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drexel_darwin_opencv

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drexel_darwin_opencv [2016/11/06 04:48] – [Real Time Trial On Ladder(2)] dwallacedrexel_darwin_opencv [2016/11/06 19:20] (current) – dwallace
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 I will be using Visual Cpp 2010 Express as my platform for practicing OpenCV.  I will be using Visual Cpp 2010 Express as my platform for practicing OpenCV. 
  
-I refer to [[https://www.youtube.com/watch?v=2i2bt-YSlYQ|here]] for the installation of the relevant software application and [[http://www.18f4550.com/OpenCV_and_Emgu_CV/OpenCV_tut_1/OpenCV_tut_1.html|thid tutorial]], which is related to the previous, to practise and understand some of the codes from the OpenCV library.+I refer to [[https://www.youtube.com/watch?v=2i2bt-YSlYQ|here]] for the installation of the relevant software application and [[http://www.18f4550.com/OpenCV_and_Emgu_CV/OpenCV_tut_1/OpenCV_tut_1.html|this tutorial]], which is related to the previous, to practise and understand some of the codes from the OpenCV library.
  
 There were some error with using OpenCV2.1 and OpenCV2.2 in this case. There were some error with using OpenCV2.1 and OpenCV2.2 in this case.
-  * [[http://answers.opencv.org/question/2582/the-application-is-unable-to-start-correctly/|Here]] states that OpenCV2.1 do not work with VC++ 2010.+  * [[http://answers.opencv.org/question/2582/the-application-is-unable-to-start-correctly/|Here]] states that OpenCV2.1 do not work with VCpp 2010.
   * [[http://blog.qinyujie.net/2011/01/15/440/|Here]] states that there is a bug in OpenCV2.2 that is preventing webcams from working with this version of OpenCV. However, mine still does not work after fixing this bug.   * [[http://blog.qinyujie.net/2011/01/15/440/|Here]] states that there is a bug in OpenCV2.2 that is preventing webcams from working with this version of OpenCV. However, mine still does not work after fixing this bug.
  
-I have changed to use OpenCV2.4.3 instead. I followed the tutorial [[http://stackoverflow.com/questions/10901905/installing-opencv-2-4-3-in-visual-c-2010-express|here]] to install it properly with VC++ 2010. And I got the program code to run!+I have changed to use OpenCV2.4.3 instead. I followed the tutorial [[http://stackoverflow.com/questions/10901905/installing-opencv-2-4-3-in-visual-c-2010-express|here]] to install it properly with VCpp 2010. And I got the program code to run!
  
 {{dylanw:redBallTracking.jpg}}\\  {{dylanw:redBallTracking.jpg}}\\ 
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 I have also prepared a MS Power Point presentation for a step by step installation of OpenCV. I have also prepared a MS Power Point presentation for a step by step installation of OpenCV.
  
-{{dylanw:OpenCV_Tutorial.pptx}}\\ +{{dylanw:opencv_tutorial.pptx}}\\ 
  
 ==== Rectangle Recognition Code ==== ==== Rectangle Recognition Code ====
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 while(1){ while(1){
 cap >> original;  //constantly obtain new frame from camera cap >> original;  //constantly obtain new frame from camera
-</syntaxhighlight> +
-<syntaxhighlight lang="cpp">+
 Mat original, pyr, timg, gray;//declare Mat objects that can be used to store image datas Mat original, pyr, timg, gray;//declare Mat objects that can be used to store image datas
 ... ...
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 //using the kernel of default aperture size of 3 as defined by "Mat()" //using the kernel of default aperture size of 3 as defined by "Mat()"
 //at default start point specified by "Point(-1,-1)" //at default start point specified by "Point(-1,-1)"
-</syntaxhighlight> +
-<syntaxhighlight lang="cpp">+
 vector<vector<Point> > contours; vector<vector<Point> > contours;
 //declaration of a vector of a vector of X and Y points //declaration of a vector of a vector of X and Y points
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 //processed image is saved to contours //processed image is saved to contours
 //in the designated mode //in the designated mode
-</syntaxhighlight> +</code> 
-'''Note''': Input image to ''findContours'' function must be a single channel image. It need not be grayscale. +**Note***: Input image to **findContours** function must be a single channel image. It need not be grayscale. 
-<syntaxhighlight lang="cpp">+ 
 +<code c++>
 for( size_t i = 0; i < contours.size(); i++ ) for( size_t i = 0; i < contours.size(); i++ )
 { {
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 Here is a sample run of my code to filter out black rectangles and output the X and Y coordinates of the centers of the squares in the output MS-Prompt window. Here is a sample run of my code to filter out black rectangles and output the X and Y coordinates of the centers of the squares in the output MS-Prompt window.
  
-{{dylanw:squaresCoordinates.jpg}}\\ +{{dylanw:squarescoordinates.jpg}}\\ 
  
 Some food for thought: Some food for thought:
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 [[https://github.com/mr1789/darwindasl/blob/master/Ladder.cpp|Here]] is my code and here is a video of it. [[https://github.com/mr1789/darwindasl/blob/master/Ladder.cpp|Here]] is my code and here is a video of it.
  
-{{#ev:youtube|R0gCfSxRoOk}}\\ +{{youtube>R0gCfSxRoOk?large}}\\ 
  
 Video explanation: Video explanation:
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 However, as can be seen circled in red, when there is a smooth straight line, the points do not appear, and hence on the ladder rungs which has pretty smooth horizontal edge features, points are hard to come by and a rectangle is hard to detect.   However, as can be seen circled in red, when there is a smooth straight line, the points do not appear, and hence on the ladder rungs which has pretty smooth horizontal edge features, points are hard to come by and a rectangle is hard to detect.  
  
-{{dylanw:contourPointsLadder.jpg}}\\ +{{dylanw:contourpointsladder.jpg}}\\ 
  
 This means that one of the adjustments I made during my previous trial run, which was intended to smoothen the sides of the spaces in between ladder rungs by covering up the sides, should make the ladder rungs more difficult to be detected. However the opposite occur.  This means that one of the adjustments I made during my previous trial run, which was intended to smoothen the sides of the spaces in between ladder rungs by covering up the sides, should make the ladder rungs more difficult to be detected. However the opposite occur. 
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 (I made the left cover slanted to achieve more points along vertical and prove my point) (I made the left cover slanted to achieve more points along vertical and prove my point)
  
-{{dylanw:contourPointsCoveredLadder.jpg}}\\ +{{dylanw:contourpointscoveredladder.jpg}}\\ 
  
 When the ladder is tilted. the detection of rectangles improved greatly (detecting the ladder rungs instead of the spaces in between ladder rungs now by using black colored covers).  When the ladder is tilted. the detection of rectangles improved greatly (detecting the ladder rungs instead of the spaces in between ladder rungs now by using black colored covers). 
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 Below is a picture of it. Below is a picture of it.
  
-{{dylanw:contourPointsTiltedLadder.jpg}}\\ +{{dylanw:contourpointstiltedladder.jpg}}\\ 
  
 This algorithm which uses contour points and the **approxPolyDP()** function is not effective to detect lines which are perfectly vertical or horizontal to the camera, like the ladder rungs.  This algorithm which uses contour points and the **approxPolyDP()** function is not effective to detect lines which are perfectly vertical or horizontal to the camera, like the ladder rungs. 
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 Here are some pictures. Here are some pictures.
  
-{{dylanw:ladderRungCanny.jpg}}\\  +{{dylanw:ladderrungcanny.jpg}}\\  
-{{dylanw:ladderRungSpaceCanny.jpg}}\\ +{{dylanw:ladderrungspacecanny.jpg}}\\ 
drexel_darwin_opencv.1478436484.txt.gz · Last modified: by dwallace