Apparatus detecting motion of image data and detecting method thereof
View Patent ↗An apparatus detecting motion in image data by compressing and encoding and a method thereof. The motion detecting apparatus has a separation unit, an operation unit and a comparison unit. The separation unit separates a bit stream in relation to a motion predicted image from a compressed encoded image bit stream. The operation unit calculates an average value of the bit stream in relation to the motion predicted image separated at the separation unit. The comparison unit detects a motion when the average value is greater than a predetermined threshold after comparing the average value and the threshold. Thus, because a motion in an input image can be detected by using a compressed encoded image bit stream, a separate circuit or input image processing is not required to detect the motion and adverse affects of camera noise on the detection results can be reduced.
1. An apparatus detecting a motion in an image data, comprising:
a separation unit separating a bit stream in relation to a motion predicted image from a compressed image bit stream;
an operation unit calculating an average value of the bit stream in relation to the motion predicted image; and
a comparison unit comparing the calculated average value and a predetermined threshold to output a motion detecting signal when the average value is greater than the predetermined threshold.
2. The apparatus detecting a motion in an image data of claim 1 , wherein the motion predicted image is an inter mode image.
3. The apparatus detecting a motion in an image data of claim 1 , further comprising an output unit outputting a warning signal in response to the motion detecting signal from the comparison unit.
4. The apparatus detecting a motion in an image data of claim 1 , further comprising a transmission unit transmitting the image data with the detected motion in response to the motion detecting signal.
5. An apparatus detecting a motion in an image data, comprising:
a separation unit separating a bit stream in relation to a motion predicted image from a compressed image bit stream;
an operation unit calculating an average value in relation to the motion predicted image and a changing ratio of the average value; and
a comparison unit comparing the changing ratio of the average value and a predetermined threshold to output a motion detecting signal when the changing ratio is greater than the threshold.
6. The apparatus of detecting a motion in an image data of claim 5 , wherein the motion predicted image is an inter mode image.
7. The apparatus of detecting a motion in an image data of claim 5 , further comprising an output unit outputting a warning signal in response to the motion detecting signal from the comparison unit.
8. The apparatus of detecting a motion in an image data of claim 5 , further comprising a transmission unit transmitting the image data with the detected in response to the motion detecting signal.
9. A method of detecting a motion in an image data, comprising:
separating a bit stream of a motion predicted image from a compressed bit stream;
calculating an average value of the bit stream of the motion predicted image; and
detecting the motion in the image data when the average value is greater than a predetermined threshold after comparing the average value and the threshold.
10. The method of detecting a motion in an image data of claim 9 , further comprising outputting a motion detecting signal in response to a detected motion.
11. The method of detecting a motion in an image data of claim 10 , further comprising transmitting the image data with the detected motion in response to the motion detecting signal.
12. A method of detecting a motion in an image data, comprising:
separating a bit stream of a motion predicted image from a compressed bit stream;
calculating a changing ratio of an average value of the bit stream of the motion predicted image; and
detecting the motion of the image data when the changing ratio is greater than a predetermined threshold after comparing the changing ratio and the threshold.
13. The method of detecting a motion in an image data of claim 12 , further comprising outputting a motion detecting signal in response to a detected motion.
14. The method of detecting a motion in an image data of claim 13 , further comprising transmitting an image data with the detected motion in response to the motion detecting signal.
15. A network image monitoring system compressing image signals and detecting a motion in a frame image, comprising:
an image input unit transmitting the image signals; and
a programmed computer processor generating a compressed bit stream, separating a bit stream of a motion predicted image from the compressed bit stream, calculating an average value of the bit stream of the motion predicted image, and detecting a motion in the frame image based upon the calculated average value.