Created
November 22, 2019 08:01
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Milepost digits detection
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#include <opencv2/core/core.hpp> | |
#include <opencv2/highgui/highgui.hpp> | |
#include <opencv2/opencv.hpp> | |
#include <tesseract/baseapi.h> | |
#include <leptonica/allheaders.h> | |
std::string extractIntegerFromString(string str) | |
{ | |
std::string result; | |
std::stringstream ss; | |
ss << str[0]; | |
for (int i = 1; i < str.size(); i++) { | |
ss << ' ' << str[i]; | |
} | |
/* Store the String into String Stream */ | |
/* Running loop till the end of the stream */ | |
string tempStr; | |
int found; | |
while (ss >> tempStr) { | |
/* Checking the given whether word is integer or not */ | |
if (stringstream(tempStr) >> found) { | |
result += std::to_string(found); | |
} | |
} | |
return result; | |
} | |
int main() | |
{ | |
cv::Mat img, resized, threshTop, threshBot, dilated, outTop, outBot; | |
char *outText; | |
std::string ocrOutput, finalOutput; | |
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI(); | |
// Initialize tesseract-ocr with English, without specifying tessdata path | |
if (api->Init(NULL, "eng")) { | |
fprintf(stderr, "Could not initialize tesseract.\n"); | |
exit(1); | |
} | |
// Open input image with leptonica library | |
img = cv::imread("C:/Users/super/OneDrive/Desktop/roadmark/crop.jpg",0); | |
cv::resize(img, resized, cv::Size(4 * img.cols, 4 * img.rows)); | |
cv::Rect topRoi = cv::Rect(0, 0, resized.cols, resized.rows / 2); | |
cv::Rect botRoi = cv::Rect(0, resized.rows / 2, resized.cols, resized.rows / 2); | |
cv::threshold(resized(topRoi), threshTop, 128, 255, cv::THRESH_BINARY_INV); | |
cv::threshold(resized(botRoi), threshBot, 128, 255, cv::THRESH_BINARY); | |
cv::dilate(threshTop, dilated, cv::Mat(), cv::Point(-1, -1), 3, 1, 1); | |
outTop = dilated.clone(); | |
outBot = threshBot.clone(); | |
api->SetPageSegMode(tesseract::PSM_SINGLE_LINE); | |
api->SetImage((uchar*)outTop.data, outTop.size().width, outTop.size().height, outTop.channels(), outTop.step1()); | |
ocrOutput = api->GetUTF8Text(); | |
finalOutput += extractIntegerFromString(ocrOutput); | |
api->SetImage((uchar*)outBot.data, outBot.size().width, outBot.size().height, outBot.channels(), outBot.step1()); | |
ocrOutput = api->GetUTF8Text(); | |
finalOutput += '.'+extractIntegerFromString(ocrOutput); | |
std::cout << finalOutput; | |
cv::namedWindow("out top", cv::WINDOW_AUTOSIZE); | |
cv::namedWindow("clean", cv::WINDOW_AUTOSIZE); | |
cv::namedWindow("out bot", cv::WINDOW_AUTOSIZE); | |
cv::imshow("out top", outTop); | |
cv::imshow("clean", threshTop); | |
cv::imshow("out bot", outBot); | |
cv::waitKey(0); | |
cv::destroyAllWindows(); | |
// Destroy used object and release memory | |
api->End(); | |
//delete[] outText; | |
img.release(); | |
return 0; | |
} |
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