图像处理工具箱-英.ppt

MatlabwithDIP教学 TheMATLABImageProcessingToolbox TheImageProcessingToolboxisacollectionofMATLABfunctions calledM functionsorM files thatextendthecapabilityoftheMATLABenvironmentforthesolutionofdigitalimageprocessingproblems TheMATLABImageProcessingToolbox cont Including Spatialimagetransformations Morphologicaloperations Neighborhoodandblockoperations Linearfilteringandfilterdesign Transforms Imageanalysisandenhancement Imageregistration Deblurring Regionofinterestoperations HowdoIknowM function FinditinMatlabHelp bycategory byalphabeticalorder Finditonthetextbook Matlab内建图像 C MATLAB7 toolbox images imdemos皆为MatlabHelp中范例的原始图像 使用时只需直接在指令中输入文件名 即可使用 适用于观察影像处理结果 DifferentImageTypes IndexedimagesIntensity grayscale imagesBinaryimagesRGB true color images Readinganimage imread 功用 将图像加载并存成array格式备用用法 I map imread filename I imread filename ex I imread pout tif I为指向影像的变量不指定变数 则为ans Displayinganimage imshow 功用 开启一个窗口显示影像用法 imshow I imshow I map Figure imshow 功用 开启一个新窗口显示影像用法 figure imshow I Displayinganimage cont imshow I low high imshow I 功用 displaysIasagrayscaleintensityimage specifyingthedatarangeforI TheminimumvalueinIisdisplayedasblack andthemaximumvalueisdisplayedaswhite Displayinganimage cont Spatialdomain Displayinganimage cont pixval 功能 cursoronimagetoshowpixelvalues用法 imshow I pixval Displayinganimage cont colorbar功能 Todisplayanimagewithacolorbarthatindicatestherangeofintensityvalues 用法 imshow I colorbarex I imread pout tif imshow I colorbar Writinganimage imwrite 功能 将影像写入成档案用法 imwrite I filename format ex imwrite I pout jpg JPEG Imageinformation Imagesize size ex I imread saturn png size I M N size I M 影像I的高N 影像I的宽 Imageinformation whos功用 displayinformationaboutanimage ex whosIImfinfo filename 功用 displayinformationaboutimagefile ex info imfinfo saturn png DigitalImageprocessing 图像二值化g im2bw I T 功用 ConvertintensityimageItobinaryimagegusingthresholdT whereTmustbeinrange 0 1 ex I imread pout tif g im2bw I 0 4 imshow g colorbar DigitalImageprocessing cont 彩色转灰阶Rgb2gray 功用 将RBG彩色影像转换成gray level影像 ex I imread saturn png g rgb2gray I imshow g colorbar DigitalImageprocessing cont 反相imcomplement 功用 Thenegativeofanimage ex J imcomplement g imshow J DigitalImageprocessing cont 变更影像大小imresize I scale method 功用 Tochangethesizeofanimage interpolationMethod nearest Nearest neighborinterpolation bilinear Bilinear thedefault bicubic Bicubicinterpolation DigitalImageprocessing cont ex I imread circuit tif J imresize I 1 25 imshow I figure imshow J ex I imread circuit tif J imresize I 100150 bilinear imshow I figure imshow J DigitalImageprocessing cont 旋转影像imrotate I angle 功用 Torotateanimage ex I imread pout tif J imrotate I 35 imshow J MoreExample Usingaffinetransformation1 Rotation45degreeI imread cameraman tif T maketform affine cosd 45 sind 45 0 sind 45 cosd 45 0 001 tformfwd 1020 T I2 imtransform I T imshow I2 MoreExample cont 2 TranslationI imread cameraman tif se translate strel 1 2525 J imdilate I se imshow I title Original figure imshow J title Translated MoreExample cont 3 shearI imread cameraman tif T maketform affine 100 120 001 tformfwd 1020 T I2 imtransform I T imshow I2 MoreExample cont Edgedetectors1 SobeledgedetectorCode BothhorizontalandverticalI imread cameraman tif BW2 edge I sobel 0 02 both figure imshow BW2 MoreExample cont 2 theCannymethodlowthreshold 0 04 highthreshold 0 10 sigmais1Code I imread cameraman tif BW4 edge I canny 0 040 10 1 figure imshow BW4 MoreExample cont Canny以C语言来实作会困难很多 MoreExample cont Filter meanfilter Code I imread coins png h ones 5 5 25 I2 imfilter I h imshow I title OriginalImage figure imshow I2 title FilteredImage MoreExample cont Filter unsharpmaskingfilter Code I imread cameraman tif h fspecial unsharp I2 imfilter I h imshow I title OriginalImage figure imshow I2 title FilteredImage M function不够用怎么办 自己写 在网络上寻找高手的package 当找到新的M files时 需帮它设定路径 才可以像一般内建function直接使用 Setpath Setpath cont MATLABCompiler MATLABCompiler能让您将MATLAB程序转换为可单独执行的应用程序和软件组件 并分享给其它使用者 MATLABCompiler可免除您经由手动编写方式将MATLAB程序代码转译为C或C 的程序 要再安装MATLABComponentRun time MCR 组件等 MATLABCompiler cont CtoMatlab设定了合适的编译器 matlab会自动帮我们编译这个程序 Example helloworld指令 编译 mexfilenameex mexhello c 执行 filenameex hello MATLABCompiler cont hello c include include mex h voidmexFunction intnlhs mxArray plhs intnrhs constmxArray prhs printf Hello world mex h定义了所有Matlab和C沟通所用到的subroutine mexFunction是程序的进入点 等价于ANSIC的main 參考書籍 DigitalImageProcessingUsingMATLABbyRafaelC Gonzalez RichardE WoodsStevenL Eddins 3个Projects 电能表读数识别人脸检测印刷线路板缺陷检测 电能表读数识别 对字轮进行精确定位与识别 对条码进行精确定位与识别 MatlabPackage 模式识别包 PRTools http www prtools org SPRTool http www4 utsouthwestern edu wardlab index files SPRTool htmOCRMatlab例子 人脸检测 OpenCV库 印刷线路板缺陷检测 利用机器视觉 图像处理等技术 对印刷线路板上的诸如短路 断路 线距过窄过宽等各种缺陷进行自动检测 类比 数位化 Binary 图像获取 CCD 类比 EIC 类比转数位资料线路A D 数位化 Graylevel 图象处理卡 数位转换二进位资料线路 二进位图象 0或1 Pixels 铜箔 基材 CurrentScanline 检测缺点方式 设计规范 DRC 检查 标准母板 REF 比较法 1 GoldenBoard 以量产板择一当作标准板 记录板上所有Feature位置 检测时与其它电路板比对藉以发现短断路之缺点 优点 Feat