Method and device for embedding information in input image and extracting information from input image
A technology for inputting images and background images, which is applied in the field of image processing, can solve the problems that the file image is no longer complete, the encryption function cannot be applied, etc., and achieve the effect of fast and correct calibration
Inactive Publication Date: 2013-06-12
PRIMAX ELECTRONICS LTD
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[0003] In addition, in some known technologies, the encrypted information is distributed in the image of the entire document, and when the printed document is trimmed, the encrypted function cannot be applied to the trimmed image because the document image itself is no longer complete. on file
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[0056] Please refer to figure 1 , which is a schematic diagram of an image output device 100 implemented according to an embodiment of the present invention. The image output device 100 includes a processing circuit 110 , a data block generating circuit 120 and an output circuit 130 . The processing circuit 110 receives an input information S in , and input information S according to a conversion comparison table T1 in Each character in is converted into a corresponding symbol (symbol) S1. In this embodiment, the conversion comparison table T1 is an American Standard Code for Information Interchange (ASCII) comparison table, however, this is not used to limit the scope of the present invention, as long as it can be used to represent characters Code, can be used to apply as conversion comparison table T1. The data block generating circuit 120 is used for inputting information S in to determine the size of a data block B1, and use a sequence comparison table T2 to set the i...
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The invention discloses a method and device for embedding information in an input image and extracting information from the input image. Information embedded in the input image in the method includes a plurality of characters, and the method comprises the steps of receiving the information by using one processing circuit, and converting each character in the information into one corresponding symbol according to a conversion contrast table; according to a sequence contrast table, setting the symbol corresponding to each character in the information, in the conversion contrast table, at the position of a data block to generate the data block; and adding the data block in the input image at least. The invention provides a simple and fast method and device, which can embed information in theinput image of a file and extract information from the input image of the file on the premise of not influencing the readability of the file.
Description
technical field [0001] The present invention relates to image processing, in particular to a method for embedding information into an input image, a method for extracting information from an input image, and related devices. Background technique [0002] In general printing technology, users often need to encrypt the printed documents to ensure the confidentiality of the documents and prevent important documents from being embezzled or copied. Next, modify the pixels in an image, for example: slightly change the lowest bit value of a pixel, or increase or decrease the number of pixels and arrange specific pixel positions. However, the known technologies usually only have a very small information capacity or require a large number of calculations or even sacrifice the readability of the file to achieve the above effects. How to apply a simple and fast method to ensure the confidentiality of files is still a big topic in this field. [0003] In addition, in some known techno...
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IPC IPC(8): G06T1/00
Inventor 黄英杰彭博俞王圣斌
Owner PRIMAX ELECTRONICS LTD