LBitmap::MathFunction

#include "ltwrappr.h"

virtual L_INT LBitmap::MathFunction (uMType, uFactor, uFlags = 0)

L_UINT uMType;

/* determines the manipulation function */

L_UINT uFactor;

/* amplitude or frequency Factor */

L_UINT32 uFlags;

/* flags */

Re-maps the image colors according to a mathematical function such as: square, log, square root, sine and cosine.

Parameter

Description

uMType

Value that represents the function to be applied. Possible values are:

 

Value

Meaning

 

MF_SQR

[0] Square the values.

 

MF_LOG

[1] Take the log of the values.

 

MF_SQRT

[2] Take the square root of the values.

 

MF_SIN

[3] Take the sine of the values.

 

MF_COS

[4] Take the cosine of the values.

uFactor

Factor used as an Amplitude factor when squaring, taking the log of or taking the square root of the color values and as a Frequency factor when taking the sine or cosine of the color values. The value of uFactor is divided internally by different amounts, according to the type of the function being used. These amounts are as follows:

 

If uMType is set to:

then the uFactor will be divided by:

 

MF_SQR

10000 internally

 

MF_LOG

10 internally

 

MF_SQRT

10 internally

 

MF_SIN

100 internally

 

MF_COS

100 internally

uFlags

Reserved for future use. Must be 0.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function uses the RGB color space.

This function makes it possible to apply one of five mathematical functions to a bitmaps pixel values: square, square root, log, sine and cosine.

Select the mathematical operation to be performed on each pixels values with the uMType parameter. The resulting values are multiplied by the factor uFactor. The uFactor parameter can be any value greater than 0. It is divided internally by different amounts, according to the type of the function being used.

If the bitmap has a region, the effect will be applied on the region only.

Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGCLR

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:

LBitmap::Add, LBitmapBase::Combine, LBitmap::AddShadow, LBitmap::AllocFTArray, LBitmap::ChangeHueSatInt, LBitmap::ColorReplace, LBitmap::ColorThreshold, LBitmap::DFT, LBitmap::DirectionEdgeStatistical, LBitmap::FFT, LBitmap::FreeFTArray, LBitmap::FrqFilter, LBitmap::FrqFilterMask, LBitmap::FTDisplay, LBitmap::GetStatisticsInfo, LBitmap::GetFeretsDiameter, LBitmap::GetObjectInfo, LBitmap::GetRgnContourPoints, LBitmap::GetRgnPerimeterLength, LBitmap::RevEffect, LBitmap::Segment, LBitmap::SubtractBackground, LBitmap::UserFilter, LBitmap::DirectionEdgeStatistical2

Topics:

Raster Image Functions: Modifying Intensity Values

 

Changing Brightness and Contrast

 

Raster Image Functions: Changing Brightness and Contrast

Example

L_INT LBitmap__MathFunctionExample(LBitmap *pLeadBitmap) 
{
   /* This example applies a Log Function over the loaded image. */
   /* Apply Log Function to this bitmap */
    return pLeadBitmap->MathFunction(MF_LOG, 100); 
}