Visualizer functions

Auto Focus (or AF)

This is a common feature found on most visualizers. The subject being viewed is automatically focused to the correct focus instead of an individually focusing manually. Most systems continuously maintain the focus, adjusting for any difference throughout the presentation

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Auto Iris

This is an automatic process which controls the amount of light being picked up by the image. This feature effects the darkening or lightning of the image which can be useful when environments are either too light or too dark.

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Colour / Black & White Selection
Colour / Black & White Selection

This feature converts a color picture to a black and white one. "Noise" can often occur in color pictures and this feature is to help eradicate the "noise" of the picture. When this feature is used, the image is more stable and white and dark are easier to define.

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Digital Magnification

This feature provides additional magnification to the optical magnification. Depending on the model, magnification of up to 300 times can be achieved.

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Drawing Function

This feature enables the presenter to draw or annotate directly over the document being viewed. The annotation is done using "electronic ink" which can come in many colors for different types of emphasis.

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Edge Enhancement

A "halo" effect can sometimes be caused on images such as black text on white; this feature helps to eliminate this from occurring.

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External Image Save

Apart from the memory which is provided in the visualizer itself for storing your images, you can use a USB cord to transfer the images to your computer for extra storage or use a SD Card for additional memory.

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Gamma Correction

By coding or decoding luminance in video this function helps to optimize the image.

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Image Mode

These modes are a set of image enhancement algorithms designed for use depending on the type of subject you are viewing. For example, one of these modes can be used to diminish the "halo" effect created by a high contrast image.

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Image Rotation

This is a digital function in which the subject being viewed can be digitally turned 90 degrees at a time without physically moving the subject material.

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Internal Image Save

The majority of visualizers have on-board memory to store images. The memory capacity varies from model to model but y ou can store anywhere from 3 up to 80 images for easy retrieval.

Keypad lock

Locks the keypad to prevent an undesired selection of a control feature. Usually selected by a combination of buttons.

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Negative Positive Conversion
fig1. Negative Positive Conversion

This feature allows color and black and white images to be converted from positive images to negative images and vice versa.

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Pause / Freeze Mode

This feature allows the presenter to freeze the image last seen on the visualizer allowing the presenter to remove the previous subject with a new one without any disruption in the flow of the presentation.

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Projector control

Functions of the display device can be controlled by the visualizer. . This usually involves RS-232 or USB.

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Screen split

When comparing images this function can be extremely helpful. The screen is split 50/50 either vertically or horizontally. For example a live image can be displayed with a stored image.

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Signal Pass-through

The signal from your computer can pass through the visualizer (even when turned off) to the computer and the image from your computer can be shown on the display device

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Slide Show

Displays sequential images from either internal or external memory sources.

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Split Display / Slideshow

This feature is associated with image memory, either external or internal. In this feature you can display numerous thumbnail images stored in the memory. The number of images you can display varies from different models, but it can be from 4 to 16 images.

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State Presetting

This feature memories default settings for a particular presenter or function (viewing document, object etc...) It can memorize zoom, image rotation, color balance, white balance, brightness, lighting, edge enhancement, gamma, positive/negative and B&W selection.

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White Balance

This feature manipulates the color temperature seen by the camera, thus giving the right color image on the screen.

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