What are additions in OpenCV4Tegra?
Hello. I'm studying OpenCV and running examples on an Nvidia Jetson Tk1 dev board. It has the Tegra K1 SoC. Nvidia's SDK comes with its own distr of OpenCV4Tegra. It is actually 2.4.10 with, as I...
View ArticleTelephoto lens calibration
Hi Everyone, I'm working through lens calibration and I've been getting results that look fairly accurate with wider lenses. I've been using the following sample:...
View Articleimread, command line arguments in VS13
I'm trying to run this code in VS13 that uses command line argument I'm following this method but its nt working. Solution Explorer Properties Debugging Command Arguments "D:/Images/image1.jpeg"...
View ArticleHow do I use OpenCV-3.0.0-android-sdk-1.zip with Android Studio 1.3.1?
As Android studio and opencv4android evolve, tutorials on how to use them together are not current anymore. How do I use OpenCV-3.0.0-android-sdk-1.zip with Android Studio 1.3.1?
View Articlestitcher class functionality
Hi, i'm looking for working steps and explanation of stitcher class. how createdefault() , stitch() , status() and other methods actually work. I studied some basic explanation of stitching pipeline...
View Articlehow to detect numbers written on a speed sign
i want to use opencv for detecting the speed signs on the road, and extract the number written on the sign. is there any library that does task? note: i know how to make image matching, but i do not...
View ArticleFacial Recognition Speed
Hi guys, I'm a bit of a noob with facial recognition, but have a question I was hoping someone could answer regarding speed. If we take a database of 100,000 users, each with 1 photo (forward facing);...
View ArticleDo I have to worry about borders when I resize a large image in blocks?
Hi, If I first divide an image into 4 (2x2) blocks, resize them by 50% in each dimension separately and put them back together, will the image be different from an image directed resized from the...
View Articleopencv 3.0 with contrib installation guide
Hi there, I've tried a few different methods in order to install opencv 3.0 gold WITH the opencv_contrib modules (I would like to use the tracking ones in particular), none of which seem to work. Can...
View ArticleProblem writing video files
Hy Guys! I have a C++ project in Eclipse using the OpenCV library. I'm using the code below and a mp4 file for testing. Compilation runs fine, but when I run the program i get an error. I've tried...
View ArticlecontourArea() unit ??
Hi, I am using contourArea() to get the area of a binary object My question: does it return the number of pixels ?? Or if area then what is the unit of it I need to convert the area into Mm2 and report...
View Articlecuda support in standard libraries for OpenCV 3.0.0
I've tried to create a small sample application that calls a few cuda functions. The cv::cuda::getCudaEnabledDeviceCount() seems to be available in the import library for the opencv_world_300.dll but...
View ArticleHow to find brightness of given area
There are (combinations of) OpenCV functions/methods to find the difference between two frames of a video. After finding such areas I would then like to know the rate of change of brightness for those...
View ArticlecompareHist with HISTCMP_CORREL
I'm evaluating compareHist() and when I compare a 'flat' histogram with a single spike, the correlation value is 1.0! This is obviously wrong (by hand I get zero divided by zero but it should be...
View Articleefficiency of Filter2D and sepFilter2D
Theoretically, the sepFilter is faster than Filter. But, the results in my tests show that the Filter2D is about 4 times faster than the sepFilter2D. I tested the two functions in CPU,with the same...
View Articlelength of two or three point vectors
Hello, I have an outputs of 2 and 3 vectors from a centroid in images as below. Other than a manual eucladian method, is there any other method that can be used to direct measure the length between...
View ArticleFlann against a database of images
Hi, I am trying to build a image recognition system where users upload images to a web portal and then they can scan that image in a mobile phone and upon successful recognition, mobile displays some...
View ArticleSVM.load() module in python opencv3
Hi! Recently I've tried to rewrite my code from opecv2 to opecv3 and realized, that in opencv3 the SVM.load() module has gone. In my case I setup svn by: > svm = cv2.ml.SVM_create() then I set...
View ArticleIs this the software for me?
Hi, I'm working at a youth center, and i'm always looking for some kind of science project. Now i got an idea that i would like to present for the kids, and its about facial recognition. I would like...
View ArticleTickMeter class removal and how to replace it?
Hi. I know there have already been questions like that, but they remain unanswered. I would like to know, why TickMeter class was removed. I know it's used in samples however. If there was no good...
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