Rico's Nerd Cluster

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Computer Vision - ORB Features And Matching

This Blog Shows The Theory and Implementation From Scratch of ORB Features

Intro In SLAM and Computer Vision, distinguishing the same points across multiple camera views is necessary for visual odometry. These “distinguishable points” are called features. In general, we ...

Posted by Rico's Nerd Cluster on January 22, 2021

Computer Vision - Harris Corner Detector

Do Not Cut Corners on Corner Detector - It Will See It

Basic Idea When a specified window truly has a corner, if we shift a window (region of interest) along any direction (+/- x or y direction) slightly by small displacements, $u$, $v$, we could expe...

Posted by Rico's Nerd Cluster on January 20, 2021

Computer Vision - Warping

Affine Transformation, Perspective Warping, Non-Linear Warping.

Introduction Warping is a process to transform pixels to another shape using a mapping function. There are three kinds of warping: affine warping, perspective warping, and non-linear warping. They...

Posted by Rico's Nerd Cluster on January 7, 2021

Computer Vision - Non Maximum Suppression

Non Maximum Suppression (NMS), Intersection over Union (IoU), TensorFlow non_max_suppression

In image classification, we often get many bounding boxes of the same object in a small subarea. Non Maximum Suppression (NMS) can help us pick which boxes we want to keep. Inputs: Bounding bo...

Posted by Rico's Nerd Cluster on January 5, 2021

Computer Vision - Blurring

Gaussian Blurring (Under Active Updates)

Gaussian Blurring TODO OpenCV Implemenation 1 2 3 4 5 6 7 8 9 10 def get_gaussian_kernel(size:int): """ We're not sure the padding rule of cv2.GaussianBlur - Technically applying the id...

Posted by Rico's Nerd Cluster on January 3, 2021

Git - Workflows

Git Test Runners, CI/CD, PyPi

Local Git Repo Setup Copy ssh key to Github Set up email and username: 1 2 git config --global user.name "Your Name" git config --global user.email "your_email@example.com" Set Up Github ...

Posted by Rico's Nerd Cluster on September 10, 2019

Arduino Notes

View

Common Commands millis() is unsigned long 1 unsigned long previous_time = millis() uint8_t lowByte(uint16_t value); 1 2 3 uint16_t value = 0x1234; uint8_t lower = lowByte(value); ...

Posted by Rico's Nerd Cluster on March 6, 2019

Python - Numpy View and Contiguous Array

View

What is np.view When slicing or transpose takes place on an array, we actually get a np.view object that shares the underlying memory with the array. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ...

Posted by Rico's Nerd Cluster on March 6, 2019

Python - Numpy and Pandas Operations

A Mumbo Jumbo Of Numpy and Pandas Operations and Examples

Numpy General Programming Rules In Numpy np allocates memory like C, so it’s contiguous. Math operations can be applied to all elements, which is a lot faster than for loop and use math modu...

Posted by Rico's Nerd Cluster on March 3, 2019

Python - Python Subprocessing

Subprocess

Subprocess Module Reference The recommended approach to invoking subprocesses is to use the run() function for all use cases it can handle. For more advanced use cases, the underlying Popen inter...

Posted by Rico's Nerd Cluster on February 9, 2019

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