muglikar's profile - activity

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

I tried fitting Hough circles but it's computationally expensive as the radius as well as centre of these circles is unk

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

@Witek: We're not allowed to use markers. @Chris: We're not allowed to share actual images. However, this drawn image is

@Witek: We're not allowed to use markers. @Chris: We're not allowed to share actual images. However, this drawn image is

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

Find hinge point or axis of rotation point? I have a problem at hand where I need to detect/predict the coordinates of t

OpenCV has image processing and machine learning modules.

Predicting lux values from images? I have several images (frames from a camera approx. 25,000 images) for which I have o

//get first column
cv::Mat one = your_mat.col(0);
// sort the first column and save indices in dst
cv::Mat1i idx;
cv::sortIdx(one, idx, cv::SORT_EVERY_COLUMN + cv::SORT_ASCENDING);
// now build your final matrix
cv::Mat result(your_mat.rows, your_mat.cols, your_mat.type());
for(int y = 0; y < your_mat.rows; y++){
   your_mat.row(idx(0,y)).copyTo(result.row(y)); //correction here
}

Program doesn't compile as lobglog.so not found, Glog compilation gives libglog.a What to do?

usr/bin/ld: warning: libglog.so.0, needed by /usr/local/lib/libopencv_sfm.so, not found (try using -rpath or -rpath-link) /usr/local/lib/libopencv_sfm.so: undefined reference to google::base::CheckOpMessageBuilder::CheckOpMessageBuilder(char const*)' Makefile:156: recipe for target 'brightnessDetector' failed /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::LogMessage::LogMessage(char const, int, int)' /usr/local/lib/libopencv_sfm.so: undefined reference to google::base::CheckOpMessageBuilder::~CheckOpMessageBuilder()' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::base::CheckOpMessageBuilder::ForVar2()' /usr/local/lib/libopencv_sfm.so: undefined reference to google::kLogSiteUninitialized' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::LogMessage::stream()' /usr/local/lib/libopencv_sfm.so: undefined reference to google::InitGoogleLogging(char const*)' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::LogMessageFatal::LogMessageFatal(char const, int, google::CheckOpString const&)' /usr/local/lib/libopencv_sfm.so: undefined reference to google::base::CheckOpMessageBuilder::NewString()' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::LogMessage::LogMessage(char const, int)' /usr/local/lib/libopencv_sfm.so: undefined reference to fLI::FLAGS_v' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::InitVLOG3__(int, int, char const, int)' /usr/local/lib/libopencv_sfm.so: undefined reference to google::LogMessageFatal::~LogMessageFatal()' /usr/local/lib/libopencv_sfm.so: undefined reference togoogle::LogMessage::~LogMessage()' /usr/local/lib/libopencv_sfm.so: undefined reference to `google::LogMessageFatal::LogMessageFatal(char const, int)' collect2: error: ld returned 1 exit status make: * [brightnessDetector] Error 1 20:12:17: The process "/usr/bin/make" exited with code 2.

Ok, any nudging link for the said method documentation @StevenPuttemans. Actually, I've begun GPU porting for my entire project and this precisely is my bottle neck roadblocking pain point!

@Guyygarty, that seems exciting but why are you calling yourself 'somebody'? :) It'd be a pleasure if I could get to see how you did it. And btw, I'm not in this pursuit only for gains from this exact finding contours thing, but the overall gains from all the functions. :)

Surprisingly, findContours() doesn't give any compilation error even when the input is a GpuMat. I'm curious why.

Does findContours work on both cv::Mat and cv::cuda::GpuMat, @StevenPuttemans ?

There are several OpenCV CPU functions which have a direct (GPU) Cuda counterpart like cv::cvtColor & cv::cuda::cvtColor.

But I found no direct or indirect (GPU) Cuda counterpart for cv::findContours CPU.

Isn't there a OpenCV Cuda function similar to findContours? Or does findContours work on both cv::Mat and cv::cuda::GpuMat?

@mary Could you post the link to the C++ code please?

Is there no way to run traincascade on gpu yet?

Did you find any solution to this problem @lordtchofo ?

How to draw inscribed rectangle in fish eye corrected image using opencv?

Original image:

This is the fish eye corrected image:

This is what I need to crop the image: Either the 4 corner points of the rectangle or the midpoints of the sides.

Final manually corrected image:

And what does it exactly mean?

Its a friend's poblem. Has anyone tried doing mesh based image warping with OpenCV? If yes, how to do it? Only closest option is remap function, which is hardly anything if you want to do something like http://www.projectwoman.com/uploaded_images/bradley16_fig02-704998.jpg

A few weeks ago I got a request from a Marketing Research Executive Mr. Dyson D’Souza, who works for Packt Publishing for reviewing a book titled “Instant OpenCV Starter“. He approached me seeing my LinkedIn profile, which you may visit via the widget on the right sidebar fo this page. I was quite delighted by the opportunity. Here's my review of the book that can be bought here:

Overall this book is an excellent starting point for beginners to start programming in Image Processing and Computer Vision using OpenCV. This book will surely generate a lot of interest in students who I'm quite sure will get hooked to the enormous possibilities presented by the OpenCV library.

Please read my review here on my Website: Review of Packt Publishing’s ‘Instant OpenCV Starter’ book

Hope you find the review useful.

This link says:

anchor – anchor point; default value Point(-1,-1) means that the anchor is at the kernel center.

I could change this value to (0,0) and it worked with the image slightly shifted to top left. But it did not work for any other value i.e. it gives Unhandled Exception (Unhandled exception at 0x75d8d36f in testCV.exe: Microsoft C++ exception: cv::Exception at memory location 0x0020ee6c..) for any other value of the coordinates of the anchor point. So, I'm a bit unclear about what does it exactly mean?

blur(src, dst, Size(i, i), Point( 2, 2 )); // The point takes on (0,0) & (-1,-1) values for now. Why???