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資源簡介

mnist手寫字符集（0-9），已經將idx3-ubyte格式數據提取為jpg圖片，方便學習研究深度學習和字符識別使用

資源截圖

代碼片段和文件信息 

//下面的代碼將mnist官網上的數據轉化為圖片
//依賴C++11和opencv
#include
#include
#include
#include
#include

using?namespace?std;

inline?int?to_int?（const?void*data）
{
????unsigned?char*?ptr?=?（unsigned?char*）?data;
????int?result?=?0;
????
????for?（int?i?=?3;?i?>=?0;?i--）
????{
????????result?+=??ptr[i]?*?pow?（256?3?-?i）;
????}
????
????return?result;
}

int?main（）
{
????const?string?mnist_data_path?（R“（F:\libs\caffe\data\mnist\t10k-images-idx3-ubyte）“）;
????const?string?mnist_label_path?（R“（F:\libs\caffe\data\mnist\t10k-labels-idx1-ubyte）“）;
????const?string?dst_img_dir?（R“（F:\libs\caffe\data\mnist\test_10000）“）;
????FILE?*?f_data_handle?=?fopen?（mnist_data_path.c_str（）?“rb“）;
????FILE?*?f_label_handle?=?fopen?（mnist_label_path.c_str（）?“rb“）;
????fseek?（f_label_handle?8?SEEK_SET）;
????char?buff[4];
????fread?（?（void*）?&buff?4?1?f_data_handle）;
????int?magic_num?=?to_int?（buff）;
????fread?（?（void*）?&buff?4?1?f_data_handle）;
????int?num_imgs?=?to_int?（buff）;
????fread?（?（void*）?&buff?4?1?f_data_handle）;
????int?num_rows?=?to_int?（buff）;
????fread?（?（void*）?&buff?4?1?f_data_handle）;
????int?num_cols?=?to_int?（buff）;
????cv::Mat?img_buf?（num_rows?num_cols?CV_8U?cv::Scalar?（0））;
????assert?（img_buf.isContinuous（））;
????unsigned?char*?pixel_ptr?=?img_buf.ptr?（0）;
????int?count_all?=?-1;
????map?count_one;
????
????for?（int?i?=?0;?i?????{
????????if?（i?%?1000?==?0）?{?cout?<????????
????????unsigned?char?label?=?fgetc?（f_label_handle）;
????????count_all++;
????????count_one[label]++;
????????
????????for?（int?j?=?0;?j?????????{
????????????pixel_ptr[j]?=?fgetc?（f_data_handle）;
????????}
????????
????????cv::imwrite?（dst_img_dir?+?“\\“?+?（to_string?（label）?+?“_“?+?to_string?（count_one[label]）?+?“_“?+?to_string?（count_all）?+?“.jpg“）?img_buf）;
????????//cv::imshow?（“HH“?img_buf）;
????????//cv::waitKey?（1）;
????}
}

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