Surveillance camera and digital video recorder

1. A surveillance apparatus comprising:

an analog-to-digital converter configured to convert an analog video signal, of at least one image of a region captured by an optical system, into digital video data of the region; and

a main controller comprising at least one processor configured to detect a current motion region from the digital video data of the region, remove a high frequency component of the digital video of the region except the current motion region, and transmit the digital video data of the region, from which the high frequency component is removed, to a target device over a communication network,

wherein the main controller is further configured to detect a predetermined target in the current motion region after detecting the current motion region,

wherein if the current motion region is detected from the digital video data of the region, and the predetermined target is detected in the current motion region, the main controller performs low pass filtering on the digital video data of the region except the current motion region, to remove the high frequency component of the digital video of the region except the current motion region,

wherein if the current motion region is detected from the digital video data of the region, and the predetermined target is not detected in the current motion region, the main controller performs low pass filtering on the digital video data of the region including the current motion region, to remove a high frequency component of the digital video data of the region including the current motion region, and

wherein the low-pass filtering is variably determined according to a number of motions previously occurred in the region except the current motion region.

2. The surveillance apparatus of claim 1 , wherein the low pass filtering is an operation in which pixel values of the digital video data of the region except the current motion region are multiplied by a filter coefficient, and

wherein the filter coefficient varies according to the number of motions previously occurred in the region except the current motion region so that image resolution or sharpness of the region except the current motion region varies according to the number of motions previously occurred in the region except the current motion region.

3. The surveillance apparatus of claim 1 , wherein if the current motion region is not detected from the digital video data of the region, the main controller performs low pass filtering on the digital video data of the region to remove a high frequency component of the digital video data of the region.

4. The surveillance apparatus of claim 1

wherein the low pass filtering is an operation in which pixel values of the digital video data of the region except the current motion region are multiplied by a filter coefficient, and

wherein the filter coefficient is variably determined according to the number of motions previously occurred in the region except the current motion region.

5. The surveillance apparatus of claim 4 , wherein the filter coefficient is proportional to the number of motions previously occurred in the region except the current motion region.

6. The surveillance apparatus of claim 1 , wherein the main controller is further configured to compress the digital video data of the region.

7. The surveillance apparatus of claim 1 , wherein if the current motion region is detected from the digital video data of the region, the main controller compresses the digital video data on which the low pass filtering is performed without compressing the digital video data on which the low pass filtering is not performed.

8. The surveillance apparatus of claim 1 , wherein the surveillance apparatus is a camera comprising the optical system.

9. The surveillance apparatus of claim 1 , wherein the apparatus is a digital video recorder configured to receive the analog video signal from at least one camera.

10. A method of processing video data:

converting an analog video signal, of at least one image of a region captured by an optical system, into digital video data of the region;

detecting a current motion region from the digital video data of the region;

removing a high frequency component of the digital video of the region except the current motion region if the current motion region is detected; and

transmitting the digital video data, from which the high frequency component is removed, to a target device over a communication network,

wherein the method further comprises:

detecting a predetermined target in the current motion region after detecting the current motion region;

if the current motion region is detected in the digital video data of the region, and the predetermined target is detected from the current motion region, performing low pass filtering on the digital video data of the region except the current motion region, to remove the high frequency component of the digital video of the region except the current motion region; and

if the current motion region is detected from the digital video data of the region, and the predetermined target is not detected in the current motion region, performing low pass filtering on the digital video data of the region including the current motion region, to remove a high frequency component of the digital video data of the region including the current motion region, and

wherein the low-pass filtering is variably determined according to a number of motions previously occurred in the region except the current motion region.

11. The method of claim 10 , wherein the low pass filtering is an operation in which pixel values of the digital video data of the region except the current motion region are multiplied by a filter coefficient, and

wherein the filter coefficient varies according to a number of motions previously occurred in the region except the current motion region so that image resolution or sharpness of the region except the current motion region varies according to the number of motions previously occurred in the region except the current motion region.

12. The method of claim 10 , further comprising low pass filtering on the digital video data of the region to remove a high frequency component of the digital video data of the region, if the current motion region is not detected from the digital video data of the region.

13. The method of claim 10 , wherein the low pass filtering is an operation in which pixel values of the digital video data of the region except the current motion region are multiplied by a filter coefficient.

14. The method of claim 13 , wherein the filter coefficient is variably determined according to the number of motions previously occurred in the region except the current motion region.

15. The method of claim 10 , further comprising compressing the digital video data of the region.

16. The method of claim, 10 further comprising, if the current motion region is detected from the digital video data of the region, compressing the digital video data on which the low pass filtering is performed without compressing the digital video data on which the low pass filtering is not performed.

17. A non-transitory computer recording medium having recorded thereon a program for executing the method of claim 10 .

18. The surveillance apparatus of claim 1 , wherein the low pass filtering is an operation in which pixel values of the digital video data of the region except the current motion region are multiplied by a filter coefficient, and

wherein the filter coefficient is variably determined according to the number of motions previously occurred in the region except the current motion region.

19. The surveillance apparatus of claim 18 , wherein the filter coefficient is proportional to the number of motions previously occurred in the region except the current motion region.

20. The method of claim 14 , wherein the filter coefficient is proportional to the number of motions previously occurred in the region except the current motion region.