using?System;
using?System.Collections.Generic;
using?System.IO;
using?System.Text;

using?OpenCvSharp;
using?OpenCvSharp.Extensions;
using?OpenCvSharp.Utilities;

namespace?OpenCvRotate
{
	class?Program
	{
		static?void?Main（string[]?args）
		{
			//以灰度方式讀入原文件
			string?filename?=?“source.jpg“;
			var?src?=?IplImage.FromFile（filename?LoadMode.GrayScale）;

			//轉換到合適的大小，以適應快速變換
			int?width?=?Cv.GetOptimalDFTSize（src.Width）;
			int?height?=?Cv.GetOptimalDFTSize（src.Height）;
			var?padded?=?new?IplImage（width?height?BitDepth.U8?1）;
			Cv.CopyMakeBorder（src?padded?new?CvPoint（0?0）?BorderType.Constant?CvScalar.ScalarAll（0））;

			//實部、虛部（單通道）
			var?real?=?new?IplImage（padded.Size?BitDepth.F32?1）;
			var?imaginary?=?new?IplImage（padded.Size?BitDepth.F32?1）;
			//合并（雙通道）
			var?fourier?=?new?IplImage（padded.Size?BitDepth.F32?2）;

			//圖像復制到實部，虛部清零
			Cv.ConvertScale（padded?real）;
			Cv.Zero（imaginary）;

			//合并、變換、再分解
			Cv.Merge（real?imaginary?null?null?fourier）;
			Cv.DFT（fourier?fourier?DFTFlag.Forward）;
			Cv.Split（fourier?real?imaginary?null?null）;

			//計算sqrt（re^2+im^2），再存回re
			Cv.Pow（real?real?2.0）;
			Cv.Pow（imaginary?imaginary?2.0）;
			Cv.Add（real?imaginary?real）;
			Cv.Pow（real?real?0.5）;

			//計算log（1+re），存回re
			Cv.AddS（real?CvScalar.ScalarAll（1）?real）;
			Cv.Log（real?real）;

			//歸一化，落入0-255范圍
			Cv.Normalize（real?real?0?255?NormType.MinMax）;

			//把低頻移動到中心
			ShiftDFT（real）;

			//二值化，以150作為分界點，經驗值，需要根據實際情況調整
			Cv.Threshold（real?real?150?255?ThresholdType.Binary）;

			//由于HoughLines2方法只接受8UC1格式的圖片，因此進行轉換
			var?gray?=?new?IplImage（real.Size?BitDepth.U8?1）;
			Cv.ConvertScale（real?gray）;

			//找直線，threshold參數取100，經驗值，需要根據實際情況調整
			var?storage?=?Cv.CreateMemStorage（）;
			var?lines?=?Cv.HoughLines2（gray?storage?HoughLinesMethod.Standard?1?Cv.PI?/?180?100）;

			//找到符合條件的那條斜線
			float?angel?=?0f;
			float?piThresh?=?（float）Cv.PI?/?90;
			float?pi2?=?（float）Cv.PI?/?2;
			for?（int?i?=?0;?i?			{
				//極坐標下的點，X是極徑，Y是夾角，我們只關心夾角
				var?p?=?lines.GetSeqElem（i）;
				float?theta?=?p.Value.Y;

				if?（Math.Abs（theta）?>=?piThresh?&&?Math.Abs（theta?-?pi2）?>=?piThresh）
				{
					angel?=?theta;
					break;
				}
			}
			angel?=?angel?			Cv.ReleaseMemStorage（storage）;

			//轉換角度
			if?（angel?!=?pi2）
			{
				float?angelT?=?（float）（src.Height?*?Math.Tan（angel）?*?1.0?/?src.Width）;
				angel?=?（float）Math.Atan（angelT）;
			}
			float?angelD?=?angel?*?180?/?（float）Cv.PI;

			//旋轉
			var?center?=?new?CvPoint2D32f（src.Width?/?2.0?src.Height?/?2.0）;
			var?rotMat?=?Cv.GetRotationMatrix2D（center?angelD?1.0）;
			var?dst?=?new?IplImage（src.Size?BitDepth.U8?1）;
			Cv.WarpAffine（src?dst?rotMat?Interpolation.Cubic?|?Interpolation.FillOutliers?CvScalar.ScalarAll（255））;

			Console.WriteLine（“如果旋轉失敗，說明HoughLines2方法未檢測到直線，請適當調整源碼66行的最后一個參

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

????..A..H.?????36864??2017-07-25?09:22??OpenCvRotate\.vs\OpenCvRotate\v14\.suo

?????文件????1013248??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\OpenCvSharpExtern.dll

?????文件????1200128??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_calib3d2410.dll

?????文件????1403904??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_contrib2410.dll

?????文件????2573824??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_core2410.dll

?????文件?????868864??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_features2d2410.dll

?????文件????9720042??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_ffmpeg2410_64.dll

?????文件?????656384??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_flann2410.dll

?????文件?????482304??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_gpu2410.dll

?????文件????2410496??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_highgui2410.dll

?????文件????2236416??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_imgproc2410.dll

?????文件????1489408??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_legacy2410.dll

?????文件?????597504??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_ml2410.dll

?????文件?????657408??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_nonfree2410.dll

?????文件?????805888??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_objdetect2410.dll

?????文件????2967040??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_ocl2410.dll

?????文件?????235008??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_photo2410.dll

?????文件????1228800??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_stitching2410.dll

?????文件?????716800??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_superres2410.dll

?????文件?????443904??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_video2410.dll

?????文件?????632320??2015-06-04?04:55??OpenCvRotate\bin\dll\x64\opencv_videostab2410.dll

?????文件???????6656??2017-07-25?09:24??OpenCvRotate\bin\OpenCvRotate.exe

?????文件??????13824??2017-07-25?09:24??OpenCvRotate\bin\OpenCvRotate.pdb

?????文件??????22688??2017-07-25?09:24??OpenCvRotate\bin\OpenCvRotate.vshost.exe

?????文件????????490??2016-07-16?19:44??OpenCvRotate\bin\OpenCvRotate.vshost.exe.manifest

?????文件??????40960??2015-06-08?11:12??OpenCvRotate\bin\OpenCvSharp.Blob.dll

?????文件?????496640??2015-06-08?11:12??OpenCvRotate\bin\OpenCvSharp.dll

?????文件??????35840??2015-06-08?11:12??OpenCvRotate\bin\OpenCvSharp.Extensions.dll

?????文件??????13312??2015-06-08?11:12??OpenCvRotate\bin\OpenCvSharp.UserInterface.dll

?????文件?????319692??2013-11-02?00:11??OpenCvRotate\bin\source.jpg

............此處省略30個文件信息