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OpenCV IO Mat #473

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junxnone opened this issue Aug 27, 2024 · 0 comments
Open

OpenCV IO Mat #473

junxnone opened this issue Aug 27, 2024 · 0 comments

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@junxnone
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OpenCV Mat

elemSize

  • 元素大小
  • 元素指 CV_8UC1/CV_8UC3/CV_32FC1/...
  • elemSize1 : elemSize 一个通道 size
TYPE elemSize elemSize1
CV_8UC1 1 1
CV_8UC3 3 1
CV_16UC1 2 2
CV_16UC3 6 2
CV_32FC1 4 4
CV_32FC4 16 4
... ... ...

step(stride)

  • 存储着各个维度占用的内存块的大小
  • step[0] = cols * elemSize
  • step[1] = elemSize
  • step1: 以 elemSize1 为单位

.at

  • 访问元素
  • img.at(y, x)

.ptr

  • 访问矩阵某行, 返回指向矩阵某行开始的地址
  • img->ptr(n)

Reference
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