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Questions tagged [viola-jones]

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.

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Viola jones bounding box and rotated faces

Can Viola jones detect faces which are bigger than(lets say a face of 128x128 in 256x256 image) 24x24 window? If yes how would it draw a bounding box since my understanding tells me the max size of window is 24x24 If trained on profile and rotated…
Niranjan Kotha
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Viola-Jones in Python with openCV, detection mouth and nose

I have an algorithm Viola-Jones in Python. I'm using haarcascade xml, which I load from openCV root file. But there wasn't any xml file for mouth and nose in openCV, so I downloaded these files from EmguCV. Result for detection of face is OK, but…
Kattynka
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OpenCV Cascade classifier - Can recognize some different objects?

my goal is detect different type of objects (green/red apples, coffee cup and a glass). I tried to using a cascade classifier to detect a generic apple in the scene and works successfully. There is some method to train my classifier to recognize the…
Akinn
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Can't find algorithm implementation in opencv

I cannot find the implementation of the Voila-Jones-algorithm that is useing Haar features in OpenCV. I have an example class from that I want to follow the method calls via F12 in VisualStudio. What I want is to jump througt the .cpp files to see…
Sarah
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Open CV face detection using viola opencv_core2410d.dll is missing

i am using Open CV for face detection using viola and i followed all the instructions here http://docs.opencv.org/2.4/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#windows-visual-studio-how-to but it…
user3102020
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Can I use a .vec file with one positive image for OpenCV object detection if my object is standardized?

I'm building a classifier to detect an electrical outlet. Specifically the three holes of an outlet, like so: Do I need to do something more than create a .vec file with quite a bit of angle variation to generating positives using OpenCV's…
JohnAllen
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Viola-Jones face detection: high contrast among pixels

We are using Viola-Jones for face detection. The algorithm works pretty well, with virtually no false positives. However, we have false negatives. We detected one very clear pattern for false negatives, which is a very high contrast between the grey…
Alejandro Simkievich
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mobile OpenCL local memory bank conflict. Why using local memory is slower than does global memory in kernel?

I'm developing face detection app in android platform using OpenCL. Face detection algorithm is based on Viola Jones algorithm. I tried to make Cascade classification step kernel code. and I set classifier data of cascade stage 1 among cascade…
youngwan lee
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opencv train classifier never contiueus 3 stage

I am trying to learn the cascade classifier to learn license plates. I'm running OpenCV 2.4.9 on a Windows 7 server with 16 GB RAM and i7 processor of 3,4 GHz. I want to train the classifier, but it never continuous stage 3. This is how I made my…
technobadboy
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Plotting ROC curves for viola-jones results

I have to measure my results for a face detector, for example, and found on articles like the Viola-Jones one that the most used statistical curve used for this measure is a ROC curve. But I can't find any way to plot a ROC curve on GNU/Linux, only…
Felipe Corrêa
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Using opencv + viola jones running slow

I am trying to implement Face detection viola jones classifier using opencv cascade. This is the code i am using: int main( ){ SYSTEMTIME tm; GetLocalTime(&tm); printf("Date: %02d.%02d.%d, %02d:%02d:%02d:%02d\n", tm.wDay, tm.wMonth, tm.wYear,…
Hadi
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Face detector in OpenCV becoming slow when there is no face in the frame

I am trying to implement face detection program with webcam input using Viola-Jones face detector in OpenCV and it works fine except that it becomes about 10 times slower when no face is detected in the frame. This is really weird because if there…
IKS
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Pixels Per Foot (PPF) required for various image processing algorithms?

I'm working on a project in which images/video will need to be processed in order to detect certain objects within the frame. For this project, I'm in charge of selecting hardware (image sensor, lens, processor, etc), and I'd like to select the…
MandM
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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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