CS231n - Lec1. Intro

A brief history of computer vision

Block world 60s

first PhD thesis of cv 

visual world -> simple geometric 

recognize & reconstruct shape

 

The Summer Vision Project 60s

 

David Marr 

MIT vision scientist 

cv , algorithm -> recognize visual world

 

primal sketch

input image -> edge image -> 2 1/2-D sketch -> 3-D model

 

Representation - object recognition 

Every object is composed of simple geometric primitives -> reduce complex shape  

70s

generalized cylinder & Pictorial structure 

 

80s David Lowe 

line + edges 

 

image segmentation

group the pixels into meaningful areas

 

AdaBoost algorithm -> real-time face detection (2001)

Fujifilm's face detecting camera (2006) 

 

SIFT feature 

match the same object in different images 

 

histogram of gradients

deformable part models 

 

PASCAL Visual Object Challenge

ImageNet 

CS231n overview 

CS231n focuses on one of the most important problems of visual recognition-image classification 

image - algorithm - pick from among fixed categories - classify image 

and... 

object detection - where objects are in image 

action classifcation 

image captioning