WEBVTT

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

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vision and open C.v.

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

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

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

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

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

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

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form and how you interpret that.

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

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So what exactly are images.

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

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of the visible light spectrum.

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So what exactly does that mean.

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What is two dimensional.

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I mean in this context.

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

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

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

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

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

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

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light spectrum.

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

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

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

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

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

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

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which is what we see in these images.

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