Yes, you’re still doing all the work on the UI thread. Using async isn’t going to automatically offload the work onto different threads. You could do this though: private async void button2_Click(object sender, EventArgs e) { string file = files[0]; Task<string> task = Task.Run(() => ProcessFile(file)); rtTextArea.Text = await task; } private string ProcessFile(string file) … Read more
Use pytesseract.image_to_data() import pytesseract from pytesseract import Output import cv2 img = cv2.imread(‘image.jpg’) d = pytesseract.image_to_data(img, output_type=Output.DICT) n_boxes = len(d[‘level’]) for i in range(n_boxes): (x, y, w, h) = (d[‘left’][i], d[‘top’][i], d[‘width’][i], d[‘height’][i]) cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2) cv2.imshow(‘img’, img) cv2.waitKey(0) Among the data returned by pytesseract.image_to_data(): … Read more
I see steps are scattered in different answers. Based on my recent experience with this pytesseract error on Windows, writing different steps in sequence to make it easier to resolve the error: 1. Install tesseract using windows installer available at: https://github.com/UB-Mannheim/tesseract/wiki 2. Note the tesseract path from the installation. Default installation path at the time … Read more
In short, you would have to train the Tesseract engine to recognize the handwriting. Take a look at this link: Tesseract handwriting with dictionary training This is what the linked post says: It’s possible to train tesseract to recognize handwriting. Here are the instructions: https://tesseract-ocr.github.io/tessdoc/Training-Tesseract But don’t expect very good results. Academics have typically gotten … Read more
Like you I also faced many problems implementing OCR in Android, but after much Googling I found the solution, and it surely is the best example of OCR. Let me explain using step-by-step guidance. First, download the source code from https://github.com/rmtheis/tess-two. Import all three projects. After importing you will get an error. To solve the … Read more
I got this error because I installed pytesseract with pip but forget to install the binary. On Linux sudo apt update sudo apt install tesseract-ocr sudo apt install libtesseract-dev On Mac brew install tesseract On Windows download binary from https://github.com/UB-Mannheim/tesseract/wiki. then add pytesseract.pytesseract.tesseract_cmd = ‘C:\\Program Files (x86)\\Tesseract-OCR\\tesseract.exe’ to your script. (replace path of tesseract binary … Read more
Create a config file (e.g “letters”) in tessdata/configs directory – usually /usr/share/tesseract/tessdata/configs or /usr/share/tesseract-ocr/tessdata/configs And add this line to the config file: tessedit_char_whitelist abcdefghijklmnopqrstuvwxyz …or maybe [a-z] works. I don’t know. Then call tesseract similar to this: tesseract input.tif output nobatch letters That will limit tesseract to recognize only the wanted characters.
fix DPI (if needed) 300 DPI is minimum fix text size (e.g. 12 pt should be ok) try to fix text lines (deskew and dewarp text) try to fix illumination of image (e.g. no dark part of image) binarize and de-noise image There is no universal command line that would fit to all cases (sometimes … Read more
tesseract-4.0.0a supports below psm. If you want to have single character recognition, set psm = 10. And if your text consists of numbers only, you can set tessedit_char_whitelist=0123456789. Page segmentation modes: 0 Orientation and script detection (OSD) only. 1 Automatic page segmentation with OSD. 2 Automatic page segmentation, but no OSD, or OCR. 3 Fully … Read more