This subject was well covered on OpenCV 2 Computer Vision Application Programming Cookbook: Chapter 2 shows a few reduction operations, one of them demonstrated here in C++ and later in Python: #include <iostream> #include <vector> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> void colorReduce(cv::Mat& image, int div=64) { int nl = image.rows; // number of lines int nc … Read more
This is using the :hover pseudoelement in CSS3. HTML: <div id=”wrapper”> <img src=”http://placehold.it/300×200″ class=”hover” /> <p class=”text”>text</p> </div> CSS: #wrapper .text { position:relative; bottom:30px; left:0px; visibility:hidden; } #wrapper:hover .text { visibility:visible; } Demo HERE. This instead is a way of achieving the same result by using jquery: HTML: <div id=”wrapper”> <img src=”http://placehold.it/300×200″ class=”hover” /> <p … Read more
I adapted some parts to the answer of Milo from matplotlib import pyplot from math import cos, sin, atan class Neuron(): def __init__(self, x, y): self.x = x self.y = y def draw(self, neuron_radius): circle = pyplot.Circle((self.x, self.y), radius=neuron_radius, fill=False) pyplot.gca().add_patch(circle) class Layer(): def __init__(self, network, number_of_neurons, number_of_neurons_in_widest_layer): self.vertical_distance_between_layers = 6 self.horizontal_distance_between_neurons = 2 self.neuron_radius … Read more
To get the alpha layer of an RGBA image all you need to do is: red, green, blue, alpha = img.split() or alpha = img.split()[-1] And there is a method to set the alpha layer: img.putalpha(alpha) The transparency key is only used to define the transparency index in the palette mode (P). If you want … Read more
The standard Go library does not provide primitive drawing or painting capabilities. What it provides is models for colors (image/color package) and an Image interface with several implementations (image package). The blog post The Go Image package is a good introduction to this. It also provides a capability to combine images (e.g. draw them on … Read more
Since no one has posted a complete OpenCV solution, here’s a simple approach Obtain binary image. Load the image, convert to grayscale, and Otsu’s threshold Remove horizontal lines. We create a horizontal shaped kernel with cv2.getStructuringElement() then find contours and remove the lines with cv2.drawContours() Remove vertical lines. We do the same operation but with … Read more
For Chrome and Safari you can add the following in your CSS: @media print { * {-webkit-print-color-adjust:exact;} } For other web browsers unfortunately it’s up to the user to manually select the option to print background images (e.g. for users with IE 9, 10 and 11 they have to click on the cog icon -> … Read more