Usually, image processing software will provide blur filter to make images blur.There are many algorithms to implement blur, one of them is called Gaussian Blur Algorithm. It utilizes Gaussian distribution to process images.This article is to introduce Gaussian Blur algorithm, you will find this is a simple algorithm. In fact, it is a kind of data smoothing which can be used in many situations.1. Gaussian Blur theoryThe so called blur can be understood as taking a pixel as the average value of its surrounding pixels.On the above graph, 2 is the center point, the surrounding points are 1.The ce...

The design of JavaScript is not so sophisticated. It's very easy for us to make mistakes if we are not very careful when using JavaScript. For example, to check the existence of JavaScript object.Now we want to check whether a global object myObj exists or not, if it doesn't exist, we declare it. The pseudo code for this is :if(myObj not exist){ declare myObj;}You may think it's very easy to write the code. In fact, it is much more difficult than we may think. Juriy Zaytsev says there are more than 50 ways to check whether a JavaScript object exist or not. Only if you are very clear about the ...

Image Source: UnsplashWeb scraping is a technique used to extract large amounts of data from websites and save onto your computer in a database or time table format. There are many reasons businesses would use this information for lead generation, SEO, or to better understand their customers. However, you can do a lot of fun projects in your free time that doesn’t have to be associated with work or a company. Before you start using your programming skills to find and extract information, it’s essential to know how to find a reputable guide for your web scraping project. H...

When we try to install wxPython lib on Ubuntu system to do software GUI development,most of time we may meet some installation and lib dependency problems. For the latest Ubuntu version, the problems still happen. Below are some common problems which happened frequently and their solution:---------------------------------------------------------------------------------------------------------------Problem [1]: Install wxPython on Ubuntu 20.04 fail because of dependency package Gtk is not installed.Error Message:No package 'gtk+-3.0' found Package gthread-2.0 was not found in the pkg-config sea...

Sometimes there would be a submodule or some submodules within one git repository, in some cases the submodule may be out of sync with the checkout state as some files in submodule may be changed unexpectedly. How to reset the submodule to be the same as the original checkout state?Let's take an example that we have a git repository A and there is a submodule called ruby-gems under it. Assuming the submodule at remote origin has commit a.And on our local environment, the repository A has a latest commit of the submodule which causes some diff difference.$ git diffdiff --git a/web-api/ruby-gems...

Nowadays microservice is very popular among companies with the increasing complexity of systems. The goal is to make each microservice to handle one specific job and handle it well. This normally would provide the benefit of maintaining the service easily and isolating errors and making the service more reliable and scalable.The benefits of adopting microservice are obvious.Maintainability. Decouple functions so that each function can be maintained separately which reduces the risk of issue caused by bug in other code which is not related to this function at all. It can be easily maintained by...

There is some case where some of the struct in GoLang which is not meant to be copied. For example, sometimes a global configuration which should have only one version passed around the whole application and should not be copied and modified.In GoLang, there is no intuitive solution on preventing copying of struct. But there is still some way which can be leveraged to help prevent this while developing the code. The trick is to define some struct implementing sync.Locker interface and has this struct embedded in any struct not meant to be copied.// noCopy may be embedded into structs which mus...

To stay in demand, a top-level design agency must be aware of the current trends. This will improve their professional skills, help them to keep an eye on the latest events, and offer the clients relevant models that will increase conversion, website traffic, and customer loyalty. Read on to find out which nine web design trends are popular in 2020.UL animationThere is a stereotype that it makes no sense to develop a complex, high-quality animation because it will not be supported by devices with low specs. This myth was successfully refuted by new equipment manufacturers such as GreenSock. Th...