The difference between digital camera and digital video camera

The number of pixels in digital cameras is as high as millions, and the number of pixels in a single image of dynamic video is only a few hundred thousand, but dynamic video records dozens of frames every second, and the total amount of data is very huge.

The image processing chip of digital camera is specially designed for processing static pictures, and it is often a bit inadequate to process dynamic stream files, because the image processing chips of DC and DV are dedicated chips.

Its "high efficiency" comes from "functional specificity", so we should take into account two aspects, either using a processor with more powerful computing power or sacrificing processing efficiency. The former means expensive, while the latter means low energy consumption.

On the other hand, the huge amount of data requires huge storage space, so the mainstream DV still uses tape, because even if MPEG-4 format with high compression ratio is adopted, the 5 12MB memory card can only store high-precision video for more than ten minutes.

The first difficulty in using DV as DC is resolution. Because people's visual perception is different, the requirement for the accuracy of dynamic images is far lower than that of static images. Standard PAL and NTSC video signals.

If converted into pixels, the accuracy of a single picture is less than 300,000 pixels, and the VGA video signal (640x480,300,000 pixels) is already of high accuracy. Even for HDTV, the single picture is only 2 million pixels (1920x 1080 pixels), so the current mainstream DV is still 800,000 pixels.

As far as DC is concerned, the current 3-megapixel model has gradually withdrawn from the mainstream market, and household products have entered 5 million pixels.

2. The photoelectric system is different.

When taking a single photo, you can zoom in advance. Accuracy is the first requirement, and you can even give up a little speed for accuracy. When shooting dynamic images, zooming, focusing and image shooting are carried out at the same time, which requires the cooperation of photoelectric system to be not only accurate, but also fast and even more accurate.

Therefore, DC and DV have different requirements for the cooperation of photoelectric systems, so it is difficult to give consideration to both sides. Therefore, although many DCs can shoot video clips, they can't zoom in the middle of shooting, and many low-end models even lock the focus after the video starts.

3. Different uses

Digital cameras are generally used to organize still images, while digital cameras are generally used to record dynamic videos or pictures.

Extended data:

Digital camera is a kind of camera that uses electronic sensors to convert optical images into electronic data.

According to the use, it is divided into: SLR camera, micro camera, card camera, telephoto camera and household camera. The principle of digital camera recording images on film through silver bromide's chemical changes is different from that of ordinary cameras. The sensor of digital camera is photosensitive charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS).

Before an image is transmitted to a computer, it is usually stored in a digital storage device (usually using flash memory; Floppy disks and rewritable compact discs (CD-RW) are rarely used in digital camera equipment.

Digital video camera is a digital video format jointly developed by many famous home appliance giants. However, in most cases, DV stands for digital camera.

Baidu encyclopedia-digital camera

Baidu encyclopedia-digital camera