关于位图方面的（这个就是从四铮图里，分别取其相对的平均值，完后组合成一副完整的位图数据，之后，把它处理，但是其中有些地方不懂，可以较详细的解释下吗？）有错误

[酬勤-人间道]

void CSCOMMDlg::Bilinear_interpolation()
{
if (m_vecImageData.size() <= 0)
{
return;
}
m_vecBilinearImageData.clear();
m_vecBilinearImageData.resize(m_vecImageData.size() * 4);

std::vector<int> vectemp0;
std::vector<int> vectemp1;
std::vector<int> vectemp2;

vectemp0.resize(m_vecImageData.size());
vectemp1.resize(m_vecImageData.size());
vectemp2.resize(m_vecImageData.size());

//step0
for (int i = 0;i < vectemp0.size();i++)
{
int a0,a1,a2,a3;
int sum;

if (i < IMAGE_HEIGHT) //第一排
{
if (i % (IMAGE_HEIGHT - 1) == 0 && i != 0)//最末端
{
sum = m_vecImageData[i];
}
else
{
a0 = m_vecImageData[i];
a1 = m_vecImageData[i + 1];

sum = (a0 + a1)/2;
}
}
else
{
int nCol = i / IMAGE_HEIGHT;

if (i % ((nCol + 1) * IMAGE_HEIGHT - 1) == 0)//最末端
{
a0 = m_vecImageData[i - IMAGE_HEIGHT];
a1 = m_vecImageData[i];

sum = (a0 + a1)/2;
}
else
{
a0 = m_vecImageData[i - IMAGE_HEIGHT];
a1 = m_vecImageData[i - IMAGE_HEIGHT + 1];
a2 = m_vecImageData[i];
a3 = m_vecImageData[i + 1];

sum = (a0 + a1 + a2 + a3)/4;
}
}
vectemp0[i] = sum;
}

//step1
for (int i = 0;i < vectemp1.size();i++)
{
int a0,a1,a2,a3;
int sum;

if (i < IMAGE_HEIGHT) //第一排
{
if (i == 0)//最前端
{
sum = (m_vecImageData[0] + vectemp0[0]) / 2;
}
else
{
a0 = vectemp0[i - 1];
a1 = vectemp0[i];
a2 = m_vecImageData[i];
sum = (a0 + a1 + a2)/3;
}
}
else
{
int nCol = i / IMAGE_HEIGHT;

if (i % IMAGE_HEIGHT == 0)//最前端
{
a0 = m_vecImageData[i - IMAGE_HEIGHT];
a1 = m_vecImageData[i];
a2 = vectemp0[i];

sum = (a0 + a1 + a2)/3;
}
else
{
a0 = m_vecImageData[i - IMAGE_HEIGHT];
a1 = m_vecImageData[i];
a2 = vectemp0[i - 1];
a3 = vectemp0[i];

sum = (a0 + a1 + a2 + a3)/4;
}
}
vectemp1[i] = sum;
}
//step2
for (int i = 0;i < vectemp2.size();i++)
{
int a0,a1,a2,a3;
int sum;

if (i >= (IMAGE_WIDTH - 1) * IMAGE_HEIGHT)//最后排
{
if (i == IMAGE_WIDTH * IMAGE_HEIGHT - 1)//最后排末端
{
sum = vectemp1[i];
}
else
{
a0 = vectemp1[i];
a1 = vectemp1[i + 1];

sum = (a0 + a1) / 2;
}
}
else
{
int nCol = i / IMAGE_HEIGHT;

if (i % ((nCol + 1) * IMAGE_HEIGHT - 1) == 0)//最末端
{
a0 = vectemp1[i];
a1 = vectemp1[i + IMAGE_HEIGHT];

sum = (a0 + a1)/2;
}
else
{
a0 = vectemp1[i];
a1 = vectemp1[i + 1];
a2 = vectemp1[i + IMAGE_HEIGHT];
a3 = vectemp1[i + IMAGE_HEIGHT + 1];
sum = (a0 + a1 + a2 + a3)/4;
}
}
vectemp2[i] = sum;
}

for (int i = 0 ;i < vectemp0.size();i++)
{
m_vecBilinearImageData[i * 4 + 0] = vectemp1[i];
m_vecBilinearImageData[i * 4 + 1] = vectemp0[i];
m_vecBilinearImageData[i * 4 + 2] = m_vecImageData[i];
m_vecBilinearImageData[i * 4 + 3] = vectemp2[i];
}
}

[酬勤-人间道]

感谢，学生受教了

[赵4老师]

Computer_Vision_Algorithms_and_Applications_SzeliskiBook_20100903_draft.pdf 代码功能归根结底不是别人帮自己看或讲解或注释出来的；而是被自己静下心来花足够长的时间和精力亲自动手单步或设断点或对执行到某步获得的中间结果显示或写到日志文件中一步一步分析出来的。 提醒：再牛×的老师也无法代替学生自己领悟和上厕所！ 单步调试和设断点调试（VS IDE中编译连接通过以后，按F10或F11键单步执行，按Shift+F11退出当前函数；在某行按F9设断点后按F5执行停在该断点处。）是程序员必须掌握的技能之一。 用一个足够小的图比如8x8像素大小的图辅助调试你这段代码，在代码的每一步，将每个像素的当前RGB或GRAY值输出到一个日志文件中。 写日志参考：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
    #pragma warning(disable:4996)
    #include <windows.h>
    #include <io.h>
#else
    #include <unistd.h>
    #include <sys/time.h>
    #include <pthread.h>
    #define  CRITICAL_SECTION   pthread_mutex_t
    #define  _vsnprintf         vsnprintf
#endif
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
static char logstr[MAXLINSIZE+1];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
#ifdef _MSC_VER
void Lock(CRITICAL_SECTION *l) {
    EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
    LeaveCriticalSection(l);
}
#else
void Lock(CRITICAL_SECTION *l) {
    pthread_mutex_lock(l);
}
void Unlock(CRITICAL_SECTION *l) {
    pthread_mutex_unlock(l);
}
#endif
void LogV(const char *pszFmt,va_list argp) {
    struct tm *now;
    struct timeb tb;

    if (NULL==pszFmt||0==pszFmt[0]) return;
    _vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
    ftime(&tb);
    now=localtime(&tb.time);
    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );
    sprintf(mss,"%03d",tb.millitm);
    printf("%s %s.%s %s",datestr,timestr,mss,logstr);
    flog=fopen(logfilename1,"a");
    if (NULL!=flog) {
        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
        if (ftell(flog)>MAXLOGSIZE) {
            fclose(flog);
            if (rename(logfilename1,logfilename2)) {
                remove(logfilename2);
                rename(logfilename1,logfilename2);
            }
        } else {
            fclose(flog);
        }
    }
}
void Log(const char *pszFmt,...) {
    va_list argp;

    Lock(&cs_log);
    va_start(argp,pszFmt);
    LogV(pszFmt,argp);
    va_end(argp);
    Unlock(&cs_log);
}
//Log}
int main(int argc,char * argv[]) {
    int i;
#ifdef _MSC_VER
    InitializeCriticalSection(&cs_log);
#else
    pthread_mutex_init(&cs_log,NULL);
#endif
    for (i=0;i<10000;i++) {
        Log("This is a Log %04d from FILE:%s LINE:%d\n",i, __FILE__, __LINE__);
    }
#ifdef _MSC_VER
    DeleteCriticalSection(&cs_log);
#else
    pthread_mutex_destroy(&cs_log);
#endif
    return 0;
}
//1-79行添加到你带main的.c或.cpp的那个文件的最前面
//81-86行添加到你的main函数开头
//90-94行添加到你的main函数结束前
//在要写LOG的地方仿照第88行的写法写LOG到文件MyLog1.log中