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AviRaw Description

Read raw webcam AVIs

What is the RAW modification? Essentially, it is a firmware modification that allows elimination of the usual in-camera processing that all webcams perform. Such processing causes loss of image resolution. With the RAW mod we can capture the information directly as seen by the CCD. But to use such RAW image information, we need special software. This is where AviRaw comes in. AviRaw can reconstruct the colour information in a way that does not cause so much image resolution loss, and it can convert the RAW avi into normal AVIs that can be processed by the well known processing programs (IRIS, K3CCDTools, Registax and several others).
Overview
AviRaw allows opening of an AVI and

* preview as ordinary RGB (decoded via codec as usual)
* preview as RAW luminosity (Y channel only) from ordinary or RAW captures
* preview as RAW colour, debayerized from Y channel (works only for RAW captures)
* save as new AVI using the selected mode (starting V2.3 this works also for Win9x)
* save as new BMPs (1 per frame) using the selected mode
* properly handle dropped frames for preview and save (dropped frames are not checked)
* Save individual R,G,B channel AVIs from normal or debayerized mode
* Check/uncheck frames in list and save only checked frames.

To use the RAW features, a Philips webcam format is assumed. AviRaw supports both Vesta and ToUcam style RAW cameras. Select one of the Vesta or ToUcam options in the toolbar combo box. This has been tested successfully on RAW Vesta and ToUcam cameras (both with colour CCD chips).

Meaning of BG, GB, RG and GR buttons
AviRaw decodes the so-called bayer-pattern in the images captured with RAW-modified colour webcams. It does this by by-passing the AVI codec that is normally used to create a colour image.

The CCD color sensors have small R,G,B filters over each pixel in order to be able to represent colour variation. Each pixel has only one colour (red, green or blue), and the layout of the filters is called the "bayer pattern".

When the RAW mod is applied, we can access the CCD data in software, almost unmodified by the electronics, and we then see the bayer filter pattern in the data we receive, some pixels must be understood as red, some as green and some as blue.

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