MinCol = 30 # seen that all digits start at 30th column # no need for additional computation # find the boundaries where digits present in the image array = np.

Finally, labels in foreComps are added to the foreground in binaryImage and other labels discarded(added to background). Than the min_connected_len thanks to CC_STAT_AREA. Knowing the labels of connected components we can choose those have areas(number of pixels) greater (0 being the background) and numLabel is the number of connected components. Here, labelImage is a matrix same size with the threshImage where each pixel of the certain connected component has the value of its own label Using OpenCV’s connectedComponentsWithStats function we can find threshImage’s connected components with stats associated with it.įind connected components of the image. array ( labelImage ) for k in : binaryImage = 255 CV_32S ) # holds if component will be included to foreground foreComps = >= min_connected_len ] # Get binary image after erasing some connected components those areas under the threshold binaryImage = np. connectedComponentsWithStats ( threshImage, 8, cv2. Min_connected_len = 15 # get connected components numLabel, labelImage, stats, centroids = cv2. We could have as many samples we want but decided thatĪround five thousand would be enough in our purpose. Click bot basically refreshed the page and downloaded the captcha to a folder every time. Since we wanted to break a specific website’s captchas, we downloaded thousands of The very first step of the project is to create a dataset to work on with.

pytorch used for training the model that will autonomously breaks captchas.

denoising the images and separating the digits.

opencv and numpy are used in image processing i.e.

To accomplish our goal we used python(3) and following libraries I hope this helps someone out there with a similar goal and if you have any suggestions feel free to contact.

So I decided to write a tutorial that breaks down the steps we took. Throughout the process we have learned a lot, It was a fun project and a nice opportunity to put our knowledge into a real-world example. Captcha Breaking Tutorial This tutorial shows the steps we have used to break simple captchas with image processing and machine learning.Ī few months ago me and my friend decided to work on a project that breaks annoying captchas

Image recaptcha bypass