Category: Introduction to OpenCV

Convolution is a mathematical operation on two functions f and g. The function f and g in this case are images, since an image is also a two dimensional function. Performing Convolution In order...

cvtColor Converts an image from one color space to another. Example Parameters src input image: 8-bit unsigned, 16-bit unsigned ( CV_16UC… ), or single-precision floating-point. dst output image of the same size and depth...

Step 1 Pr-requisites Python Numpy Matplotlib Download latest OpenCV release from sourceforge site and double-click to extract it. Step 2 Goto <your opencv extracted directory> like in my case it is E:\opencv\build\python\2.7\x86 folder (32...

Template matching is a technique in digital image processing for finding small parts of an image which match a template image. It can be used in manufacturing as a part of quality control, a...

cvCanny Implements the Canny algorithm for edge detection. Parameters of functions are as : edges Single-channel image to store the edges found by the function. threshold1 The first threshold. threshold2 The second threshold. aperture...

The cvFlip(, ) is used to flip image in OpenCV. Example

The following code shows, how to count the video frames in an AVI file. Example

To input a live stream from a camera we have to call cvCreateCameraCapture(). The argument which is passed in this function is a camera ID number as its argument.   Of course, this is...

Edge detection is the foundation practice with Computer Vision. To detect edges OpenCV has cvCanny function. Syntax Parameters : edges Single-channel image to store the edges found by the function threshold1 The first threshold...

Smoothing Image effectively reduces the information content of the image by convolving it with a Gaussian or other similar kernel function. OpenCV makes such convolutions exceptionally easy to do. We use cvSmooth function which...

To create a slider, we call cvCreateTrackbar() and indicate which window we would like the trackbar to appear in. The cvCreateTrackbar() has the following syntax. trackbarName  Name of the created trackbar. windowName  Name of...

In this we will see how to install OpenCV in Linux with Eclipse CDT plugin. Step 1 : Download the OpenCV library from http://sourceforge.net/projects/opencvlibrary/files/ Step 2 : extract filed to local Directory. Say /Downloads...

Consider the following sourcecode for reading an image from the local hard drive Example

Thresholding is an basic technique in which some objects are identified on image/videos with the help of colour values. Objects like A red can, green ball are easily identified with Thresholding on color values....

Playing a video with OpenCV is almost as easy as displaying a single picture. Th e only newissue we face is that we need some kind of loop to read each frame in sequence;...

This tutorial will explain step by step how to setup Visual Studio 2010 with Open CV 2.3 to start programming with this Open CV library. Step 1 Download OpenCV-2.3.exe from Open CV Downloads Step...