Server Side Programming Articles - Page 2363 of 2650

We know that when we solve any image related problem, we have to take a matrix. The matrix content will vary depending upon the image type - either it would be a binary image(0, 1), gray scale image(0-255) or RGB image(255 255 255). So if we want to add of two images then that means very simple we have to add respective two matrices. In OpenCV library, we have a function cv2.add() to add the images. But for image addition the size of the two images should be same. Addition of two images import cv2 # Readingour Image1 my_firstpic ... Read More

This is a method in image processing to do contrast adjustment using the image's histogram. Actually this method usually increases the global contrast of many images, especially when the usable data of the image is represented by close contrast values and through this adjustment, the intensities can be better distributed on the histogram and it allows for areas of lower local contrast to gain a higher contrast. OpenCV has a function to do this, cv2.equalizeHist() and its input is just grayscale image and output is our histogram equalized image. This technique is good when histogram of the image is confined ... Read More

magic methods that allow us to do some pretty neat tricks in object oriented programming. These methods are identified by a two underscores (__) used as prefix and suffix. As example, function as interceptors that are automatically called when certain conditions are met. In python __repr__ is a built-in function used to compute the "official" string representation of an object, while __str__ is a built-in function that computes the "informal" string representations of an object. Example Code Live Demo class String: # magic method to initiate object def __init__(self, string): ... Read More

In OpenCv module, we can use the function cv2.imread() to read an image. When inputting the image path, the image should be in the working directory or a full path of image should be given. cv2.IMREAD_COLOR − This function loads a color image and any transparency of image will be neglected. It is the default flag. cv2.IMREAD_GRAYSCALE − This function loads image in grayscale mode cv2.IMREAD_UNCHANGED − This function loads image as such including alpha channel Source Image Example import numpy as np import cv2 my_img = cv2.imread('C:/Users/TP/Desktop/poor/poverty_india.jpg', 0) cv2.imshow('image', my_img) k = cv2.waitKey(0) & 0xFF # wait ... Read More

The basic operations of OpenCV is to draw over images. The ability to add different geometric shapes just like lines, circles and rectangle etc. Often working with image analysis, we want to highlight a portion of the image, for example by adding a rectangle that defines that portion. Also as example an arrow to indicate something. cv2.line() − This function is used to draw line on an image. cv2.rectangle() − This function is used to draw rectangle on an image. cv2.circle() − This function is used to draw circle on an image. cv2.putText() − This function is used to write ... Read More

There is no such thing as a static class in C++. The closest approximation is a class that only contains static data members and static methods.Static data members in a class are shared by all the class objects as there is only one copy of them in the memory, regardless of the number of objects of the class. Static methods in a class can only access static data members, other static methods or any methods outside the class.A program that demonstrates static data members and static methods in a class in C++ is given as follows. Example #include ... Read More

An array arr[i] is interpreted as *(arr+i). Here, arr denotes the address of the first array element or the 0th index element. So *(arr+i) means the element is at i distance from the first element of the array. So, array index starts from 0 as initially i is 0 which means the first element of the array. In this article, we will see an example of C and C++ code to understand the reason why an array starts from index 0. Why Array Index Starts from Zero? The array index starts from zero as it provides better efficiency and ... Read More

To print the size of an array parameter in a function in C++, we will use the typeOf() operator. In this article, we have passed an array as an argument to the function. Our task is to print the size of this array in C++. Printing Size of Static Array Parameter When we pass an array as an argument of function in C++, it is considered as a pointer. The sizeOf() operator returns the size of the pointer, depending on the system(64-bit or 32-bit) rather than returning the size of the array. Here is a code example explaining this. ... Read More

C++ Static Object A static object is declared with the static keyword. The static objects are initialized only once and stored in the static storage area. The static objects are only destroyed when the program terminates i.e. they live until program termination. In this article, we will understand static object, their types, and their examples. Syntax of Static Object The syntax for declaring a static object is as follows: Animal cat; //object declaration static Animal dog; //static object declaration Types of Static Objects The static objects can be of two types, which are mentioned below: ... Read More

The static variables in C++ are defined using the static keyword. The static member variables in a class are shared by all the class objects as there is only one copy of them in memory, regardless of the number of objects of the class. All static data is initialized to zero when the first object is created, if no other initialization is present. In this article, we will understand the static member variables, their characteristics, and how static variables work in member functions with the help of example code. The characteristics of the static keyword are mentioned below: Characteristics ... Read More