US 12,488,607 B2
Image processing apparatus, method of controlling image processing apparatus, and storage medium
Takuya Saito, Chiba (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 24, 2023, as Appl. No. 18/173,854.
Claims priority of application No. 2022-032669 (JP), filed on Mar. 3, 2022.
Prior Publication US 2023/0281948 A1, Sep. 7, 2023
Int. Cl. G06V 30/162 (2022.01); G06T 5/40 (2006.01); G06V 10/28 (2022.01); G06V 30/10 (2022.01); G06V 30/18 (2022.01)
CPC G06V 30/162 (2022.01) [G06T 5/40 (2013.01); G06V 10/28 (2022.01); G06V 30/10 (2022.01); G06V 30/18086 (2022.01)] 7 Claims
OG exemplary drawing
 
6. A method of controlling an image processing apparatus, comprising:
calculating a density value histogram based on an acquired scanned image;
setting a necessary area density that has a predetermined value range around a most frequently appearing density value having a highest appearance frequency in the density value histogram, and setting a threshold value for binarization based on the necessary area density; and
controlling execution of binarization processing for correcting an area of the scanned image, in which density values are equal to or higher than the threshold value, to black, and correcting an area of the scanned image, in which density values are lower than the threshold value, to white,
wherein the scanned image is an image generated by reading an answer sheet, and
wherein the method includes
controlling whether or not to execute the binarization processing based on information indicating an answer format of the answer sheet, and
controlling whether or not to execute the binarization processing, on an answer field-by-an answer field basis, for the answer sheet.