C++图像处理数据块成数组/指针

Question

我在 txt 文件中有两个灰度图像，一个是主图像的较小块。我已将图像读入两个不同的二维向量矩阵。

图像的行和列是：

主要：M = 768 N = 1024

SubImg：R = 49 C = 36

int R = 49;诠释 C = 36; //子图像行/列

int M = 768;整数 N = 1024; //主图像行/列

我已经按宽度：49 和高度：36 的块循环遍历主图像，我想将每个块放入一个数组中，所以我可以将数组与子图像（使用最近邻搜索）进行比较，看看哪个块具有最接近子图像的结果。

这是主图的循环代码：

for (double bx = 0; bx < M; bx += R)
    for (double by = 0; by < N; by += C)
    {
        for (int x = 0; ((x < R) && ((bx + x) < M)); ++x)
        {
            for (int y = 0; ((y < C) && ((by + y) < N)); ++y)
            {
                if ((bx + x) >= M) 
                {
                    std::cout << (bx + x) << (by + y) << " ";

                }
                cout << MainIMG_2DVector[bx + x][by + y] << " ";
            }
        }
        cout << "\n\n\n" << endl;
    }

此循环一次性显示所有块。我遇到的问题是我不知道如何将每个块放入一个数组中，所以我可以比较数据。 另外，使用指针而不是数组更好吗？

谢谢

Answer 1

我不确定你想如何比较块，但就存储块而言，你可以像这样制作一个简单的 Block 对象：

const double R = 49, C = 36;

// Block object (takes in your image 2D vector and x/y coordinates)
class Block {
public:
    Block(std::vector<std::vector<int>> *img_vector, int bx, int by);
    int compare(const Block &block) const;

private:
    std::vector<std::vector<int>> *img_vector;
    int bx, by;
};

Block::Block(std::vector<std::vector<int>> *img_vector, int bx, int by) {
    this->img_vector = img_vector;
    this->bx = bx;
    this->by = by;
}

// Compare any two blocks
int Block::compare(const Block &block) const {
    for (int x = bx; x < bx + R; x++) {
        for (int y = by; y < by + C; y++) {
            // Do some comparing
            std::cout << "Compare " << (*img_vector)[x][y]
                << " with " << (*block.img_vector)[x][y] << std::endl;
        }
    }
    return 0; // Return some value that indicates how they compare
}

然后将图像块添加到向量中：

// Add main image blocks to vector
std::vector<Block> main_img_blocks;
for (double bx = 0; bx < M; bx += R) {
    for (double by = 0; by < N; by += C)
        main_img_blocks.push_back(Block(&MainIMG_2DVector, bx, by));
}

// Do the same for sub image blocks...

// Invoke the compare function between 2 blocks at a time
int comp_value = main_img_blocks[0].compare(main_img_blocks[1]);

希望有帮助:)