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How to crop an image in OpenCV using Python
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this code crop an image from x=0,y=0 position to h=100,w=200
import numpy as np
import cv2
image = cv2.imread('download.jpg')
y=0
x=0
h=100
w=200
crop = image[y:y+h, x:x+w]
cv2.imshow('Image', crop)
cv2.waitKey(0)
...
C++: const reference, before vs after type-specifier
...& (and const T*):
const T& is the style used in Stroustrup's The C++ Programming Language book.
const T& is the style used in the C++ standard itself.
const T* is the style used in K&R's The C Programming Language book.
const T* is the style used in the C standard.
Due to the above...
What is the difference between an int and a long in C++?
...s whereas an int was 32 bits. This article covers the rules for the Intel C++ compiler on variable platforms. To summarize:
OS arch size
Windows IA-32 4 bytes
Windows Intel 64 4 bytes
Windows IA-64 4 bytes
Linux IA-32 4 byte...
Where do I find the current C or C++ standard documents?
... standard
As of 1st September 2014, the best locations by price for C and C++ standards documents in PDF are:
C++17 – ISO/IEC 14882:2017: $116 from ansi.org
C++14 – ISO/IEC 14882:2014: $90 NZD (about $60 US) from Standards New Zealand
C++11 – ISO/IEC 14882:2011: $60 from ansi.org $60 from T...
Forward declaration of nested types/classes in C++
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You can't do it, it's a hole in the C++ language. You'll have to un-nest at least one of the nested classes.
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Simple example of threading in C++
...someone post a simple example of starting two (Object Oriented) threads in C++.
7 Answers
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How do you easily horizontally center a using CSS? [duplicate]
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In most browsers this will work:
div.centre {
width: 200px;
display: block;
background-color: #eee;
margin-left: auto;
margin-right: auto;
}
<div class="centre">Some Text</div>
In IE6 you will need to add another outer div:
div.layout {
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Command line progress bar in Java
...00, 1000);
[**********] 100%
Test with for loop
for (int i = 0; i <= 200; i = i + 20) {
progressPercentage(i, 200);
try {
Thread.sleep(500);
} catch (Exception e) {
}
}
The method can be easily modified:
public static void progressPercentage(int remain, int total) {
...
How to initialize a vector in C++ [duplicate]
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With the new C++ standard (may need special flags to be enabled on your compiler) you can simply do:
std::vector<int> v { 34,23 };
// or
// std::vector<int> v = { 34,23 };
Or even:
std::vector<int> v(2);
v = { 34,23 ...
How to access parent scope from within a custom directive *with own scope* in AngularJS?
...ml
<select ng-model="selectedItems" multiple="multiple" style="height: 200px; width: 250px;" ng-change="selectedItemsChanged({selectedItems:selectedItems})" ng-options="item.id as item.name group by item.model for item in items | orderBy:'name'">
<option>--</option>
</select&...