A megapixel (MP) is 1 million pixels, and is a term used not only for the number of pixels in an image, but also to express the number of image sensor elements of digital cameras or the number of display elements of digital displays. For example, a camera with an array of 2048Ö1536 sensor elements is commonly said to have '3.1 megapixels' (2048 Ö 1536 = 3,145,728).
Digital cameras use photosensitive electronics, either charge-coupled device (CCD) or complementary metalâ€"oxideâ€"semiconductor (CMOS) image sensors, consisting of a large number of single sensor elements, each of which records a measured intensity level. In most digital cameras, the sensor array is covered with a patterned color filter mosaic having red, green, and blue regions in the Bayer filter arrangement, so that each sensor element can record the intensity of a single primary color of light. The camera interpolates the color information of neighboring sensor elements, through a process called demosaicing, to create the final image. These sensor elements are often called 'pixels', even though they only record 1 channel (only red, or green, or blue) of the final color image. Thus, two of the three color channels for each sensor must be interpolated and a so-called N-megapixel camera that produces an N-megapixel image provides only one-third of the information that an image of the same size could get from a scanner. Thus, certain color contrasts may look fuzzier than others, depending on the allocation of the primary colors (green has twice as many elements as red or blue in the Bayer arrangement).
High Definition surveillance management software now compatible on a wider range of IP cameras from suppliers such as Sony, Panasonic and Axis Communications
The Fastcam SA5 high speed camera from Photron with megapixel resolution at 7500 frames per second will be on show at the National Broadcasters Association Show in the USA
Worcester College of Technology has taken delivery of megapixel cameras from Mobotix for use in the preparation of course material for catering students
IP surveillance equipment supplier, Vivotek chooses the DM365 digital media processor from TI for its high performance range of day/night megapixel cameras
Latest version of TimeSight video lifecycle management system features motion optimised recording for improved protection whilst managing storage requirements
Dr Michael Korkin of Arecont Vision demystifies the H.264 compression standard to clarify the benefits of the codec which is sweeping the IP surveillance industry
DVR and NVR range from Wavestore provides all necessary configurations for recording video surveillance data regardless of camera technology or compression
Avigilon's High Definition surveillance system combines IP megapixel cameras and analogue video encoders for integrating existing analogue cameras at US Medical Centre
The latest megapixel mini dome camera in the Siqura range features discreet profile, rugged construction, backlight compensation and built-in tampering alarm
The Bonifacio hospital on the island of Corsica has significantly improved patient security whilst reducing the number of cameras on site by deploying IQeye megapixel cameras from IQinVision
High value storage sites in Washington belonging to Community Transit now have the ability to identify and investigate crime and suspicious behaviour after the installation of High Definition IP surveillance systems from Avigilon
