IOS開發 使用OpenCV做圖片比對

由於上篇介紹基礎 OpenCV的應用,這次來試看看圖片比對,廢話不多說,先ＰＯ出結果,在ＰＯ重要的程式碼,(由於只是測試所以沒有針對程式碼做優化).

展示圖：

        



程式碼：

- (void)viewDidLoad {

    [super viewDidLoad];

   

    //由Ａ圖比對Ｂ圖

   

    //Ａ圖

    UIImage *mImage =  [UIImage imageNamed:@"pic.JPG"];

    [self.imageView setImage:mImage];

    srcIpl = [self convertToIplImage:[self useImage:mImage]];

    IplImage *dscIpl = cvCreateImage(cvGetSize(srcIpl), srcIpl->depth, 1);

    IplImage *dscIplNew = cvCreateImage(cvGetSize(srcIpl),  IPL_DEPTH_8U, 3);

    cvCvtColor(dscIpl, dscIplNew, CV_GRAY2BGR);

   

    //Ｂ圖

    UIImage *tempImage = [UIImage imageNamed:@"tmpPic.JPG"];

    [self.tmpImageView setImage:tempImage];

    iplTempImage = [self convertToIplImage:[self useImage:tempImage]];

   

   

    // Do any additional setup after loading the view from its nib.

}

-(IplImage*)cropIplImage:(IplImage*)srcIpl withStartPoint:(CvPoint)mPoint withWidth:(int)width withHeight:(int)height

{

    //裁切後的圖片

    IplImage *cropImage;

    cvSetImageROI(srcIpl, cvRect(mPoint.x, mPoint.y, width, height));

    cropImage = cvCreateImage(cvGetSize(srcIpl), IPL_DEPTH_8U, 3);

    cvCopy(srcIpl, cropImage);

    cvResetImageROI(srcIpl);

    return cropImage;

}

// 多通道彩色圖片的直方圖比對

-(double)CompareHist:(IplImage*)image1 withParam2:(IplImage*)image2

{

    int hist_size = 256;

    IplImage *gray_plane = cvCreateImage(cvGetSize(image1), 8, 1);

    cvCvtColor(image1, gray_plane, CV_BGR2GRAY);

    CvHistogram *gray_hist = cvCreateHist(1, &hist_size, CV_HIST_ARRAY);

    cvCalcHist(&gray_plane, gray_hist);

   

    IplImage *gray_plane2 = cvCreateImage(cvGetSize(image2), 8, 1);

    cvCvtColor(image2, gray_plane2, CV_BGR2GRAY);

    CvHistogram *gray_hist2 = cvCreateHist(1, &hist_size, CV_HIST_ARRAY);

    cvCalcHist(&gray_plane2, gray_hist2);

    double rst =cvCompareHist(gray_hist, gray_hist2, CV_COMP_BHATTACHARYYA);

    printf("比對結果=%f\n",rst);

    return rst;

}

結論：

1.關於圖片比對,看來只用於人臉辨識比較有用,不適用在一般風景圖等的圖片上使用.

2.這部分只針對單機使用,您可以把圖片Ｂ換成你喜歡的 ,我只做換圖片Ａ來做測試,但如果遇到情況是需要跟雲端上圖片做比對,來顯示圖片資料的情況,我覺得乾脆把圖片上傳到雲端做完比對,再回傳手機上可能比較快吧,如果前輩們有更好的方法,還請賜教啊,這邊實驗到這邊ＸＤ.

範例檔案：下載

參考範例：

1.https://cg2010studio.com/2013/03/22/opencv-iplimage-和-mat-互轉/

2.https://read01.com/5Mg3do.html

3.http://docs.opencv.org/2.4/search.html?q=IplImage&check_keywords=yes&area=default