20.8.5 Image Arithmetic Processing

Image-Arithmetic-Proc

Simple Math

Apply simple math operation on a single image or between two images. Math operation can be performed on all RGB channels or a specified channel. The available math operations between two images are: Add, Subtract, Multiply, Divide, AND, OR, XOR, Abs Difference, Min, Max. For a single image, there are five additional operations available: Square Root, Square, Log, Sin, Cos.

To use this filter, select menu ...Simple Math. To learn each option in the dialog and the example of the output image, please see documentation provided for X function cvMath.

Alpha Blend

Used to adjust the transparency of the source image. Apply a mask matrix of source image dimension to the source image using alpha blending as illustrated in equation below:

where ranges from 0 to 1, SourceImage is the source image, ReferenceMatrix is the mask matrix with all elements equal to 255 (opaque) and New Image is the alpha blended image.

To use this filter, select menu ...Alpha Blend. To learn each option in the dialog and the example of the output image, please see documentation provided for X function cvAlpha.

Subtract Background

Detects and removes background from the image.

To use this filter, select menu ...Subtract Background. To learn each option in the dialog and the example of the output image, please see documentation provided for X function cvSubBg.