APPARATUS AND METHOD FOR SCANNING IMAGE IN IMAGE PROCESSING SYSTEM

• US 20120154207A1
• Filed: 12/21/2011
• Published: 06/21/2012
• Est. Priority Date: 12/21/2010
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Kwang-Seon, Kim, Bong-Su, Kang, Min-Soo, Byun, Woo-Jin
• Application Number:
  US13/333,250
• Publication Number:
  US 20120154207A1
• Time in Patent Office: Days
• US Class Current: 342/179
• CPC Class Codes: G01S 13/24 using frequency agility of carrier wave
• CPC Class Codes: G01S 13/887 for detection of concealed objects, e.g. contraband or weapons
• CPC Class Codes: G01S 13/89 for mapping or imaging

Abstract

Disclosed is an image scanning apparatus in an image processing system, including: a frequency signal generator configured to synthesize at least two single frequency signals; a frequency up converter configured to up-convert and transmit the synthesized single frequency signals; a frequency down converter configured to down-convert and receive frequency signals reflected from an object by the up-converted frequency signals; a frequency sorter configured to sort the down-converted frequency signals so as to correspond to the at least two single frequency signals; a multiple frequency processor configured to generate a transfer function by performing parallel processing on each of the sorted frequency signals; and an image processing unit configured to generate an image of the object by using the transfer function.

Claims

1. An image scanning apparatus in an image processing system, comprising:

a frequency signal generator configured to synthesize at least two single frequency signals;

a frequency up converter configured to up-convert and transmit the synthesized single frequency signals;

a frequency down converter configured to down-convert and receive frequency signals reflected from an object by the up-converted frequency signals;

a frequency sorter configured to sort the down-converted frequency signals so as to correspond to the at least two single frequency signals;

a multiple frequency processor configured to generate a transfer function by performing parallel processing on each of the sorted frequency signals; and

an image processing unit configured to generate an image of the object by using the transfer function.

2. The image scanning apparatus of claim 1, further comprising:

a local oscillator configured to output a local oscillation signal to each of the frequency up converter and the frequency down converter for the frequency up conversion and the frequency down conversion.

3. The image scanning apparatus of claim 1, wherein the frequency generator includes:

a frequency generation unit configured to generate the at least two single frequency signals;

an amplitude/phase control unit configured to control at least one of an amplitude and a phase of each of the at least two single frequency signals; and

a synthesis frequency signal generation unit configured to synthesize the single frequency signals of which at least one of the amplitude and phase is controlled.

4. The image scanning apparatus of claim 3, wherein the frequency sorter includes:

a filter unit configured to filter the down frequency signal so as to correspond to the at least two single frequency signals;

a mixing unit configured to mix each of the single frequency signals of which at least one of the amplitude and phase is controlled with each of the filtered frequency signals; and

an analog to digital conversion unit configured to convert the mixed frequency signals into digital signals.

5. The image scanning apparatus of claim 1, wherein the frequency generator includes:

an amplitude/phase control unit configured to generate the at least two single frequency signals by a control of at least on of the amplitude and phase;

an inverse fast Fourier conversion unit configured to perform inverse fast Fourier transform on the at least two single frequency signals;

a digital to analog conversion unit configured to convert the signals subjected to the inverse fast Fourier transform into analog signals corresponding to each of the in-phase (I) and quadrature phase (Q); and

a first clock signal generation unit configured to provide a first clock signal for synchronization acquisition according to signal conversion in the inverse fast Fourier conversion unit and the digital to analog conversion unit.

6. The image scanning apparatus of claim 1, wherein the frequency sorter includes:

a filter unit configured to filter the down-converted frequency signals into signals corresponding to each of the in-phase and quadrature phase;

an analog to digital conversion unit configured to convert each of the filtered signals into digital signals;

an fast Fourier conversion unit configured to perform the fast Fourier transform on each of the signals converted into the digital signals; and

a second clock signal generation unit configured to provide a second clock signal for synchronization acquisition according to signal conversion in the analog to digital conversion unit and the fast Fourier conversion unit.

7. The image scanning apparatus of claim 1, wherein the frequency up converter includes a transmitter antenna transmitting the up frequency signal.

8. The image scanning apparatus of claim 1, wherein the frequency down converter includes a receiver antenna transmitting the down frequency signal.

9. The image scanning apparatus of claim 1, further comprising:

a display device configured to display the image.

10. The image scanning apparatus of claim 1, wherein the at least two single frequencies are a frequency signal in a microwave band.

11. The image scanning apparatus of claim 1, further comprising:

a sensor unit configured to acquire at least one information of a height and a diameter of the object and provide the acquired information to the image processing unit.

12. The image scanning apparatus of claim 11, wherein the image processing unit generates the image by using the information acquired by the sensor unit.

13. An image scanning method in an image processing system, comprising:

generating at least single frequencies;

synthesizing the least two single frequency signals;

up-converting the synthesized single frequency signals;

transmitting the up-converted frequency signals;

receiving frequency signals reflected from an object by the up frequency signals;

down-converting the received frequency signal;

sorting the down-converted frequency signals so as to correspond to the at least two single frequency signals; and

generating an image by performing parallel processing on the sorted frequency signals.

14. The method of claim 13, wherein the synthesizing includes:

controlling at least one of an amplitude and a phase of each of the at least two single frequency signals; and

synthesizing the single frequency signals of which at least one of the amplitude and phase is controlled.

15. The method of claim 14, wherein the sorting includes:

filtering the down-converted frequency signals so as to correspond to the at least two single frequency signals;

mixing each of the filtered frequency signals with each of the single frequency signals of which at lease one of the amplitude and phase are controlled; and

converting each of the mixed frequency signals into the digital signals.

16. The method of claim 13, wherein the synthesizing includes:

controlling at least one of the amplitude and phase of each of the at least two single frequency signals;

converting the signals subjected to a inverse fast Fourier transform into analog signals corresponding to each of the in-phase (I) and the quadrature phase (Q).

17. The method of claim 16, wherein the sorting includes:

filtering the down-converted frequency signals into signals corresponding to each of the in-phase and quadrature phase;

converting each of the signals corresponding to the in-phase and the quadrature phase into digital signals; and

performing the fast Fourier transform on the converted digital signals.

18. The method of claim 13, further comprising:

displaying the generated image.

19. The method of claim 13, wherein the at least two single frequencies are a frequency signal in a microwave band.