make failed from source code
[ 63%] Building CXX object modules/text/CMakeFiles/opencv_text.dir/src/ocr_beamsearch_decoder.cpp.o In file included from...
View ArticleTime Consuming by cvEigenDecomposite
Dears , I am trying to implement face recognition using pca , when I user the function "cvEigenDecomposite" to project test img in face space , I measured the time consuming by this function in...
View ArticleImgproc.matchTemplate() API returns void. IS there any way to know that a...
A rectangle is drawn irrespective of the template found or not. How can I know taht a valid match for the template has been found?
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Hardly ever Lie Alert At Night Once again
This kind of feature intended for the Korean F490 is undoubtedly something I really enjoy. Although anger ultimately caused his downfall. Get a program which will best suit you.Info is segregated and...
View ArticleWhy doesn't the inRange() function detect this little red colored blob in...
I created the following `50px by 50px` image in Adobe PS, and the red circle has an `HSV` value of `H=5, S=90, V=80`, where the `HSV` scale in PS is `H=0-360, S=0-100, V=0-100`. The `HSV` scale in...
View Articleeigenvalues
Hello at all!!! I have a simply question. I have a Mat after read image with opencv. Now, how can I calculate eigenvalues and its eigenvectors? Could you show me an example? Thanks you so much
View ArticleIs ICR (Intelligent character Recognition ) is possible using opencv 2.*
Hi, i am trying to create ICR but i am not sure whether opencv 2.4.* versions will support those features. if any suggestions about icr using opencv please let me know. thankyou
View ArticleRTrees::setCVFolds() causes EXEC_BAD_ACCESS
Hi all, I'm using RTrees, the new OpenCV 3.0.0 implementation. When I set the number of k-folds used for the training, I have a EXEC_BAD_ACCESS. Any idea why ?
View ArticleMake a 3D mat from a std::vector of 2D mat
Hi, I have a std vector of several 2D Mat `std::vector matList`, and instead of accessing the pixel values in the third dimension by using, e.g., `matList.at(k).at(i, j)`, i'd like to have a 3D mat so...
View ArticleDisplaying multiple images
Hi All, i tried to update an outdated [sample code on opencv/wiki](https://github.com/Itseez/opencv/wiki/DisplayManyImages) The changes I have made up to now are as follows. #include #include using...
View ArticleDocumentation for opencv_annotation
Can anyone explain how the opencv_annotation tool works. I can't find any documentation. I have it loading the images, but I can't apply my selection or select multiple regions
View ArticleHow to cut image to smaller pieces?
I need to cut image in half and each of them save as different one. For example I have image in grayscale and I try to do it like this: halfImg[0] = Mat(greyimg, Rect(0, 0, 163, 93)).clone();...
View ArticleHow to get OpenCV to store HSV in Matlab notation [0-1]?
I am working on transferring a working Matlab project to C++/OpenCV, but I'm encountering a problem while converting from BGR to HSV, since the project is intended to work with small numbers that...
View Articlehow to use videostab.cpp in a swift program
I have successfully installed openCV on my swift project using a bridging header and objective c wrapper to change the color scate of an image from rgb to gray scale. I'm attempting to implement video...
View ArticlecalcOpticalFlowSF does not exist
Hi, I just switched to opencv 3 and must see that the simple flow algorithm calcOpticalFlowSF does not exist. I cannot find it in the sources and it is commented out in the samples. However I find it...
View ArticleDetect face with smartphone in front of it …
Hello folks, for my studies project, I'm looking for a way to detect a person/face with a (photographing) smartphone (with maybe hands on) in front of it. Do you know of any haarcascade-classifiers...
View ArticleTriangle detection - Canny failing on corner
Hi I'm trying to detect a triangle however approxPolyDP fails because length(approx) != 3 approx = cv2.approxPolyDP(.....) I think its because the Canny algortihm somehow cannot find lower right virtex...
View Article[Python, windows 10] Reducing VideoCapture latency from UDP
**Purpose:** capturing real time (no latency) UDP video stream from Raspberry Pi on windows 10 + win python. **Currently:** *VideoCapture(“udp:/[IP]:[PORT]”)* works well. However, it seems to buffer...
View ArticleEnable Auto Exposure using code
I've had trouble with this before hen trying to disable the Auto Exposure on my webcam, I managed to do it by setting the CV_CAP_PROP_EXPOSURE value which automatically disabled the Auto Exposure. I'd...
View ArticleHow to start using houghlines in lane detection / tracking
Does anyone know the concept of using HoughLines in OpenCV for line detection? I am just starting learn opencv with its tutorials but still confused about how to use houghlines
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