The Viola–Jones object detection framework is the first object detection framework to provide competitive object detection rates in real-time proposed in 2001 by Paul Viola and Michael Jones.
Questions tagged [viola-jones]
90 questions
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How to search for an object between desired pixels?
As I mentioned in my previous question I can't get accurate results about detecting facial features with Viola - Jones algorithm. Especially while obtaining eyes singly and mouth, it does not work well. But there's no problem about detecting face,…
KMetin
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Can XML files be read quickly using pure C?
I am designing a face detection system using pure C. I don't wanna go though too much trouble of coding the training algorithm in C when it is easily available in openCV for Viola-Jones and LBP. However, i noticed that in openCV the training data is…
hamede
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Face Detection Algorithms with minimal training time
Wanted to ask if there was any kind of face detection scheme suitable for video that would require minimal training time ideally about a few days rather than weeks like the Viola-Jones. I have read about LBP but it requires a huge set of training…
hamede
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How to save a 2-Dimensional array to a file in C?
I am an beginner C programmer and I am currently working on a project to implement viola jones object detection algorithm using C. I would like to know how I would be able to store data in a 2-Dimensional array to a file that can be easily ported…
medz91
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Is the threshold of Haar-feature is calculated by the only way, Viola-Jones described in their paper?
I am implementing Viola-Jones face detection algorithm and bit confused about haar-feature threshold. I am calculating the threshold of haar-feature using follow. steps:
a) Calculate the haar-feature value in all positive(face) images respective to…
user2766019
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How can I see inside cvHaarDetectObjects() in openCV?
I am trying to optimize the Viola-Jones code written in pure C code since it takes longer to detect faces than the code using the openCV function.
I want to see how cvHaarDetectObjects function actually work but I can't find how.
Can anybody help me…
IKS
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Understaing V&J (Haar.cpp) sliding window
I'm going over the code of haar.cpp to understand the sliding window approach. Here is the code:
for( factor = 1; ; factor *= scaleFactor )
{
CvSize winSize = { cvRound(winSize0.width*factor),
…
GilLevi
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How often and where is each feature used in the Viola-Jones detector?
This is a question about the Viola-Jones Algorithm (used for face detection) as described here
http://en.wikipedia.org/wiki/Viola%E2%80%93Jones_object_detection_framework
and in the original…
Kenyakorn Ketsombut
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Can Viola-Jones face detection in opencv works for 25 feet?
Can Viola-Jones face detection in opencv works for 25 feet? If the camera is good and capable of good quality picture is it possible for Viola-Jones to detect the face?
2vision2
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Cropping before using viola jones face detection
I am trying to improve face detections and i am using an implementation of viola jones algorithm in OpenCV. I am not getting the results that i desire, so i want to have some preprocessing before using the cascade.detectMultiScale function. The…
ankitsingh
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How can i use Viola Jones Algorithm to detect the Face as a region of interest and crop it till the rectangle box?
I want to detect the face in the video frame and remove the other elements such as background etc. and just want to focus on the facial region, for this i need to use viola jones algorithm, czn anyone give me a hint or suitable answer for…
Yoga Srinivas Reddy
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Detect car trailer
To detect a car trailer its very hard. There're a lot of car trailers that has the same license plate as the car itself. To detect if its a trailer I need to search in a area around the license plate. I already making a detector for the license…
Martijn van Wezel
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Feature computation in viola and jones
In the section of attentional cascade they have discussed a basic 2 feature strong classifier. While discussing the computation of this weak classifier they required
Evaluate the rectangle features (requires between 6 and 9 array references per…
user2793078
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OpenCV Cascade Classification: Fast contrast stretching Constant
In the paper "Empirical analysis of detection cascades of boosted classifiers for rapid object detection", section 2.3, the authors talk about fast contrast stretching. I do not see in OpenCV or Matlab any reference to this preprocessing. Normally…
satideur
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