multimedia technology image technology krich sintanakul 271430 multimedia and hypermedia
TRANSCRIPT
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