Label: DV
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Digital video camera is DV, DV is the abbreviation of DigitalVideo, translated into Chinese means "digital video", it is by Sony (SONY), Panasonic (PANASONIC), JVC (victory), Sharp (SHARP), Toshiba (TOSHIBA) and Canon (CANON) and other famous home appliances giants jointly developed a digital video format. However, in most cases DV stands for digital video cameras.
Characteristics
High definition We know that the analog camera records the analog signal, so the image resolution (also called resolution, resolution or resolution) is not high. For example, the level of the VHS camera is clearly 240 lines, preferably the Hi8 machine. The model is also only 400 lines. The DV records digital signals, and its horizontal resolution has reached 500~540 lines, which is comparable to professional cameras.
The more pure color DV's chrominance and luminance signal bandwidth is almost 6 times that of analog cameras, and the chromaticity and brightness bandwidth are one of the most important factors determining the image quality. Therefore, the color of the image captured by DV is more pure and beautiful. Achieved the level of professional cameras.
The signals recorded on the lossless copy DV tape can be transcribed innumerable times, and the image quality will not drop at all, which is beyond the reach of analog cameras.
Advantage
Compared with the analog camera, the volume of the DV machine is greatly reduced, generally only 123mm × 87mm × 66mm, and the weight is greatly reduced, generally only about 500 grams.
Precautions
1. Image quality is a very important technical indicator when purchasing. Refers to the resolution of the image taken by the camera, measured by horizontal resolution. The more lines, the clearer the image.
2. Zoom performance represents the flexibility of the camera and is another important indicator. The optical zoom is zoomed by changing the focal length of the lens. It is better. The larger the magnification, the better. Generally, the magnification of the optical zoom is between several times and 20 times. Some models can also increase the magnification of the optical zoom through the multiplier. .
3. How much function is also an important indicator for purchasing a camera. In addition to the necessary functions such as clock setting and various operation settings, there are also screen effects, digital editing, faders, etc., which are almost necessary for various types of cameras.
Digital video camera - working principle
HV30 appearance
The basic principle of working digital cameras is simply the transformation and transmission of optical-electrical-digital signals. That is, the light signal is converted into a current by the photosensitive element, and then the analog electric signal is converted into a digital signal, and the information obtained by the special chip for processing and filtering is restored as the dynamic picture we see.
The photosensitive element of a digital video camera can convert light into electric charge and convert it into digital signal through an analog-to-digital converter chip. There are two main types: one is a widely used CCD (charge-coupled) component; the other is CMOS (complementary metal). Oxide conductor) device.
classification
First, according to the purpose of use
1. Guangbo-class models:
These models are mainly used in the field of broadcast television. The image quality is high and the performance is comprehensive, but the price is higher and the volume is larger. They have the highest definition, the highest signal-to-noise ratio and the best image quality.
Of course, the price of several hundred thousand yuan is not acceptable to the average person. For example, Panasonic's DVCPRO50M and above models.
2, professional-grade models:
These types of models are generally used in professional TV fields other than broadcast television, such as e-education, etc. The image quality is lower than that of broadcast cameras. However, in recent years, some high-end professional cameras have surpassed the broadcast models of the old models in many aspects such as performance indicators. Cameras, the price is generally between tens of thousands and hundreds of thousands of yuan.
Compared with consumer models, professional DVs are not only more cool, but also more eye-catching, and they are much higher in configuration. For example, lenses with better quality performance and larger CCD size are used in imaging. Quality and adaptability are more prominent. For those who are pursuing image quality, the surprises of image quality improvement are not measured by money. Representative models such as Sony's DVCAM series models.
3. Consumer models:
These models are mainly suitable for home use cameras, and are used in non-business situations where image quality is not high, such as home entertainment. These cameras are small in size, light in weight, easy to carry, simple to operate, and inexpensive. It can be used to make VCDs and DVDs for individual families in places where the requirements are not high. The price is usually in the range of thousands to 10,000 yuan.
If you classify your home digital cameras, you can roughly divide them into the following categories: entry DV, mid-end consumer-grade DV, and high-end quasi-professional DV products.
Second, according to storage media classification
1, tape type:
Refers to the digital video camera with MiniDV as the recording medium. It was first developed in 1994 by more than 10 manufacturers. Record high quality digital video signals with 1/4 inch metal evaporation.
2, CD-ROM:
Refers to the DVD digital video camera, the storage medium is DVD-R, DVR+R, or DVD-RW, DVD+RW to store dynamic video images, easy to operate, easy to carry, no need to worry about overlapping shooting during shooting, not to waste Time to rewind or play back, especially when played directly through the DVD player, eliminating the hassle of post-editing.
DVD media is the most secure and stable of all current media digital camcorders. It is not as easy to lose as tape DV, nor is it very demanding for shockproofing like hard disk DV. The downside is that the price of a DVD disc is slightly higher than that of a tape DV, and the recordable time is relatively short.
3, hard disk type:
Refers to a digital video camera that uses a hard disk as a storage medium. 2005 was first introduced by JVC, using a micro hard disk as a storage medium.
Hard disk cameras have many advantages, and large-capacity hard disk cameras ensure long-time shooting, so you don't have any worries when you travel. When you return home and transfer the shooting material to your computer, you don't need the cumbersome and professional video capture equipment of the MiniDV tape camera era. You only need to connect the USB cable to the computer to easily export the material, so that ordinary home users can easily experience it. The fun of shooting and editing video movies.
The size of the micro hard disk is the same as that of the CF card, and it is smaller than the DVD disc. It is also the most versatile in many storage media. However, due to the short time of the hard disk DV, there are still many shortcomings. : such as poor shock resistance and so on.
With the further decline in prices, the number of people in the future will inevitably increase.
4, memory card type:
It refers to a digital video camera that uses a memory card as a storage medium. For example, the popular "X easy to shoot" product, as a transitional simple product, is rarely seen on the market today.
Third, according to the type and number of sensors
1, sensor type: CMOS and CCD
CCD: Charge Coupled Device, made of a high-sensitivity semiconductor material that converts light into electrical charge and converts it into a digital signal through an analog-to-digital converter chip.
CMOS: Complementary Metal-Oxide Semiconductor, like CCD, is a semiconductor that can record light changes in digital video cameras.
At the same resolution, CMOS is cheaper than CCD, but the quality of the image produced by CMOS devices is lower than that of CCD. So far, most of the consumer level and high-end digital cameras on the market use CCD as a sensor; CMOS sensors are used as low-end products on some cameras, but some high-end products also use special CMOS as light. Sensors, such as Sony's several high-end CMOS models.
2, the number of sensors: single CCD and 3CCD
The number of image sensors is the number of digital camera CCD or CMOS. Most digital cameras use a single CCD as their light-sensing device, while some high-end digital cameras use 3CCD as their light-sensing device.
A single CCD refers to a photoelectric conversion of a luminance signal and a color signal using only one CCD in the camera. Since one CCD simultaneously converts the luminance signal and the chrominance signal, the captured image does not meet the high requirements for color reproduction.
3CCD, as its name suggests, is a camera that uses three CCDs. We know that if light passes through a special prism, it will be divided into three colors: red, green and blue. These three colors are the three primary colors used by our TV. Through these three primary colors, we can generate the brightness signal. All TV signals inside. If each color is received by a CCD and converted into an electrical signal, and then processed by the circuit to generate an image signal, thus a 3CCD system is formed, and the primary color of the image can be displayed almost intact, without passing through the camera. Deductive and color error occurs.
China's digital camera market development prospects
In 2008, in the global economic downturn, the market demand for many digital products was greatly challenged. However, from the perspective of the development of China's digital video camera market, the overall growth momentum is relatively strong. Various manufacturers are paying more and more attention to the development of the digital video camera market, and the highlights of product structure changes, price bottoming, and promotion form innovations are frequently emerging. The digital video camera market in 2008 was very lively and thought-provoking.
At the same time as the development of digital cameras in China, some problems have become increasingly apparent. However, due to the huge potential consumer groups, it is still the most likely to become the largest consumer market for digital cameras.
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