c++ - Weird Values in an IplImage

Question

I do have an IplImage I. and it's supposed to have values from 0 to 255 (pixels). I'm having in it unfortunately weird special characters like:

ØÕÖÕÓÎËÍÌÈÃÃÁ»¶±«¨¤Ÿ™”‰

I did the following: uchar* d_I = (uchar*) I->imageData;

How can I convert those characters into values from 0 to 255 ?

score 0 · Accepted Answer

你在考虑 image->widthStep 吗？像素不仅仅是指向您传递给 cvCreateImage 的数据类型（或由 cvLoadImage 加载的数据类型）然后递增的指针...行对齐到 4 或 8 个字节，因此每一行不一定在内存中接触（尽管它会在几个字节内接近）。

访问您的像素：
(unsigned char)CV_IMAGE_ELEM(myImage, unsigned char, y, x)

或者如果您从 64F 深度图像开始：
(double)CV_IMAGE_ELEM(myImage, double, row, col)

score 0 · Accepted Answer

既然您已经标记了 c++，那么您可以使用 cout 将 char 打印为数字。保留您以前的代码。

uchar* d_I = (uchar*) I->imageData;
std::cout <<(int) *d_I;

score -1 · Accepted Answer

-1

您应该转换为 int，而不是转换为 uchar：

int* d_l = (int*)l->imageData

于 2013-03-20T09:52:23.807 回答

3 回答 3