Authors: Shi Jiachen Liang Yuhao Ma Pingchuan

Description: 1. preprocedure select a binary-image from four options: red-threshold, green-threshold, blue-threshold, threshold after converted into grey gradation -- remove the print or signature in different color
2. scan in line and find the thick-lines(lines that have height) that have printed words by counting the black spots and calculating the occupation of them
3. for each thick-lines, scan in column in order to find letters; because there are small space in the word between letters and also huge space between the words, comparing the length of space with the width of letters in order to split small parts in one thick-line