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I am looking for an OpenCV function that can find connected components and perform a few tasks on them ( like getting the number of pixels, contour, list of pixels in the object etc.. )
Is there a function of OpenCV (C++) that is similar to MatLab's regionprops ?
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A connected component is a set of connected pixels that share a specific property, V. Two pixels, p and q, are connected if there is a path from p to q of pixels with property V. A path is an ordered sequence of pixels such that any two adjacent pixels in the sequence are neighbors.
Applying Connected Component Labeling in Python: Connected Component Labeling can be applied using the cv2. connectedComponents() function in OpenCV. The function is defined so as to show the original image and the image after Connected Component Labeling. The input the the function is the path to the original image.
Connected components, in a 2D image, are clusters of pixels with the same value, which are connected to each other through either 4-pixel, or 8-pixel connectivity.
Starting from version 3.0, OpenCV has connectedComponents function.
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Have a look at the cvFindContours function. It's very versatile -- it can find both interior and exterior contours, and return the results in a variety of formats (e.g. flat list vs. tree structure). Once you have the contours, functions like cvContourArea allow you to determine basic properties of the connected component corresponding to a particular contour.
If you prefer to use the newer C++ interface (as opposed to the older C-style interface I described above), then the function names are similar.
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