Multimedia Systems
MULTIMEDIA SYSTEMS
Video
Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.
Raw video can be regarded as being a series of single images. There are typically 25, 30 or 50 frames per second.
There are two types of video recording systems/formats. Also, the term video ("video" meaning "I see", from the Latin verb "videre") commonly refers to several storage formats for moving pictures. These are Analog Video and Digital Video.
The world we sense is full of analog signal; electrical sensors such as transducers, thermocouples, microphones convert the medium they sense into electrical signals. These are usually continuous and still analog. These analog signals must be converted or digitised into discrete digital signals that computer can readily deal with.
Special hardware devices called Analog-to-Digital converters perform this task.
For playback Digital-to-Analog must perform a converse operation.
Analog Video
Analog Video is usually captured by a video camera and then digitised.
Digital Video
Digital video is a type of video recording system that works by using a digital rather than an analog video signal.
Digital video comprises a series of orthogonal bitmap digital images displayed in rapid succession at a constant rate. In the context of video these images are called frames. We measure the rate at which frames are displayed in frames per second (FPS).
Since every frame is an orthogonal bitmap digital image it comprises a raster of pixels. If it has a width of W pixels and a height of H pixels we say that the frame size is WxH.
Pixels have only one property, their color. The color of a pixel is represented by a fixed amount of bits. The more bits the more subtle variations of colors we can reproduce. This is called the color depth (CD) of the video.
An example video can have a duration (T) of 1 hour (3600sec), a frame
Video
Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.
Raw video can be regarded as being a series of single images. There are typically 25, 30 or 50 frames per second.
There are two types of video recording systems/formats. Also, the term video ("video" meaning "I see", from the Latin verb "videre") commonly refers to several storage formats for moving pictures. These are Analog Video and Digital Video.
The world we sense is full of analog signal; electrical sensors such as transducers, thermocouples, microphones convert the medium they sense into electrical signals. These are usually continuous and still analog. These analog signals must be converted or digitised into discrete digital signals that computer can readily deal with.
Special hardware devices called Analog-to-Digital converters perform this task.
For playback Digital-to-Analog must perform a converse operation.
Analog Video
Analog Video is usually captured by a video camera and then digitised.
Digital Video
Digital video is a type of video recording system that works by using a digital rather than an analog video signal.
Digital video comprises a series of orthogonal bitmap digital images displayed in rapid succession at a constant rate. In the context of video these images are called frames. We measure the rate at which frames are displayed in frames per second (FPS).
Since every frame is an orthogonal bitmap digital image it comprises a raster of pixels. If it has a width of W pixels and a height of H pixels we say that the frame size is WxH.
Pixels have only one property, their color. The color of a pixel is represented by a fixed amount of bits. The more bits the more subtle variations of colors we can reproduce. This is called the color depth (CD) of the video.
An example video can have a duration (T) of 1 hour (3600sec), a frame