ambikav's profile - activity

Here are the two matrices - Cam1 = [1000 0 500 0 0 1000 500

Here are the two matrices - Cam1 = [1000 0 500 0 0 1000 500

opencv triangulatePoints() giving NaN values I'm trying to implement standard Structure from Motion code but the triangu

System information (version)

•OpenCV => 3.2 •Operating System / Platform =>Windows 64 Bit •Compiler => MinGW (CodeBlocks)

Detailed description

Downloaded and extracted openCV 3.2 and opencv_contrib 3.2 version. Used Cmake GUI to go through standard steps. It configures and generates without error. Then while building openCV.cbp project in CodeBlocks I get the following error in stitching module -

opencv2/xfeatures2d/cuda.hpp no such file or directory

Steps to reproduce

Note: if I build openCV 3.2 on its own (i.e. without the extra modules) it builds perfectly fine.

Any fix for this issue?

Hi

I did try the MJPG encoded avi files but even that did not work. I used ffmpeg command line tool to do that. But still not able to read the file.

Are there particular instructions for ffmpeg tool that you can refer me to?

extern "C"

{

void JNICALL Java_com_example_ambikav_opencvvideo_MainActivity_myfun(

JNIEnv *env, jobject instance, jstring path) {

nPath = env->GetStringUTFChars(path, NULL);

LOGD("path: %s \n",nPath);

cv::VideoCapture videoCapture(nPath);

if(videoCapture.isOpened()){

LOGD("yes");

}

else{

LOGD("no");

extern "C" { void JNICALL Java_com_example_ambikav_opencvvideo_MainActivity_myfun( JNIEnv *env, jobject instance, jstring path) { nPath = env->GetStringUTFChars(path, NULL); LOGD("path: %s \n",nPath);

cv::VideoCapture videoCapture(nPath);
if(videoCapture.isOpened()){
    LOGD("yes");
}
else{
    LOGD("no");

I'm trying to use VideoCapture() in an android application. The app makes a JNI call to the cpp file which has the videocapture() call and passes it a video path.

• I have provided the storage read and write permissions.
• The path is also in correct format like (/storage/emulated/0/filename.avi)
• The video file that I put into my device is first encoded as mjpeg and then as avi using ffmpeg on my PC.

Still I get false result when I check VideoCapture.isopened().

Any suggestions to fix this issue?

Great. Thanks!

In Matlab following can be done -

Matrix=startVal:endVal; which results in a row vector with first element of startVal, incremented by one each time and last value being endVal.

Is there a similar way to create a 1D Mat in openCV?

Thanks for clarifying this!

I'm starting to work with estimateRigidTransform(). It allows two types of inputs - Vector or mat of 2D points OR two input images. It is mentioned in docs that some feature points are computed in case the inputs are images. What are these features?