Analog Cameras, IP Cameras and now Megapixel cameras, if you wonder what megapixel security cameras are, to begin with, it is well worth to have a look into what megapixels are. The resolution of an image is measured in horizontal and vertical lines consisting of dots/pixels, i.e for example an image with a VGA resolution which is 640 x 480 means there are 640 pixels per horizontal line and 480 pixels per vertical line. Therefore the total number of pixels that make up a VGA resolution image are 640 x 480 = 307200 total pixels. If these are measured in megapixels (in millions) 307200 would be 0.31 megapixels approximately. Therefore we can safely assume that an image with VGA resolution contains 0.3 megapixels, similarly 1280 x 1024 image = 1.3 megapixels, 2048 x 1536 = 3 megapixels. Although the most important part is to determine what area are the pixel spread on or determining the number of dots/pixels per inch (DPI) is utmost important. For example a VGA image (640480) with 100dpi is 6.43 wide and 4.83 high. There are variety of megapixel security cameras available in market ranging from 1.3megapixels onwards. Picture quality is at the best when using Megapixel security cameras. Digital Image sizes and terms: * CIF = Common Intermediate Format (Q=Quarter) - Video Resolution 352x288 in PAL and 352x240 in NTSC. The NTSC equivalent of CIF is SIF (Standard Image Format) * VGA = Video Graphics Array, Video Resolution - 640x480. * SVGA = Super Video Graphics Array, Video Resolution - 800x600. * XGA = Extended Graphics Array, Video Resolution -1027x768. * SXGA=Super XGA, Video Resolution - 1280x1024. * UXGA = Ultra XGA, Video Resolution - 1600x1200. Note: All the Graphic Array Resolutions (VGA, XGA etc) are non PAL and NTSC related.
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