关于OpenCV Error:Assertion failed的错误

[hujilin1229]

最近在读一个程序，加上编程的基础不好，所以在板上发帖可能会有点频繁。这段程序我已经能够编译通过，不过在执行时出现了如下错误：
OpenCV Error:Assertion failed (scn ==3 || scn==4) in unknown function, file ..\..\..\modules\imgproc\src\color.cpp, line 2433
实在纠结，不知道问题出现在哪里，还请高手帮助，下面附上我的主程序

#include "cv.h"
#include "highgui.h"
#include "tld_utils.h"
#include <iostream>
#include <sstream>
#include "TLD.h"
#include "CameraDS.h"
#include <stdio.h>
using namespace cv;
using namespace std;

//Global variables
Rect box;
bool drawing_box = false;
bool gotBB = false;
bool tl = true;
bool rep = false;
bool fromfile=false;
string video;
IplImage *pFrame;

void readBB(char* file){
	ifstream bb_file (file);
	string line;
	getline(bb_file,line);
	istringstream linestream(line);
	string x1,y1,x2,y2;
	getline (linestream,x1, ',');
	getline (linestream,y1, ',');
	getline (linestream,x2, ',');
	getline (linestream,y2, ',');
	int x = atoi(x1.c_str());// = (int)file["bb_x"];
	int y = atoi(y1.c_str());// = (int)file["bb_y"];
	int w = atoi(x2.c_str())-x;// = (int)file["bb_w"];
	int h = atoi(y2.c_str())-y;// = (int)file["bb_h"];
	box = Rect(x,y,w,h);
}
//bounding box mouse callback
void mouseHandler(int event, int x, int y, int flags, void *param)
{
	switch( event )
	{
  case CV_EVENT_MOUSEMOVE:
	  if (drawing_box){
		  box.width = x-box.x;
		  box.height = y-box.y;
	  }
	  break;
  case CV_EVENT_LBUTTONDOWN:
	  drawing_box = true;
	  box = Rect( x, y, 0, 0 );
	  break;
  case CV_EVENT_LBUTTONUP:
	  drawing_box = false;
	  if( box.width < 0 ){
		  box.x += box.width;
		  box.width *= -1;
	  }
	  if( box.height < 0 ){
		  box.y += box.height;
		  box.height *= -1;
	  }
	  gotBB = true;
	  break;
	}
}

void print_help(char** argv){
	printf("use:\n     %s -p /path/parameters.yml\n",argv[0]);
	printf("-s    source video\n-b        bounding box file\n-tl  track and learn\n-r     repeat\n");
}

void read_options(int argc, char** argv,VideoCapture& capture,FileStorage &fs)
{
	for (int i=0;i<argc;i++)
	{
		if (strcmp(argv[i],"-b")==0)
		{
			if (argc>i)
			{
				readBB(argv[i+1]);
				gotBB = true;
			}
			else
				print_help(argv);
		}
		if (strcmp(argv[i],"-s")==0)
		{
			if (argc>i){
				video = string(argv[i+1]);
				capture.open(video);
				fromfile = true;
			}
			else
				print_help(argv);

		}
		if (strcmp(argv[i],"-p")==0)
		{
			if (argc>i)
			{
				fs.open(argv[i+1], FileStorage::READ);
			}
			else
				print_help(argv);
		}
		if (strcmp(argv[i],"-no_tl")==0)
		{
			tl = false;
		}
		if (strcmp(argv[i],"-r")==0)
		{
			rep = true;
		}
	}
}

int main(int argc,char * argv[])
{
	CCameraDS camera;
	VideoCapture capture;
	//capture.open(0);

	FileStorage fs;
	//Read options
	read_options(argc,argv,capture,fs);
	//Init camera
	if(!camera.OpenCamera(0, true))
	//if (!capture.isOpened())
	{
		cout << "capture device failed to open!" << endl;
		return 1;
	}
	//Register mouse callback to draw the bounding box
	cvNamedWindow("TLD",CV_WINDOW_AUTOSIZE);
	cvSetMouseCallback( "TLD", mouseHandler, NULL );
	//TLD framework
	TLD tld;
	//Read parameters file
	tld.read(fs.getFirstTopLevelNode());
	Mat frame;
	Mat last_gray;
	Mat first;
	if (fromfile)
	{
		capture >> frame;
		cvtColor(frame, last_gray, CV_RGB2GRAY);
		frame.copyTo(first);
	}
	else//从摄像头读取
	{
			//capture.set(CV_CAP_PROP_FRAME_WIDTH,340);
			//capture.set(CV_CAP_PROP_FRAME_HEIGHT,240);
		pFrame = camera.QueryFrame();
		first=pFrame;
	}

	///Initialization
GETBOUNDINGBOX:
	while(!gotBB)
	{
		if (!fromfile)
		{
			capture >> frame;
		}
		else
			//first.copyTo(frame);
			frame=pFrame;

		cvtColor(frame, last_gray, CV_RGB2GRAY);
		drawBox(frame,box);
		imshow("TLD", frame);
		if (cvWaitKey(33) == 'q')
			return 0;
	}
	if (min(box.width,box.height)<(int)fs.getFirstTopLevelNode()["min_win"])
	{
		cout << "Bounding box too small, try again." << endl;
		gotBB = false;
		goto GETBOUNDINGBOX;
	}
	//Remove callback
	cvSetMouseCallback( "TLD", NULL, NULL );
	printf("Initial Bounding Box = x:%d y:%d h:%d w:%d\n",box.x,box.y,box.width,box.height);
	//Output file
	FILE  *bb_file = fopen("bounding_boxes.txt","w");
	//TLD initialization
	tld.init(last_gray,box,bb_file);

	///Run-time
	Mat current_gray;
	BoundingBox pbox;
	vector<Point2f> pts1;
	vector<Point2f> pts2;
	bool status=true;
	int frames = 1;
	int detections = 1;
REPEAT:
	while(capture.read(frame))
	{
		//get frame
		cvtColor(frame, current_gray, CV_RGB2GRAY);
		//Process Frame
		tld.processFrame(last_gray,current_gray,pts1,pts2,pbox,status,tl,bb_file);
		//Draw Points
		if (status){
			drawPoints(frame,pts1);
			drawPoints(frame,pts2,Scalar(0,255,0));
			drawBox(frame,pbox);
			detections++;
		}
		//Display
		imshow("TLD", frame);
		//swap points and images
		swap(last_gray,current_gray);
		pts1.clear();
		pts2.clear();
		frames++;
		printf("Detection rate: %d/%d\n",detections,frames);
		if (cvWaitKey(33) == 'q')
			break;
	}
	if (rep)
	{
		rep = false;
		tl = false;
		fclose(bb_file);
		bb_file = fopen("final_detector.txt","w");
		//capture.set(CV_CAP_PROP_POS_AVI_RATIO,0);
		capture.release();
		capture.open(video);
		goto REPEAT;
	}
	fclose(bb_file);
	return 0;
}

[txwd0033]

OpenCV中你用cvtColor(frame, current_gray, CV_RGB2GRAY);在转彩色到灰度的时候， 要求frame是3通道或者4通道的， 你看看你的frame是彩图吗？

[gglong]

hello 楼主解决这个问题了吗？ 我也遇到相同的问题了

[Best_]

“opencv error assertion failed (scn == 3 scn == 4) in unknown function”，出现这种问题，基本上是由于cvtColor()使用不当造成的，主要有两种情况： 第一种如2楼所述，图像通道没设置对； 第二种，如果程序运行到某一帧frame为空的情况下，再执行cvtColor(frame, current_gray, CV_RGB2GRAY)也会报错。

[ganruan]

楼主，你好！请问你的问题是怎么解决的啊 ？

[zjlgzhh]

我也遇到了这个问题，楼主是怎么解决的？

[frank1208]

我也遇到这个问题了，同求大神支招呀。