Image processing apparatus, method of controlling the same, and storage medium

An image processing apparatus that inspects an image formed on a printing medium, comprising:

• one or more controllers including one or more processors and one or more memories, the one or more controllers being configured to:
• read an image for inspection formed on a printing medium and obtain a target image to be inspected;
• align the target image to a reference image;
• obtain a difference between the aligned target image and the reference image;
• determine whether a pixel of the target image is at or near an edge of the printing medium;
• and
• inspect for a defect in the aligned target image on a basis of the obtained difference and processing parameters,
• wherein, in the alignment of the target image, the one or more controllers changes methods for the alignment depending on whether the pixel of the target image is determined to be at or near the edge of the printing medium.

A method of controlling an image processing apparatus that inspects an image formed on a printing medium, the method comprising:

• reading an image for inspection formed on a printing medium and obtaining a target image to be inspected;
• correcting a position of a control point in the target image, from among control points disposed on the target image, at or near the edge of the printing medium, and performing alignment using the corrected control point so as to align the target image to a reference image using non-rigid body alignment;
• and
• inspecting for a defect in the target image on a basis of the aligned target image and the reference image after the alignment,
• wherein a position of a control point at or near the edge of the printing medium is corrected on a basis of an interval between adjacent control points in the target image, at or near the edge of the printing medium.

A method of controlling an image processing apparatus that inspects an image formed on a printing medium, the method comprising:

• reading an image for inspection formed on a printing medium and obtaining a target image to be inspected;
• aligning the target image to a reference image;
• obtaining a difference between the aligned target image and the reference image after the alignment;
• determining whether a pixel of the target image exists at or near an edge of the printing medium;
• and
• inspecting for a defect in the target image on a basis of the difference obtained and processing parameters,
• wherein, in the aligning, a method for the alignment is changed depending on whether the pixel of the target image is determined to exist at or near the edge of the printing medium.

A non-transitory computer-readable storage medium storing a program for causing a processor to execute a method of controlling an image processing apparatus that inspects an image formed on a printing medium, the method comprising:

• reading an image for inspection formed on a printing medium and obtaining a target image to be inspected;
• correcting a position of a control point in the target image, from among control points disposed on the disposed on the target image, at or near the edge of the printing medium, and performing alignment using the corrected control point so as to align the target image to a reference image using non-rigid body alignment;
• and
• inspecting for a defect in the target image on a basis of the aligned target image and the reference image after the alignment,
• wherein a position of a control point at or near the edge of the printing medium is corrected on a basis of an interval between adjacent control points in the target image, at or near the edge of the printing medium.

A non-transitory computer-readable storage medium storing a program for causing a processor to execute a method of controlling an image processing apparatus that inspects an image formed on a printing medium, the method comprising:

• reading an image for inspection formed on a printing medium and obtaining a target image to be inspected;
• aligning the target image to a reference image;
• obtaining a difference between the aligned target image and the reference image after the alignment;
• determining whether a pixel of the target image exists at or near an edge of the printing medium;
• and
• inspecting for a defect in the target image on a basis of the difference obtained and processing parameters,
• wherein, in the aligning, a method for the alignment is changed depending on whether the pixel of the target image is determined to exist at or near the edge of the printing medium.