Lecture 1 | Introduction to Convolutional Neural Networks for Visual Recognition
visual data = “the dark matter of the internet”
- existence but hard to recognize
In humans, we have almost 50% of the neurons in our cortex involved in visual processing it is the biggest sensory system.
Hubel & Wiesel, 1959
- using electrophysiology
- question?: what was the visual processing mechanism like in primates(영장류), in mammals(포유류)
- used cat brain
- what they did - stick some electrodes in the back of the cat brain which is where the primary visual cortex area is - and then look at what stimuli makes the neurons in the back in the primary visual cortex of cat brain respond excitedly
- learned
- there are many types of cells in the, in the primary visual cortex part of the cat brain
- one of the most important cell is the simpel cells they respond to oriented edges when they move in certain directions
- visual processing starts with simple structure of the visual world - oriented edges - and as information moves along the visual processing pathway. The brain builds up the complexity of the visual information until it can recognize the complex visual world.
David Marr
Object Recognition <– segmentation
Why CNN is suddenly populated in 2000’s?
- Computation
- Data