Inspection apparatus, method for controlling the same, and storage medium

1. An inspection apparatus comprising:

a memory storing instructions; and

a processor that implements the instructions to:

obtain a correct image for comparison against an inspection target image read from a print sheet;

extract a first coordinate group indicating an outside edge of the correct image from a feature point of the correct image, wherein the first coordinate group corresponds to four corners of outside edges of the correct image;

identify a rectangular region including the first coordinate group of the four corners; and

extract a second coordinate group indicating an inspection region, which is disposed inside a predetermined value from the rectangular region.

2. The inspection apparatus according to claim 1 ,

wherein the processor implements the instructions to further control a display to display:

the inspection region superimposed on the correct image; and

a setting screen that allows the inspection region to be changeable in accordance with a user input.

3. The inspection apparatus according to claim 2 , wherein in the setting screen, the predetermined value is settable in accordance with the user input.

4. The inspection apparatus according to claim 2 , wherein in the setting screen, a level at which to detect an abnormality in an inspection is settable in accordance with the user input.

5. The inspection apparatus according to claim 4 , wherein in the setting screen:

an individual partial region inside of the inspection region is settable; and

the level is individually settable for the partial region.

6. The inspection apparatus according to claim 2 , wherein the setting screen allows acceptance of an instruction to copy an inspection region set for a predetermined correct image to another correct image in a state where a plurality of correct images are obtained.

7. The inspection apparatus according to claim 6 , wherein:

the processor implements the instructions to further, in a state where the instruction is accepted, extract a third coordinate group that is most inward among inspection regions corresponding to respective obtained correct images, and

the inspection region includes the extracted third coordinate group.

8. The inspection apparatus according to claim 2 , wherein the predetermined value is determined in accordance with a type of a print sheet on which the inspection target image is printed.

9. The inspection apparatus according to claim 8 , wherein the predetermined value is determined in accordance with a basis weight of the print sheet on which the inspection target image is printed.

10. The inspection apparatus according to claim 2 , wherein the processor obtains the correct image from image data obtained by reading a predetermined printed material.

11. The inspection apparatus according to claim 2 , wherein the processor obtains the correct image from a RIP image for printing in a printing apparatus that prints a printed material as an inspection target.

12. The inspection apparatus according to claim 2 , further comprising:

scanner that scans a printed material of an inspection target,

wherein the processor implements the instructions to further perform inspection of the inspection target image by comparing the inspection target image, which is read by the scanner, and the correct image, in accordance with the inspection region.

13. A method of controlling an inspection apparatus, the method comprising:

obtaining a correct image for comparison against an inspection target image read from a print sheet;

extracting a first coordinate group indicating an outside edge of the correct image from a feature point of the correct image, wherein the first coordinate group corresponds to four corners of outside edges of the correct image;

identifying a rectangular region including the first coordinate group of the four corners; and

extracting a second coordinate group indicating an inspection region, which is disposed inside a predetermined value from the rectangle region.

14. A non-transitory computer-readable storage medium storing a program executable by a computer to execute a method of controlling an inspection apparatus, the method comprising:

obtaining a correct image for comparison against an inspection target image read from a print sheet;

extracting a first coordinate group indicating an outside edge of the correct image from a feature point of the correct image, wherein the first coordinate group corresponds to four corners of outside edges of the correct image;

identifying a rectangular region including the first coordinate group of the four corners; and

extracting a second coordinate group indicating an inspection region, which is disposed inside a predetermined value from the rectangle region.