The card, with a picture of Brussels sprouts on the front, is made from potato starch paper and printed with food colouring instead of ink.

Sheet image format, the author mainly use BMP format, just easy to read in the "drawing" behind software, sheet for modification of candidate number error.

Choose the "marking" option, then choose "sheet to read" option, import batch marking scanning good sheet in front of the picture, after import the sheet can see the results from grade (figure 5).