这个程序演示在Tesseract OCR里指定一个矩形区域进行光学字符识别。先看一下输入图片代码里第20行设置了识别区域的左上角坐标为(30,86),宽度是590高度是100.绘制到输入图片上就是下面红色标注的区域也就是第一段。程序运行后会识别红色框里的文字也就是第一段代码#include tesseract/baseapi.h #include leptonica/allheaders.h int main() { char *outText; 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 Pix *image pixRead(phototest.tif); api-SetImage(image); // Restrict recognition to a sub-rectangle of the image // SetRectangle(left, top, width, height) api-SetRectangle(30, 86, 590, 100); // Get OCR result outText api-GetUTF8Text(); printf(OCR output:\n%s, outText); // Destroy used object and release memory api-End(); delete api; delete [] outText; pixDestroy(image); return 0; }