Correcting Non-Uniform Illumination

 

Objective

Following this tutorial, you will learn how to use EasyImage to correct non-uniform illumination in an image.

You'll need first to load an image (step 1), load a light reference image (step 2), and perform the correction (step 3).

    

Source image, with non-uniform illumination (left) and corrected image (right)

Step 1: Load the source image

1.

From the main menu, click EasyImage, then Uniformize.

2.

Click the Open icon of the Source Image area, and load the image file EasyImage\Board (original).tif.

3.

Keep the default variable name for the new image object, and click OK.

Step 2: Load the reference image

1.

Click the Open icon of the Light Reference area, and load the image file EasyImage\Board (light reference).tif.

To obtain the light reference image, we used a white screen illuminated in the same condition as the board (original image).

2.

Keep the default variable name for the new image object, and click OK.

Step 3: Perform the correction

1.

Click the New icon in the Destination Image area to create a new destination image.

2.

Keep the default values and click OK.

3.

Click Execute to perform the operation.

4.

In both source and destination images, right-click and select 3D Rendering.

5.

In the new 3D windows, click and drag the mouse to rotate the view. Compare the profiles.