interpolated resolution -The webcam Myths
Yet another post on Megapixels , Hope the previous post will be helpful to you to fully appreciate it
A typical customer who walks in to a computer shop to purchase a webcam is faced with so many confusing choices . The irresistible offer is a range of web cams that offer 12 to 20 Megapixels at an unbelievable price. 20 megapixels !! , my nokia has only 5 Megapixel and my DSLR has only 14 and this nice guy at the shop is offering me 20 Megapixels for just INR 800.
Too good to be true is it ? , if that webcam really transmitted video on that resolution , I need a 2Gpbs leased line to maintain my yahoo chat
just check the advtersement from e-bay about a popular brand of webcam in the industry
if you notice closely there is a line which mentions that the resolution is Interpolated . Ie 25Megapixel Interpolated.
Interpolation is a mathematical method by which the resolution can be increased by inserting some additional pixels in between the actual pixels and thereby giving a false feeling of higher resolution.
If you closly look at the details of the camera , it clearly syay that the maximun video resolution it supports is 640 X 480 . If do do our maths , 640 X 480 = 307200 , divide the number by 1000,000 , we will get the value in mega pixel . ie a whooping 0.3 megapixel , not even one mega pixel .
So what ever may the extra technical factors they mentioned in fine print , claiming a 0.3 megapixel camera as a 20 megapixel camera can only be described as Cheating . Hope the whole hardware industry will take caution against such false claims from the hardware vendors .