Image Arithmetic and Logical Operations

Intel IPP provides functions that modify pixel values of an image buffer using arithmetic or logical operations. It also includes functions that perform image compositing based on opacity (alpha-blending).

Table Arithmetic and Logical Operations lists the functions:

Arithmetic and Logical Functions
Function Base Name	Operation
Arithmetic Functions
Add	Adds pixel values of two image buffers
AddC	Adds a constant to pixel values of an image buffer
AddSquare	Adds squared pixel values of a source image to floating-point pixel values of an accumulator image
AddProduct	Adds product of pixel values of two source images to floating-point pixel values of an accumulator image
AddWeighted	Adds pixel values of a source image multiplied by factor α to floating-point pixel values of an accumulator image multiplied by factor (1-α)
Mul	Multiplies pixel values of two image buffers
MulC	Multiplies pixel values of an image buffer by a constant
MulScale	Multiplies pixel values of two image buffers and scales the products
MulCScale	Multiplies pixel values of an image buffer by a constant and scales the products
Sub	Subtracts pixel values of two image buffers
SubC	Subtracts a constant from pixel values of an image buffer
Div	Divides pixel values of two image buffers
Div_Round	Divides pixel values of an image by pixel values of another image with different rounding modes
DivC	Divides pixel values of an image buffer by a constant
Abs	Computes absolute pixel values of a source image and places them into the destination image
AbsDiff	Finds the absolute difference between two images.
AbsDiffC	Finds the absolute difference between an image and a scalar value.
Sqr	Squares pixel values of an image and writes them into the destination image
Sqrt	Computes square roots of pixel values of a source image and writes them into the destination image
Ln	Computes the natural logarithm of pixel values in a source image and writes the results into the destination image
Exp	Computes the exponential of pixel values in a source image and writes the results into the destination image
Complement	Converts negative number from the complement to direct code.
DotProd	Computes the dot product of pixel values of two source images.
DotProdCol	Calculates the dot product of taps vector and columns of the specified set of rows.
Logical Functions
And	Combines corresponding pixels of two image buffers by a bitwise AND operation.
AndC	Performs a bitwise AND operation on each pixel with a constant.
Or	Combines corresponding pixels of two image buffers by a bitwise OR operation.
OrC	Performs a bitwise OR operation on each pixel with a constant.
Xor	Combines corresponding pixels of two image buffers by a bitwise XOR operation.
XorC	Performs a bitwise OR operation on each pixel with a constant.
Not	Performs a bitwise NOT operation on each pixel
RShiftC	Divides pixel values by a constant power of 2 by shifting bits logically or arithmetically to the right.
LShiftC	Shifts bits in pixel values to the left.
Alpha-Blending Functions
AlphaComp	Combines two image buffers using alpha (opacity) values.
AlphaCompC	Combines two image buffers using constant alpha values
AlphaPremul	Pre-multiplies pixel values of an image buffer by its alpha values.
AlphaPremulC	Pre-multiplies pixel values of an image buffer using constant alpha values.

An additional suffix C, if present in the function name, indicates operation with a constant. Arithmetic functions that operate on integer data perform fixed scaling of the internally computed results. In case of overflow the result value is saturated to the destination data type range.

Note

Most arithmetic and logical functions support data with 1-,3-, or 4-channel pixel values. In the alpha channel case (AC4), the alpha channels are not processed.

Many solutions and hints for use of these functions can be found in Intel IPP Samples. See Intel® IPP Image Processing and Media Processing Samples downloadable from http://www.intel.com/cd/software/products/asmo-na/eng/220046.htm .