raster scan architecture computer graphics .pptx

raster scan architecture computer graphics .pptx

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  RASTER SCAN ARCHITECTURE PRESENTEDBY SUJAL TAMIDEWA SHRESTHA (800342) SUJIT MANANDHAR (800343) SUKRISH DUWAL (800344)
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  Introduction Raster scan architectureis a type of image scanning and display technology used primarily in CRT (Cathode Ray Tube) monitors and other display systems, where the screen is drawn line by line, from top to bottom, in a continuous pattern. Defination:
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  How Raster imagesare formed?? • Basically raster images are formed by combination of small pixels.Small pictures combine together to form a larger images.
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  Application of RasterScan Architecture: • Computer Monitors & TVs • Graphics & Image Processing • Gaming & Entertainment • Medical Imaging • Printing & Publishing
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  Why Raster Scanis Preferred? ✔Supports high-resolution, full-color graphics ✔ Enables smooth shading and anti-aliasing ✔Capable of handling motion graphics efficiently ✔Compatible with modern digital display technology
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  Architecture of Rasterscan • This architecture consists of three main components: Frame buffer, Video controller, and Display processor. • The image which has to be displayed is saved in a binary format (0s and 1s) in the refresh buffer memory. • Then, a video controller is used to scan each and every line of the Frame buffer/Refresh Buffer Memory.
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  • The linesare scanned from left to right and when a line is finished, again the controller moves to the next line and scans the line from left to right, and so on. • Then, a frame buffer memory, which holds the coordinates of all the screen points, is used to determine the coordinates of the screen. • After that, the actual image is produced in the Cathode Ray Tube.
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  Advantages of RasterScan System • Better Resolution – Raster scan systems provide high-resolution images with smooth shading and fine details. • Supports Complex Graphics – It can display detailed images, including curves, shaded areas, and realistic textures. • Efficient Color Handling – Supports multiple colors and gradients for rich visual representation. • Cost-Effective – Cheaper than vector scan systems because it uses standard display technology.
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  • Memory-Based Storage– Images are stored in a frame buffer, making it easier to edit and manipulate. • Refresh Control – Uses a refresh buffer to continuously update the display, ensuring a stable image. • Widespread Use – Used in TVs, monitors, and digital screens, making it a standard in display technology.
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  Disadvantage of rasterscan system • Slow Response Time – The screen updates pixel by pixel, which can cause lag in fast-moving images, making it unsuitable for high-speed applications like gaming. • High Power Consumption – The continuous scanning process requires more power compared to other display technologies. • Flickering Issues – If the refresh rate is too low, flickering can occur, leading to eye strain and discomfort. • Limited Resolution Scaling – Increasing resolution significantly can slow down the refresh process, making it inefficient for very high- resolution displays.
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  • Complex MemoryRequirements – A large frame buffer is needed to store pixel data, increasing memory usage compared to vector displays. • Screen Burn-in – Prolonged display of static images can cause permanent burn-in, reducing screen lifespan (especially in older CRTs). Screen burn issue in monitor
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  Conclusion: The Raster ScanSystem is an efficient and widely used display technology that offers high resolution, rich colors, and smooth image rendering. Its cost-effectiveness and ability to handle complex graphics make it ideal for monitors, TVs, and digital screens.