DIPlib Documentation - ©1995-2013 Quantitative Imaging Group, Delft University of Technology.

# Arith

arithmetic function

## SYNOPSIS

dip_Error dip_Arith ( in1, in2, out, op, dt )

## DATA TYPES

binary, integer, float, complex

## FUNCTION

This function computes `out` = `in1` `op` `in2` on a pixel by pixel basis. The data types of the `in1` and `in2` image may be of different types. `dt` may be any of DIPlib's data types, or the constants `DIP_DT_MINIMUM`, `DIP_DT_FLEX` or `DIP_DT_FLEXBIN`, and determines what the output data type will be. `DIP_DT_MINIMUM` selects a data type according to the default for dyadic operations, see Information about dyadic operations for more information. `DIP_DT_FLEX` will choose a floating point (real or complex) type, the precision depends on the input types. `DIP_DT_FLEXBIN` is the same as `DIP_DT_FLEX`, except that two binary inputs will produce a binary output.

## ARGUMENTS

Data type | Name | Description
`dip_Image` | `in1` | First input
`dip_Image` | `in2` | Second input
`dip_Image` | `out` | Output
`dipf_ArithOperation` | `op` | Dyadic arithmetic operation
`dip_DataType` | `dt` | Data type for output

The `dipf_ArithOperation` flag can be one of:

Name | Description
`DIP_ARITHOP_ADD` | Addition (`in1+in2`)
`DIP_ARITHOP_SUB` | Subtraction (`in1-in2`)
`DIP_ARITHOP_MUL` | Multiplication (`in1*in2`)
`DIP_ARITHOP_DIV` | Division (`in1/in2`)
`DIP_ARITHOP_MUL_CONJUGATE` | Conjugate multiplication (`in1*conj(in2)`)

For two binary inputs, and with `dt` = `DIP_DT_FLEXBIN`, the operations performed are equivalent to logical operations:

Name | Description
`DIP_ARITHOP_ADD` | `Or` (`in1|in2`)
`DIP_ARITHOP_SUB` | And not (`in1&!in2`)
`DIP_ARITHOP_MUL` | `And` (`in1&in2`)
`DIP_ARITHOP_DIV` | `Xor` (`in1^in2`)
`DIP_ARITHOP_MUL_CONJUGATE` | And (`in1&in2`)

## SEE ALSO

`Arith_ComplexSeparated`, `Add`, `Sub`, `Mul`, `Div`, `MulConjugate`, `AddInteger`, `AddFloat`, `AddComplex`, `SubInteger`, `SubFloat`, `SubComplex`, `MulInteger`, `MulFloat`, `MulComplex`, `MulConjugateComplex`, `DivInteger`, `DivFloat`, `DivComplex`