Increasing FPS while using OpenCV Face detection
performance,opencv,face-detection,fps
If you want to use the OpenCV algorithm without modifying it, you can extract a sub-image around the location of the faces at the previous frame. In this way the OpenCV face detector performs a sliding window search on a much smaller region. Then you remap the face position in...
Detecting face very fast from video using vision.CascadeObjectDetector in matlab
image,matlab,computer-vision,face-detection,matlab-cvst
There are a few of things you can try: Definitely move FaceDetect = vision.CascadeObjectDetector; outside of the loop. You only need to create the face detector object once. Re-creating it for every frame is definitely your performance bottleneck. vision.VideoFileReader returns a frame of class 'single' by default. If you change...
opencv Recognize function doesn't work correctly in C#
Face recognition is not a simple problem, because the human face can vary a lot between two attempts, it sounds to me like perhaps your recognizer is working correctly, but might not be trained as well as you like. The eigen method for face recognition is very sensitive to pose...
How to save detected face in Android using OpenCV?
The problem is, you are never trying to get the face pixels. After you detect face, I suggest you to do something such as: Mat mFaceMatrix = mRgba.submat(facesArray.y, facesArray.y + facesArray.heigth, facesArray.x, facesArray.x + facesArray.width); Now passing this matrix to createBitmap function should do the trick. Bitmap bitmap = Bitmap.createBitmap(mFaceMatrix.cols(),...
Face tracking with subtracting frames in video
matlab,tracking,face-detection,face-recognition,matlab-cvst
Try this example, which uses the Viola-Jones face detection algorithm, and the KLT (Kanade-Lucas-Tomasi) algorithm for tracking.
OpenCV 3.0 Beta - Python - Face Detection via Webcam - code gives me error
python,opencv,image-processing,webcam,face-detection
i guess, you wanted a 'continuous detection, not a 'single shot' one, right ? you're just some small changes away: import numpy as np import cv2 face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') if face_cascade.empty(): raise Exception("your face_cascade is empty. are you sure, the path is correct ?") eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml') if eye_cascade.empty(): raise...
is it possible to apply car detection on IMAGE using haar cascade method in OpenCV?
java,android,opencv,computer-vision,face-detection
Just compare the center of the detection rectangle from the previous frame to that in the current frame. If the center has not changed too much, it is likely the same object. In that case, don't count the "new" rectangle in the current frame.
Face Detection using opencv and python
some webcams need a warmup time, and deliver empty frames on startup. you want to check for that. also, who said , that cv2.rectangle returns anything ? where did you get that idea ? from SO ? while cap.isOpened(): s, img = cam.read() if s == None: gray = cv2.cvtColor(img,...
Developing Face Recognition App
I have worked with Face recognition for a while. If you want to use OpenCV you could do a better effort searching in SO and you can found things like this one. The best one for me is the SDK provide by lockheed martin... but it's too expensive :S for...
python 2.7 and opencv code gives cvtcolor error
python,opencv,webcam,using,face-detection
You need to check if "ret == True' before going on with cvtColor. The code should look like this: faceCascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') video_capture = cv2.VideoCapture(0) while True: ret, frame = video_capture.read() if ret == True: gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) faces = faceCascade.detectMultiScale( frame, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30), flags=cv2.cv.CV_HAAR_SCALE_IMAGE ) #...
Faces not getting detected from Kinect Feed
c#,kinect,emgucv,face-detection
Ok I got it to work finally. The problem was the Point[j,i] which should have been Point[i,j] . Also my FaceDetection method proved to be a little erratic and I had to fix that too to finally properly debug my code....
python face detection raspberry pi with picamera
python,face-detection,raspberry-pi2
The problem is in your camera.capture_continuos. First value, output, cannot be just an array as it records with an infinite iteration as the docs says. Instead of this you should put an output file. If you want an stream to capture this you can use the io.Bytes as well. In...
why is shape-indexed-feature so effective on face alignment?
opencv,computer-vision,face-detection,face-recognition
A shape-indexed-feature is a feature who's index gives some clue about the hierarchical structure of the shape that it came from. So in face alignment, facial landmarks are extremely important, since they are the things that will be useful in successfully aligning the faces. But, just taking facial landmarks into...
iOS - Issues cropping an image to a detected face
ios,objective-c,uiimage,crop,face-detection
For anyone else having a similar issue -- transforming CGImage coordinates to UIImage coordinates -- I found this great article explaining how to use CGAffineTransform to accomplish exactly what I was looking for.
Take photo when face detected
android,camera,android-camera,face-detection
FaceDetectionListener faceDetectionListener = new FaceDetectionListener(){ private boolean processing = false; public void setProcessing(boolean processing) { this.processing = processing; } @Override public void onFaceDetection(Face[] faces, Camera camera) { if (processing) return; if (faces.length == 0){ prompt.setText(" No Face Detected! "); }else{ //prompt.setText(String.valueOf(faces.length) + " Face Detected :) "); try{ camera.takePicture(myShutterCallback,myPictureCallback_RAW, myPictureCallback_JPG);...
Using iOS CIDetector face detection to trigger function
ios,avfoundation,face-detection
In your storyboard you should add a new view to the main view and create the outlet: @property (weak, nonatomic) IBOutlet UIView *containerView; And the button that you add should be on the same hierarchical as the newly created subview. Also the button should be in front of the newly...
open eye and closed eye in android by Android eye detection and tracking with OpenCV
java,android,opencv,face-detection,eye-tracking
I've no idea whether there is any library for that, but using technique descirbed in article Eye-blink detection system for human–computer interaction by Aleksandra Królak and Paweł Strumiłło (you can download it here and here and here is some simplified version) in my opinion is a good option. Generally this...
OutOfMemoryError after Facededetion
java,out-of-memory,face-detection,openimaj
The reason you got failed is because of image processing algorithm used. I'm not sure what openimaj uses, but there are two workarounds possible for this: Increase heap size, so that your application has more memory available for image processing. See How can I increase the JVM memory? Decrease image...
error LNK2019 while runing face detection in opencv using visual studio
c++,opencv,visual-studio-2013,face-detection
cv::CascadeClassifier::CascadeClassifier(void) constructor call doesn't seem to exist. Check openCV documentation here - http://docs.opencv.org/modules/objdetect/doc/cascade_classification.html Seems like a linking problem. Check if you have similar problems like here http://answers.opencv.org/question/9421/cascade-classifier-for-eye-detection-errors-while-compiling/...
Haar-Cascade Classifier increase accuracy in face detection
opencv,face-detection,haar-classifier
internally, the CascadeClassifier does several detections, and groups those. minNeighbours (in the detectMultiScale call) is the amount of detections in about the same place nessecary to count as a valid detection, so increase that from your current 2 to maybe 5 or so, until you start to miss positives....
Crop Face Using Image Detection in Android
java,android,image,face-detection,resize-crop
createBitmap(Bitmap source, int x, int y, int width, int height) receives a start X and start Y, and a width and height value, not an end X and end Y. If you change your commented-out code to this it should work: mIV.setImageBitmap(Bitmap.createBitmap(mFaceBitmap,cropXinit,cropYint,cropXend-cropXinit,cropYend-cropYinit)); ...
face alignment for face recognition
c++,opencv,math,face-detection,face-recognition
For rotating(counterclockwise by an angle θ) a point (x,y) around another point (p,q) you need to use: x′ = (x−p)cos(θ)−(y−q)sin(θ)+p, y′ = (x−p)sin(θ)+(y−q)cos(θ)+q. where x',y' are coordinates after rotation. In your case (p,q) is the center of the image if you rotated around center. Detailed Explanation could be found here:...
AVFoundation - Detect face and crop face area?
Here is the answer - (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { // when do we start face detection if (!_canStartDetection) return; CIImage *ciimage = [CIImage imageWithCVPixelBuffer:CMSampleBufferGetImageBuffer(sampleBuffer)]; NSArray *features = [_faceDetector featuresInImage:ciimage options:nil]; // find face feature for(CIFeature *feature in features) { // if not face feature ignore if (
OpenCV haarcascade_frontalface detection region
You cannot reply on OpenCV to do this because its model is trained based on face images just like the first one. That is to say, it is supposed to give face detections like the first one. Instead, consider to crop the detected rectangles a little bit, whatever size you...
how to specify the threshold of weak classifier for adaboost method of face detector
face-detection,adaboost,viola-jones
The parameter theta_j is calculated for each feature by the weak learner. Viola and Jones' approach was better documented in their 2004 version of their paper, and, IMHO, is very similar to a ROC analysis. You must test each one of your weak classifiers against the training set looking for...
Android API face detection vs. OpenCV/JavaCV face detection
Suggestion: If you are looking for face detection, I suggest you use platform specific APIs like FaceDetector rather than OpenCV Java wrapper. This is since those API's would be hardware accelerated(GPU) unlike OpenCV face detection which till version 3.0 relied on CPU only. The speed difference you perceive between desktop...
How do you fit AAM generated using Tim Cootes toolbox to a new image?
image-processing,computer-vision,face-detection
Actually, I think you can't. You have to provide a set of initial landmarks from which the search will start. That's because the program implements the ASM search only and does not include any face or eye detector to find a starting point for the algorithm. Try Stephen Milborrow ASM/AAM...
Android Layout align gender icon with age on facebox
android,android-layout,face-detection
use framelayout ( relativelayout over image) and align it . then resize the image differently and put it in linearlayout with textview.
Thumbnails with Face Detection in PHP
php,thumbnails,crop,face-detection
Can you increase the time limit? You can use set_time_limit() or change your php.ini if you have access to it. Also, how big is the detection.dat file? Loading the entire file in memory with file_get_contents() can take some time if the file is large. Unless you mess up with the...
OpenCV face detection working inconsistently on same image
java,android,opencv,face-detection
The problem is that your are not using the face detector (CascadeClassifier) class, but a face tracker (DetectionBasedTracker) based on that detector. I didn't find this class in the official documentation and did not look into the code, so i can't tell you exactly how it works, but according to...