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[Works] The digital camera is the product of the set of optical, mechanical, and electronic integration. It integrates image information conversion, storage, and transmission components, with digital access mode, and interactive computer processing and real-time shooting. Light to enter the camera through the lens or lens group by the transformation of imaging devices for digital signal, digital signal stored in the storage device through the image computing chips. The imaging component of the digital camera is the CCD or CMOS, the components of the imaging characteristics of the light through, according to the light conversion electrical signals. Digital cameras first appeared in the United States ========================== [Imaging process A. Light is focused through the lens on the CCD or CMOS Two. CCD or CMOS to convert light into electrical signals 3. Processor, processing, recording on the camera's memory 4. Will form the image by computer processing and display of electro-optical conversion, or by the printer to print. Specific process: Digital camera through the optical system to focus the image in the imaging element on the CCD / CMOS, each pixel on the optical signal into a digital signal by A / D converter and DSP processing into digital images, stored in the storage medium. Light from the lens into the camera, CCD conduct the color filter, light-sensitive (photoelectric conversion), according to a certain arrangement of the shooting object "decomposition" has become a one pixel, these pixels in the form of the analog image signal transferred to the modulus converter "to convert the digital signal sent to the image processor to deal with a real image, after compression stored in the storage medium. ========================== [Excellent point] 1, after taking pictures can immediately see the picture, thus providing the possibility of a remake not satisfied with the work immediately, reducing regret the occurrence. 2, pay only for those who want to wash the photo, you can delete unwanted pictures. 3, the color reproduction and color range is no longer dependent on the quality of the film. 4, the sensitivity is no longer due to the film and fixed, the photoelectric converter chip offers a variety of sensitivity options. ========================== [Disadvantages] 1, the conversion of imaging devices and image processing chip, the image quality compared to optical cameras lack of layering. 2, due to the various manufacturers of image processing chip technology, imaging images that show the color and the actual objects the difference. 3, post-use maintenance cost is higher. ========================== [Sub class] By end-use SLR camera / card camera / telephoto camera / home camera ========================== [Data storage] Digital cameras, audio and video storage format to the following categories. ---------------- 1, [AVI - file format] Extension. AVI video format, it can be said is one of the earliest popularization specifications. AVI format is not compressed, so few tens of seconds of AVI video files often need to 5 to 8MB of storage space. Plus, due to the factory without a complete set of specifications to use the AVI format and single each their own interpretation of the specifications at least there is more than more than one hundred kinds. Although popular audio and video playback software, such as: WINDVD, POWERDVD even AcdSee 3R-1 and other known can play up to 60% to 70% or more of the AVI file. However, the current situation, MicroSoft Mediea Player 8.0 is compatible with the best AVI audio and video playback software. Is currently the most common dynamic image format. ---------------- 2, [MOV - file format] MOV is one of the animation format of most digital camera manufacturers most commonly adopted. The main reason lies in its concise compression technology to provide users well in the low resolution video choice ---------------- 3, [Motion JPEG - AVI file format] JPEG used in full-color image compression technology, the DCT, the less important part in the image data removal standard, unique distortion, effectively reducing the file size. Animation playback capability and JPEG-phase combination, known as MJPEG stands for Motion JPEG. Their storage extension is still used AVI to cope with the playback software compatibility. Digital camera for this image specifications share small memory capacity, many do not support synchronization with the audio function ---------------- 4, [MPG - file format] As VCD is becoming increasingly popular, even with the MPEG-1 technology were just to promote them. Although only a very small part of the digital camera to support this specification animation recording. Combined with professional CCD lens coupled with the animation techniques of synthesis results, compared with DV almost favorably. Of MPEG Moving Picture Experts Group, belonging to the ISO / IEC standards (International Standards Organization and International Electrotechnical Association) one. Player decoding, MPEG-1 technology enables a long period of electronic images can be made to fast forward, rewind and even choose the point in time these actions. The recorded files to MPG, can also directly burn to VCD, VCD PLAYER to watch. ---------------- 5, [ASF - file format] The introduction of MPEG-1, at least for the computer world, the two revolutionary recording long electronic animation files, one has a search function, and the other is completely avoided. MP3 music. The ASF format is part of the image using the latest MPEG4 compression, the sound part is converted to its own R & D in WMA format (WMA stressed compression than MP3 are still twice the sound quality similar to MP3, plus WMA confidentiality clause and design the right to use get files like MP3 easily be copied.) In order to avoid copyright disputes WMA audio, the industry has a switch to standard MP3 DIVX video format. DIVX compressed images in MPEG4, MP3 compressed audio, and stored in the AVI file format! . However, due to play DIVX video files specifications necessary to download the DIVX CODEC, and DIVX playback system resource requirements is quite high. ---------------- 6, [RM - file format] RealVideo is a real-time playback software developed by RealNetworks specifically for online video, web page creators can provide real-time audio-visual programs on the site. Similarly, the Developed by RealNetworks, RealAudio, on the site to provide real-time playback of sound. Users to the following website to find a free download of RealPlayer software and information. In addition, RM also can be played directly online Stream Line, instead of the entire audio and video files to download. However, due to poor RM quality shortcomings are not an effective solution, currently on the market did not support RM recorded format digital camera. ---------------- 7, [GIF - animation format] GIF, strictly speaking, can only be considered a dynamic picture display format. Color only support 256-color gradation, not recording. The standard specification is divided into two kinds of GIF87a and GIF89a, GIF89a has a transparent background and animation playback capability. ========================== The main accessories -------------- 1, UV lens] Excess UV filter in the air, at the same time play the role of protecting the lens. Selected should be noted that on the surface of the UV mirror coating, in particular, is shaking under a bright light when we see colorful color through light performance is very good lens on the front of that there is a can not see to the feel of the lens. Tens of dollars on lenses strictly speaking is not a UV lens (and called to protect the mirror), First lens coating (no coating would be no more than one function in the uv mirror, just play to protect the lens to prevent the lens from falling ash role), put to the lens, like the addition of a high-grade glass. The imaging results have actually not as good as without the lens. -------------- 2, LCD protective film Play the role of the LCD screen scratches to prevent use of the protective film: electrostatic adsorption on the surface of the LCD screen, a long time, the protective film to scratch the surface the more serious the timely replacement of the surface of the LCD screen does not corrosion. -------------- 3, the gas blowing] Clean-up lens and camera dust on the surface, but when clean-up must pay attention to the blowing head and some distance away from the lens to blow through the palm of the instantaneous force (This will ensure that the blowing head does not touch the lens to not pay attention to, resulting in lens scratches.) -------------- 4, lens cloth] Should tie in with the air blowing mouth to blow the floating dust on the lens, in order to avoid the lens above the stained saliva (especially just after eating something greasy to use, wipe the lens can not be the lens above, once stained with greasy saliva bad wipe. -------------- 5, camera bag] First, the choice of camera bags to choose the performance (that is, to buy bags to do with) such as: rain, shock, dust, fire, and so on. ==========================
【Article is excerpted from: Baidu Encyclopedia】 |
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来自： LOFT生活 > 《Home Topics》
