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2020-10-05 07:09:55 -0600	received badge	● Popular Question (source)
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2014-03-06 23:34:02 -0600	received badge	● Popular Question (source)
2013-05-12 10:02:32 -0600	asked a question	extruct 3D points Hi Is there any function in opencv API to get the 3D coordonate of the 3D model to use it in the solvePNP function? How can i get the 3d coordonate then?
2013-05-07 07:16:29 -0600	commented question	skin detection I want to delete the question but i can't ,so that i tried to delete the code unfortunately it works.I'm sorry i couldn't return it. The delete button doesn't work! any idea how can I delete it?
2013-04-18 03:48:03 -0600	commented answer	skin detection i'm sorry i forget it thank you
2013-04-18 02:57:14 -0600	answered a question	skin detection Hi, this is the code of skin detection, my problem is that i always get the size of contours=0. boolean first_frame; Rect windows; /we use the first_frame variable to flag the first frame and the subsequent frames. On the first frame, we detect faces using the built-in cascade classifier. On the next frames, we use skin detection to detect faces./ void detectionface(Mat frame,CascadeClassifier cascade,MatOfRect faces) { Log.i("skindetection","enter detection function"); if (cascade.empty()) Log.i("cascade", "null"); first_frame= true; while(true) { if (frame.empty()) { Log.i("skindetection","frame is empty"); break; } if (first_frame ) { // we convert the frame to grayscale, increase the image contrast, and perform object detection. Imgproc.equalizeHist(frame, frame); Log.i("skindetection","enter equalizeHist"); if (frame.empty()) Log.i("skindetection", "frame empty"); cascade.detectMultiScale(frame, faces, 1.1, 2, 2, // TODO: objdetect.CV_HAAR_SCALE_IMAGE new Size(50, 50), new Size()); if (faces.empty()) Log.i("skindetection","faces empty"); else { Rect[] facesArray=faces.toArray(); Log.i("skindetection","la taille est"+facesArray.length); for (int i = 0; i < facesArray.length; i++) { //Set a search window windows for each detected face. Point pt=new Point(facesArray[i].tl().x + facesArray[i].width/2, facesArray[i].tl().y + facesArray[i].height/2); Log.i("skindetection","point ok"); Rect win=new Rect(); win.width = 120; win.height = 120; win.x = (int) (pt.x - win.width/2); win.y = (int) (pt.y - win.height/2); Log.i("skindetection","rect ok"); windows=win; Log.i("skindetection","end loop"); } Log.i("skindetection","first done"); first_frame = false; } } else { //Given the search windows in windows, loop to get a search window and detect the skin. for (int i = 0; i < 1; i++) { Rect win = windows; //we have to crop to make sure the window is inside the image. We then use the window to set the region of interest (ROI). win.x = Math.max(win.x, 0); win.y = Math.max(win.y, 0); win.width = Math.min(win.width, frame.cols() - win.x);//frame win.height = Math.min(win.height, frame.rows() - win.y); Imgproc.cvtColor(frame, frame, Imgproc.COLOR_GRAY2BGR); Mat subimg = new Mat(frame, win); Log.i("skindetection","subimag created"); //Convert the subimg to the HSV colorspace and threshold the image for pixels with skin tone. Mat hsv=new Mat(); Imgproc.cvtColor(subimg, hsv, Imgproc.COLOR_BGR2HSV); /* The bw image now contains some contours with the largest contour being the face. We call detectLargestBlob() function to select the largest contour. The function will return a Rect and we use it to update the face position./ Mat bw=new Mat(); Core.inRange(hsv, new Scalar(0,51,89), new Scalar(17,140,255), bw); facesArray[i] = detectLargestBlob(bw); //Adjust the position of the search window to make it "follow" the detected face: facesArray[i].x += win.x; Log.i("skindetection","after detect blob"); facesArray[i].y += win.y; } } } } /* * Detect the largest blob in a binary image */ Rect detectLargestBlob(Mat bw) { if (bw.empty()) Log.i("skindetection","bw empty"); Log.i("skindetection","enter function"); List ... (more)
2013-04-16 07:49:52 -0600	commented answer	skin detection As i'm a new user i must wait 2 days before answering my own question.so i'll post it tomorrow.thanks Steven
2013-04-16 03:18:50 -0600	commented answer	skin detection Thank you Steven ,i changed it as you have mentioned it but i still have the same problem, can i put all the skin detection code here? or it's not allowed? i don't know if it will be rude ? please i need help really .and thank you again
2013-04-15 16:21:35 -0600	commented answer	skin detection actually i combine skin detection and the viola & jones algorithm. and i'm not asking about the best algorithm to detect face.and my question is clear :get contours size=0 after the findcontours function so if you haven't understand any questions please don't answer it . and thank you for the effort you had made.
2013-04-15 08:44:52 -0600	asked a question	skin detection Hi I am trying to do skin detection to detect face regions. I have done the following but I always get contours size = 0. I can't figure out the problem. Please guide me to a solution. `/**`
2013-04-15 08:43:18 -0600	asked a question	skin detection_find contour hi i'm trying to do skin detection to detect face.i have done `List<MatOfPoint> contours=new ArrayList<MatOfPoint>(); Mat hierarchy = new Mat(new Size(250, 250), CvType.CV_8UC1, new Scalar(0)); Imgproc.findContours(bw.clone(), contours, hierarchy, Imgproc.RETR_EXTERNAL,Imgproc.CHAIN_APPROX_NONE); Log.i("skindetection","findcontours1 function"); if (contours.size()==0) { Log.i("skindetection"," size contour =0"); return (new Rect(0, 0, bw.cols(), bw.rows())); }` But i always get contours size=0. i can't figure out the problem.please guide me.
2013-04-14 01:56:22 -0600	asked a question	Core max function hi, what is the equivalent of this function in opencv wrapper java: `Rect win; win.x = std::max(win.x, 0);` thank you.
2013-04-09 11:49:07 -0600	asked a question	How to calibrate the camera of my mobile device? Hi, is there a function to do calibration of the camera of my mobile device? My idea is to calibrate the head on an oval so that the application has the necessary coördinate to place a 3D object on top of it. Thank you in advance.
2013-04-04 08:57:38 -0600	asked a question	opencv face detection hi I want to convert the detected face rectangle (the original face detection sample)into a 3D coordinates . I have the intrinsic parameters of my camera, how can I determine the depth Z? using the projection equation? how can i get the face depth ? x = fx X / Z + u y = fy Y / Z + v I understand that fx fy and u v are intrinsic parameters, x y are given by the detected face rectangle.what does the X,Y represents?
2013-04-04 05:11:54 -0600	commented question	How to replace a certain ROI with another image? you can be inspired from this project :http://www.mediafire.com/?3wd897cpwu0s1pa. this project allows to detect the eyes and insert images of fire there. it's not a java code.
2013-04-04 04:35:03 -0600	commented question	How to replace a certain ROI with another image? do you want to superimpose an image over the face?
2013-04-03 08:13:48 -0600	commented answer	face detection sample actually i'm using vuforia sdk and i want to change the tracking part of the vuforia sdk by using the opencv. i have a calibrated vuforia camera. i don't know how can i use the detected face?
2013-04-03 06:20:34 -0600	asked a question	face detection sample hi,i have a few question concerning the face detection sample.What does the face detection provides ? does it provide a pose with respect to the camera ? a 3D point in the camera reference frame ? (and if yes, how are the camera axis defined ?)
2013-04-02 11:32:43 -0600	asked a question	point coordinate hi, i have the facedetection sample where i have Rect[] facesArray = faces.toArray(); i wanna know if these two points: facesArray[i].tl() and facesArray[i].br() are calculated from the camera pose? if they aren't ,how they are calculated then?
2013-04-02 09:27:34 -0600	asked a question	3D point in the camera reference frame HI, i have made the face detection using the cascade classifier,the detection returned a MatOfRect from which i have extracted two points, now i wanna know how can i get the 3D point in the camera reference frame from the points i have extracted from the detected region of face.
2013-03-26 03:09:55 -0600	commented answer	problem in cvtColor function thank you it is clear now.
2013-03-25 05:53:03 -0600	commented question	problem in cvtColor function also what does this: Imgproc.cvtColor(mRgba, mGray, Imgproc.COLOR_BGRA2GRAY); in t he face detection sample?does it mean that we convert mrgba matrix into 1 chanel and stored in mgray matrix?
2013-03-25 05:35:07 -0600	asked a question	problem in cvtColor function Hi,I have a native methode which play frame so i retreive the pixels of the image into a byte [] buffer and call a java methode to proceed the processing : public void processCameraImage(byte[] buffer, int width, int height) { System.out.println("setRGB565CameraImage....intent received..."); Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); Mat inputFrame= new Mat(); inputFrame.put(0, 0, buffer); if(inputFrame.channels()==1) { /* Grayscale / Log.i("grayscale", "grayscale"); Imgproc.cvtColor(inputFrame, mGray, Imgproc.COLOR_GRAY2BGR565); // i have a problem here// } else if (inputFrame.channels()==4) { / ARGB or RGBA image / Log.i("ARGB or RGBA", "ARGB or RGBA"); } else { / RGB, BGR, HSV, or any other 3-channel representation */Log.i("RGB, BGR, HSV", "RGB, BGR, HSV"); } //ect } i have this in logcat: 03-24 11:23:45.322: I/System.out(9915): setRGB565CameraImage....intent received... 03-24 11:23:45.362: D/dalvikvm(9915): GC_CONCURRENT freed <1K, 22% free 8108K/10311K, paused 1ms+3ms 03-24 11:23:45.372: I/grayscale(9915): grayscale 03-24 11:23:45.372: W/dalvikvm(9915): JNI WARNING: JNI method called with exception pending 03-24 11:23:45.372: W/dalvikvm(9915): in Lcom/qualcomm/ar/pl/CameraPreview;.newFrameAvailable: (IIII[B)V (CallIntMethodV) 03-24 11:23:45.372: W/dalvikvm(9915): Pending exception is: 03-24 11:23:45.372: I/dalvikvm(9915): java.lang.NullPointerException: 03-24 11:23:45.372: I/dalvikvm(9915): at org.opencv.imgproc.Imgproc.cvtColor(Imgproc.java:4354) 03-24 11:23:45.372: I/dalvikvm(9915): at com.qualcomm.QCARSamples.ImageTargets.ImageTargets.processCameraImage(ImageTargets.java:524) 03-24 11:23:45.372: I/dalvikvm(9915): at com.qualcomm.ar.pl.CameraPreview.newFrameAvailable(Native Method) Please i need help as soon as possible i'm stucked here.
2013-03-24 05:24:04 -0600	asked a question	release mat Hi,how can i release a mat with native code?
2013-03-24 03:09:16 -0600	asked a question	change the camera access Hi, how can i change the camera access ?i don't want to use CvCameraView :i meant that i have an application which display the video and i want to use face detection sample with it.
2013-03-23 11:55:03 -0600	asked a question	make Mat from buffer byte Hi, I have a Byte buffer and i want to make a Mat.How can i achieve it using a java code?Should i make a bitmap with the byte buffer first then transform it to Mat?
2013-03-23 03:45:51 -0600	received badge	● Scholar (source)
2013-03-23 01:58:17 -0600	asked a question	native opencv for android project I tried to integrate opencv library in my android project so i followed this link: http://stackoverflow.com/questions/13353647/building-native-opencv-for-android-with-eclipse-gives-undefined-reference-to-c?answertab=oldest#tab-top but now i still have these errors: jni/DetectionBasedTracker.cpp:5:23: error: opencv/cv.h: No such file or directory jni/DetectionBasedTracker.cpp:6:28: error: opencv/highgui.h: No such file or directory should i change the application.mk?
2013-03-23 01:55:19 -0600	received badge	● Critic (source)
2013-03-22 12:03:58 -0600	answered a question	integrate opencv is there any tutorial of how to change android.mk file to integrate opencv?
2013-03-19 03:39:49 -0600	commented answer	integrate opencv thx but i'm using eclipse (to make apps under the android platform) not visual studio.I don't think that they have the same issue isn't?