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5.8.1 Capture

This menu groups operations which are useful in capturing images, or for the inital processing you might want to do to an image captured from another program.

Capture Video Frame
This menu item will currently only work on Linux machines with a compatible video4linux capture card. See §3.2.1 for notes on how it works.

Smooth
Use this to remove texture from images. It's handy in conjunction with Flatfield.

Flatfield
Use this to correct homogeneity. Select an image of a piece of white (or mid-grey) card, then select the image to correct, then click Flatfield. Use Smooth to renmove texture from the white card if necessary.

You can select a single white and a group of images to correct a large set in one step

White Balance
Use this to move the white point to make an area of the image you know to be white, white. Mark a region on an image, enclosing a patch you know to be white. Select the region and the image and click on White Balance.

Find Colour Calibration
Use this to colour calibrate an image. Drag a region enclosing an image of a Macbeth Color Checker Chart and click Find Colour Calibration.

Apply Colour Calibration
Use this to apply the transform calculated by the previous item to another image. Select the calibration object, select the RGB image you want calibrated, and click Apply Colour Calibration.


next up previous contents
Next: 5.8.2 Mosaic Up: 5.8 Tasks Previous: 5.8 Tasks   Contents
John Cupitt 2004-12-20