#include stdio.h
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#ifdef WIN32
#include conio.h
#endif
#define SAMPLE double /* define the type used for data samples */
void clear(int ntaps, SAMPLE z[])
{
int ii;
for (ii = 0; ii ntaps; ii++) {
z[ii] = 0;
}
}
SAMPLE fir_basic(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[])
{
int ii;
SAMPLE accum;
/* store input at the beginning of the delay line */
z[0] = input;
/* calc FIR */
accum = 0;
for (ii = 0; ii ntaps; ii++) {
accum += h[ii] * z[ii];
}
/* shift delay line */
for (ii = ntaps - 2; ii = 0; ii--) {
z[ii + 1] = z[ii];
}
return accum;
}
SAMPLE fir_circular(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[],
int *p_state)
{
int ii, state;
SAMPLE accum;
state = *p_state; /* copy the filter's state to a local */
/* store input at the beginning of the delay line */
z[state] = input;
if (++state = ntaps) { /* incr state and check for wrap */
state = 0;
}
/* calc FIR and shift data */
accum = 0;
for (ii = ntaps - 1; ii = 0; ii--) {
accum += h[ii] * z[state];
if (++state = ntaps) { /* incr state and check for wrap */
state = 0;
}
}
*p_state = state; /* return new state to caller */
return accum;
}
SAMPLE fir_shuffle(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[])
{
int ii;
SAMPLE accum;
/* store input at the beginning of the delay line */
z[0] = input;
/* calc FIR and shift data */
accum = h[ntaps - 1] * z[ntaps - 1];
for (ii = ntaps - 2; ii = 0; ii--) {
accum += h[ii] * z[ii];
z[ii + 1] = z[ii];
}
return accum;
}
SAMPLE fir_split(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[],
int *p_state)
{
int ii, end_ntaps, state = *p_state;
SAMPLE accum;
SAMPLE const *p_h;
SAMPLE *p_z;
/* setup the filter */
accum = 0;
p_h = h;
/* calculate the end part */
p_z = z + state;
*p_z = input;
end_ntaps = ntaps - state;
for (ii = 0; ii end_ntaps; ii++) {
accum += *p_h++ * *p_z++;
}
/* calculate the beginning part */
p_z = z;
for (ii = 0; ii state; ii++) {
accum += *p_h++ * *p_z++;
}
/* decrement the state, wrapping if below zero */
if (--state 0) {
state += ntaps;
}
*p_state = state; /* return new state to caller */
return accum;
}
SAMPLE fir_double_z(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[],
int *p_state)
{
SAMPLE accum;
int ii, state = *p_state;
SAMPLE const *p_h, *p_z;
/* store input at the beginning of the delay line as well as ntaps more */
z[state] = z[state + ntaps] = input;
/* calculate the filter */
p_h = h;
p_z = z + state;
accum = 0;
for (ii = 0; ii ntaps; ii++) {
accum += *p_h++ * *p_z++;
}
/* decrement state, wrapping if below zero */
if (--state 0) {
state += ntaps;
}
*p_state = state; /* return new state to caller */
return accum;
}
SAMPLE fir_double_h(SAMPLE input, int ntaps, const SAMPLE h[], SAMPLE z[],
int *p_state)
{
SAMPLE accum;
int ii, state = *p_state;
SAMPLE const *p_h, *p_z;
/* store input at the beginning of the delay line */
z[state] = input;
/* calculate the filter */
p_h = h + ntaps - state;
p_z = z;
accum = 0;
for (ii = 0; ii ntaps; ii++) {
accum += *p_h++ * *p_z++;
}
/* decrement state, wrapping if below zero */
if (--state 0) {
state += ntaps;
}
*p_state = state; /* return new state to caller */
return accum;
}
int main(void)
{
#define NTAPS 6
static const SAMPLE h[NTAPS] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
static SAMPLE h2[2 * NTAPS];
static SAMPLE z[2 * NTAPS];
#define IMP_SIZE (3 * NTAPS)
static SAMPLE imp[IMP_SIZE];
SAMPLE output;
int ii, state;
/* make impulse input signal */
clear(IMP_SIZE, imp);
imp[5] = 1.0;
/* create a SAMPLEd h */
for (ii = 0; ii NTAPS; ii++) {
h2[ii] = h2[ii + NTAPS] = h[ii];
}
/* test FIR algorithms */
printf("Testing fir_basic:\n ");
clear(NTAPS, z);
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_basic(imp[ii], NTAPS, h, z);
printf("%3.1lf ", (double) output);
}
printf("\n\n");
printf("Testing fir_shuffle:\n ");
clear(NTAPS, z);
state = 0;
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_shuffle(imp[ii], NTAPS, h, z);
printf("%3.1lf ", (double) output);
}
printf("\n\n");
printf("Testing fir_circular:\n ");
clear(NTAPS, z);
state = 0;
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_circular(imp[ii], NTAPS, h, z, state);
printf("%3.1lf ", (double) output);
}
printf("\n\n");
printf("Testing fir_split:\n ");
clear(NTAPS, z);
state = 0;
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_split(imp[ii], NTAPS, h, z, state);
printf("%3.1lf ", (double) output);
}
printf("\n\n");
printf("Testing fir_double_z:\n ");
clear(2 * NTAPS, z);
state = 0;
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_double_z(imp[ii], NTAPS, h, z, state);
printf("%3.1lf ", (double) output);
}
printf("\n\n");
printf("Testing fir_double_h:\n ");
clear(NTAPS, z);
state = 0;
for (ii = 0; ii IMP_SIZE; ii++) {
output = fir_double_h(imp[ii], NTAPS, h2, z, state);
printf("%3.1lf ", (double) output);
}
#ifdef WIN32
printf("\n\nHit any key to continue.");
getch();
#endif
return 0;
}
1. fir_basic: 实现基本的FIR滤波器
2. fir_circular: 说明环行buffer是如何实现FIR的。
3. fir_shuffle: 一些TI的处理器上使用的shuffle down技巧
4. fir_split: 把FIR滤波器展开为两块，避免使用环行缓存。
5. fir_double_z: 使用双精度的延迟线，使可以使用一个flat buffer。
6. fir_double_h: 使用双精度的系数，使可以使用一个flat buffer。
1. 是规定做中值滤波的点不含边缘的点(取决于中值滤波窗口大小)。 2,对图像边缘部分的信息进行镜像处理。
可以告诉你方法：算数平均滤波，就是求出k次采样值的总和，再除以k；中值滤波法，是把k个采样值按照从小到大排列顺序，然后找到位于最中间的那个值；最后一种不知道你们老师的防脉冲是什么意思，猜测可能是去掉k次采样值中大于或小于某个值，剩余值求平均数。
让别人免费给你写程序基本上不可能，这个得花时间和精力。
按照题目要求写如下代码，后面附结果，如果满意，望采纳！
#include stdio.h
#include stdlib.h
#include string.h
double A[3][16] = {160,163,167,80,83,85,155,158,159,20,22,23,170,173,176,179,
159,158,155,75,78,80,156,159,153,25,23,21,167,168,166,164,
153,155,157,81,84,82,154,153,158,27,25,24,168,172,171,170};
double mask[3][3] = {1,2,1,
2,4,2,
1,2,1};
void myfilter(double* p)
{
int i,j;
for (i = 1; i = 14; ++i)
{
/* code */
double sum = 0;
for(j=0;j3;++j)
{
sum += A[j][i-1]*mask[j][0] + A[j][i]*mask[j][1] + A[j][i+1]*mask[j][2];
}
// printf("sum=%lf\n", sum);
*p++ = sum/16;
}
return;
}
int main(int argc, char const *argv[])
{
/* code */
double ans[14];
double * p = ans;
myfilter(p);
int i;
for(i=0;i14;++i)
{
printf("%.4lf\n", ans[i]);
}
printf("\n");
system("pause");
return 0;
}
int maopao(unsigned char n1,unsigned char n2,unsigned char n3,unsigned char n4,unsigned char n5,
unsigned char n6,unsigned char n7,unsigned char n8,unsigned char n9)
{
int ii,jj,t;
int a[9]={n1,n2,n3,n4,n5,n6,n7,n8,n9};
for(ii=0;ii8;ii++)
{
for (jj=0;jj8-ii;jj++)
{
if (a[jj]a[jj+1])
{
t=a[jj];
a[jj]=a[jj+1];
a[jj+1]=t;
}
}
}
return a[4];
}
0,1,2,3,4,5} ;.0,1,2,3,4,5} ; c } ？Char a = “ string” ; ？？？？Int a [] = “ string” ; 首先，a 是正确的，尽管数组的长度没有值，但它会自动确认数组的长度。C 的问题在于字符串的第一个地址被赋给了一个 char 变量。
