Abstract: Method (300) and control unit (6) for monitoring shuffle quality of cards (4) during a card game. The method (300) comprises: identifying (301) each card (4) of a first round of cards; storing (302) a first sequence of the identified (301) cards (4) of the first round of cards, in the order they are discarded; identifying (303) each card (4) of a second round of cards (4), after shuffling but before being provided to one or more players; storing (304) a second sequence of the identified (303) cards (4) of the second round of cards, in the order they are provided to the one or more players; comparing (305) the stored (302) first sequence of cards (4) with the stored (304) second sequence of cards (4); detecting (306) a predetermined pattern in the second sequence of cards (4), originating from the first sequence of cards (4); and providing (307) an alert (8) when the predetermined pattern is detected (306) in the second sequence of cards (4).

Abstract: Image processing unit (3), and method (300), for detecting event data during a game round of a roulette wheel (1) via a camera (2), thereby enabling detection of a roulette wheel bias. The roulette wheel (1) comprises a ball track (11A), upon which a roulette ball (14) is brought into rotation around the roulette wheel (1), and a sloping lower ball track (11B) comprising ball deflectors (13, 15), encircling a rotor (7). The image processing unit (3) is configured for: receiving a captured image of the roulette ball (14) from the camera (2); detecting that the roulette ball (14), under influence of gravity, reaches an imaginary circle (17) encircling the ball deflectors (13, 15) of the lower ball track (11B); and determining a position where it is detected that the roulette ball (14) reaches the imaginary circle (17); and storing the determined position in a database (6).