Image processing apparatus and control method therefor

A control method for an image processing apparatus,

• the method comprising:
• an acquisition step of acquiring a statistical value of pixel values for each divided region obtained by dividing an input image;
• a determination step of comparing for each divided region the statistical value of the divided region acquired in the acquisition step with a first threshold and determining whether the divided region is a color region or a monochrome region;
• and
• a re-determination step of comparing a statistical value of an adjacent divided region, which is a divided region, from among divided regions determined in the determination step as monochrome regions, that is adjacent to the divided region determined in the determination step as a color region, with a second threshold, by which a divided region is more likely determined as a color region than by the first threshold, for each adjacent divided region, and re-determining whether the adjacent divided region is a color region or a monochrome region.

An image processing apparatus that divides an input image into a color region and a monochrome region,

• the apparatus comprising:
• an acquisition unit that acquires a statistical value of pixel values for each divided region obtained by dividing the input image;
• a division unit that divides the input image into a color region and a monochrome region on the basis of the statistical value for each divided region acquired by the acquisition unit;
• and
• a movement unit that moves a boundary between the color region and the monochrome region, which are divided by the division unit, so that the boundary passes inside a boundary proximity region, which is a region separated from the boundary by a predetermined distance toward a monochrome region, when a brightness value of the boundary proximity region is lower than a predetermined value.

A control method for an image processing apparatus that divides an input image into a color region and a monochrome region,

• the control method comprising:
• an acquisition step of acquiring a statistical value of pixel values for each divided region obtained by dividing the input image;
• a division step of dividing the input image into a color region and a monochrome region on the basis of the statistical value for each divided region acquired in the acquisition step;
• and
• a movement step of moving a boundary between the color region and the monochrome region, which are divided in the division step, so that the boundary passes inside a boundary proximity region, which is a region separated from the boundary by a predetermined distance toward a monochrome region, when a brightness value of the boundary proximity region is lower than a predetermined value.