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C语言实现直方图统计
#include <stdio.h>
void DrawHistogram(int nArray[], int nCount, char ch) {
for (int i = 0; i < nCount; i++) {
for (int j = 0; j < nArray[i]; j++)
printf("%c", ch);
printf(" %d\n", nArray[i]);
}
printf("\n");
}
void CountRangeItems(int dArray[], int nDataItems, int nArray[]) {
for (int i = 0; i < nDataItems; i++) {
if (dArray[i] <= 160) nArray[0]++;
else if (dArray[i] < 165) nArray[1]++;
else if (dArray[i] < 170) nArray[2]++;
else if (dArray[i] < 175) nArray[3]++;
else if (dArray[i] > 175) nArray[4]++;
}
}
int main() {
int height[] = { 185, 176, 165, 169, 160, 152, 173, 196, 178, 169, 166, 182, 181, 171, 159, 163, 168 };
int nArray[5] = { 0 };
int nCount = 5, size = sizeof(height) / sizeof(height[0]);
CountRangeItems(height, size, nArray);
DrawHistogram(nArray, nCount, '*');
getchar();
return 0;
}
C语言实现直方图均衡化
#include <stdio.h>
void DrawHistogram(int nArray[], int nCount, char ch) {
for (int i = 0; i < nCount; i++) {
for (int j = 0; j < nArray[i]; j++)
printf("%c", ch);
printf(" %d\n", nArray[i]);
}
printf("\n");
}
void CountRangeItems(int dArray[], int nDataItems, int nArray[]) {
for (int i = 0; i < nDataItems; i++) {
if (dArray[i] <= 160) nArray[0]++;
else if (dArray[i] < 165) nArray[1]++;
else if (dArray[i] < 170) nArray[2]++;
else if (dArray[i] < 175) nArray[3]++;
else if (dArray[i] > 175) nArray[4]++;
}
}
int main() {
int height[] = { 158, 176, 165, 159, 160, 182, 173, 159, 178, 169, 166, 182, 179, 171, 159, 166, 157, 176, 171, 159 };
int nArray[5] = { 0 };
int nCount = 5, size = sizeof(height) / sizeof(height[0]);
CountRangeItems(height, size, nArray);
DrawHistogram(nArray, nCount, '*');
printf("\n");
//直方图归一化
float histPDF[] = { 0 };
printf("直方图归一化:\n");
for (int i = 0; i < nCount; i++)
{
histPDF[i] = float(nArray[i])/20.0;
//printf(" (%d) ", nArray[i]);
printf("%.2f ", histPDF[i]);
}
//累积直方图
printf("\n累积直方图:\n");
float histCDF[] = { 0 };
for (int i = 0; i < nCount; i++)
{
if (0 == i)
histCDF[i] = histPDF[i];
else
histCDF[i] = histCDF[i - 1] + histPDF[i];
printf("%.2f ",histCDF[i]);
}
//直方图均衡化,映射
printf("\n直方图均衡化:\n");
int histEQU[] = {0};
for (int i = 0; i < nCount; i++)
{
histEQU[i] = (int)(5.0 * histCDF[i] + 0.5);
printf("%d ",histEQU[i]);
}
getchar();
return 0;
}