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Search found 340 results on 14 pages for 'opencv'.

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  • OpenCV rotation solution?

    - by sundowatch
    I am using those codes for rotation transforming an image, but it doesn't work. Waht is the problem? IplImage *src = cvLoadImage("image.jpg",1), *dst = cvCloneImage(src); CvMat *rotation_mat = cvCreateMat(2,3,CV_32FC1); CvPoint2D32f center = cvPoint2D32f(src->width/2 ,src->height/2); cvZero(dst); double angle = -50.0, scale = 0.6; cv2DRotationMatrix(center, angle, scale, rotation_mat); cvWarpAffine(src, dst, rotation_mat); cvNamedWindow("rotation"); cvShowImage("rotation",dst); cvWaitKey(0); cvReleaseMat(&rotation_mat); cvReleaseImage(&src); cvReleaseImage(&dst); cvDestroyAllWindows(); return 0;

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  • selecting the pixels from an image in opencv

    - by ajith
    hi everyone, this is refined version of my previous question http://stackoverflow.com/questions/2602628/computing-matting-laplacian-matrix-of-an-image actually i want to do following operation... summation for all k|(i,j)?wk [(Ii-µk)*(Ij-µk)]...where wk is 3X3 window & µk is mean of wk...here i dont know how to select Ii & Ij separately from an image which is 2 dimensional[Iij]...or does the eqn means anything else??please someone help me..

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  • Dealing with sequences in OpenCV?

    - by Farhad
    I have 2 sequences. One (lets call this cvSeq x), which contains a number of contours (derived from cvFindContours) and a second (lets call this cvSeq y) which I have used cvCreateSeq upon, but doesn't actually have anything in it. I am looping through all the contours in x, and if a contour meets specific criteria, I add it to y. I am able to do the looping, but I don't know how to add an contour in x to y if it meets the criteria. Does anyone know how to add a contour in a sequence to another sequence (that is empty)? Code examples will be appreciated. PS: cvStartFindContours is not an option.

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  • OpenCV SVD Matrix format.

    - by Rick
    I currently have a set of 2D Cartesian coordinates e.g. {(1,3), (2,2), (3,4)} Which will be put into a 2D array, to perform SVD properly would the matrix be put together such that the coordinates form the columns or the rows e.g. 1 3 2 2 3 4 or 1 2 3 3 2 4 I have been doing a little trial and error comparing to examples of SVD I have found online, the resulting matrix usually seems to be negated, with some of the values shuffled around. To clarify further if I had a matrix E which was MxN as shown here http://upload.wikimedia.org/wikipedia/commons/b/bb/Matrix.svg To define the matrix as a 2D array would it be Array[M][N] or Array[N][M] I am assuming this actually matters due to matrix arithmetic not being commutative? Can anyone actually verify this?

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  • video processing with opencv

    - by mithila
    i'm trying to detect car in a video file.i can do background subtraction and the moving cars are visible as foreground object. but i can't draw rectangle around the car. how can i do it? or how can i say in a particular area of the frame there is a car/or there is no car now.please help.

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  • Opencv: Converting hue image to RGB image

    - by jhaip
    I am trying to show the hue component of the image from my webcam. I have split apart the image into the hue component but I can't figure out how to show the hue component as the pure colors. For example if one pixel of the image was B=189 G=60 R=60 then in HSV, H=0. I don't want the draw image to be the the gray values of hue but the RGB equivalent of the hue or H=0 - B=0 G=0 R=255 IplImage *image, *imageHSV, *imageHue; image = cvQueryFrame(capture); //image from webcam imageHSV = cvCreateImage( cvGetSize(image), IPL_DEPTH_8U, 3 ); imageHue = cvCreateImage( cvGetSize(image), IPL_DEPTH_8U, 1 ); cvCvtColor( image, imageHSV, CV_BGR2HSV ); cvSplit( imageHSV, imageHue, 0, 0, 0 ); I have a feeling there is a simple solution so any help is appreciated.

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  • opencv image conversion from rgb to hsv

    - by kaushalyjain
    When I run this following code on a sample image ie an rgb image; and then execute it to display the converted hsv image, both appear to be different... can anyone explain why? or can you suggest a solution for this not to happen... coz its the same image afterall Mat img_hsv,img_rgb,red_blob,blue_blob; img_rgb = imread("pic.png",1); cvtColor(img_rgb,img_hsv,CV_RGB2HSV); namedWindow("win1", CV_WINDOW_AUTOSIZE); imshow("win1", img_hsv);

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  • Color separation in OpenCV?

    - by user225626
    Is there a function or a series of function steps that roughly equate to... get every pixel from myInput which doesn't meet an arbitrary Green quantity threshhold set each of those pixels to black on myOutput Thanks for any assistance.

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  • Synchronizing screencasting (ffmpeg) and capturing from the webcam (OpenCV)

    - by lyuba
    As from my previous questions, I am trying to build a simple eye tracker. Decided to start from a Linux version (run Ubuntu). To complete this task one should organize screencasting and webcam capturing in such way that frames from both streams exactly match each other and there is the same number of frames in each of them totally. Screencasting fsp fully depends on the camera's fsp, so each time we get the image from the webcam we can potentially grab a screen frame and stay happy. However, all the tools for the fast screencasting, like ffmpeg, for example, return the .avi file as the result and require the fsp already known to be started. From the other side, tools like Java+Robot or ImageMagick seem to require around 20ms to return the .jpg screenshot, which is pretty slow for the task. But they may be requested right after each time the webcam frame is grabbed and provide the needed synchronization. So the sub-questions are: 1. Does the USD camera's frame rate vary during a single session? 2. Are there any tools which provide fast screencasting frame by frame? 3. Is there any way to make ffmpeg push a new frame to the .avi file only when program initiates this request? For my task I may either use C++ or Java. I am, actually, an interface designer, not the driver programmer, and this task seems to be pretty low-level. I would be grateful for any suggestion and tip!

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  • Segmenting and masking all shades of red from an image using opencv

    - by vrinda
    I am trying to segment all shades of red form an image using hue saturation values and use InRangeS function to create a mask which should have all red areas whitened and all others blacked(a new 1 channel image). Thwn Inpaint them to kind of obscure the segmented portions. My code is as given. However I am unable to get an output image, it doesnt segment the desired color range. Any pointers on my approach and why it isnt working. ? using namespace std; int main() { IplImage *img1=cvLoadImage("/home/techrascal/projects/test1/image2.jpeg"); //IplImage *img3; IplImage *imghsv; IplImage *img4; CvSize sz=cvGetSize(img1); imghsv=cvCreateImage(sz,IPL_DEPTH_8U,3); img4=cvCreateImage(sz,IPL_DEPTH_8U,1); int width = img1->width; int height = img1->height; int bpp = img1->nChannels; cvNamedWindow("original", 1); cvNamedWindow("hsv",1); cvNamedWindow("Blurred",1); int r,g,b; // create inpaint mask: img 4 will behave as mask cvCvtColor(img1,imghsv,CV_BGR2HSV); CvScalar hsv_min = cvScalar(0, 0, 0, 0); CvScalar hsv_max = cvScalar(255, 0, 0, 0); //cvShowImage("hsv",imghsv); cvInRangeS( imghsv, hsv_min, hsv_max, img4 ); cvInpaint(img1, img4, img1, 3,CV_INPAINT_NS ); cvShowImage("Blurred",img1); cvReleaseImage(&img1); cvReleaseImage(&imghsv); cvReleaseImage(&img4); //cvReleaseImage(&img3); char d=cvWaitKey(10000); cvDestroyAllWindows(); return 0;}

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  • Detecting Markers Using OpenCV

    - by Hamza Yerlikaya
    I am trying to detect various objects containing colored markers, so a red blue green marker identifies object A, and a red blue red marker identifies object B. My problem is I can't use template matching cause objects can be rotated, currently I am thinking about check for each color then find the object by checking the distance between colors but it seems inefficient, so my question is there a better way to do this?

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  • OpenCv Error ( unhandeld exeption) after execute

    - by hamza
    Hi , i m using VS2010 i m trting to make a gray image more bright , the code did compile normaly but no change in the seconde picture , and an error message ( undhadled exeception .. .. ) showed up after that the execute is done showed up here is a peace of my code : int main(int argc, _TCHAR* argv[]) { IplImage *img = cvLoadImage("mra.jpg"); if (!img) { printf("Error: Couldn't open the image file.\n"); return 1; } //IplImage* new_image = getlargersize(img); double Min , Max ; Min = Max = 0 ; Max_Min (img , &Min , &Max); cout<<"the max value in the picture is :"<<Min<<" and the minimum value is :"<<Max<<endl ; IplImage* img2 = eclaircir(Min ,Max ,img); cvNamedWindow("Image:", CV_WINDOW_AUTOSIZE); cvNamedWindow("Image2:", CV_WINDOW_AUTOSIZE); cvShowImage("Image2:", img2); cvShowImage("Image:", img); cvWaitKey(0); cvDestroyWindow("Image2:"); cvDestroyWindow("Image:"); cvReleaseImage(&img2); cvReleaseImage(&img); return 0; } void Max_Min(IplImage* temp , double *min , double *max ){ CvScalar pix ; for (int i = 0 ; i < temp->height ; i++){ for (int j = 0 ; j < temp->width ; j++){ pix = cvGet2D(temp , i , j); if ( pix.val[0] >= *max ){ *max = pix.val[0]; } if ( pix.val[0] <= *min){ *min = pix.val[0]; } } } } IplImage* eclaircir (double min , double max , IplImage* image){ double temp = max - min ; CvScalar pix ; for (int i = 0 ; i < image->height ; i++){ for (int j = 0 ; j < image->width ; j++){ pix = cvGet2D(image , i , j); pix.val[0] = ( pix.val[0] - min)*255 ; pix.val[0] = pix.val[0]/temp ; cvSet2D(image , i , j , pix ); } } return image ; } thanks

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  • Convert image color space and output separate channels in OpenCV

    - by Victor May
    I'm trying to reduce the runtime of a routine that converts an RGB image to a YCbCr image. My code looks like this: cv::Mat input(BGR->m_height, BGR->m_width, CV_8UC3, BGR->m_imageData); cv::Mat output(BGR->m_height, BGR->m_width, CV_8UC3); cv::cvtColor(input, output, CV_BGR2YCrCb); cv::Mat outputArr[3]; outputArr[0] = cv::Mat(BGR->m_height, BGR->m_width, CV_8UC1, Y->m_imageData); outputArr[1] = cv::Mat(BGR->m_height, BGR->m_width, CV_8UC1, Cr->m_imageData); outputArr[2] = cv::Mat(BGR->m_height, BGR->m_width, CV_8UC1, Cb->m_imageData); split(output,outputArr); But, this code is slow because there is a redundant split operation which copies the interleaved RGB image into the separate channel images. Is there a way to make the cvtColor function create an output that is already split into channel images? I tried to use constructors of the _OutputArray class that accepts a vector or array of matrices as an input, but it didn't work.

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  • Why won't this work; opencv Mat_<float>

    - by user1371674
    I can't seem to get this to work. I'm trying to get the pixel value of an image but first need to change the color of the image, but since I cannot use int or just Mat because the values are not whole numbers, I have to use and because of that errors pop up when I try to run this on the cmd. int main(int argc, char **argv) { Mat img = imread(argv[1]); ofstream myfile; Mat_<float> MatBlue = img; int rows1 = MatBlue.rows; int cols1 = MatBlue.cols; for(int x = 0; x < cols1; x++) { for(int y = 0; y < rows1; y++) { float val = MatBlue.at<cv::Vec3b>(y, x)[1]; MatBlue.at<cv::Vec3b>(y, x)[0] = val + 1; } } }

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  • OpenCV compare two images and get different pixels

    - by Richard Knop
    For some reason the code bellow is not working. I have two 640*480 images which are very similar but not the same (at least few hundred/thousand pixels should be different). This is how I am comparing them and counting different pixels: unsigned char* row; unsigned char* row2; int count = 0; // this happens in a loop // fIplImageHeader is current image // lastFIplImageHeader is image from previous iteration if ( NULL != lastFIplImageHeader->imageData ) { for( int y = 0; y < fIplImageHeader->height; y++ ) { row = &CV_IMAGE_ELEM( fIplImageHeader, unsigned char, y, 0 ); row2 = &CV_IMAGE_ELEM( lastFIplImageHeader, unsigned char, y, 0 ); for( int x = 0; x < fIplImageHeader->width*fIplImageHeader->nChannels; x += fIplImageHeader->nChannels ) { if (row[x] == row2[x]) // the pixel in the first channel (usually G) { count++; } if (row[x+1] == row2[x+1]) // ... second channel (usually B) { count++; } if (row[x+2] == row2[x+2]) // ... third channel (usually R) { count++; } } } } Now at the end I get number 3626 which would seem alright. But, I tried opening one of the images in MS Paint and drawing thick red lines all over it which should increase the number of different pixels substantially. I got the same number again: 3626. Obviously I am doing something wrong here. I am comparing these images in a loop. This line is before the loop: IplImage* lastFIplImageHeader = cvCreateImageHeader(cvSize(640, 480), 8, 3); Then inside the loop I load images like this: IplImage* fIplImageHeader = cvLoadImage( filePath.c_str() ); // here I compare the pixels (the first code snippet) lastFIplImageHeader->imageData = fIplImageHeader->imageData; So lastFIplImageHeader is storing the image from the previous iteration and fIplImageHeader is storing the current image.

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  • openCV center of image rotation in C

    - by user1477955
    I want to rotate 90 degrees counterclockwise, but it seems the rotation point is wrong. How do I find the rotation center of the source image? img=cvLoadImage(argv[1],-1); height = img->height; width = img->width; step = img->widthStep; channels = img->nChannels; data = (uchar *)img->imageData; IplImage *rotatedImg = cvCreateImage(cvSize(height,width), IPL_DEPTH_8U,img->nChannels); CvPoint2D32f center; center.x = width/2; center.y = height/2; CvMat *mapMatrix = cvCreateMat( 2, 3, CV_32FC1 ); cv2DRotationMatrix(center, 90, 1.0, mapMatrix); cvWarpAffine(img, rotatedImg, mapMatrix, CV_INTER_LINEAR + CV_WARP_FILL_OUTLIERS, cvScalarAll(0)); cvShowImage("My image", rotatedImg );

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  • OpenCV haar training for static image

    - by Evl-ntnt
    I trying to train haar cascade classificator for card suite detection (which no rotation and has no distortion on image) For example I have file Clubs.png which contents clubs image on white background 20x20 pixels This tutorial is so tangled http://note.sonots.com/SciSoftware/haartraining.html My image varies only in sizes, no distortion or angling. Which commands I must enter in aim to get Clubs.xml file?

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  • How do I create an OpenCV image from a PIL image?

    - by scrible
    I want to do some image processing with OpenCV (in Python), but I have to start with a PIL Image object, so I can't use the cvLoadImage() call, since that takes a filename. This recipe (adapted from http://opencv.willowgarage.com/wiki/PythonInterface) does not work because cvSetData complains argument 2 of type 'void *' . Any ideas? from opencv.cv import * from PIL import Image pi = Image.open('foo.png') # PIL image ci = cvCreateImage(pi.size, IPL_DEPTH_8U, 1) # OpenCV image data = pi.tostring() cvSetData(ci, data, len(data)) I think the last argument to the cvSetData is wrong too, but I am not sure what it should be.

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  • OpenCV compliation on linux: how to feed to it specific zlib lib?

    - by myWallJSON
    I want to compile OpenCV with same zlib as I use for compilation of Boost Iostreams (not system default one). I want to compile OpenCV as static lib, having zlib compiled as static lib. Currently I use something like : ../$CMAKE_PATH -DCMAKE_INSTALL_PREFIX=./$OPENCV_INSTALL_SUBDIR -DBUILD_WITH_STATIC_CRT=ON -DBUILD_SHARED_LIBS=OFF -DBUILD_PYTHON_SUPPORT=OFF -DOPENCV_EXTRA_C_FLAGS=-fPIC -DOPENCV_BUILD_3RDPARTY_LIBS=TRUE make make install echo Done! I wonder: having some $ZLIB_HEADERS and $ZLIB_LIB_FILES_FOLDER path strings how to feed them into cmake to get OpenCV compiled with built by me zlib?

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  • Making a video with opencv and ffmpeg. How to find the right color format?

    - by luc
    I have a webcam video recorder program built with python, opencv and ffmpeg It works ok except that the color of the video is more blue than the reality. The problem seems to come from color format of images. It seems that OpenCv is giving BGR images and ffmpeg+libx264 is expecting YUV420p. I've read that YUV420p correspond to YCbCr. opencv has no conversion from BGR to YCbCr. It only has a conversion to YCrCb. I have made some searchs and tried different alternatives to try converting opencv image to something that could be ok for ffmpeg+libx264. None is working. At this point, I am a bit lost and I would appreciate any pointer that could help me to fix this color issue.

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  • Has anyone ever had OpenCV work with Python 2.7 on MacOS 10.6?

    - by ?????
    I've been trying on and off for the past 6 months to get OpenCV to work with Python on MacOS. Every time there's a new release, I try again and fail. I've tried both 64-bit and 32-bit, and both the xcode gcc and gcc installed via macports. I just spend the past two days on it, hopeful that the latest OpenCV release, that appears to include Python support directly would work. It doesn't. I've also tried and failed to use this: http://code.google.com/p/pyopencv/ I've been using OpenCV with C++ or Microsoft C++/CLI for the past few years, but I'd love to use it with Python on a Mac because that is my primary development environment. I'd love to hear from anyone who's actually been able to get the opencv python examples to run under Mac OS 10.6, either 32 or 64-bit. My last attempt was to follow the instructions on this page http://recursive-design.com/blog/2010/12/14/face-detection-with-osx-and-python/ with a clean, fresh install of 10.6 on a 64-bit capable Mac. My PYTHONPATH is set, and I can see the cv library in it. But an "import cv" from python fails. Previously, the closest I've ever gotten (again, staring on a clean, fresh 10.6 install) was this: Python 2.7.1 (r271:86882M, Nov 30 2010, 10:35:34) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import cv Fatal Python error: Interpreter not initialized (version mismatch?) Abort trap thrilllap-2:~ swirsky$ I've seen a lot of folks answering similar questions here, but have never seen an definitive answer for it.

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