OpenCV的：访问并采取平方根像素 [英] OpenCV: Accessing And Taking The Square Root Of Pixels

问题描述

我使用了OpenCV的物体检测，我想能够执行的操作之一是每个像素的平方根。我想象中的循环会是这样的：

I'm using OpenCV for object detection and one of the operations I would like to be able to perform is a per-pixel square root. I imagine the loop would be something like:

IplImage* img_;
...
for (int y = 0; y < img_->height; y++) {
  for(int x = 0; x < img_->width; x++) {
    // Take pixel square root here
  }
}

我的问题是我怎么能在IplImage结构访问对象在坐标（x，y）的像素值？

My question is how can I access the pixel value at coordinates (x, y) in an IplImage object?

推荐答案

假设IMG_是类型的IplImage的，并假设16位无符号整型数据，我想说

Assuming img_ is of type IplImage, and assuming 16 bit unsigned integer data, I would say

unsigned short pixel_value = ((unsigned short *)&(img_->imageData[img_->widthStep * y]))[x];

又见这里的IplImage定义。

See also here for IplImage definition.

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