Step 1: Tresholding the image
                - using a static treshold level

Step 2: Determine the boundary of the cards
                (picture of 5 poker cards)

Step 3: Extract the symbols of the cards

Step 4: Analyzing the symbols:

•   determine the mean of each symbol
•   determine and analize the distances between the mean centers
•   short distance => the necesarry symbols from the left (or right) corner of the cards are detected

Step 5: Determine the shape of the cards using pattern matching on the extracted symbols