Rico's Nerd Cluster

「离开世界之前 一切都是过程」

Computer Vision - Pinhole Camera Model

This Blog Shows How A Small Magic Peek Hole Captures The World

Introduction Camera is intriguing. There have been many different types with different types of lenses (such as fisheye, wide angle Lens). However, the most original (and the simplest) form of cam...

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

Web Development - Reactive Design

React, Flask

React React itself is just a UI library and doesn’t bundle any network protocol or “live-update” mechanism under the hood. It re-renders your components whenever you call setState (or update state...

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

Web Development - Flask

React, Flask

Launch an App Since Flask 2.2, threading is by default: app.run(threaded=True) # default since Flask 2.2 the Werkzeug dev server starts one OS‑level process and spawns a new thread...

Posted by Rico's Nerd Cluster on June 1, 2021

Computer Vision - Random Tree

Random Tree

Introduction Simple Example: Predicting Lottery Purchase with a Decision Tree Imagine we have two pieces of information about a person: Age Income The task is: we want to predict whether ...

Posted by Rico's Nerd Cluster on April 24, 2021

Computer Vision - MeanShift and CamShift: Tracking an Object by Its Color

MeanShift and CamShift are simple tracking algorithms. They do not understand that an object is a mine, vehicle, or person. Instead, they remember the object’s color distribution and search for pix...

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

Computer Vision - Moiré Pattern

Noise Patterns Pattern Cause How to recognize it Moiré Two similar spatial patterns or grids Changes strongly with scale, angle, or res...

Posted by Rico's Nerd Cluster on February 4, 2021

Computer Vision - RANSAC

Introduction RANSAC means: RANdom SAmple Consensus. It is a robust fitting method for data with outliers. Normal least-squares fitting asks: What model minimizes total error over all points? RANSA...

Posted by Rico's Nerd Cluster on February 1, 2021

Computer Vision - Tessellation

Tessellation Tessellation means converting smooth CAD surfaces into a triangle mesh. Linear deflection controls how far the triangle mesh is allowed to deviate from the true CAD surface. Smaller l...

Posted by Rico's Nerd Cluster on January 30, 2021

Computer Vision - Ray Tracing, Ray Casting, Gaussian Splatting

Introduction In the 16th century one innovative artist, Albrecht Düre created a “Perspective Machine” to help artists draw perspectives accurately. He did this by creating a screened 2D frame, bet...

Posted by Rico's Nerd Cluster on January 27, 2021

Robotics - [Motion Planning 1] Overview And A star Variants

A Star

The “old school” path planning pipeline is: 1 Path Planning -> Trajectory Optimization A Star Setup: Maintain a priority_queue to store all nodes to expand The priority queue i...

Posted by Rico's Nerd Cluster on January 24, 2021

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Robotics @ Northwestern University

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