Synchronization: internal synchronization
The modern CCD camera, most of them adopt adjustable phase method to lock the synchronization, named AC power frequency (50Hz) as the reference value which is used for vertical synchronization, instead of the camera`s synchronous generator. When switching the camera output,the image unit scrolls,it will not cause picture distortion. In addition, it has phase control (±90%) for external adjustment, so it can get a very accurate synchronization. Adopting internal synchronization method can make the pictures more smooth and clear.
Horizontal resolution and vertical resolution
â— the visualizer with the function which can display a variety of slides,models,transparent films,presentations or other objects on the projection screen clearly and vividly through the camera.
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TV system: PAL system
so far, the broadcast system in the world mainly use PAL,NTSC, SECAM. China always uses PAL, Japan, South Korea use NTSC, Russia uses SECAM. There are two scanning system,PAL-B and NTSC. Visualizer adopts PAL system or SECAM.
the vertical resolution is the image can be decomposed how many number of horizontal lines,the maximum vertical resolution is subject to the total number of rows from the vertical scanning. Horizontal resolution is the number of vertical lines from the image which can be distinguished. The horizontal resolution and the number of pixels of image sensor has the direct relationship between the bandwidth of video system. The horizontal resolution and vertical resolution adopt unified metrics,. So when the interval of horizontal line and vertical line on the screen are the same, the number of vertical resolution and horizontal resolution on the screen should be the same. The bigger the value of horizontal resolution and vertical resolution is, the higher resolution is. The horizontal resolution of our visualizer is up to 470 TV lines,vertical resolution is up to 380 TV lines.
Effective pixels : 737(H)*535(H)
the effective pixels of the visualizer has the direct relationship with the CCD. Most of digital cameras and video camera recorders all adopt CCD as the sensitive components, for the total pixels,it means the total number of all the pixels in the CCD. This is also a standard for dividing product level. But in practice,not all pixels are photosensitive,because the pixels near the edge portion will be covered,for providing complete black signal,as a basis of image. The left are the official pixels to sense the image,it is so-called effective pixels.
â— Visual Presenter is a official name for domestic and foreign market. In China,it is also called physical showcase,physical demonstrator,physical projector,visualizer, in foreign market, it is also called document camera. From the function, we make the definition for the visualizer below: the visualizer, is a presentation equipment, which is through CCD camera,and based on photoelectric conversion technology,to make the information like objects, presentations,pictures convert to image signals and output and show on the display devices like projector,camera.
â— in the traditional working,meeting and teaching activities,people always use slides in the past.but after the emergency of visualizer,and which combines with projector perfectly,it is gradually replacing the traditional slides,its application is far beyond the traditional slides.
â— so far,the visualizer is widely used in the teaching area,training activities,videoconferencing,seminars and other occasions, it has multi-function like demonstrating presentations,commodities,components,three-dimensional objects,but the main users are from education industry.
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