Pixels With Coordinate System and Resolution

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Pixels With Coordinate System 
and Resolution


Any building like house or hospital…etc  consists of several floors and each floor consists of internal units - each unit consists of a total of bricks
So brick is the structural unit of any building.
The picture is also an expression of a particular building - constructed using its own structural units - these units are called (Pixels) . 



What is Pixel?

The word “pixel” means a picture element .Pixel is the structural unit of any digital image . They are the smallest unit of information that makes up a picture they are typically arranged in a 2-dimensional grid (array). 





group of pixels(source)
This is one pixel in image(source)



group of pixels (source)





finally - pixel is consider as  a small image. It have intensity , color and some patterns.

(source)






The Image Coordinate System

earlier, an image is represented as a grid which  made up of rows and columns of pixels. so the image actually  is like this :
2D array 

A pixel in an image can be specified by saying which column and which row contains it
In terms of coordinates, a pixel can be identified by a pair of integers giving the column number and the row number. For example, the pixel with coordinates (3,5) would lie in column number 3 and row number 5.
 columns are numbered from left to right, starting with zero.
(source )






Resolution

Image resolution describes the amount of detail that an image contains so we can say the Higher resolution means more image details and lower resolution means low image details .

The resolution of digital images can be described in many different ways.

·       Pixel resolution

·       Spectral resolution

·       Temporal resolution

·       Radiometric resolution

 

In our field we need to focus in pixel resolution only  so let's go to Understand it deeply .


Pixel resolution is Number of Total Pixels in the image .
for example a Pixel resolution for image is   720×1024 . that means there are 720 Column of pixels along the width from left to right , and 1024 row of pixels along the high from top to bottom and the total pixels for this image is
720×1024 =737280 pixels
Another example If an image  is 2048 pixels in width and 1536 pixels in height  so Pixel resolution(the total pixels in the image) is
 2048×1536 = 3,145,728 pixels  or 3.1 megapixels.

Below is an illustration of how the same image might appear at different pixel resolutions


I hope this article has been reported to you - I have tried hard to shorten it without a work flaw in understanding the basics as much as possible.
Be free to contact via my email any time
Thanks.







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