在编译opencv扩展模块的时候遇见一些问题，想请教各位

cmake在generate的时候出现的，vs2015+opencv3.4.0
CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/calib3d/.calib3d

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/calib3d

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/core/.core

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/core

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudaarithm/.cudaarithm

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudaarithm

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudabgsegm/.cudabgsegm

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudabgsegm

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudacodec/.cudacodec

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudacodec

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudafeatures2d/.cudafeatures2d

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudafeatures2d

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudafilters/.cudafilters

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudafilters

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudaimgproc/.cudaimgproc

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudaimgproc

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudalegacy/.cudalegacy

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudalegacy

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudaobjdetect/.cudaobjdetect

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudaobjdetect

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudaoptflow/.cudaoptflow

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudaoptflow

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudastereo/.cudastereo

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudastereo

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudawarping/.cudawarping

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudawarping

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/cudev/.cudev

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/cudev

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/dnn/.dnn

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/dnn

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/features2d/.features2d

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/features2d

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/flann/.flann

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/flann

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/highgui/.highgui

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/highgui

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/imgcodecs/.imgcodecs

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/imgcodecs

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/imgproc/.imgproc

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/imgproc

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/java/.java

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/java

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/js/.js

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/js

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/ml/.ml

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/ml

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/objdetect/.objdetect

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/objdetect

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/photo/.photo

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/photo

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/python/.python

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/python

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/shape/.shape

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/shape

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/stitching/.stitching

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/stitching

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/superres/.superres

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/superres

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/ts/.ts

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/ts

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/video/.video

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/video

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/videoio/.videoio

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/videoio

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/videostab/.videostab

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/videostab

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/viz/.viz

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/viz

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

CMake Error at cmake/OpenCVModule.cmake:291 (add_subdirectory):
The binary directory

D:/opencv3.4/opencv/newbuild/modules/world/.world

is already used to build a source directory. It cannot be used to build
source directory

D:/opencv-3.4.0/opencv-3.4.0/modules/world

Specify a unique binary directory name.
Call Stack (most recent call first):
modules/CMakeLists.txt:7 (ocv_glob_modules)

欢迎使用Markdown编辑器

你好！ 这是你第一次使用 Markdown编辑器 所展示的欢迎页。如果你想学习如何使用Markdown编辑器, 可以仔细阅读这篇文章，了解一下Markdown的基本语法知识。

新的改变

我们对Markdown编辑器进行了一些功能拓展与语法支持，除了标准的Markdown编辑器功能，我们增加了如下几点新功能，帮助你用它写博客：

1. 全新的界面设计 ，将会带来全新的写作体验；
2. 在创作中心设置你喜爱的代码高亮样式，Markdown 将代码片显示选择的高亮样式 进行展示；
3. 增加了 图片拖拽 功能，你可以将本地的图片直接拖拽到编辑区域直接展示；
4. 全新的 KaTeX数学公式 语法；
5. 增加了支持甘特图的mermaid语法¹ 功能；
6. 增加了 多屏幕编辑 Markdown文章功能；
7. 增加了 焦点写作模式、预览模式、简洁写作模式、左右区域同步滚轮设置 等功能，功能按钮位于编辑区域与预览区域中间；
8. 增加了 检查列表 功能。

功能快捷键

撤销：Ctrl/Command + Z
重做：Ctrl/Command + Y
加粗：Ctrl/Command + B
斜体：Ctrl/Command + I
标题：Ctrl/Command + Shift + H
无序列表：Ctrl/Command + Shift + U
有序列表：Ctrl/Command + Shift + O
检查列表：Ctrl/Command + Shift + C
插入代码：Ctrl/Command + Shift + K
插入链接：Ctrl/Command + Shift + L
插入图片：Ctrl/Command + Shift + G

合理的创建标题，有助于目录的生成

直接输入1次#，并按下space后，将生成1级标题。
输入2次#，并按下space后，将生成2级标题。
以此类推，我们支持6级标题。有助于使用TOC语法后生成一个完美的目录。

如何改变文本的样式

强调文本 强调文本

加粗文本 加粗文本

标记文本

删除文本

引用文本

H₂O is是液体。

2¹⁰ 运算结果是 1024.

插入链接与图片

链接: link.

图片:

带尺寸的图片:

居中的图片:

居中并且带尺寸的图片:

当然，我们为了让用户更加便捷，我们增加了图片拖拽功能。

如何插入一段漂亮的代码片

去博客设置页面，选择一款你喜欢的代码片高亮样式，下面展示同样高亮的 代码片.

// An highlighted block
var foo = 'bar';

生成一个适合你的列表

• 项目
  • 项目
    • 项目

1. 项目1
2. 项目2
3. 项目3

• 计划任务
• 完成任务

创建一个表格

一个简单的表格是这么创建的：

项目	Value
电脑	$1600
手机	$12
导管	$1

设定内容居中、居左、居右

使用:---------:居中
使用:----------居左
使用----------:居右

第一列	第二列	第三列
第一列文本居中	第二列文本居右	第三列文本居左

SmartyPants

SmartyPants将ASCII标点字符转换为“智能”印刷标点HTML实体。例如：

TYPE	ASCII	HTML
Single backticks	'Isn't this fun?'	‘Isn’t this fun?’
Quotes	"Isn't this fun?"	“Isn’t this fun?”
Dashes	-- is en-dash, --- is em-dash	– is en-dash, — is em-dash

创建一个自定义列表

Markdown

Text-to- HTML conversion tool

Authors

John

Luke

如何创建一个注脚

一个具有注脚的文本。²

注释也是必不可少的

Markdown将文本转换为 HTML。

KaTeX数学公式

您可以使用渲染LaTeX数学表达式 KaTeX:

Gamma公式展示 $\Gamma (n)=(n-1)!\forall n\in \mathbb{N}$ 是通过欧拉积分

$$\Gamma (z)={\int }_0^{\infty }{t}^{z-1}{e}^{-t}dt.$$

你可以找到更多关于的信息 LaTeX 数学表达式here.

新的甘特图功能，丰富你的文章

Mon 06 Mon 13 Mon 20 已完成 进行中 计划一 计划二 现有任务 Adding GANTT diagram functionality to mermaid

• 关于 甘特图 语法，参考 这儿,

UML 图表

可以使用UML图表进行渲染。 Mermaid. 例如下面产生的一个序列图：:

张三 李四 王五 你好！李四, 最近怎么样? 你最近怎么样，王五？ 我很好，谢谢! 我很好，谢谢! 李四想了很长时间, 文字太长了 不适合放在一行. 打量着王五... 很好... 王五, 你怎么样? 张三 李四 王五

这将产生一个流程图。:

链接

长方形

圆

圆角长方形

菱形

• 关于 Mermaid 语法，参考 这儿,

FLowchart流程图

我们依旧会支持flowchart的流程图：

Created with Raphaël 2.2.0 开始 我的操作 确认？ 结束 yes no

• 关于 Flowchart流程图 语法，参考 这儿.

导出与导入

导出

如果你想尝试使用此编辑器, 你可以在此篇文章任意编辑。当你完成了一篇文章的写作, 在上方工具栏找到 文章导出 ，生成一个.md文件或者.html文件进行本地保存。

导入

如果你想加载一篇你写过的.md文件或者.html文件，在上方工具栏可以选择导入功能进行对应扩展名的文件导入，
继续你的创作。

---

1. mermaid语法说明 ↩︎

2. 注脚的解释 ↩︎