image technology
DESCRIPTION
Multimedia. Image Technology. Technology. Krich Sintanakul 271430 Multimedia and Hypermedia. Technology. Types of Images. Raster Image Digitize or sampling from the real world Store in bitmap orientation Need large storage and High compression Edit by retouching tool Vector Image - PowerPoint PPT PresentationTRANSCRIPT
MultimediaTechnology Image Technology
Krich Sintanakul271430 Multimedia and Hypermedia
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Types of Images
• Raster Image– Digitize or sampling from the real world– Store in bitmap orientation– Need large storage and High compression– Edit by retouching tool
• Vector Image– Synthesized image– Store in object structure list (Smaller)– Reusable , Scalable , Animating– No stair problem
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Types of Images
• Raster Image
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Types of Images
• Vector Image
(xmin,ymin)
(xmax,ymax)
01Object RectanPPPPP PPPPPP
Data (xmin,ymin,xmax,ymax) Rectangular (xmin,ymin,xmax,ymax)
begin lineto (xmin,ymin,xmax,ymin) lineto (xmax,ymin,xmax,ymax) lineto (xmin,ymin,xmin,ymax) lineto (xmin,ymax,xmax,ymax)
end end object
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Types of Images
• From vector to raster display system
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Displaying Image in Computer
• - Cathode Ray Tubes and LCD panel
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Displaying Image in Computer
• Source of color
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Displaying Image in Computer
• Source of color in CRT
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Displaying Image in Computer
• Color Mixing in RGB model
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Displaying Image in Computer
• Raster scan display system
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Displaying Image in Computer
• Raster scan display system
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Displaying Image in Computer
• Color Raster scan display system
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Displaying Image in Computer
• Raster scan display system
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Type of color display system
• True Color system– 2416/ Bits each pixel– 3 /2 Bytes per pixel– PPPP PPPPP PPPPPPPPP PP PPPP P PPPPPP
• Index Color system– 8 (1 )bits byte per pixel– PPPP PPPPP PPPPP PP P PPP P2 56– Keep address of table in Frame buffer
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Type of color display system
• True Color system
N
M
Bit depthVideo
controller CRT
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Type of color display system
• True Color system– VGA 2 4 Bits 6 4 0 * 4 8 0 = 3 0 7 2 0 0 Pix
els = 9 2 1 6 0 0 Bytes– PPP1 6 6 40*480 307200
els = 6 1 4 4 0 0 Bytes– PPPPP24 800*600 = 480000 =1 440000– 16 800*600 480000SVGA Bits = Pi
xels = 9 6 0 0 0 0 Bytes
1 Byte 1 Byte
1 Byte 1 Byte 1 Byte
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Type of color display system
• Index Color system
P
y 501
01001
Color TableR G B
0
255
00
01001010010011110001101050
3 8 24colors x bits/column = bits
///
P
P 8 bits Frame Buffer
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Type of color display system
• Index color system– 256 640*480 307200 307VGA Color = Pixels =
200 Bytes PPPPP2 5 6 * 3 (2 4 ) 7 6 8
PPPPP307200 + 768 = 307968
– PPPPP256 800*600 = 480000 =4 80000 256*3 24 768Index table ( bits) Bytes
480000 768 480768Total + = Bytes
– 256 1024*768 786432 7SVGA Color = Pixels = 86432 Bytes
256*3 24 768Index table ( bits) Bytes
786432 768 787200Total + = Bytes
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How to display an image file(1)
• BMP indexed file structure
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Howt o di spl ay an i mage fi l e(2 )
• Step 1 Load image information
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How to display an image file(3 )
• Step2 Load col or i ndex t o vi deo pal let
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How to display an image file(4 )
• Step 3 Load pixel information by lookup color pallet