1. An image processing apparatus comprising: an acquisition unit that acquires a scanned image of an original; a specification unit that specifies, in said scanned image, a first region including a specific form pattern with digital information embedded therein and a second region not including said specific form pattern; an image processing unit that applies image processing to said scanned image, wherein said image processing unit applies different processing to said first region and said second region, respectively; wherein said image processing unit applies specific image working processing included in said image processing to said first region and to said second region, respectively; in said specific image working processing, a working degree to said first region and a working degree to said second region are different from each other; and an extraction unit that analyzes said specific form pattern and extracts said digital information, wherein said image processing unit changes the working degree to said first region in accordance with an error detection ratio during the extraction of said digital information.