用c++语言使用opencv将图片中指定的像素集合存到链表

以下是一个基本的示例代码，可以将图片中指定的像素集合存到链表中：

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

using namespace cv;

typedef struct node {
    int x;
    int y;
    struct node* next;
} Node;

Node* createNode(int x, int y) {
    Node* newNode = (Node*)malloc(sizeof(Node));
    newNode->x = x;
    newNode->y = y;
    newNode->next = NULL;
    return newNode;
}

void insertNode(Node** head, int x, int y) {
    Node* newNode = createNode(x, y);
    if (*head == NULL) {
        *head = newNode;
    }
    else {
        Node* current = *head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = newNode;
    }
}

int main(int argc, char** argv) {
    if (argc != 2) {
        printf("Usage: ./program_name image_file\n");
        return -1;
    }
    char* filename = argv[1];

    Mat image = imread(filename, IMREAD_GRAYSCALE);
    if (image.empty()) {
        printf("Error: could not read image file %s\n", filename);
        return -1;
    }

    int threshold = 128; // set threshold value for binary image
    Mat binaryImage;
    threshold(image, binaryImage, threshold, 255, THRESH_BINARY);

    Node* head = NULL;
    for (int i = 0; i < binaryImage.rows; i++) {
        for (int j = 0; j < binaryImage.cols; j++) {
            if (binaryImage.at<uint8_t>(i, j) == 255) {
                insertNode(&head, j, i); // note the order of x and y coordinates
            }
        }
    }

    // print the coordinates stored in the linked list
    printf("Coordinates of white pixels in the image:\n");
    Node* current = head;
    while (current != NULL) {
        printf("(%d, %d)\n", current->x, current->y);
        current = current->next;
    }

    // free the memory used by the linked list
    current = head;
    while (current != NULL) {
        Node* temp = current;
        current = current->next;
        free(temp);
    }

    return 0;
}

该程序首先读取指定的图像文件，将其转换为二值图像（使用指定的阈值）并存储在 `binaryImage` 中。然后，程序遍历 `binaryImage` 中的每个像素，并将其坐标存储在链表中，如果该像素的值为 255（即白色像素）。最后，程序打印链表中存储的坐标，并释放链表的内存。

请注意，该程序需要 OpenCV 库和 C++11 标准支持。如果您正在使用 Windows 平台，则应将 `gcc` 命令替换为 `g++` 命令，并将 `#include <opencv2/opencv.hpp>` 改为 `#include <opencv2/core.hpp>` 和 `#include <opencv2/imgproc.hpp>`，并在编译时链接 OpenCV 库。