I am working with reading information from an Identity Card using the Tesseract Library. I received a confidence rating of each word or each line.
Box[0]: x=13, y=12, w=1134, h=57, confidence: 40, text: REPUYBLIQUE FRANCAISE Box[1]: x=21, y=75, w=1119, h=50, confidence: 42, text: 7 NN99 3W F 59W Box[2]: x=17, y=137, w=539, h=52, confidence: 30, text: V7 7 D5 NOM1BOHEL Box[3]: x=6, y=189, w=954, h=46, confidence: 0, text: Box[4]: x=12, y=239, w=1016, h=34, confidence: 40, text: 5 Q HV2 H CHRISTIANL NICBLE HBNIOIJE Box[5]: x=21, y=310, w=975, h=53, confidence: 67, text: 2 E 20 06 1329 Box[6]: x=28, y=372, w=1043, h=83, confidence: 0, text: Box[7]: x=11, y=397, w=1147, h=67, confidence: 0, text: Box[8]: x=251, y=461, w=837, h=46, confidence: 0, text: Box[9]: x=157, y=475, w=1019, h=105, confidence: 0, text: Box[10]: x=59, y=648, w=1045, h=32, confidence: 81, text: IDFRADOUEL<<<<<<<<<<<<<<<<<<<<932013 Box[11]: x=57, y=722, w=1047, h=34, confidence: 76, text: 0506932020438CHRISTIANE<<NI2906209F3
The code is used here.
Pix *image = pixRead("/usr/src/tesseract-3.02/phototest.tif"); tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI(); api->Init(NULL, "eng"); api->SetImage(image); Boxa* boxes = api->GetComponentImages(tesseract::RIL_TEXTLINE, true, NULL, NULL); printf("Found %d textline image components.\n", boxes->n); for (int i = 0; i < boxes->n; i++) { BOX* box = boxaGetBox(boxes, i, L_CLONE); api->SetRectangle(box->x, box->y, box->w, box->h); char* ocrResult = api->GetUTF8Text(); int conf = api->MeanTextConf(); fprintf(stdout, "Box[%d]: x=%d, y=%d, w=%d, h=%d, confidence: %d, text: %s", i, box->x, box->y, box->w, box->h, conf, ocrResult); }
Now I need to read all the words from the identification card. But I set the value of tesseract :: RIL_TEXTLINE as tesseract :: RIL_WORD and ran the code. I got high certainty, even the words there are not in the image.
1.Is a confidence indicator used to read information from an Identity card.?
1. What is the actual score returned from Tesseract OCR.?