Use openCV to determine html tag.
Given UI of a webpage built using Bootstrap image . How to identify the bootstrap elements present in the UI.
View ArticleHow feature matching works in opencv?
I have the (x,y) location of points in two images now I want to perform keypoint matching
View ArticleImage Retrieval through fisher vectors: why my implementation works SO BAD?
I'm trying to implement a Content Based Image Retrieval system for small image-dataset. By now, I'm using 1k images (40 categories) from [Caltech101][1]. This is the system workflow: 1. For each image...
View Articlegetting frame number from Mat
Is it possible to get a frame number from a Mat object? From a VideoCapture object it would be cap.get(CAP_PROP_POS_FRAMES) is there a function for getting the current frame number from the Mat
View ArticleBuild opencv 3.1.0 extra module for android on Mac?
Hi, I'm new to OpenCV and want to use SIFT and SURF features detector on Android Studio that is available on opencv_contrib. I'm using these tutorial (with modification) to build opencv 3.1.0 extra...
View ArticleUnable to convert color image to grayscale in android opencv
This is the part of code which is not working good. I know this question has been asked earlier, but i have done everything i could do but still couldn't figure out the reason. This is the portion of...
View ArticleIs it possible to overlay a transparent image over a live camera view, such...
The transparent image I want to overlay is just the boundary of a polygon in black color, the rest of the image is transparent. Like this:  Using...
View ArticleGetting openCV error: Assertion Failed
I'm using opencv 3.1 in RaspberryPi 3. I,m trying to run the following Hough Circle detection algorithm #! /usr/bin/python import numpy as np import cv2 from cv2 import cv VInstance =...
View ArticleShape Distance Logic
I would like to ask the logic behind the shape distance provided in opencv 3.1 as I am confused by the results of using shape distance when comparing duplicated images. I used the shape distance...
View ArticleFind a rectangle and crop the area
Hello, how I can find a rectangle in CameraBridgeViewBase (Android), draw an outline on it and save this area? I research a lot but did not find anything very relevant. Thanks.
View ArticleMessage displayed at the end of execution
Greetings. I am creating an application with OpenCV and Qt. My program works correctly, but when execution completes shown the following message on the console:...
View ArticleHow to add a face database in opencv face recognition andorid app?
I am new to android and opencv. i go through the opencv mobile app for face recogniton which is available in play store(...
View Articleassigning ID to individual blobs
Please assist. Is there any way I can assign detected blobs ids such that I can then refer to each from any where else in my code. say I want the first blob detected to have an ID = 001, second =002,...
View Articleoptic flow and video writer
Hi All, I'm using Optic flow (motempl) for motion detection. I'm trying to write a video if motion is detected, but i think i'm doing it wrong. I sort of integrated it (not perfectly i know) in that it...
View ArticleOpenCV Structure from Motion Reprojection Issue
I am currently facing an issue with my Structure from Motion program based on OpenCv. I'm gonna try to depict you what it does, and what it is supposed to do. This program lies on the classic...
View Articlehow to retrieve all coordinates of pixels of specific colour in an image.
Hello, I'm new to OpenCV and I'm trying to retrieve the coordinates (preferably in numpy array) of specific colour in my image. I have four different colours in the image and want extract all the four...
View ArticleWhat is the best method to match face features against a database?
## The challenge I'm trying to replicate the experience from this campaign, but in realtime: - http://www.gettyendlesspossibilities.com/ ## What I have now - I'm able to detect faces and (somewhat...
View Articlehow can i train SVM
I am new to this. I am trying to do machine learning on vehicle color recognition system. Can i know some useful links to learn about SVM training? I have watched some videos and red some stuff about...
View Articlevideo writer does not allow a string variable ?
Video writer gives me empty containers messages and such on mac if i do not specify a constant literal myself, i.e. "test". If i give it a string variable, it won't write. This is making it difficult...
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