Fingerprint sensing using measuring configurations with different principal directions of extensions

A method of determining a representation of a fingerprint pattern of a finger using a fingerprint sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each comprising a finger electrode spaced apart from said finger by a dielectric structure,

• said method comprising the steps of, for each measurement position in a plurality of measurement positions:
• providing a first measuring element configuration comprising:
• a first set of sensing measuring elements defining an elongated first measuring arrangement portion including said measurement position and having a first principal direction of extension, the finger electrode of each measuring element in said first set of sensing measuring elements exhibiting a first time-varying sensing finger electrode potential;
• and
• a first set of peripheral measuring elements defining a first peripheral measuring arrangement portion at least partly surrounding said first measuring arrangement portion, the finger electrode of each measuring element in said first set of peripheral measuring elements exhibiting a first peripheral finger electrode potential different from said first sensing finger electrode potential;
• acquiring, using said first measuring element configuration, a first measurement value for said measurement position;
• providing a second measuring element configuration comprising:
• a second set of sensing measuring elements defining an elongated second measuring arrangement portion including said measurement position and having a second principal direction of extension different from said first principal direction of extension, the finger electrode of each measuring element in said second set of sensing measuring elements exhibiting a second time-varying sensing finger electrode potential;
• and
• a second set of peripheral measuring elements defining a second peripheral measuring arrangement portion at least partly surrounding said second measuring arrangement portion, the finger electrode of each measuring element in said second set of peripheral measuring elements exhibiting a second peripheral finger electrode potential different from said second sensing finger electrode potential;
• and
• acquiring, using said second measuring element configuration, a second measurement value for said measurement position, wherein said method further comprises the steps of:
• determining a combined measurement value for each of said measurement positions based on said first measurement value and said second measurement value for each of said measurement positions;
• and
• determining said representation of the fingerprint pattern based on said combined measurement value for each of said measurement positions.