Instant OpenCV Starter by Jayneil Dalal, Sohil Patel

By Jayneil Dalal, Sohil Patel

Get all started with OpenCV utilizing useful, hands-on initiatives with this booklet and ebook

Overview

  • Learn anything new straight away! a brief, quick, concentrated advisor providing fast results
  • Step by way of step set up of OpenCV in home windows and Linux
  • Examples and code in line with real-life implementation of OpenCV to assist the reader comprehend the significance of this technology
  • Codes and algorithms with distinctive explanations

In Detail

In the electronic age of photo and video sharing, the necessity for desktop imaginative and prescient is at an all time excessive. have a look round you and you'll see that computing device imaginative and prescient is being carried out all over the place. it's getting used in autos, social networking websites, and in quite a few different fields resembling scientific technology, robotics, safeguard, domestic automation, and so forth. this can be the place OpenCV comes into the image. OpenCV is the world's preferred open resource computing device imaginative and prescient library with greater than 500 optimized algorithms for picture and video analysis.

Instant OpenCV Starter is a pragmatic, hands-on consultant to help you comprehend the significance of machine imaginative and prescient in actual existence in addition to some of the various capabilities of the OpenCV library through small programming tasks with uncomplicated, exact explanations.

This publication is helping newbies quick examine OpenCV to enforce a variety of computing device imaginative and prescient comparable initiatives. you are going to first comprehend the significance and functions of laptop imaginative and prescient in actual existence. After that, you are going to find out how to manage OpenCV, by means of a chain of sensible programming initiatives to get you conversant in numerous capabilities within the OpenCV library.

The publication also will specialize in using OpenCV in a couple of remarkable initiatives similar to detecting obstacles in a given snapshot, hiding a picture in a distinct photograph to transmit mystery details (known as picture steganography) in addition to do real-time video processing.

Instant OpenCV Starter will educate you the way to put in and use the OpenCV library for numerous easy desktop imaginative and prescient comparable tasks.

What you'll research from this book

  • Discover the fundamentals of OpenCV
  • Install OpenCV in home windows and Linux
  • Learn trivial OpenCV initiatives corresponding to studying, exhibiting, cropping, and saving images
  • Understand pixel manipulation
  • Apply snapshot conversions
  • Explore photo and video processing
  • Handle troubleshooting

Approach

Get to grips with a brand new expertise, comprehend what it really is and what it might do for you, after which get to paintings with an important positive aspects and tasks.A functional, speedy, and hands-on consultant for Python builders and hobbyists who are looking to start with desktop imaginative and prescient with OpenCV.

Who this booklet is written for

This booklet is superb for builders, hobbyists, and scholars new to machine imaginative and prescient who're seeking to get a great grounding in the best way to use the OpenCV library. It’s assumed that you'll have a few easy event in C/C++ programming.

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Sample text

Void getOriginalImages(Mat& aStegedImage, Mat& aFrontImage, Mat& aHiddenImage) This is our function which will help us obtain the carrier image and the hidden image from the steganograph image and it takes three arguments. The first argument is the matrix that contains the steganograph image. The second one is the matrix containing the image in which we have hidden our desired image. The third argument is the matrix containing the image that is desired or hidden. type(), Scalar(0xF0, 0xF0, 0xF0)); 35 Instant OpenCV Starter Unlike in the previous case, here we initialize each element of the front_mask matrix with the value 0x0F or 11110000 in binary.

Jpg and stored it in the image variable. Replace in the preceding command with the location of that picture on your PC. namedWindow( "Display window", CV_WINDOW_AUTOSIZE ); We now need a window to display our image. So, we use the above function to do the same. This function takes two parameters, out of which the first one is the name of the window. In our case, we would like to name our window Display Window. The second parameter is optional, but it resizes the window based on the size of the image so that the image is not cropped.

So, only the portions that need further explanation have been discussed, as follows: Canny(gray edge, edgeThresh, edgeThresh*3, 3); 37 Instant OpenCV Starter We have used the Canny function in OpenCV to implement the Canny algorithm for edge detection. This function accepts usually five parameters, but the last one is optional. The first parameter is the matrix containing the source image while the second is the matrix in which we want to store the resulting output. The third and fourth parameters are threshold 1 and threshold 2 respectively.

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