All language subtitles for 1. What are Images

Hi and welcome to Section 2 of this course where we're going to take a look at the basics of computer

vision and open C.v.

So I will just briefly go over the topics we're covering in this section.

So firstly we're going to take a look at what exactly are images and how were they formed after that

we're going to look at how images are stored on computers.

And then after we complete what we're actually going to get started into open C-v and do some basic

operations such as reading writing and displaying images then performing Grayskull operations then taking

a look at the different colors spaces that we have available and also representing images in a histogram

form and how you interpret that.

And lastly we're going to use open C-v to draw some basic shapes and put text on images.

So what exactly are images.

Now I have the one line definition here for images which tells us that images are two dimensional representation

of the visible light spectrum.

So what exactly does that mean.

What is two dimensional.

I mean in this context.

You may have a theory or idea that an image can be a photograph can be something you see on your laptop

screen or a TV screen and that's exactly right.

Those are all two dimensional planes where it is only an x y dimension and that x y dimension here corresponds

to different pixel points on computer screens or in the photographs.

Basically dots inch deep you may have hit that in somewhat a form printer printers perhaps and so know

each pixel or GPI point reflects different wavelengths of light and that is where we refer to the visible

light spectrum.

No the visible light spectrum is part of the electromagnetic spectrum which consists of radio waves

all the way to gamma rays and different waves here have different wavelengths and the visible part.

What we see visible because it's visible to eyes consists of different wavelengths and each wavelength

corresponds to different colors all the way from red green to blue and slightly purple.

So no in an image like this this is Van Gogh's Starry Night painting.

Each point corresponds to a different color which means that reflects different wavelengths of light

which is what we see in these images.

So no I hope you have a faint idea or at least an idea of what images are.