trench canada goose outlet that led to http://www.michaelkors-outlet-store.us.com/ the jordan 3 other ghd straighteners Fascist position. oakley store I moncler outlet must nike air max have been very ugg boots close louboutin to gucci belts him, new balance pas cher for north face jackets I could see mulberry bags him clearly. abercrombie He gucci outlet was louboutin pas cher bareheaded ralph lauren outlet online and jordan xx9 seemed vans pas cher to vans shoes have michael kors nothing oakley sunglasses on except jimmy choo shoes a longchamp pas cher blanket hollister which christian louboutin he was lunette ray ban pas cher clutching cheap sunglasses round coach outlet his oakleysunglasses1.us.com shoulders. p90x3 If burberry I jimmy choo outlet had jordans fired coach outlet I marc jacobs could michael kors outlet online have nike tn blown nike air max him to ugg outlet pieces. ghd hair straighteners But mulberry for fear abercrombie and fitch of air jordans shooting instyler ionic styler one another we moncler pas cher had been ordered burberry outlet online to michael kors use pandora jewelry only canada goose outlet bayonets nike shoes once michael kors we jordan 1 were burberry outlet online inside the lunette oakley pas cher parapet, and in any ray ban case air jordan shoes I michael kors pas cher never michael kors outlet even reebok outlet thought air jordan pas cher of polo ralph lauren outlet firing. Instead, my uggs mind wedding dresses leapt ugg backwards nike roshe run twenty ray ban uk years, ray ban sunglasses to canada goose our swarovski uk boxing instructor at cheap nike shoes school, showing louboutin outlet me in chi flat iron vivid jordan 12 pantomime sac longchamp how he giuseppe zanotti had bayoneted a hollister Turk louis vuitton at sunglasses outlet the tiffany and co Dardanelles. nike roshe run uk I timberland boots gripped my rifle gucci by the louboutin small of nike air max 2015 the butt ray ban outlet and lunged sac longchamp pas cher at the man's ugg pas cher back. ugg boots He michael kors was just out ugg boots of nike air force my north face jackets reach. Another lunge: nike blazer pas cher still michael kors outlet out tiffany jewelry of michael kors reach. And for asics running shoes a doudoune canada goose little bottes ugg pas cher distance bottes ugg pas cher we nike air max proceeded like louboutin outlet this, he rushing up chanel handbags the longchamp trench and red bottom shoes I replica watches after coach factory him on sac louis vuitton pas cher the polo ralph lauren ground ugg above, air max 2015 prodding at michael kors bags his uggs shoulder-blades and christian louboutin outlet never michael kors outlet online sale quite jimmy choo getting there--a lululemon outlet online comic memory valentino shoes for me toms shoes to moncler look rolex watches back montre pas cher upon, though I suppose hermes pas cher it karen millen uk seemed air jordan 11 less comic nike free run pas cher to him.


Of nike roshe course, north face he rolex watches for sale knew air max pas cher the ugg uk ground christian louboutin shoes better mulberry outlet than www.michaelkors-outlet-store.us.com I and uggs had soon tory burch slipped air max away oakley glasses from me. soccer shoes When I came back louis vuitton outlet the true religion outlet position celine bags was jordan 4 full louis vuitton of louis vuitton outlet online shouting men. abercrombie The replica watches uk noise ray ban sunglasses of moncler firing had the north face lessened michael kors outlet online somewhat. The Fascists christian louboutin shoes were nike free still michael kors outlet online pouring hollister canada a michael kors outlet heavy christian louboutin fire at us hollister from lululemon canada three michael kors outlet sides, abercrombie but polo ralph lauren it air max was longchamp outlet coming oakley sunglasses from a moncler greater michael kors outlet distance.


We polo lacoste had driven ugg them abercrombie back true religion jeans for the phone cases time being. I longchamp remember longchamp outlet saying ugg boots clearance in mulberry handbags an oracular sac louis vuitton manner: michael kors canada 'We cheap oakley sunglasses can michael kors bags hold michael kors outlet this tiffany and co place for half michael kors outlet online an gucci shoes hour, polo ralph lauren outlet online not more.' canada goose I oakley vault don't know uggs why swarovski jewelry I picked karen millen on ugg boots uk half oakley an moncler jackets hour. Looking nike roshe over replica watches the coach outlet online right-hand parapet jordan 6 you could ray ban sunglasses outlet see jerseys innumerable p90x workout greenish rifle-flashes stabbing the vanessa bruno pas cher darkness; louboutin shoes but they oakley were louis vuitton a long way coach outlet store back, longchamp outlet online a moncler outlet hundred or discount oakley sunglasses two new balance outlet hundred canada goose jackets yards. barbour Our coach bags job uggs now was oakley sunglasses to search the louis vuitton handbags position nike air max 2015 and christian louboutin loot anything that cheap oakley sunglasses was worth sac vanessa bruno looting. ray ban pas cher Benjamin new jordans and michael kors outlet online some nike free uk others were already jordan 5 scrabbling north face pas cher among the ugg ruins air max of a baseball bats big canada goose outlet hut or pandora jewelry dug-out oakley vault in the lacoste pas cher middle nike roshe run pas cher of ralph lauren pas cher the ferragamo shoes position. barbour uk Benjamin montre homme staggered louboutin excitedly ralph lauren through cheap uggs the ruined jordan pas cher roof, converse pas cher tugging burberry sale at longchamp the rope abercrombie and fitch uk handle louis vuitton outlet stores of an sac michael kors ammunition abercrombie box.

bottes ugg