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2021-01-26 13:16:05 -0500 received badge  Famous Question (source)
2020-10-21 14:58:13 -0500 marked best answer modify pixel of image with 0.01

hi, i have a image i want to modify it each pixel of image having 0 value with 0.01. below is the code to replace the value 0 with 0.01. but it is not doing any thing.

code -

for (int y=0; y<contrast.rows; y++)
{
        for (int x=0; x<contrast.cols; x++)
    {
    if(contrast.at<uchar>(y, x) ==0)
            contrast.at<uchar>(y, x) = 0.01;
    }
}

thanks

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2015-08-27 01:34:13 -0500 commented question Find angle and rotation of point

Dear LBerger, i want to know conceptually why this is being done to find 3 points. with a difference of 16. i know the meaning of operator %.

2015-08-27 01:19:09 -0500 commented question Find angle and rotation of point

can you explain me why the following is done : what is its meaning

cv::Point p0 = (pt>0) ? contour[pt%size] : contour[size - 1 + pt];
    cv::Point p1 = contour[(pt + r) % size];
    cv::Point p2 = (pt>r) ? contour[pt - r] : contour[size - 1 - r];
2015-08-27 01:09:33 -0500 commented question unable to understand this finger counting code

sorry for making duplicate

2015-08-27 00:34:09 -0500 asked a question unable to understand this finger counting code

hi, can anybody explain me this code: this code is for counting number of finger. this is the input image image description

 // feature extraction.cpp : Defines the entry point for the console application.
//
//--------------------------------------In the name of GOD
//-------------------------------BOW+SVM by Mohammad Reza Mostajabi
//#include "stdafx.h"
#include <opencv\cv.h>
#include <opencv\highgui.h>
//#include <opencv\ml.h>
#include <stdio.h>
#include <iostream>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/nonfree/features2d.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2\ml\ml.hpp>
#include <vector>
using namespace cv;
using namespace std;

using std::cout;
using std::cerr;
using std::endl;
using std::vector;

RNG rnga(12345);



inline void mix_channels(cv::Mat const &src, cv::Mat &dst, std::initializer_list<int> from_to)
{
    cv::mixChannels(&src, 1, &dst, 1, std::begin(from_to), from_to.size() / 2);
}

double angle(std::vector<cv::Point>& contour, int pt, int r)
{
    int size = contour.size();
    cv::Point p0 = (pt>0) ? contour[pt%size] : contour[size - 1 + pt];
    cv::Point p1 = contour[(pt + r) % size];
    cv::Point p2 = (pt>r) ? contour[pt - r] : contour[size - 1 - r];

    double ux = p0.x - p1.x;
    double uy = p0.y - p1.y;
    double vx = p0.x - p2.x;
    double vy = p0.y - p2.y;
    return (ux*vx + uy*vy) / sqrt((ux*ux + uy*uy)*(vx*vx + vy*vy));
}

int rotation(std::vector<cv::Point>& contour, int pt, int r)
{
    int size = contour.size();
    cv::Point p0 = (pt>0) ? contour[pt%size] : contour[size - 1 + pt];
    cv::Point p1 = contour[(pt + r) % size];
    cv::Point p2 = (pt>r) ? contour[pt - r] : contour[size - 1 - r];

    double ux = p0.x - p1.x;
    double uy = p0.y - p1.y;
    double vx = p0.x - p2.x;
    double vy = p0.y - p2.y;
    return (ux*vy - vx*uy);
}

bool isEqual(double a, double b)
{
    return fabs(a - b) <= 1e-7;
}
int main()
{

    Mat input = imread("C:\\Users\\Intern-3\\Desktop\\IPF\\2.png");

    Size size = input.size();
    int erosion_size = 1;
    Mat HSV, threshold;
    cvtColor(input, HSV, COLOR_BGR2HSV);
    inRange(HSV, cv::Scalar(0, 0, 100), cv::Scalar(0, 0, 255), threshold);

    Mat erodeElement = getStructuringElement(MORPH_RECT, cv::Size(5, 5));
    Mat dilateElement = getStructuringElement(MORPH_RECT, cv::Size(8, 8));

    erode(threshold, threshold, erodeElement);

    vector<vector<Point>> contours;
    vector<Vec4i> hierarchy;
    Mat mask = threshold;
    findContours(mask.clone(), contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE, Point(0, 0));

    /// Draw contours
    Mat drawing = Mat::zeros(mask.size(), CV_8UC3);
    for (int i = 0; i< contours.size(); i++)
    {
        Scalar color = Scalar(rnga.uniform(0, 255), rnga.uniform(0, 255), rnga.uniform(0, 255));
        drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, Point());
    }
    cout << "Contours = " << contours.size() << endl;
    for (int i = 0; i < contours.size(); i++)
    {
        cout << "area : " << contourArea(contours[i]) << endl;
    }
    imshow("contour", drawing);

    if (!contours.empty())
    {
        for (int i = 0; i<contours.size(); i++)
        {
            if (cv::contourArea(contours[i])>500)
            {
                Point center;
                std::vector<cv::Point> fingers;
                std::vector<cv::Point> contour;

                cv::Moments m = cv::moments(contours[i]);
                center.x = m.m10 / m.m00;
                center.y = m.m01 / m.m00;

                for (int j ...
(more)
2015-08-26 08:24:32 -0500 asked a question Find angle and rotation of point

hi , i want to find the angle. i find the following code can anyone explain me its meaning. here why p0,p1,p2 are being findout. what is the meaning of (uxvx + uyvy) / sqrt((uxux + uyuy)(vxvx + vyvy) and (uxvy - vx*uy) here.

double angle(std::vector<cv::Point>& contour, int pt, int r)
{
    int size = contour.size();
    cv::Point p0 = (pt>0) ? contour[pt%size] : contour[size - 1 + pt];
    cv::Point p1 = contour[(pt + r) % size];
    cv::Point p2 = (pt>r) ? contour[pt - r] : contour[size - 1 - r];

    double ux = p0.x - p1.x;
    double uy = p0.y - p1.y;
    double vx = p0.x - p2.x;
    double vy = p0.y - p2.y;
    return (ux*vx + uy*vy) / sqrt((ux*ux + uy*uy)*(vx*vx + vy*vy));
}

int rotation(std::vector<cv::Point>& contour, int pt, int r)
{
    int size = contour.size();
    cv::Point p0 = (pt>0) ? contour[pt%size] : contour[size - 1 + pt];
    cv::Point p1 = contour[(pt + r) % size];
    cv::Point p2 = (pt>r) ? contour[pt - r] : contour[size - 1 - r];

    double ux = p0.x - p1.x;
    double uy = p0.y - p1.y;
    double vx = p0.x - p2.x;
    double vy = p0.y - p2.y;
    return (ux*vy - vx*uy);
}

thanks!!

2015-05-28 00:40:29 -0500 asked a question How to find R,G,B percentage in an image

hi, i want to find red green and blue percentage in an image. i used the following code which shows 0%age for the red. help to improve my code.

below is code :

vector<Mat> channels;
split(hsv_img,channels);

Mat red, blue, green;
inRange(channels[0], Scalar(0), Scalar(10), red); // red
// ... do the same for blue, green, etc only changing the Scalar values and the Mat

double image_size = hsv_img.cols*hsv_img.rows;
double red_percent = ((double) cv::countNonZero(red))/image_size;

what shoud i change in scalar to have green and blue value.

thanks !!

2015-02-18 06:39:39 -0500 commented question error in facec

model = cv::createEigenFaceRecognizer();

i am getting error in this line only. if i removes this line code works well. an i removed the "initModule_contrib()"

2015-02-18 06:30:47 -0500 commented question error in facec

i already removed initModule_contrib(); funtion and converted the create function as you told . but still i am getting same error

2015-02-18 05:48:17 -0500 commented question error in facec

i have already included opencv_contrib2410 into my linker.

2015-02-18 05:33:52 -0500 commented question error in facec

how should i do it. i didn't get it.

2015-02-18 05:27:51 -0500 commented question error in facec

why i am getting the same error. i have included

#include <opencv2/opencv.hpp>
#include "opencv2/core/core.hpp"
#include "opencv2/contrib/contrib.hpp"
#include "opencv2/highgui/highgui.hpp"

these header files

2015-02-18 05:27:04 -0500 commented question error in facec

now this is my code :

if (facerecAlgorithm == "Eigenfaces") 
    model = cv::createEigenFaceRecognizer();

model->train(preprocessedFaces, faceLabels);
2015-02-18 05:26:11 -0500 commented question error in facec

still getting the same error

2015-02-18 04:55:54 -0500 asked a question error in facec

hi , i am getting error in facerecognizer in opencv 2.4.10. what should i do.

below is code :

Ptr<FaceRecognizer> learnCollectedFaces(const vector<Mat> preprocessedFaces, const vector<int> faceLabels, const string facerecAlgorithm)
{

    Ptr<FaceRecognizer> model;

    cout << "Learning the collected faces using the [" << facerecAlgorithm << "] algorithm ..." << endl;

    // Make sure the "contrib" module is dynamically loaded at runtime.
    // Requires OpenCV v2.4.1 or later (from June 2012), otherwise the FaceRecognizer will not compile or run!
    bool haveContribModule = initModule_contrib();
    if (!haveContribModule) {
        cerr << "ERROR: The 'contrib' module is needed for FaceRecognizer but has not been loaded into OpenCV!" << endl;
        exit(1);
    }

    // Use the new FaceRecognizer class in OpenCV's "contrib" module:
    // Requires OpenCV v2.4.1 or later (from June 2012), otherwise the FaceRecognizer will not compile or run!
    model = Algorithm::create<FaceRecognizer>(facerecAlgorithm);
    if (model.empty()) {
        cerr << "ERROR: The FaceRecognizer algorithm [" << facerecAlgorithm << "] is not available in your version of OpenCV. Please update to OpenCV v2.4.1 or newer." << endl;
        exit(1);
    }

    // Do the actual training from the collected faces. Might take several seconds or minutes depending on input!
    model->train(preprocessedFaces, faceLabels);

    return model;
}

error :

![image description](/upfiles/1424256649300074.png)
2015-02-09 23:46:57 -0500 asked a question OpenCV Visual Studio ntdll.dll

hi, I have trying to create a Project using OpenCV 2.4.10 on Visual Studio 2013, but I have had very little luck so far, owing to the following exceptions. Please suggest help. TIA.

Error which i am getting are :

Unhandled exception at 0x772A8C9E (ntdll.dll) in Color.exe: 0xC000007B: %hs is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support. Error status 0x.

image description

what should i do.

thanks!!

2015-02-09 06:58:24 -0500 asked a question Face Detect Kinect V2 + OpenCV

below is the code i am using for face detection. the porblem is that whenever the new frame arrives the face is detected in new windows each time. i want to display the frame in single windows. how can i do that.

thanks !!

code :

#include "stdafx.h"
#include <Windows.h>
#include <Kinect.h>
#include <Kinect.Face.h>
#include <opencv2/opencv.hpp>

#define _USE_MATH_DEFINES
#include <math.h>


template<class Interface>
inline void SafeRelease( Interface *& pInterfaceToRelease )
{
    if( pInterfaceToRelease != NULL ){
        pInterfaceToRelease->Release();
        pInterfaceToRelease = NULL;
    }
}

// Quote from Kinect for Windows SDK v2.0 Developer Preview - Samples/Native/FaceBasics-D2D, and Partial Modification
// ExtractFaceRotationInDegrees is: Copyright (c) Microsoft Corporation. All rights reserved.
inline void ExtractFaceRotationInDegrees( const Vector4* pQuaternion, int* pPitch, int* pYaw, int* pRoll )
{
    double x = pQuaternion->x;
    double y = pQuaternion->y;
    double z = pQuaternion->z;
    double w = pQuaternion->w;

    // convert face rotation quaternion to Euler angles in degrees
    *pPitch = static_cast<int>( std::atan2( 2 * ( y * z + w * x ), w * w - x * x - y * y + z * z ) / M_PI * 180.0f );
    *pYaw = static_cast<int>( std::asin( 2 * ( w * y - x * z ) ) / M_PI * 180.0f );
    *pRoll = static_cast<int>( std::atan2( 2 * ( x * y + w * z ), w * w + x * x - y * y - z * z ) / M_PI * 180.0f );
}

int _tmain( int argc, _TCHAR* argv[] )
{
    cv::setUseOptimized( true );

    // Sensor
    IKinectSensor* pSensor;
    HRESULT hResult = S_OK;
    hResult = GetDefaultKinectSensor( &pSensor );
    if( FAILED( hResult ) ){
        std::cerr << "Error : GetDefaultKinectSensor" << std::endl;
        return -1;
    }

    hResult = pSensor->Open();
    if( FAILED( hResult ) ){
        std::cerr << "Error : IKinectSensor::Open()" << std::endl;
        return -1;
    }

    // Source
    IColorFrameSource* pColorSource;
    hResult = pSensor->get_ColorFrameSource( &pColorSource );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IKinectSensor::get_ColorFrameSource()" << std::endl;
        return -1;
    }

    IBodyFrameSource* pBodySource;
    hResult = pSensor->get_BodyFrameSource( &pBodySource );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IKinectSensor::get_BodyFrameSource()" << std::endl;
        return -1;
    }

    // Reader
    IColorFrameReader* pColorReader;
    hResult = pColorSource->OpenReader( &pColorReader );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IColorFrameSource::OpenReader()" << std::endl;
        return -1;
    }

    IBodyFrameReader* pBodyReader;
    hResult = pBodySource->OpenReader( &pBodyReader );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IBodyFrameSource::OpenReader()" << std::endl;
        return -1;
    }

    // Description
    IFrameDescription* pDescription;
    hResult = pColorSource->get_FrameDescription( &pDescription );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IColorFrameSource::get_FrameDescription()" << std::endl;
        return -1;
    }

    int width = 0;
    int height = 0;
    pDescription->get_Width( &width ); // 1920
    pDescription->get_Height( &height ); // 1080
    unsigned int bufferSize = width * height * 4 * sizeof( unsigned char );

    cv::Mat bufferMat( height, width, CV_8UC4 );
    cv::Mat faceMat( height / 2, width / 2, CV_8UC4 );
    cv::namedWindow( "Face" );

    // Color Table
    cv::Vec3b color[BODY_COUNT];
    color[0] = cv::Vec3b( 255, 0, 0 );
    color[1] = cv::Vec3b( 0, 255, 0 );
    color[2] = cv::Vec3b( 0, 0, 255 );
    color[3] = cv::Vec3b( 255, 255, 0 );
    color[4] = cv::Vec3b( 255, 0, 255 );
    color[5] = cv::Vec3b( 0, 255, 255 );

    // Coordinate Mapper
    ICoordinateMapper* pCoordinateMapper;
    hResult = pSensor->get_CoordinateMapper( &pCoordinateMapper );
    if( FAILED( hResult ) ){
        std::cerr << "Error : IKinectSensor::get_CoordinateMapper()" << std::endl;
        return -1;
    }

    IFaceFrameSource* pFaceSource[BODY_COUNT];
    DWORD features = FaceFrameFeatures::FaceFrameFeatures_BoundingBoxInColorSpace
        | FaceFrameFeatures::FaceFrameFeatures_PointsInColorSpace
        | FaceFrameFeatures::FaceFrameFeatures_RotationOrientation
        | FaceFrameFeatures::FaceFrameFeatures_Happy
        | FaceFrameFeatures::FaceFrameFeatures_RightEyeClosed
        | FaceFrameFeatures::FaceFrameFeatures_LeftEyeClosed
        | FaceFrameFeatures::FaceFrameFeatures_MouthOpen
        | FaceFrameFeatures::FaceFrameFeatures_MouthMoved
        | FaceFrameFeatures::FaceFrameFeatures_LookingAway
        | FaceFrameFeatures::FaceFrameFeatures_Glasses
        | FaceFrameFeatures::FaceFrameFeatures_FaceEngagement;
    IFaceFrameReader* pFaceReader[BODY_COUNT];
    for( int count = 0; count < BODY_COUNT; count++ ){
        // Source
        hResult = CreateFaceFrameSource( pSensor, 0, features, &pFaceSource[count] );
        if( FAILED( hResult ) ){
            std::cerr << "Error : CreateFaceFrameSource" << std::endl;
            return -1;
        }

        // Reader ...
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2015-01-28 23:31:54 -0500 asked a question assign mat value int integer array

hi, i stucked into a little problem. I am unable to assign mat value into the integer array. below is my code : Mat arr = imread("image.jpg"); int histBuff[SIZE]; arr.get(0, 0, histBuff);

the problem is that class mat has no member get().

what should i do

2015-01-19 07:49:27 -0500 commented answer Interface Intel Realsense Camera

thanks Steven , i will modify it soon

2015-01-19 03:55:46 -0500 answered a question Interface Intel Realsense Camera

here is the working code of interfacing intel realsense camera SDK + opencv

https://github.com/dthepok/realsense

2015-01-19 03:53:39 -0500 commented question tip of tweezer

my application is to track the tip of these type of tweezer . for eye operation so that it will be helpful for the doctors.

2015-01-18 08:23:07 -0500 asked a question tip of tweezer

hi, can any one guide me how to find the tip of this twiser shown here by using depth image. image description image description

2015-01-18 08:16:45 -0500 commented question convert image into binary

i simply capture video frame from camera number 2 VideoCaptue cap(2); and it is giving me 1st image.

2015-01-18 02:19:41 -0500 asked a question convert image into binary

hi, i am trying to convert this image into binary. while converting i got this binary image . how can i make it pure white in hand part and else part in black. so that it should look exactly like this image.

thanks

2015-01-12 10:02:49 -0500 commented question c++ interface of cvCreateImageHeader(), cvSetData()

no, in depthImageData.plane[2] i am getting uv image. and in depthImageData[0] i am getting depth image. I want to ask how can i store its data in mat using cv::mat instead of iplimage pointer.

2015-01-12 10:00:36 -0500 commented question How to convert pxcimage into mat

sorry, i could not understand.

2015-01-11 11:19:10 -0500 commented question How to convert pxcimage into mat

i am not getting my answer thays why :)