Image processing apparatus and image processing method

An image processing apparatus adapted to inspect an image, the image processing apparatus comprising:

• an acquisition unit configured to acquire image data obtained by reading the image;
• a setting unit configured to set a file parameter for performing a filtering process on the image data;
• a processing unit configured to perform a predetermined process on the image data in accordance with the file parameter set by the setting unit;
• and
• an extracting unit configured to extract a unique portion caused by a device to print the image from image data resulting from performing the predetermined process,
• wherein:
• the predetermined process includes
• the filtering process in accordance with the file parameter set by the setting unit,
• a quantization process for quantizing values obtained by the filtering process, and
• an addition process for adding values obtained by differentiating the file parameter in the filtering process and performing the quantization process, and
• the setting unit sets a first file parameter for the predetermined process for a first area that is associated with the device in occurrence position of the unique portion and a second file parameter for a second area other than the first area independently.

An image processing method adapted to inspect an image, the image processing method comprising:

• an acquisition step of acquiring image data obtained by reading the image;
• a setting step of setting a division way for dividing the image data;
• a processing step of dividing the image data in accordance with the division way set in the setting step, and performing a predetermined process on each of resulting division areas;
• and
• an extracting step of extracting a unique portion caused by a device to print the image from image data resulting from performing the predetermined process,
• wherein:
• the predetermined process includes
• an averaging process on each of division areas obtained by dividing the image data in accordance with the division way set by the setting step,
• a quantization process for quantizing values obtained by the averaging process, and
• an addition process for adding values obtained by differentiating the division way of the image data in the averaging process and performing the quantization process, and
• in the setting step, a first division way for the predetermined process for a first area that is associated with the device in occurrence position of the unique portion and a second division way for a second area other than the first area are set independently.

An image processing method adapted to inspect an image, the image processing method comprising:

• an acquisition step of acquiring image data obtained by reading the image;
• a setting step of setting a file parameter for performing a filtering process on the image data;
• a processing step of performing a predetermined process on the image data in accordance with the file parameter set in the setting step;
• and
• an extracting step of extracting a unique portion caused by a device to print the image from image data resulting from performing the predetermined process,
• wherein:
• the predetermined process includes
• the filtering process in accordance with the file parameter set by the setting step,
• a quantization process for quantizing values obtained by the filtering process, and
• an addition process for adding values obtained by differentiating the file parameter in the filtering process and performing the quantization process, and
• in the setting step, a first file parameter for the predetermined process for a first area that is associated with the device in occurrence position of the unique portion and a second file parameter for a second area other than the first area are set independently.