Is it possible to calibrate camera with autofocus?
I want to calibrate my iPhone 6 plus camera. But I am aware of it having the autofocus feature. So, is it actually possible to calibrate it (or any camera with the autofocus feature)?
View Articletextdetection sample producing errors
i am trying o run the file textdetection.cpp file present[ here ](https://github.com/opencv/opencv_contrib/tree/master/modules/text/samples) .. i tried it with different images but every time an...
View Articlesaving TIFF tags in header?
When saving an OpenCV mat, is it possible to add TIFF tags to the header? I need to store pixel dimensions in the image header. Thanks!
View Articlecrack detect red line opencv
i want to make a decision making process of detection of biscuit crack so i used the hough transform for detection of crack. here is the code. It means counting the red pixels,if present then say as...
View Articlecrack detection
Hello there i used the thresolding techniques(thresold TOZERO) of my biscuit image and used canny edge detection. After then i used hough transform...
View Articlehttp://www.supplements4us.com/exoslim/
when your body needs it.Exoslim Always keep intensity and refrain from quitting in any weight loss plan. You will surely suffer setbacks or give in to temptation, whether on your diet or exercise...
View ArticleHow to integrate OpenCV in a C++ project build by gradle
I set up a hello world project [here](https://bitbucket.org/BenNG/hello-cpp/src/11e229362b4788afb24d99f16f40a8c93c496770?at=master) which is basically a copy/paste of the samples from the gradle...
View Articlegl_FragColor get different color depends on andorid device
In my app I'm doing some image pixels manipulations. My code based on [THIS][1] example. The only change that I've made is to change the `FRAGMENT_SHADER` to a grayscale and it looks like this:...
View ArticleHow to save and load Matx from a file?
When trying to save a `cv::Matx` to a file using FileStorage, openCV throws some errors which say saving a Matx is not yet implemented. A workaround is to cast the Matx to a `cv::Mat` when writing:...
View ArticleBrisk & opencv 2.4.8 (or more)
Hi, I have decided to use binary feature matching in an application, and after reading here and there, I finally decided to use ORB/ORB or BRISK/BRISK (and maybe FREAKS descriptor in further step) I...
View ArticleMat rotation center
Hi, I'm rotating the 10x1 image by specifying center at 5,0: [255, 255, 255, 255, 255, 255, 255, 255, 255, 255] int size = 10; Mat test = Mat::zeros(Size(size, 1), CV_8U); line(test, Point(0, 0),...
View ArticleObject detection using a 3D-TOF camera
Hello everyone, I am trying to connect a 3D TOF camera using opencv on Visual Studio. This camera generates four output streams as mentioned below. - Intensity - Confidence - Range/Depth data - 3D PCL...
View Articledo i need to equalizehist for both training and capturing?
Hi everyone, currently i am doing equalizeimg on the grabbed images from webcam, do i also need to apply this to images i am training on? Thanks a lot
View Articlemultiple windows are opening with arbitrary name ..even i had gave named to...
#include "opencv2/highgui/highgui.hpp" #include using namespace cv; using namespace std; int main() { VideoCapture cap(0); if ( !cap.isOpened() ) namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); while(1) {...
View ArticleBag of Word BOWTrainer clustering for binary descriptors
**Context:** As you might be aware, the current OpenCV BOW implementation can only function as expected with float descriptors (like SIFT and SURF) since the current clustering method is based on...
View ArticleFincontours unexpected result
Hi, I have a binary image, and I though to use findconrours such it may help in feature extraction. After implementing findcontours, when I print len(contours), the answer was 132! My expectation...
View Articleretina blood vessel(edge) width
Hi, I am new with opencv and computer vision but I can work with c++. I want to get the retina blood vessel width so I did canny edge detection. I have an image with edges but not sure how to get the...
View ArticleCropping a face and removing the background?
After some research I found that OpenCV is going to by my friend all my way through finishing this project. I want to crop a human's face from an image, remove the background and save the result. Since...
View Articledestroywindow and destroyallwindows not working.
Mac, Python 3.5.2 destroywindow and destroyallwindows cannot close the windows created by the program. I found something saying I need to use waitkey afterwards but I can't get it to work. The...
View ArticleRead a gray scale or monochrome image with alpha channel
Repeating a [question](http://stackoverflow.com/questions/39503233/opencv-read-a-gray-scale-or-monochrome-image-with-alpha-channel) from stackoverflow. How can I read a gray scale image in OpenCV with...
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