Changed threshold init value to 150. Fixed an error on apertouDois: (tesseract to self.tesseract).  Edited the Setting’s method changer range to not print squares if the other method is selected. Erased “findSqaures:” and added findAndDrawSheet:, which uses Hough Tranform to find lines at cv::Mat, but it is not fully implemented ‘cause there are error when we draw the lines at the screen.