3MP camera means 3 megapixel camera, MP stands for megapixel for digital cameras.

1999 was the year that compact digital cameras crossed over to 2 megapixels. The world's major camera manufacturers put well over a hundred digital cameras on the market in just over a year.

such as Canon PowerShotS10, Kodak DC280, DC290Zoom, Fuji MX-2700, MX-2900Zoom, PrintCamPR21, Nikon Coolpix700, Coolpix800, Coo1pix950 are all 2MP (MP stands for megapixel) compact digital cameras.

Entering the year 2000, the hotspot shifted to the 3-megapixel class (3MP), and in October 2000 Olympus launched the CAMEDIAE-10 4x optical zoom popular digital camera with a total pixel count of 4 megapixels.

Expanded Information:

The history of the digital camera dates back to the 1940s and 1950s, when in 1951 Bing Crosby Laboratories invented the videotape recorder (VTR), a new machine that could record current impulses from television broadcasts onto magnetic tape. By 1956, VCRs were in mass production. It is seen as electronic imaging technology produced.

In the 1960s NASA had to survey the surface of the moon before astronauts could be sent there. However, engineers found that the analog signals transmitted back from the rover were so weak, caught among other rays in the universe, that receivers on the ground couldn't turn the signals into clear images.

The engineers had to find another way. After that, digital imaging technology evolved even faster, thanks in large part to technological competition during the Cold War. And these technologies were also used primarily in the military, with most spy satellites using digital imaging technology.

In 1969, George Smith and Willard Boyle of Bell Labs combined videophones and semiconductor bubble storage technology to design a "charge 'bubble' device" (Charge 'bubble' device) that allowed a digital camera to conduct a charge along a semiconductor surface. "

Willard Boyle combined videophones and semiconductor bubble storage technology to design "Charge 'Bubble' Devices" that allowed digital cameras to conduct charges along the surface of semiconductors, pioneering the invention of prototype CCD devices.

At the time, CCDs were invented to improve storage technology, and the components themselves were used as mere memory. It was then recognized that CCDs could use the photoelectric effect to capture and store images.

Baidu Encyclopedia-Digital Camera