CN202534042U

CN202534042U - Digital watermark detection device for paper money

Info

Publication number: CN202534042U
Application number: CN2012202207402U
Authority: CN
Inventors: 张玉杰; 张媛媛
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2012-05-17
Filing date: 2012-05-17
Publication date: 2012-11-14
Anticipated expiration: 2022-05-17

Abstract

The utility model discloses a digital watermark detection device for paper money. The digital watermark detection device comprises a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) image sensor, a detection module and a display module, wherein the detection module comprises a FPGA (Field Program Gate Array) module connected with the CMOS image sensor, the FPGA module is further connected with an SRAM (Static Random Access Memory) storage unit which is connected with a DSP (Digital Signal Processor) unit, the display module comprises a liquid crystal display screen, the detection module is further connected with a computer through a RS232 interface, the CMOS image sensor is used for acquiring the image of paper money, the FPGA module is used for carrying out primary DWT (Discrete Wavelet Transform) processing on the image, and the DSP unit is used for carrying out subsequent DCT (Discrete Cosine Transform) processing to obtain an operation integrity signal. The digital watermark detection device for the paper money is embedded in a cell phone and is used for extracting and detecting a watermark through the detection module so as to compare an extracted watermark pattern with a standard watermark pattern of the paper money, and judging the paper money to be fake money if inconsistency is obtained, thus, the personal cell phone can be used for detection when the paper money is difficult to judge in authenticity in daily consumption of the mass, and convenience is brought to the life of people.

Description

Banknote digital watermarking pick-up unit

Technical field

The utility model relates to pick-up unit, is specifically related to banknote digital watermarking pick-up unit.

Background technology

Along with socioeconomic continuous development; The counterfeit money phenomenon emerges in an endless stream; The anti-counterfeit money work of people situation is increasingly serious, and counterfeit money brings inconvenience for people's life, and shopping brings inconvenience to daily life; Especially to urban petty bourgeois's life, when the authenticity of banknotes difficulty is distinguished neither one easily instrument tell truth from falsehood.

Summary of the invention

In order to overcome the shortcoming of above-mentioned prior art; The purpose of the utility model is to provide banknote digital watermarking pick-up unit; On the camera of mobile phone,, utilize the watermark detection algorithms in the mobile module to extract watermark, if detected watermark recovery is identical with original watermark pattern by the image information of cmos sensor collection banknote; Then banknote is true, otherwise banknote is false tickets.

To achieve these goals, the technical scheme of the utility model employing is:

Banknote digital watermarking pick-up unit; Comprise cmos image sensor; Detection module and display module, said detection module comprise the FPGA module that links to each other with cmos image sensor, and the FPGA module also is connected with the SRAM storage unit; The DSP processing unit that links to each other with the SRAM storage unit shows to comprise LCDs.

Said detection module also connects computing machine through the RS232 interface.

Said cmos image sensor is used for realizing obtaining of banknote image.

Said FPGA module realizes that the DWT of image just handles.

Said DSP processing unit carries out follow-up DCT to be handled, and obtains the computing complete signal.

In the said banknote digital watermarking pick-up unit embedded with mobile phone.

The beneficial effect of the utility model is:

By detection module it is carried out the extraction and the detection of watermark, the watermark recovery that extracts is compared with the standard banknote watermark recovery in the database, just be not regarded as counterfeit money if meet.Like this, ordinary populace if just can detect with own mobile phone when existing banknote hard to tell whether it is true or false, brings convenience to people's life in current consumption.

Description of drawings

Fig. 1 is the structure principle chart of the utility model.

Embodiment

In the face of the structural principle of the utility model, principle of work is described further down.

The utility model is a core with the digital watermarking algorithm, comprises the embedding and the detection algorithm of watermark information.

The embedding of watermark combines DCT (discrete cosine transform) and DWT (wavelet transform), realizes the integrity protection to picture material; Mobile module is partly taked the detection algorithm based on neural network; The color space of cmos image sensor institute images acquired belongs to rgb space; Must be converted into the yuv space of the equipment of being independent of earlier; By detection module it is carried out the extraction and the detection of watermark then, the watermark recovery that extracts is compared with the standard banknote watermark recovery in the database, just be not regarded as counterfeit money if meet.Like this, ordinary populace if just can detect with own mobile phone when existing banknote hard to tell whether it is true or false, brings convenience to people's life in current consumption.

Said cmos image sensor is used for realizing obtaining of banknote image.

Said FPGA module realizes that the DWT of image just handles.

The still image that the CMOS chip is obtained; Its quality can match in excellence or beauty with CCD, and transfers to detection module and carry out the FPGA processing, and the employing capacity is the memory bank of the SRAM of 256K * 16bit as DWT ll channel coefficient; After treating that FPGA accomplishes the DWT calculating of picture; From SRAM, take out the ll channel coefficient of DWT, carry out DCT by the DSP processing unit and handle, obtain the computing signal that finishes.

Neural network through training is extracted watermark; Testing result shows on mobile phone lattice lcd screen through system controller; Detection system also has the communication function with computing machine in addition, can download new watermark information from computer through the RS232 interface, be convenient to the renewal of watermark.

In the image capture module; The CMOS camera lens is to be used for realizing obtaining of banknote image; Read signal by cmos image sensor through simple X-Y addressing technique; Each pixel of cmos sensor all has one electric charge is converted into the amplifier of electronic signal, can on each pixel basis, carry out the amplification of signal.

Comprise FPGA module and DSP processing unit in the detection module; This high-speed hardware module of FPGA is born the rudimentary Processing tasks of image; The DWT (wavelet transform) that at first realizes image with FPGA (field programmable gate array) handles, and makes system when reducing volume of transmitted data, greatly improve real-time performance, and the DSP processing unit is controlled through software by the detection system control module; Ll channel is carried out dct transform, carry out the extraction operation of watermark by the detection system control module.

Detection module is the watermark extracting program of being write by higher level lanquage, and the original watermark information of depositing in the information and date storehouse of extracting is compared, and will compare net result and shown by the mobile phone liquid crystal display.

Claims

1. banknote digital watermarking pick-up unit; It is characterized in that, comprise cmos image sensor, detection module and display module; Said detection module comprises the FPGA module that links to each other with cmos image sensor; The FPGA module also is connected with the SRAM storage unit, and the DSP processing unit that links to each other with the SRAM storage unit shows to comprise LCDs.

2. banknote digital watermarking pick-up unit according to claim 1 is characterized in that, said detection module also connects computing machine through the RS232 interface.

3. banknote digital watermarking pick-up unit according to claim 1 is characterized in that said cmos image sensor is used for realizing obtaining of banknote image.

4. banknote digital watermarking pick-up unit according to claim 1 is characterized in that, said FPGA module realizes that the DWT of image just handles.

5. banknote digital watermarking pick-up unit according to claim 1 is characterized in that, said DSP processing unit carries out follow-up DCT to be handled, and obtains the computing complete signal.

6. according to the described banknote digital watermarking of claim 1-5 pick-up unit, it is characterized in that, in the said banknote digital watermarking pick-up unit embedded with mobile phone.