Image processing method

Abstract

The main CPU executes Fourier transform to the partial image, then performs strict spectrum analysis 1 for judging the presence/absence of data at a coordinate position designated in advance on a Fourier transform plane with high resolution for judging the presence/absence of prohibition of duplication, then judges whether duplication-prohibited data exists or not, and clears both the partial image and the document image if it is judged that duplication-prohibited data exists. If it is judged that duplication-prohibited data does not exist, the main CPU executes spectrum analysis 2 for broadly inspecting the existence of a periodic component instead of lowering the resolution from the spectrum analysis 1 and judges whether a structure other than DC component exists or not. If the existence of a minute quantity of change that could not exist in a normal image is recognized, the main CPU performs partial image processing such as amplifying the quantity of change, then superimposes it onto the document image, and supplies the image on which the superimposing processing has been executed, to an output unit and a liquid crystal display unit, thus outputting or displaying the image.

1 . An image processing method for an image processing apparatus configured to perform predetermined processing to document image data and supply the processed document image data to an output unit or a storage unit, comprising:
 judging the existence of at least one embedded data when performing processing to superimpose partial image data sliced out from a predetermined document data and the document image data, and if the existence of data indicating prohibition of duplication of the partial image data sliced out from the predetermined document data is recognized by this judgment, issuing a warning to the effect that the superimposition of the partial image data sliced out from the predetermined document data is prohibited, thus stopping the superimposing processing.   
     
     
         2 . An image processing method for an image processing apparatus configured to perform predetermined processing to document image data and supply the processed document image data to an output unit or a storage unit, comprising:
 judging the existence of at least one embedded data when performing processing to superimpose partial image data sliced out from a predetermined document data and the document image data, and if the existence of data indicating prohibition of duplication of the partial image data sliced out from the predetermined document data is recognized by this judgment, performing processing to change the partial image data sliced out from the predetermined document data to an image density different from its original image and then superimpose the image.   
     
     
         3 . An image processing method for an image processing apparatus configured to perform predetermined processing to document image data and supply the processed document image data to an output unit or a storage unit, comprising:
 judging the existence of at least one embedded data when performing processing to superimpose partial image data sliced out from a predetermined document data and the document image data, and if the existence of data indicating prohibition of duplication of the partial image data sliced out from the predetermined document data is recognized by this judgment, performing processing to reproduce in achromatic color a part that should be reproduced in chromatic color, of the partial image data sliced out from the predetermined document data.   
     
     
         4 . An image processing method for an image processing apparatus configured to perform predetermined processing to document image data and supply the processed document image data to an output unit or a storage unit, comprising:
 judging the existence of at least one embedded data when performing processing to superimpose partial image data sliced out from a predetermined document data and the document image data, and if the existence of data indicating prohibition of duplication of the partial image data sliced out from the predetermined document data is recognized by this judgment, performing processing to shift the partial image data sliced out from the predetermined document data to double positions and then superimpose the image.