US 11,880,004 B2
Method for determining the quality of an imaging plate and imaging plate scanner therefor
Axel Schramm, Ilsfeld (DE); Matthias Beck, Löschgau (DE); Bernd Philipps, Untergruppenbach (DE); Michael Weber, Burgstetten (DE); Herbert Häntsch, Beilstein (DE); and Alexander Ladikos, Eching (DE)
Assigned to DÜRR DENTAL SE, Bietigheim-Bissingen (DE)
Appl. No. 16/647,447
Filed by Dürr Dental SE, Bietigheim-Bissingen (DE)
PCT Filed Sep. 13, 2018, PCT No. PCT/EP2018/074830
§ 371(c)(1), (2) Date Mar. 13, 2020,
PCT Pub. No. WO2019/053171, PCT Pub. Date Mar. 21, 2019.
Claims priority of application No. 10 2017 121 338.4 (DE), filed on Sep. 14, 2017.
Prior Publication US 2020/0278459 A1, Sep. 3, 2020
Int. Cl. G06T 7/00 (2017.01); G06T 7/13 (2017.01); G01T 1/20 (2006.01)
CPC G01T 1/2014 (2013.01) [G06T 7/0004 (2013.01); G06T 7/13 (2017.01); G06T 2207/30168 (2013.01)] 20 Claims
OG exemplary drawing
1. A method for determining quality of an imaging plate, the method comprising:
carrying out an exposure of the imaging plate;
carrying out a scan of the imaging plate in order to determine an image;
removing markings from the image to generate a preprocessed image;
determining a local signal-to-noise ratio for each pixel of a plurality of pixels of the preprocessed image using an associated averaging array comprising a local subset of the plurality of pixels;
marking a first subset of the plurality of pixels for which their local signal-to-noise ratios are below a threshold value;
carrying out an edge recognition on the preprocessed image;
marking a second subset of the plurality of pixels corresponding to recognized edges; and
calculating a quality value of the imaging plate using a ratio of the first and second subsets of marked pixels to the plurality of pixels of the preprocessed image.