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這種情況是這樣的,我有一個圖像,我只想從中提取文本進一步OCR處理,我試圖通過侵蝕和擴張去除徽標,但它失敗時,卡有一個圖像在它的背景或卡被分成2種不同的顏色,所以我認爲要計算卡的直方圖,然後過濾文本,因爲它將在背景或任何其他非文本區域中具有最小峯值,我得到這個opencv代碼來計算直方圖圖像如何從圖像的直方圖過濾感興趣的對象?
OpenCV的代碼:
IplImage* trueColorImage = cvLoadImage("plastics.jpg");
TrueColorIplImg=[self CreateIplImageFromUIImage:trueColorImage];
IplImage* channel = cvCreateImage(cvGetSize(TrueColorIplImg), 8, 1);
IplImage *hist_img = cvCreateImage(cvSize(300,240), 8, 1);
cvSet(hist_img, cvScalarAll(255), 0);
CvHistogram *hist_red;
CvHistogram *hist_green;
CvHistogram *hist_blue;
int hist_size = 256;
float range[]={0,256};
float* ranges[] = { range };
float max_value = 0.0;
float max = 0.0;
float w_scale = 0.0;
hist_red = cvCreateHist(1, &hist_size, CV_HIST_ARRAY, ranges, 1);
hist_green = cvCreateHist(1, &hist_size, CV_HIST_ARRAY, ranges, 1);
hist_blue = cvCreateHist(1, &hist_size, CV_HIST_ARRAY, ranges, 1);
cvSetImageCOI(TrueColorIplImg,3);
cvCopy(TrueColorIplImg,channel);
cvResetImageROI(TrueColorIplImg);
cvCalcHist(&channel, hist_red, 0, NULL);
cvSetImageCOI(TrueColorIplImg,2);
cvCopy(TrueColorIplImg,channel);
cvResetImageROI(TrueColorIplImg);
cvCalcHist(&channel, hist_green, 0, NULL);
cvSetImageCOI(TrueColorIplImg,1);
cvCopy(TrueColorIplImg,channel);
cvResetImageROI(TrueColorIplImg);
cvCalcHist(&channel, hist_blue, 0, NULL);
cvGetMinMaxHistValue(hist_red, 0, &max_value, 0, 0);
cvGetMinMaxHistValue(hist_green, 0, &max, 0, 0);
max_value = (max > max_value) ? max : max_value;
cvGetMinMaxHistValue(hist_blue, 0, &max, 0, 0);
max_value = (max > max_value) ? max : max_value;
cvScale(hist_red->bins, hist_red->bins, ((float)hist_img->height)/max_value, 0);
cvScale(hist_green->bins, hist_green->bins, ((float)hist_img->height)/max_value, 0);
cvScale(hist_blue->bins, hist_blue->bins, ((float)hist_img->height)/max_value, 0);
printf("Scale: %4.2f pixels per 100 units\n", max_value*100/((float)hist_img->height));
w_scale = ((float)hist_img->width)/hist_size;
for(int i = 0; i < hist_size; i++)
{
cvRectangle(hist_img, cvPoint((int)i*w_scale , hist_img->height),
cvPoint((int)(i+1)*w_scale, hist_img->height - cvRound(cvGetReal1D(hist_red->bins,i))),
CV_RGB(255,0,0), -1, 8, 0);
cvRectangle(hist_img, cvPoint((int)i*w_scale , hist_img->height),
cvPoint((int)(i+1)*w_scale, hist_img->height - cvRound(cvGetReal1D(hist_green->bins,i))),
CV_RGB(0,255,0), -1, 8, 0);
cvRectangle(hist_img, cvPoint((int)i*w_scale , hist_img->height),
cvPoint((int)(i+1)*w_scale, hist_img->height - cvRound(cvGetReal1D(hist_blue->bins,i))),
CV_RGB(0,0,255), -1, 8, 0);
}
這是真棒,在一個頁面中的所有武器。一個大+1這一點。 – 2012-04-25 14:48:10