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#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <leptonica/allheaders.h>
#include <tesseract/baseapi.h>
#include <vector>
#include "../include/libchelleport.h"
OCRMatch *findWordCoordinates(const char *image_path, int *size) {
std::vector<OCRMatch> matches;
MEASURE("OCR", { matches = extractTextCoordinates(image_path); });
std::cout << "Word count: " << matches.size() << std::endl;
static OCRMatch *ptr = new OCRMatch[matches.size()];
std::copy(matches.begin(), matches.end(), ptr);
*size = matches.size();
return ptr;
}
std::vector<OCRMatch> extractTextCoordinates(const char *imagePath) {
std::vector<OCRMatch> results;
auto tesseract = initializeTesseract();
if (tesseract == nullptr)
return results;
Pix *image = loadImage(imagePath);
if (image == nullptr)
return results;
// printf("imagePath: %s\n", imagePath);
// pixWrite(imagePath, image, IFF_JFIF_JPEG);
tesseract->SetImage(image);
tesseract->Recognize(0);
tesseract::ResultIterator *iterator = tesseract->GetIterator();
auto level = RESULT_ITER_MODE;
if (iterator != 0) {
do {
if (iterator->Confidence(level) > CONFIDENCE_THRESHOLD) {
const char *word = iterator->GetUTF8Text(level);
if (word != nullptr && strlen(word) >= MIN_CHARACTER_COUNT) {
int x1, y1, x2, y2;
iterator->BoundingBox(level, &x1, &y1, &x2, &y2);
OCRMatch match({(int)(x1 / scaleFactor), (int)(y1 / scaleFactor),
(int)(x2 / scaleFactor), (int)(y2 / scaleFactor),
word});
results.push_back(match);
}
}
} while (iterator->Next(level));
}
delete iterator;
tesseract->End();
delete tesseract;
pixDestroy(&image);
return results;
}
inline tesseract::TessBaseAPI *initializeTesseract() {
auto *tesseract = new tesseract::TessBaseAPI();
tesseract->SetPageSegMode(tesseract::PSM_AUTO);
if (tesseract->Init(nullptr, "eng", tesseract::OEM_LSTM_ONLY)) {
std::cerr << "Could not initialize tesseract." << std::endl;
return nullptr;
}
return tesseract;
}
inline Pix *loadImage(const char *imagePath) {
Pix *image = pixRead(imagePath);
if (!image) {
std::cerr << "Could not load image " << imagePath << std::endl;
return nullptr;
}
preprocessImage(&image);
return image;
}
void preprocessImage(Pix **image) {
Pix *temp;
// Scale
if (scaleFactor != 1) {
INLINE_IMAGE_PROC(pixScale(*image, scaleFactor, scaleFactor));
}
// Grayscale
if (pixGetDepth(*image) > 8) {
INLINE_IMAGE_PROC(pixConvertRGBToGray(
*image, grayscaleWeightRed, grayscaleWeightGreen, grayscaleWeightBlue));
}
// Contrast
pixContrastTRC(*image, *image, contrast);
// Sharpness
// INLINE_IMAGE_PROC(pixUnsharpMaskingGrayFast(*image, 1, sharpness, 1));
INLINE_IMAGE_PROC(pixUnsharpMasking(*image, 1, sharpness));
}
void printMatch(const OCRMatch &match) {
std::cout << "Text: " << match.text << "; Position: (" << match.startX << ","
<< match.startY << ") -> (" << match.endX << "," << match.endY
<< ")" << std::endl
<< std::endl;
}
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