C++ 如何在容器中加载 16 位 TIFF 文件以对其数据执行数学运算？

Question

我编写了一个小型 C++ 控制台应用程序，其中包含可加载的 code::blocksCSV 文件中的一组值，对值执行特殊的“反向”随机抖动，并将结果导出为 PBM 文件(位图)。

最终 PBM 图片上黑色像素的密度取决于 3 个自变量:“白色反射率”、“黑色反射率”和 CSV 值。

我使用 CSV 文件的原因是因为我不知道如何将 TIFF 文件直接加载到我的脚本中。我的文件“wall.csv”的值是由一个将任何 tiff 文件转换为 csv 格式的 python 脚本...

能否请您检查我的代码并建议一个加载 TIFF 并自动检测图像大小(以像素为单位)的解决方案？变量 colo和 lines定义包含在 CSV 中作为 ASCII 数据的图像的大小...图像值加载到 vector <float> CSV 中

你会使用什么库来加载 tiff？

谢谢!

代码:

#include <deque>
#include <cmath>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <random>
#include <cstdlib>
using namespace std;

deque <float> CSV;          // CSV input values, "PHOTOMETRY"
deque <float> RND;          // will contain random values from 0.0 to 1.0

int   colo   = 0;           // variables inputed
int   lines  = 0;           // lines
float YBK    = 0;           // Reflectance White
float YW     = 0;           // Reflectance Black

float Lmax   = 0;           // variables to be computed
float Lmin   = 10000000;    // arbitrarily high value
float NBK    = 0;           // will contain a normalized Black value
float NW     = 1;           // normalized white value
float CRATIO = 0;           // Black to White dynamic ratio
float LRATIO = 0;           // Lowest to Highest pixel value dynamic ratio

float Z      = 0;           // processing variables
float X      = 0;
float aBK    = 0;           // computed density of black at each pixel
float vRND   = 0;           // random value container
float IO     = 0;

int main(){

cout << "please put a file named wall.csv" << endl << "in the same forler as this executable" << endl << endl;
cout << "how many:" << endl << "columns does the CSV has?" << endl;
cin  >> colo;
cout << "lines   does the CSV has?" << endl;
cin  >> lines;
cout << "reflectance of the WHITE (CIE Y)?" << endl;
cin  >> YW;
cout << "reflectance of the BLACK (CIE Y)?" << endl;
cin  >> YBK;

NBK    = YBK / YW;      // normalized BK
CRATIO = NW / NBK;      // correction Ratio
int C  = lines * colo;  // cells

cout << endl << "   there are: "               << colo   << "  columns";
cout << endl << "   and      : "               << lines  << "  lines " ;
cout << endl << "   that makes "               << C      << " cells " << endl;
cout << endl << "   correction ratio is: " << CRATIO << endl << endl;

///_____ IMPORT THE PHOTOMETRIC DATA

cout << "...importing the photometric data" << endl;

float x = 0;     // a variable that will contain a value from the file

    ifstream ifs ("wall.csv");

    char dummy;
    for (int i = 0; i < lines; ++i){
        for (int i = 0; i < colo; ++i){
            ifs >> x;

            if (x > Lmax) {
                Lmax = x;     // determines the highest pixel value
            }
            if (x < Lmin) {
                Lmin = x;     // determines the lowest  pixel value
            }

            CSV.push_back(x);

            // So the dummy won't eat digits
            if (i < (colo - 1))
                ifs >> dummy;
    }}

    ifstream ifs_close();
    LRATIO = Lmax / Lmin;

cout << "...photometric data imported"    << endl;
cout << endl << "   maximum Luminance  is: " << Lmax;
cout << endl << "   minimum Luminance  is: " << Lmin << endl;
cout << endl << "...luminance ratio is: " << LRATIO;

if (LRATIO > CRATIO) {
    cout << endl << "...luminance ratio is: " << LRATIO;
    cout << endl << "...this is too high, ending..." << '\a';
    return(0);
}

cout << endl << "...luminance can be corrected :)" << endl;

///______ CREATE RANDOM VALUES BETWEEN 0 & 1

  std::default_random_engine generator;
  std::uniform_real_distribution <double> distribution(0.0,1.0);

  for (int i=0; i<C; ++i) {
    double number = distribution(generator);
    RND.push_back(number);
  }

cout << endl << "...random values created" << endl;


///_______ process & export to PBM

ofstream output_file("./wall.pbm");

output_file << "P1" << "\n" << colo << " " << lines << "\n"; /// PBM HEADER

cout << endl << "...file header written" << endl;
cout << endl << "...computing";

int CELLS   = C;  // copy the amount of cells
int LINEW   = colo;
int PERCENT = 100;

    while (CELLS > 0) {
        while (LINEW > 0) {

            Z    = Lmin/CSV.front();        /// processing calculus
            X    = (NBK - Z)/(NBK - NW);
            aBK  = (1 - X);
            vRND = RND.front();


                            if (aBK > (vRND)) {
                                IO = 1;
                            }
                            else {
                                IO = 0;
                            }


            LINEW   = LINEW - 1;
            CELLS   = CELLS - 1;
            PERCENT = PERCENT - CELLS / C;

            output_file << IO << "\n";
            //cout << ERR << " "; /// fancy...

            CSV.erase(CSV.begin());
            RND.erase(RND.begin());
            }

        LINEW = colo;
    }


cout << endl << "...computing done" << endl;
cout << "...file written";

output_file.close();
return(0);
}

Answer 1

检查库 tiff。 OpenCV 也只使用 lib tiff。

http://www.libtiff.org/