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Introduction to Computer Vision

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  Do you ever think, how Facebook can automatically tag your friend when you upload an image, how your smart phone can recognize you, using it's very advanced and accurate  Face recognition feature.  Have you ever thought how a picture is processed by computer , how a picture  is stored in computer  etc.   These are very few examples, many more will be discussed as we go on, of Computer Vision. Well, In this post we are going to discuss about Computer Vision. So let's get started. What is C omputer Vision ? Computer Vision is a  interdisciplinary field that helps computer to make high-level understanding from digital images and videos to automate the task that human visuals do. It use some techniques  by which computer can understand many useful information from an image and perform some action based on that information. We see an image and our brain can understand the message, delivered by the image. Machines do exactly the same thing. ...
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Logistic Regression

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In the previous post we have discussed what is Regression and and what is Linear Regression in depth. In this Post we are going to see about LOGISTIC REGRESSION, a classification technique, used in MACHINE LEARNING. What is Logistic Regression? Logistic Regression is another supervised, statistical, predictive model used for classification mostly in 2 classes. But this technique can be used for multinomial classification i.e. more than 2 classes using some method like ' OVR '( ONE VS REST ), ' multinomial ', 'auto' etc.  Note: method will be selected depending upon the solver by default. For more info click  here. Logistic Regression - A Regression Problem This is a very important concept. Actually Logistic regression is implemented using Linear regression. At the end there is a conversion method(discussed later) to make sure the result i.e. the probability for each class lies between 0 and 1.  (0  <  P(A)  <  1) .   In the above, two pic...
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Distance measurement using opencv

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In Covid-19 pandemic, we all know about the importance of Social Distancing . Right now, It is the only thing that can help to reduce the number of affected people. So I have decided to make a social distancing checker using python. The main idea is to measure the distance of object in the image and if the distance between two objects are less than some predefined pixel value then 'green' dot at the center of the bounding-box will convert to 'red' dot . The output of the code will like this- social distancing checker Python code for Distance Measurement I am providing the python code to measure the distance of the object in the image or each frame of a video. Later I will discuss some key points related to the code. Key points to be Noted: Everything will be the same like object detection (discussed in Part-I and Part-II ) as I have implemented distance measurement based on object detection. We will filter out only the  'person' object   from the obje...
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