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With scientific and technological progress and development, digital video cameras are constantly engaged in innovation and improvement. Ask for the readers, the paper briefly several digital camcorders using the new technology.

First, electronic image stabilization technology

High-end professional video cameras use more optical anti-shake system, which is shaken by a video camera light sensor to detect the prism, the use of floating lens elements of the stability of the results.battery for SONY NP-FH100 The optical image stabilization system, the high price and bulky, so hard to use a small digital video camera. For small digital video camera manufacturers have opened up a new electronic image stabilization technology. Early electronic image stabilization technology is the CCD output jitter of the video signal, stored in the video field memory, and then change the memory address, new address to re-read by the video signal, thus eliminating the image jitter.ACER Aspire 5735Z Battery This memory type of electronic image stabilization technology, memory size drawback is the large field, it is not appropriate for small palm-sized camcorder. Electronic image stabilization system uses a new generation of large CCD optical coupling devices, such as enlarging the area to increase the scanning line, and then take the middle part of the main scan image, the other anti-shake around the image is produced as a motion space, so as to achieve a good image stabilization effect. Some are also used to detect signals from the video images of the jitter, in accordance with the elimination of jitter to control the CCD scan range, to obtain a stable image.

Second, the zoom microphone technology

Photographers have such experience, when the lens from the distant past into a figure is difficult to pack to take to the loud, clear voice. This is because most non-professional cameras are using a relatively large angle, then the microphone. Professional video camera from the video camera interview with the characters than the distance,price of PANASONIC cga-du21 battery they often point to the microphone from the video camera connected, but the price of several thousand points the microphone, apparently low-grade video camera configuration uneconomical.

Therefore, camera manufacturers have introduced some new small video camera to use the zoom microphone technology. Zoom microphone works Simply put, that is, with the zoom lens cameras installed on the synchronization point of the variable width of the microphones pick up sound, this mic with the camera lens into the near distance, while controlling the microphone wide range of sounds picked up by the narrow, more focused recording distant sound of a single target, as if the voice of a target distance from the light to the ring, it seems that the photographer close to the target gradually.

Third, the backlight compensation shooting

Shooting in the snow, the beach in bright sunlight shooting in the background wearing a shiny silk or synthetic fiber sewn clothing figures of the shooting, and shooting to the background behind the bright light or when shooting people, professional camera Teachers often use manual aperture adjustment, auto iris shot in the backlight can not make a clear contrast of the right of the main characters. Taking into account the film’s fast, easy operation, many new cameras designed and installed the backlight compensation function. Backlight compensation is usually shot in the video camera set BLC (BACK LIGHT) key to start the shooting in backlit keys larger than normal to control the aperture, so that in the backlight of the characters, scenery clear, bright.

Fourth, infrared night vision technology

Environment in the whole shoot dark,SONY PCGA-BP2NX battery eyes can not tell who shot the scene with the character, professional camera batteries often have to bring the students with the flash. Dark environment to facilitate the shooting, the camera manufacturers have to infrared radiation technology applications in the video machine. Camcorder in dim environment at the chance to launch out of a red line of the beam to illuminate the scene and characters, so that cameras capture clearer pictures. Of course, image quality is not perfect, and some video cameras with the use of slow shutter switch, image quality will improve more.

Five, black and black compression expansion

This camera technology is the only increase black extension detail and dark gray levels, without affecting the light at the image; and black compression is only to improve the contrast of the dark, without affecting the light at the image contrast. Compression black contrast only 40% lower than the signal level impact,TOSHIBA PA3479U-1BRS laptop battery and high contrast of 40% for the signal level had no effect. As digital video cameras using digital signal processing LSI DPS, so the black for the black expansion and compression of the parts operation accurately, fast and effective. Taking into account the digital television signal quantization noise, black expansion circuit for increasing the number of cameras increase the quantization bits better.

VI, CCD’s defect compensation

Appear in the screen shot of small needle-like dark spots, white spots, or the vertical bright line (IT-type CCD has been expressed in the entire field of bright lines, FIT type CCD is common for the half-light line), in general, is Because the defects caused by CCD.

Whether a digital camera or digital video cameras are used in hopes photosensitive optoelectronic device CCD defect better, but the CCD manufacturing process is very difficult to completely defect, CCD pixels in the course of the individual defect caused damage to failure are inevitable. Therefore, the defect compensation for CCD operation for us.APPLE A1189 battery The CCD digital video camera called the defect compensation circuit LPC (Leaking Pixel Correction). CCD video camera in it and the surrounding pixels with each pixel in the other two to compare the corresponding pixels, a pixel signal when that failed, they use instead of the average of surrounding pixels, thus overcoming the image quality of CCD defects degradation.

Professional grade video cameras for the factory detected CCD defects, by identifying the location, and then written to a ROM (usually on the ROM component of the NR-board CCD camera), and finally read out by controlling the CCD clock shield out defects.

Often by the laser beam according to the CCD light-sensitive device to generate defects, so the camcorder used, especially in order to render the atmosphere and stage performances by shaking when the laser shot, the filter should be installed to prevent a particular video Machine CCD defect caused burns.