我将 Quad 实现为 BST，但我尝试以这种方式拆分它，但效果不佳

Question

如果wsplit = 1我想根据宽度分割，否则根据高度分割。

threshold 将定义是否拆分。

tx, ty 将是四边形的左上角坐标。 sx = 原始图像的宽度

它将像

一样工作

(tx:ty = 0:0     w = 512,   h = 512,  wsplit = 1) ---> A

拆分后

(tx:ty =  0 :0     w = 256,   h = 512,  wsplit = 0) ---> B
(tx:ty = 256:0     w = 256,   h = 512,  wsplit = 0) ---> C

将在 BST（四叉树）

我也是

Quad *split(Image *im, Quad *root, int threshold) {
  if (root == NULL)
    return NULL;
  if (similar(im, root, threshold) == 0){ //this will define should split or not
    int tx = root->tx;;
    int ty = root->ty;
    int w = root->w;
    int h = root->h;
    int wsplit = root->wsplit;
    int sx = root->sx;
    int tx2,ty2,w1,w2,h1,h2;
    if(wsplit==0){
      h1 = (int)floor(h/2);
      h2 = h-h1;
      ty2 = ty+h1;
      wsplit = 1;
    }
    else{
      w1 = (int)floor(w/2);
      w2 = w-w1;
      tx2 = tx+w1;
      wsplit = 0;
    }
    Quad *first = NULL;
    Quad *second = NULL;
    first = new_Quad(tx, ty, w1, h1, wsplit, sx);
    second = new_Quad(tx2, ty2, w2, h2, wsplit, sx);
    root = quad_delete(root, tx, ty);
    root = insert(root, first);
    root = insert(root, second);
  }
  split(im, root->left, threshold);
  split(im, root->right, threshold);
  return root;
}

想一分为二，不知道为什么不行

Answer 1

看来问题是您忘记了初始化所有变量。您应该确保初始化 if 和 else 部分中的所有变量：

if (wsplit == 0) {
    w1 = w;   // was missing
    w2 = w;   // was missing
    h1 = h / 2;
    h2 = h - h1;
    tx1 = tx; // was missing
    tx2 = tx; // was missing
    ty1 = ty; // was missing
    ty2 = ty + h1;
    wsplit = 1;
} else {
    // same issues here
    ...
}

请注意，您的编译器应该警告您可能未初始化的变量。如果您还没有这样做，请启用编译器警告。然后还要修复编译器产生的所有警告。

我将 Quad 实现为 BST，但我尝试以这种方式拆分它，但效果不佳

I implemented Quad as BST, but I try to split it this way, but it's not working well

c

binary-search-tree

quadtree