c语言编写用opencv将路径/root/photo/compressphoto中的.jpg图片解压缩到路径/root/photo/decompressphoto中，给出相应程序和对应的Makefile文件，注意opencv文件处于/root/opencv-4.5.1文件夹中。

以下是相应的程序和Makefile文件：

程序：

#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;

int main(int argc, char** argv )
{
    if ( argc != 3 )
    {
        printf("usage: %s <compress_folder> <decompress_folder>\n", argv[0]);
        return -1;
    }

    char* compress_folder = argv[1];
    char* decompress_folder = argv[2];

    // Open the compress folder
    DIR* dir = opendir(compress_folder);
    if (dir == NULL) {
        printf("Cannot open directory %s\n", compress_folder);
        return -1;
    }

    // Loop through all the files in the compress folder
    struct dirent* entry;
    while ((entry = readdir(dir)) != NULL) {
        if (entry->d_type == DT_REG) {
            const char* filename = entry->d_name;
            char compress_path[200];
            sprintf(compress_path, "%s/%s", compress_folder, filename);

            // Read the compressed image
            Mat img = imread(compress_path, IMREAD_UNCHANGED);
            if (img.empty()) {
                printf("Cannot read image %s\n", compress_path);
                continue;
            }

            // Decompress the image
            Mat decompressed_img;
            cv::decompress(img, decompressed_img);

            // Save the decompressed image
            char decompress_path[200];
            sprintf(decompress_path, "%s/%s", decompress_folder, filename);
            imwrite(decompress_path, decompressed_img);
        }
    }

    closedir(dir);

    return 0;
}

Makefile文件：

CC = g++
CFLAGS = -Wall -I/root/opencv-4.5.1/include
LDFLAGS = -L/root/opencv-4.5.1/lib `pkg-config --libs opencv`

all: decompress_photo

decompress_photo: decompress_photo.o
    $(CC) -o $@ $^ $(LDFLAGS)

decompress_photo.o: decompress_photo.cpp
    $(CC) $(CFLAGS) -c -o $@ $<

clean:
    rm -f *.o decompress_photo

注意：在Makefile文件中，需要修改相应的opencv库路径和头文件路径。