Image Resolution
Digital image is an 2-dimensional matrix of sampled intensity(gray/colour) values.
Image Resolution refers to the total number of pixels in an image along with how much detail the image portrays.
Some image resolutions are:
a) Spatial resolution:
It refers to the amount of smallest discernible detail in an image known as pixel.
It is indicated as 1024x1024 which means 1024 pixels on both width & height of image as shown below.
Higher the spatial resolution, higher the image quality & higher the amount of pixels required to represent the image.
b) Intensity level resolution:
It refers to the number of intensity levels used to represent the image.
The more intensity levels used, the finer the level of detail discernible in an image.
Intensity level resolution is usually given in terms of the number of bits used to store each intensity level.
Higher the intensity level, higher the image quality and higher the size of image. Like 1920x1080px image with higher intensity level is more better than the image of same image with lower intensity level.
Videos are simply the fast display of pictures which makes us perceive them as they are in motion. For 1080p videos(Full HD), each picture frames of the video are of size 1920x1080 px. Also, for 720p videos(HD or HD Ready), each picture frames are of size 1280x720 px.
References:
[1] Digital Image processing 3rd edition, Rafael C. Gonzalez & Richard E. Woods
