Zoom: Optical or Digital?
Optical zoom is implemented by a mechanical assembly of optics (i.e. lens) with adjustable focal length, yet digital zoom only crops the photo and enlarges it to the normal size which can be done later by any photo editing software such as Photoshop. Therefore, optical zoom provides better quality than digital one.
Image Sensor: CCD or CMOS?
An image sensor is a device that captures light and converts it into electronic signals for digital processing. Most digital cameras today apply either CCD or CMOS image sensor. With the superior integration ability with signal processing features, CMOS sensors can provide faster readouts with less space and power whereas CCD sensors have relatively mature technology which offers better image quality and less noise for high-end applications.
FOV (Field of View)
FOV is the extent or range of observable image seen by a camera at any given time. It can be measured across the frame’s diagonal or along its horizontal/vertical plane. Generally, the horizontal FOV for humans is nearly 180° and around 135° in vertical.
PTZ (Pan-Tilt-Zoom) Camera
PTZ stands for three movements of camera, pan, tilt and zoom, which can be controlled remotely from a computer.
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Video resolution is the number of pixels that can be displayed horizontally and vertically. For example, Full HD 1080p (1920 x 1080) means the width is 1920 pixels and the height is 1080 pixels with progressive scan (p-scan) which all the 1080 horizontal lines are drawn sequentially. Compared to interlaced scan, p-scan requires wider bandwidth in order to provide smoother and clearer results.
The ratio of the width to the height of an image is known as aspect ratio. The most common aspect ratios in display screen are 4:3 and 16:9. The problem may occur when the input video resolution cannot match the display resolution of screen. Try to adjust the display resolution of your screen to get an appropriate display size for video conferencing.
AVer video conferencing systems allow you to input video source from HDMI or DVI, and share your content via VGA at the same time.
Frame Rate (Frames per second, fps)
Frame rate is the number of frames that are displayed per second by imaging devices. The higher it is, the smoother the video appears to viewers, but there is no noticeable difference for frame rates above 30 in video conferencing. AVer video conferencing systems support all people video resolutions at 30 fps and content video resolutions up to 30 fps depending on the network bandwidth.
Three major techniques in audio signal processing are Automatic Gain Control (AGC), Advanced Noise Reduction and Acoustic Echo Cancellation (AEC). AVer's scalable microphone array performs all these functions and the daisy chain can be cascaded up to 4 microphones in a series. Our codec also supports 3.5 mm line-in cable for audio input from an external microphone.