0
Rasterisation is the progressive scanning of an image in a line by line fashion.
TV and computer displays are scanned left to right line by line and so are raster displays.
Vectorisation or vector graphics are the opposite of rasterisation. In this method of display the image is drawn in a point to point method. An oscilloscope is an example of a vector display.
Raster graphics have the advantage of having the same refresh rate all the time irrespective of the complexity and colour depth of the image drawn (this is not the same as the framerate). All home computers now use a raster display output.
Vector graphics can be coloured but are line drawings only. Examples of this type of colour vector display is the 1980's game Starwars or the monochrome Vectrex games consol from the same period.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoRasterizing is the process of changing the image representaiton from vector-based to raster-based. The name comes from the fact that the curves are drawn in a virtual space and their intersection with the raster is used to get the raster pixels.
Add your answer:
Earn +20 pts
What is vectorization in GIS?
Vectorization is the process of converting raster data into vector data. the opposite is called rasterization.
When TV first came out how many hours was it on for?
in 1884 Paul Gottlieb Nipkow, a 23-year-old university student in Germany, patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiraling toward the center, for rasterization. The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image. Nipkow's design would not be practical until advances in amplifier tube technology became available. The device was only useful for transmitting still "halftone" images-represented by equally spaced dots of varying size-over telegraph or telephone lines.[citation needed] Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube (CRT) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors. In 1907 Russian scientist Boris Rosing became the first inventor to use a CRT in the receiver of an experimental television system. He used mirror-drum scanning to transmit simple geometric shapes to the CRT
Inventer of television?
Television is a widely used telecommunication medium for sending (broadcasting) and receiving moving images, either monochromatic ("black and white") or colour, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele, far, and Latin visio, sight (from video, vis- to see, or to view in the first person).Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s, recordings on video cassettes, and later, digital media such as DVDs, have resulted in the television frequently being used for viewing recorded as well as broadcast material. In its early stages of development, television included only those devices employing a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image. By the late 1920s, however, those employing only optical and electronic technologies were being explored. All modern television systems rely on the latter, however the knowledge gained from the work on mechanical-dependent systems was crucial in the development of fully electronic television.In 1884 Paul Gottlieb Nipkow, a 20-year old university student in Germany patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiralling toward the centre, for "rasterization", the process of converting a visual image into a stream of electrical pulses. The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.Nipkow's design would not be practical until advances in amplifier tube technology became available in 1907. Even then the device was only useful for transmitting still halftone images - those represented by equally spaced dots of varying size - over telegraph or telephone lines. Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube (CRT) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors.Scottish inventor John Logie Baird demonstrated the transmission of moving silhouette images in London in 1925, and of moving, monochromatic images in 1926. Baird's scanning disk produced an image of 30 lines resolution, barely enough to discern a human face, from a double spiral of lenses.By 1927, Russian inventor Léon Theremin developed a mirror drum-based television system which used interlacing to achieve an image resolution of 100 lines.Also in 1927, Herbert E. Ives of Bell Labs transmitted moving images from a 50-aperture disk producing 16 frames per minute over a cable from Washington, DC to New York City, and via radio from Whippany, New Jersey. Ives used viewing screens as large as 24 by 30 inches (60 by 75 centimetre). His subjects included Secretary of Commerce Herbert Hoover.In 1928, Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices, which he first demonstrated to news media on 1928-09-01, televising a motion picture film.Television is a widely used telecommunication medium for sending (broadcasting) and receiving moving images, either monochromatic ("black and white") or colour, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele, far, and Latin visio, sight (from video, vis- to see, or to view in the first person).Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s, recordings on video cassettes, and later, digital media such as DVDs, have resulted in the television frequently being used for viewing recorded as well as broadcast material. In its early stages of development, television included only those devices employing a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image. By the late 1920s, however, those employing only optical and electronic technologies were being explored. All modern television systems rely on the latter, however the knowledge gained from the work on mechanical-dependent systems was crucial in the development of fully electronic television.In 1884 Paul Gottlieb Nipkow, a 20-year old university student in Germany patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiralling toward the centre, for "rasterization", the process of converting a visual image into a stream of electrical pulses. The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.Nipkow's design would not be practical until advances in amplifier tube technology became available in 1907. Even then the device was only useful for transmitting still halftone images - those represented by equally spaced dots of varying size - over telegraph or telephone lines. Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube (CRT) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors.Scottish inventor John Logie Baird demonstrated the transmission of moving silhouette images in London in 1925, and of moving, monochromatic images in 1926. Baird's scanning disk produced an image of 30 lines resolution, barely enough to discern a human face, from a double spiral of lenses.By 1927, Russian inventor Léon Theremin developed a mirror drum-based television system which used interlacing to achieve an image resolution of 100 lines.Also in 1927, Herbert E. Ives of Bell Labs transmitted moving images from a 50-aperture disk producing 16 frames per minute over a cable from Washington, DC to New York City, and via radio from Whippany, New Jersey. Ives used viewing screens as large as 24 by 30 inches (60 by 75 centimetre). His subjects included Secretary of Commerce Herbert Hoover.In 1928, Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices, which he first demonstrated to news media on 1928-09-01, televising a motion picture film.Television is a widely used telecommunication medium for sending (broadcasting) and receiving moving images, either monochromatic ("black and white") or colour, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele, far, and Latin visio, sight (from video, vis- to see, or to view in the first person).Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s, recordings on video cassettes, and later, digital media such as DVDs, have resulted in the television frequently being used for viewing recorded as well as broadcast material. In its early stages of development, television included only those devices employing a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image. By the late 1920s, however, those employing only optical and electronic technologies were being explored. All modern television systems rely on the latter, however the knowledge gained from the work on mechanical-dependent systems was crucial in the development of fully electronic television.In 1884 Paul Gottlieb Nipkow, a 20-year old university student in Germany patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiralling toward the centre, for "rasterization", the process of converting a visual image into a stream of electrical pulses. The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.Nipkow's design would not be practical until advances in amplifier tube technology became available in 1907. Even then the device was only useful for transmitting still halftone images - those represented by equally spaced dots of varying size - over telegraph or telephone lines. Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube (CRT) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors.Scottish inventor John Logie Baird demonstrated the transmission of moving silhouette images in London in 1925, and of moving, monochromatic images in 1926. Baird's scanning disk produced an image of 30 lines resolution, barely enough to discern a human face, from a double spiral of lenses.By 1927, Russian inventor Léon Theremin developed a mirror drum-based television system which used interlacing to achieve an image resolution of 100 lines.Also in 1927, Herbert E. Ives of Bell Labs transmitted moving images from a 50-aperture disk producing 16 frames per minute over a cable from Washington, DC to New York City, and via radio from Whippany, New Jersey. Ives used viewing screens as large as 24 by 30 inches (60 by 75 centimetre). His subjects included Secretary of Commerce Herbert Hoover.In 1928, Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices, which he first demonstrated to news media on 1928-09-01, televising a motion picture film.www.loools.com copyright (c)
How Graphics Device Interface work?
The Graphics Device Interface (GDI), together with the kernel and the Windows API, is one of three main components or "sub", for the user interface, Microsoft Windows GDI and in particular deals with the graphic representation of objects and transmit them to output devices such as monitors and printers. GDI is responsible for tasks such as the drawing of lines and curves, rendering fonts and management of palettes. It is not directly responsible for drawing windows, menus. The most significant ability to GDI about methods of access to hardware is its ability to scale and abstraction of devices destination. Drawing on multiple devices, such as a printer or a screen, it becomes much easier using GDI and in any case a correct reproduction of graphics. This capacity is at the centre of all WYSIWYG applications for Microsoft Windows. Although GDI can not properly animated and lacks rasterization for 3D is still used by the simple games that do not require a quick use of rendering graphics GDI. With the introduction of Windows XP, the use of GDI was deprecated in favor of his successor GDI + based on the C + +. GDI + is a 2D graphics environment better thanks to its advanced features such as anti-aliasing 2D graphics, floating point coordinates, shading gradient, a more complex path management, support for modern graphics - as file formats and JPEG PNG (supports that lacked the GDI), and general support for composition of similar transformations in the 2D view pipeline. GDI + ARGB uses to represent the values of color. The use of these characteristics is evident in the way Windows XP with the user interface and several of its applications such as Microsoft Paint, Windows Picture and Fax Viewer, Photo Printing Wizard, My Pictures Slideshow screensavers, and their presence in the basic graphics layer greatly simplifies implementations of vector-graphics systems such as Flash or SVG. The GDI + dynamic library can be shipped with an application and used under older versions of Windows. In September 2004 was discovered a vulnerability in GDI + and other graphics API due to a defect in the JPEG standard library which allowed the execution of arbitrary code on any system that displayed a JPEG file malicious "using an instrument based on GDI +. A patch was issued to resolve the issue on October 12, 2004. With the arrival of Windows view GDI and GDI +, like all Windows applications, run in the Desktop Window Manager, the new engine compositing built above the Windows Display Driver Model. The GDI render path is redirected through DWM and GDI is no longer hardware-accelerated. However, due to the nature of desktop composition (internal management of moving bitmaps and transparency and anti-aliasing of GDI + being handled at the core DWM), operations like window moves and resizes can be faster or more responsive because underlying content need not be re - rendered. The GDI also saves on the cost printers through the print processor called GDI printer that uses software to do all the treatment of the press, instead of requiring the printer hardware to do so. It works by rendering an image to a bitmap on the host computer and then sending the bitmap to the printer. In general, usually the lowest cost GDI printers are devices. Most manufacturers also produce more flexible models that add compatibility PCL or PostScript, or both. In most cases, only the lowest-cost models in a specific range manufacturer's GDI who are alone. With Windows Vista onwards, GDI-based printers are intended to be replaced by XPS printers. XPS document format is the native format print spooler in Windows Vista. It serves as the page description language (PDL) for printers. For printers to support XPS, this eliminates the intermediate conversion to a printer-specific language, increasing the reliability and accuracy of press compared to the press GDI. When the legacy GDI Press path is used, the XPS spool file is used for treatment before it is converted into a GDI image to minimise the treatment done at the level raster.
