Point cloud animation in Blender

August 28, 2017

This is a tutorial on how to render the point cloud animation in Blender. We use the Blender Render engine instead of Cycles.

Essential matrix

August 16, 2017

• 5-point algorithm
• estimate from Fundamental matrix

A framework for RANSAC

August 13, 2017

RANSAC is short for Random SAmple Consensus, which is an iterative method to estimate parameters of a mathematical model from a set of observed data that contains outliers. It can be incorporated to estimate many key matrices in vision, such as homography, fundamental/essential matrix, etc. This post aims to develop a general framework so that RANSAC could be easier applied to existing estimation algorithms. The code is modified from the code originally written by Ziv Yaniv.

Estimation of camera pose

August 6, 2017

There are multiple ways of estimating camera position and orientation, typical approaches include

• camera pose from point correspondences
• camera pose from Fundamental matrix

VLFeat wrapper

July 22, 2017

The keypoint detector and descriptor classes implemented are a wrapper of the amazing vlfeat functionalities. There are three separated classes, they are:

Triangulation

July 10, 2017

Problem definition

Given camera matrices (\(P, P'\)), or fundamental matrix \(F\), and measured image points \(x\) and \(x'\), estimate the 3D point \(X\) that minimizes some cost function.

Git cheatsheet

July 6, 2017

Exclude a directory

Create a .gitignore file in root, and add the directory name in it

dir_name/

An introduction to the `mex` file and useful implementations

July 5, 2017

I use mostly Matlab to test my algorithms, it’s super easy to implement and fast enough for matrix computation. However, for some computationally heavy tasks that is hard to implement as matrix computation, I would normally turn to C++ for its efficiency. Thus I need an additional mex file so that my Matlab code can use the C++ code. To do so, most of the job required is to convert matlab data into C++ data, and I create some methods just for this purpose so that I don’t need to do this all over again next time. So here it is.

C++ implementation of a image class

June 16, 2017

The internal data structure used to store image is a vector of unsigned char. Here are a list of basic functionalities included in the Image class

Change to the al-folio theme

June 14, 2017

This Jekyll theme is developed by Maruan Al-Shedivat, which is modified from the original template -folio developed by Lia Bogoev. Thanks to those two for this clean, and simplistic design.