LBitmap::AllocFTArray

#include "ltwrappr.h"

virtual L_INT LBitmap::AllocFTArray (ppFTArray, uStructSize, uFlags = 0)

pFTARRAY *ppFTArray;	pointer to pointer to FTARRAY structure
L_UINT uStructSize;	the size of the FTARRAY structure
L_UINT32 uFlags;	flags

Allocates a FTARRAY structure large enough to hold Fourier Transform coefficients for pBitmap. The structures uWidth and uHeight values are the same as the bitmaps width and height.

Parameter	Description
ppFTArray	Pointer to a pointer to a FTARRAY structure. The function will allocate a FTARRAY structure large enough to contain the Fourier transform coefficients for the bitmap. The address of this structure will be stored into *ppFTData. When the array is no longer needed, the user should free this structure by calling the LBitmap::FreeFTArray function.
uStructSize	The size of the structure. Should be sizeof(FTARRAY).
uFlags	Flags that indicate whether or not to pad the input image with zeros to be able to perform FFT for images without dimensions that are a power of two. The following flags represent how to pad the image:
	Value	Meaning
	FFT_PAD_NEVER	[0x00000000] Don't pad the image.
	FFT_PAD_OPTIMAL	[0x00010000] Pad the height and width with zeros to make them both a power of two.
	FFT_PAD_SQUARE	[0x00020000] Pad the height and width with zeros to make them both the same power of two.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

The amount allocated depends on the width and height of the image indicated in the bitmap handle.

This function is used only when you are dealing with Fourier Transform functions.

When you are finished, you should free the allocated array by calling the LBitmap::FreeFTArray function.

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

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

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

LTIMGCOR

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::Fragment, LBitmap::HighPassFilter, LBitmap::UnsharpMask, LBitmap::AverageFilter, LBitmap::MedianFilter, LBitmap::AddNoise, LBitmap::IntensityDetect, LBitmap::SpatialFilter, LBitmap::BinaryFilter, LBitmap::MaxFilter, LBitmap::MinFilter, LBitmap::AddShadow, 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::MathFunction, LBitmap::RevEffect, LBitmap::Segment, LBitmap::SubtractBackground, LBitmap::UserFilter, LBitmap::DirectionEdgeStatistical2
Topics:	Raster Image Functions: Fourier Transform Functions
	Removing Noise
	Raster Image Functions: Removing Noise

Example

For an example, refer to LBitmap::DFT.

Help Version 19.0.2017.10.27

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