Adding user Sign-in of AWS Cognito to Android app is relatively easy, so this post would be short and easy to follow. Before adding authentication to the project, we should add some prerequisites to our Android project. Basically, there are three prerequisites for each Android app which wants to connect to communicate with AWS. These

In this article will emphasize on some important characteristics and invariants with respect to transformations in projective geometry. Some properties in projective geometry The following properties are important to know if you want to work on stereo image processing, photogrammetry computer vision which contains 3D reconstruction, depth estimation and so on. For different dimensions in

The goal in this post is to give an overview of the security goal in IoT applications (CIA Model) and see if MQTT and CoAP protocols satisfy this goal. Due to rush to the market security in IoT devices often neglected. A small number of IoT devices support some protection and security which most of

This article tries to clarify and describe how insecure physical layer can cause insecurity in other layers and consequently causing different security issues. I will go through that by describing a very simple example using Mongoose OS. I try to describe the security aspects that we should consider whenever we use Mongoose OS and are

As described in last article, projective space can be considered as a tool to mathematically describe the perspective projection. So in this article, we want to go through some basics, but important elements of projective space. After reading this article you will get to understand the followings topics: Homogeneous coordinates and its properties Homography matrix

I decided to write some short articles about projective geometry, and so these basics will give you not only some insight into the basics of stereo image processing but also help you understand linear transformations better. After reading this article you should be familiar with: Perspective Projection Perspective Space Projective Geometry and you should not

This post is the second part of the last post and will describe the architecture along with characteristics of Malware especially Mirai and Hajime. Characteristics of IoT malware As mentioned before, the IoT device should get the Malware in order to participate in DDoS attacks. Most of the malwares are Linux based and has limited

The goal in this post and the next one is to describe Distributed Danial of Service attack, its architecture, and the most common Malware for DDoS in IoT devices. What is Danial of Service One of the most popular attacks is the Denial of Service attack in which the attacker tries to make the server

In the last three posts, we have learned some important basics in computer vision and in this post, I want to talk about the concept “Feature” which plays an important role in different levels of image processing. Feature (local Feature) In image processing, feature (local feature) is basically a piece of image (patch) which can

In this post, I’m going to describe basic and important parameters for camera and lenses. After reading this post you should have the following knowledge: Clearly know what is Focal Length Aperture Depth of View Clear understanding of different types of lenses Field of View Sensor size Shutter Speed ISO Maximum Transmission Unit (MTU) Ground