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SMART IP VIDEO

(Again?) The real truth about megapixels & HD

SECURITYINFOWATCH asked several people from the industry to give there view on (again) “The real truth about megapixels & HD”….. below an overview

Paul Bodell-Chief Marketing Officer-IQinVision, San Juan Capistrano, Calif.

“According to Wikipedia, ‘HD video refers to any video system of higher resolution than standard-definition (SD) video and most commonly involves display resolutions of 1280×720 pixels (720p) or 1920×1080 pixels (1080i/1080p).’

A number of manufacturers who are lacking in megapixel products would have you believe HD is something different or somehow better than megapixel. Truth is, HD is just marketing. The reality is that megapixel cameras have been able to deliver widescreen format, H.264, and a high frame rate for years now, they just weren’t marketed as HD.

Mark Gally-Vice President of Marketing-VideoIQ-Bedford, Mass.

“The most important thing for integrators to know is that HD implies a specific megapixel aspect ratio, frame rate and resolution (16×9 aspect ratio at 30fps with either a 720p or 1080p resolution). Because HD designates a subset of megapixel options, integrators should also know that other aspect ratios, frame rates and resolutions are available that may, or may not, suit a customer’s situation better than HD.

Important considerations when selecting the appropriate megapixel camera for an application include aspect ratios, frame rates, frame type and resolution. For example, 1.0MP and 2.1MP cameras, typical deliver 16×9 aspect ratios while 3.0MP and 5.0MP cameras deliver 4×3 aspect ratios. Therefore, integrators should consider whether a wider aspect ratio is in fact best for the specific application. Similarly, progressive, or ‘P’ cameras deliver full frame rate while interlace cameras, typically designated ‘I’ alternate between even and odd horizontal lines each frame-therefore delivering only half the stated frame rate. And finally, what resolution is most appropriate for a customer’s application?”


Ed Thompson-Chief Technology Officer-DVTel Inc.-Ridgefield Park, N.J.

“It’s important for systems integrators to know that generally all HD cameras qualify as megapixel cameras, however not all megapixel cameras support the HD standards. HD is standards based technology developed for motion pictures and HD broadcast while megapixel cameras only need to support more than 1 million pixels to qualify as an MP camera. The HD standard specifies the aspect ratio to be 16:9 wide screen vs. 4:3 used in legacy SD and megapixel cameras as well as color reproduction and encoding quality.

The advantage of HD is wide-screen capture, or wider field of view. This is a significant enhancement for numerous surveillance applications, because the typical camera captures a lot of sky and ceiling. With megapixel cameras, these images only get wider and wider, so incorporating HD standards in a megapixel camera helps to offset that fundamental issue.

Read More: http://bit.ly/megapixel_HD

Thanks: Securityinfowatch/Deborah L. O’Mara

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