OpenCV - hothero's TechNote

OpenCV haartraining (Rapid Object Detection With A Cascade of Boosted Classifiers Based on Haar-like Features)

延續上一篇Manually Compiling and Installing OpenCV on Mac / Windows Without Package Manager，假設讀者已安裝OpenCV開發環境與command line指令設定。此篇以 Tutorial: OpenCV haartraining (Rapid Object Detection With A Cascade of Boosted Classifiers Based on Haar-like Features) 和 Creating a haar cascade classifier aka haar training 為基礎撰寫。偵測物圖片蒐集首先，要偵測的物體圖片是少不了的。假設我們要偵測的是一個原子筆，

mac

Manually Compiling and Installing OpenCV on Mac / Windows Without Package Manager

OpenCV的全稱是Open Source Computer Vision Library，是一個跨平台的計算機視覺庫。OpenCV是由英特爾公司發起並參與開發，以BSD許可證授權發行，可以在商業和研究領域中免費使用。OpenCV可用於開發實時的圖像處理、計算機視覺以及模式識別程序。 (from wiki) 這篇將帶領讀者編譯OpenCV並且安裝相關執行檔與開發所用的標頭檔（如：確保pkg-config --cflags opencv, pkg-config --libs opencv正常），若是用"brew install opencv"則不會安裝cv.h等c/cpp開發用標頭檔。 Environments: Mac OSX 10.7.* ( & Windows 7 32/64 bits) (Visual Studio 2010)

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[Snippets]C# - 仿sikuli式的利用擷取圖片做按鍵精靈

最近有個需求是得去點擊某個程式的一些按鈕，但寫死座標位置使程式沒有彈性不是我的風格，最後就決定結合影像技術的方向來做一個仿sikuli利用截圖來點擊的偽按鍵精靈。以下是一些完成這目的的片段程式碼： Screenshot ``` int screenWidth = Screen.GetBounds(new Point(0, 0)).Width; int screenHeight = Screen.GetBounds(new Point(0, 0)).Height; Bitmap bmpScreenShot = new Bitmap(screenWidth, screenHeight); // the final image used by memory reference Graphics gfx = Graphics.FromImage((Image)bmpScreenShot); gfx.CopyFromScreen(

TroubleShooting

TrubleShooting : OpenCV "the node does not represent a user object" & "unresolved external symbol _cvHaarDetectObjects referenced"

Development Environment : MATLAB R2011a OpenCV 2.2 Mex "the node does not represent a user object" Solution: [Option]refer this official article step 11 The error looks like this: Unspecified error (The node does not represent a user object (unknown type?)) in function cvRead,

OpenCV

Build opencv 2.2 using mex with VS2010 on matlab r2011a

網路上這類文章不下少數，而本篇文章將著重在如何將opencv2.2版利用VS2010的編譯器，用mex編成matlab r2011a版可呼叫的file（新版本所修改的地方）。（註：mex為一編譯器，可將c/c++程式編成為matlab執行檔）編mex不外乎幾個步驟：安裝Visual Studio 2010, MATLAB r2011a, opencv 2.2 setup matlab中的mex 可參考：http://blog.yam.com/dainn/article/26676311 編輯matlab的mexopts.bat ( C:\Users\hothero\AppData\Roaming\MathWorks\MATLAB\R2011a ) 在"set MATLAB=%MATLAB%

C#

opencv on vs2010 c# using EmguCV

Download single executable file to install EmguCV download link website Add the two files Emgu.Utils.dll and Emgu.CV.dll to References of the project. as well. A guide You can use this declaration using Emgu.CV; using Emgu.CV.Structure; If get

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