[英]Access violation while trying to compute FFT (fast Fourier transform) of 2 images
I am trying to take FFT of two raw images. 我正在尝试对两个原始图像进行FFT。 But I am getting
unhandled exception (access violation)
- I could not figure out why. 但是我遇到了
unhandled exception (access violation)
-我不知道为什么。 I am using fftw library. 我正在使用fftw库。 First I am reading two images, then I calculate FFT.
首先,我读取两个图像,然后计算FFT。 But before it starts calculating, it produces access violation error.
但是在开始计算之前,它会产生访问冲突错误。
#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include "fftw3.h"
#define Width 2280
#define Height 170
unsigned char im2[170*2280];
unsigned char im1[170*2280];
float image1[170*2280];
float image2[170*2280];
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
FILE* fp1, *fp2;
//Read two images
fp1 = fopen ("image1.raw" , "r");
fread(im1, sizeof(unsigned char), Width* Height, fp1);
fp2 = fopen ("image2.raw" , "r");
fread(im2, sizeof(unsigned char), Width* Height, fp2);
fclose(fp2);
fclose(fp1);
//Typecasting two images into float
for (int i = 0; i < Width* Height; i++)
{
image1[i]= (float)im1[i];
image2[i] = (float)im2[i];
}
fftwf_plan fplan1, fplan2;
fftwf_complex fft1[((Width/2)+1)*2];
fftwf_complex fft2[((Width/2)+1)*2];
fplan1 = fftwf_plan_dft_r2c_2d(Height, Width, (float*)image1, fft1, FFTW_ESTIMATE);
fftwf_execute(fplan1);
fftwf_destroy_plan(fplan1);
fplan2 = fftwf_plan_dft_r2c_2d(Height,Width, image2, (fftwf_complex*)fft2, FFTW_ESTIMATE);
fftwf_execute(fplan2);
fftwf_destroy_plan(fplan2);
_getch();
return 0;
}
fft1
and fft2
are only large enough to hold one output row - you need Height
rows. fft1
和fft2
仅足够容纳一个输出行-您需要Height
行。 You'll probably want to allocate them dynamically too, as they will most likely be too large for the stack once you have the correct size, eg 您可能还希望动态分配它们,因为一旦您具有正确的大小,它们对于堆栈来说就太大了,例如
fftwf_complex *fft1 = new fftwf_complex[((Width/2)+1)*2*Height];
fftwf_complex *fft2 = new fftwf_complex[((Width/2)+1)*2*Height];
NB: don't forget to call delete []
to free these later. 注意:不要忘记调用
delete []
以便稍后释放它们。
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