Emgu CV is a library of wrapper function for calling OpenCV functions from Visual Studio Windows Forms. Let’s look at the steps. Download Emgu CV from I’ll be using the latest version 2.4.10. After the download then you can install it to a prefered location for example C: emgu 2. Setting Emgu CV path to System Environment Path Now you must.

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1. It's probably already installed on your development machine but not on test machines. Also, you may need 32-bit version even if all your code is AnyCPU running on a 64-bit OS. EMGU CV Licence. Please read the Emgu Cv Licence They have a dual licence system for Open Source vs Commercial Closed Source.
2. 2016-02-06 Emgu.CV-3.1.0 final release is available in sourceforge. This version added 64 bit Android (x8664, arm64v8) support for Xamarin. See change log and known issues. 2015-07-12 Emgu.CV-3.0.0 final release is available in sourceforge. This is the first stable release based on Open CV 3.0 final. See change log and known issues.

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• 10A Little More Image Processing
• 11The DllNotFound Exception and Troubleshooting 0x8007007E
• 13History

X64 Architecture

X86 Architecture

Introduction

The following article is designed to show new comers to EMGUcv how to set up a project step by step. This article is designed to make the process a little more user friendly. EMGU is a c# wrapper for OpenCV it differs from other wrappers as it written purely in c# and does not use unsafe code. EMGU opens the OpenCV (Open Source Computer Vision Library) library of programming functions mainly aimed at real time computer vision to C# developers. OpenCV was originally developed by Intel and now supported by Willow Garage.

Current versions for both x86 and x64 architectures are available to download at their Sourceforge website.

As EMGU is a wrapper for c++ code there are two types of Dynamic-link library’s (DLL’s) that are used. There are the EMGU ones with EMGU syntax always reference in the name and the opencv ones that vary. Setting up a first project is a common stumbling block for many newcomers and you are not alone.

If you have downloaded the source code you will need to read “A Basic Program”. If you have copied an example from the EMGU extraction folder then take a look at The EMGU.CV.Invoke Exception and Troubleshooting section.

Assumed Knowledge

It is assumed that a user has basic experience in c# and can generate a new c# project. It is assumed that each user has download the most recent update for their platform and has the HelloWorld Example running from the EMGU extraction folderEMGU.ExamplesHello World.

The Basic Requirements

As with any c# library there are some essential DLL’s that need referencing within your project. Start a new c# Windows Form Application and call it what you like. All DLL mentioned are in the EMGU extraction Folderbin you will need to remember this. To start with you need to reference 3 EMGU DLL’s.

• Emgu.CV.dll
• Emgu.CV.UI.dll
• Emgu.Util.dll

This is done by either right clicking on your project name or the References folder within the solution explorer. Go to Add Reference.

Or alternatively using the menu item Project > Add Reference. When the Add Reference window opens select the DLL’s listed above and click OK.

You will now see them listed in the References folder in the solution explorer window. These three DLL’s are the EMGU specific c# libraries mentioned previously. These alone will not allow you to use any of the image processing functions so please read the rest of the article.

Now you need to reference these in any class of form that you will be using the code. The references you will use will depend on what you are doing in image processing terms. Look at the examples and these will have the ones your require. To get you started add the following to the top of the Form1.cs code behind.

The Preferred Method

Now for the more complicated c++ libraries, to load, display, access image data and do many of the more simpler functions you only need two files. Note that the '220' is the version number this will change according to updates (opencv_core***.dll, opencv_imgproc***.dll).

• opencv_core220.dll
• opencv_imgproc220.dll

Now because these are wrapped c++ files you can’t reference them like you did with the EMGU files. You need to add these files to your project. This can be done in two ways, Right click on your project name within solution explorer (This is not the one starting with “Solution ‘Your Project Name’ .” but the one bellow this). Go to Add > Existing Item using the standard open file dialog. Select the two files above, in case you forgot they are located in the EMGU extraction Folderbin.

Hint: if you can’t see .dll's make sure you change the file filter at the bottom right to Executable Files.

You will now be able to see your files within the solution explorer window. You will need to change there properties so select them both by holding down the Ctl key and left clicking on them (alternatively you can do this individually). Now look at Properties window, you will see 6 fields two of these will be filled with content. You are interested in the Copy to Output Directory. Change this from “Do not Copy” to “Copy always”.

If you are using the x64 compilations go to the x64 section and ensure you set up you project to compile to a x64 architecture other than that you are ready to start image processing. The reason this is the preferred method is that now, if you change from Debug to Release these files will always be available to your program and no errors will occur. Jump to the reading and displaying an image section A Basic Program to start you off.

The Less Preferred Method

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While not proffered this is often the simplest and if you have a complex project architecture this can prevent the solution explorer from looking very messy. Simply navigate in windows explorer to the EMGU extraction folderbin copy the relevant dll files opencv_core220.dll and opencv_imgproc220.dll to your project binDebug folder or to binRelease folder. This will change with x64 versions as it will be the binx64Debug folder or alternative Release folder.

While the benefits are not so clear here, imagine if you require all the opencv DLL files then you will have an extra 34 files within the solution explorer however, it is rare this will be the case.

x64 Architecture and the EMGU.CV.Invoke Exception

If you are running an x64 system or designing for them you will have to download separate DLL’s. The steps on forming a project are identical however you will need to change an additional build parameter. Right click on your project file in the solution explorer and select “Properties” at the bottom. Select the “Build” tab from the ribbon bar on the right of this window. There will be an option for Platform Target: with a drop down menu change this from x86 to x64.

Hint: If you are using the express version of visual studio you may not see the x64 option in such a case go to menu option Tools > Options. In this window using the arrows to the left hand side to expand and collapse options. Select “Projects and Solutions” and select the Show advanced build configurations check box.

This will now allow the compilation to run if this is not done correctly. As soon as you access any EMGU code an exception will be thrown ‘EMGU.CV.Invoke’ through an exception with the ‘InnerException’ 'An attempt was made to load a program with an incorrect format.”.

A Basic Program

To get you started a simple program that loads an image and displays it in a picture box has been provided and a little bit more of an advanced one that will show how to access image data and convert between image types.

Only x64 Versions are currently available, x86 will be provided shortly.

My harmony software download mac. If you have downloaded the sample code you will start with 3 warnings for the references not being found. Expand the References folder within the solution explorer delete the 3 with yellow warning icons and Add fresh references to them, the steps of which are available The Basic Requirements section.

There has been a button item and a picturebox item added to the main form. There default names have not been changed. When we click on the button we wish to open a file dialog select and image and have it displayed in the picturebox.

Double click on the button and add the following code:

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The code is very simple an OpenFileDialog called 'Openfile' is used to select and image file. This image is then read into an colour Image object called 'My_Image'. The image is displayed by assigning the Image property of the picturebox. This requires a Bitmap and by calling the .ToBitmap() function of 'My_Image' this is achieved.

This is incredibly simple to achieve once the correct process has been taken in setting up the project. An alternative to the Picturbox item is made available through the EMGU.CV.UI library and is used in the examples. Please visit http://www.emgu.com/wiki/index.php/Add_ImageBox_Control to learn how to add this control to visual studio should you wish to use it.

A Little More Image Processing

The slightly more advanced source code project will have the same warnings as described in A Basic Program has been provided. The references will need replacing. In this program there is a demonstration of converting an Image from colour to greyscale and accessing the Data of individual pixels. While the methods of suppressing the image spectrum data is not the most efficient it is a good example on accessing the image Data property.

A little on Converting Images

Image conversion in EMGU can be complex. In the example program a Bgr colour image is converted the Gray or grayscale.

However you will eventually want to use a different depth (Tdepth) of image rather than Byte. The problem with this method is you can only convert a depth or colour once per call. Lets say we wish to convert from Image<bgr,byte> to Image<gray,double> you would have to use the following syntax.

Accesing Image Data

There are a few ways of accessing image data and assigning values to it. There are two methods available, direct access using the Image Data property of a more remote access. Both are demonstrated here. Note it is important to respect the image spectrum depth when accessing the Data property. A grayscale image will have a depth of one so will be reference as [x,y,0] however a colour image as a depth of 3, [x,y,0], [x,y,1] & [x,y,2] representing the Blue, Green & Red spectrums respectively (Bgr).

Lets say we wish to assign a value to a pixel at position [0,0] a value. Using the easier remote method we can use:

Or we use the Data property

So writing to a pixel is fairly simple but what about reading a pixel value.

Now in many cases you will not want to work with “Bgr” or “Gray” so converting them is important.

You will notice that each value is cast to an integer to allow data loss this is because the intensities are stored naturally as doubles. However in this case the easier method is accessing the Image Data property. If you wish to work with the image data there is not a requirement to constantly convert between Gray and integers etc. You can access the image Data directly and use that.

Much simpler and far easier to work with when processing the image Data within a loop. To examine how to implement a loop please download the Little More Image Processing source code.

The DllNotFound Exception and Troubleshooting 0x8007007E

Now at some point you are going to receive and error 'Unable to load DLL.. (Exception from HRESULT: 0x8007007E)”. You need to read the Message section circled in red bellow.

If the exception is a EMGU.CV.Invoke Exception, chances are you are not targeting the correct platform for your build. See the section regarding x64 Architecture for details.

Now if you’ve progressed through to an advanced image processing method or simply have copied an example to an alternative location than the EMGU extraction folder you will possibly be seeing one of the following errors. Frog leap game free download.

Unable to load DLL 'opencv_highgui220': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Usually caused when you are trying to get a image from a web camera. The solution to this is extremely simple. As discussed in The Basic Requirements section you will need to either copy the opencv_highgui220.dll to the output directory or the more preferred method of adding the file to your project as an existing file and then changing its property “Copy to Output Directory” to “Copy always”. Look back at this section for reference if required.

Unable to load DLL 'cvextern': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

This error has a little more of a substantial solution. The cvextern.dll error can not be fixed by simply adding the this one file in fact this file requires all of the files listed bellow to correctly execute. As discussed in The Basic Requirements section you will need to either copy files to the output directory or the more preferred method of adding the files to your project as an existing file and then changing each of their properties “Copy to Output Directory” to “Copy always”. Look back at this section for reference if required.

Note that the '220' is the version number this will change according to updates.

• cudart64_32_16.dll
• cufft64_32_16.dll
• cvextern.dll
• npp64_32_16.dll
• opencv_calib3d220.dll
• opencv_contrib220.dll
• opencv_core220.dll
• opencv_features2d220.dll
• opencv_flann220.dll
• opencv_gpu220.dll
• opencv_highgui220.dll
• opencv_imgproc220.dll
• opencv_legacy220.dll
• opencv_ml220.dll
• opencv_objdetect220.dll
• opencv_video220.dll

Any other Unable to load DLL ‘.’ errors can be fixed by attempting the same process an loading the relevant listed DLLs into your project. If you still get stuck than feel free to ask the community for help.

System.TypeInitializationException: Convertion from Image<Emgu.CV.Structure.Bgr*,System.Byte*> to Image<Emgu.CV.Structure.Structure.Bgr*,System.Byte*> is not supported by OpenCV

Where * is the the relavent image depth or data type.

This error is thrown up in version 2.3.* onwards and is caused by the programs inability to access opencv_imgproc***.dll or opencv_core***.dll even though they are present in the output 'bin' directory.

There are two solutions, adding them to the project and set there properties to copy always as they are the two key files. Or by replacing the current ones in the Bin folder with new copies can also solve the problem.

If both methods fail then there may be a problem with the build so download a new copy from SourceForge and try again.

I hope this article sets you on the right path, Thanks for reading.

History

[1] The x64 Source code file links have been corectly linked.

[2] Added Some Notes about version number and DLL added x86 Versions and Updated x64

The old x64 Versions will have a problem when reading image data values as eventually they will be out of bounds especially with small images. To solve this the picturebox is set to Autosize and placed within a panel with autoscrole turned on.

[3] A new error has become apparent in version 2.3.* the solution has been added, thanks to Mikos for finding this problem.

Author

Christopher Johnson – Manchester Metropolitan University,

This article is the same I wrote on Codeproject [[1]], I thank them for hosting of the files, if requested they can be hosted via alternative sites. If there are any corrections you feel should be made feel free to contact me through the EMGU forum. Minor edits are welcome and all are moderated, feel free to contribute your software as well.