System for embedding authentication information into image and image alteration detecting system
A technology for changing detection and image, applied in transmission system, image communication, digital transmission system, etc., can solve digital image problems and other problems
Inactive Publication Date: 2002-09-18
IBM CORP
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[0003] On the other hand, digital images taken as evidence can cause problems because digital data is prone to changes such as combining without leaving any traces
This kind of problem may not happen often when taking pictures as a hobby for general users, but it can become a serious problem when taking pictures for commercial purposes
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[0036] figure 2 is a block diagram of the digital camera image processing system in this embodiment. The subject is connected by the CCD2 through an optical system to an analog electrical signal. This signal is processed by image processor 27, and this processor has: signal processing unit 23, area division unit 24, hidden unit 25, and area combination unit 26, this signal is output as the image data D ' of digital signal, and Stored in memory 28 such as a memory card. Since this image data D' contains a hash value embedded in a predetermined image area in the image data D by the hidden unit 25, this data cannot be completely identical to the image data D, although it cannot be distinguished visually. kind of difference.
[0037] The image data D, which is the output of the signal processing unit 23, is divided by the area dividing unit 24 into two areas. image 3 It is a conceptual view used to illustrate the division and combination of image regions. The image D as (a)...
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A digital camera has means to authentication information into a photographed image for detecting the identity of the image. The authentication information supplied integrally with the image data, so that, the verifier can verify the image data without saving the authentication information. This is achieved by having a region dividing unit 24 for dividing the image into a first image region and a second image region in response to the digital signal, authentication information generating means 29 for generating authentication information from data in the first image region, encrypting means 30 for encrypting the authentication information, hiding means 25 for embedding the encrypted authentication information into the second image region by operating the data in the second image region, and region combining means 26 for combining the first image region in the image with the second image region in which the authentication information is embedded. <IMAGE>
Description
technical field [0001] This invention relates to systems for embedding abstracts in images, and more particularly to digital cameras for adding authentication information to photographic images. technical background [0002] Recently, digital cameras have rapidly come into widespread use. A digital camera is used to photograph a scene or the like and store the scene as digital data in a memory card or the like. The reason for the rapid and widespread application of digital cameras is naturally the decline in the price of main components and their outstanding portability, but more importantly, the photos taken can be saved as digital images. Digital data is easy to process its content by a computer etc., and is easy to spread through a network etc. Accordingly, the demand for digital cameras that can simply provide such digital images is expected to grow. [0003] On the other hand, digital images photographed as evidence may cause problems because digital data are easily ...
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Patent Timeline
Login to View More IPC IPC(8): H04N5/225G06T1/00H04N1/32H04N1/387H04N7/167H04N7/18H04N21/4405H04N21/4623H04N21/83
CPCG06T1/0028G06T2201/0065H04N1/32144H04N2101/00H04N2201/3233H04N2201/3236H04N2201/327H04N2201/3281H04N1/40H04N5/265H04N23/00
Inventor 清水周一沼尾雅之森本典繁
Owner IBM CORP