Motion detection apparatus and motion detection method
First Claim
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1. A motion detection apparatus for detecting motion of an inputted image, comprising:
- reference image storage means for storing the image as a reference image to be used as a reference for detection of motion;
updating means for updating the reference image stored in said reference image storage means, said updating means being operable in at least three alternative updating modes;
an unconditional updating mode in which the reference image is periodically updated, a conditional updating mode in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited, and an updating inhibition mode in which the reference image is not updated;
current image storage means for storing an image inputted now as a current image;
motion detection means for comparing the current image stored in said current image storage means with the reference image stored in said reference image storage means and detecting motion of the image based on a result of the comparison; and
extension means for extending an interval within which motion of the image is detected by said motion detection means by a predetermined extension time.
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Abstract
A motion detection system for detecting motion in input images. One of the input images is stored for use as a reference image for motion detection processing. The reference image is updated according to any one of a multiple of possible updating modes. Images input after establishment of the reference image are compared to the reference image and the detection of motion in the input images is based on the comparison. The interval in which motion in the input images is detected is extended according to a predetermined extension time.
74 Citations
29 Claims
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1. A motion detection apparatus for detecting motion of an inputted image, comprising:
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reference image storage means for storing the image as a reference image to be used as a reference for detection of motion; updating means for updating the reference image stored in said reference image storage means, said updating means being operable in at least three alternative updating modes;
an unconditional updating mode in which the reference image is periodically updated, a conditional updating mode in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited, and an updating inhibition mode in which the reference image is not updated;current image storage means for storing an image inputted now as a current image; motion detection means for comparing the current image stored in said current image storage means with the reference image stored in said reference image storage means and detecting motion of the image based on a result of the comparison; and extension means for extending an interval within which motion of the image is detected by said motion detection means by a predetermined extension time. - View Dependent Claims (2, 3)
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4. A motion detection method for detecting motion of an inputted image, comprising the steps of:
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storing an image inputted as a reference image to be used as a reference for detection of motion; storing an inputted image as a current image; comparing the reference image and the current image with each other and detecting motion of the image based on a result of the comparison; extending an interval within which motion of the image is detected by a predetermined time; and updating the reference image according to one of at least three alternative updating procedures;
periodically updating the reference image;
periodically updating the reference image until motion is detected whereupon updating of the reference image is inhibited, and not updating the reference image.
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5. A motion detection apparatus for detecting motion of an inputted image, comprising:
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reference image storage means for storing the image as a reference image to be used as a reference for detection of motion; updating means for updating the reference image stored in said reference image storage means, said updating means being operable in at least three alternative updating modes;
an unconditional updating mode in which the reference image is periodically updated, a conditional updating mode in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited, and an updating inhibition mode in which the reference image is not updated;current image storage means for storing an image inputted now as a current image; motion detection means for comparing the current image stored in said current image storage means with the reference image stored in said reference image storage means and detecting motion of the image based on a result of the comparison; and selection means for selecting an updating method of the reference image by said updating means from among a plurality of methods. - View Dependent Claims (6)
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7. In a motion detection method for a motion detection apparatus which includes reference image storage means for storing an inputted image as a reference image to be used as a reference for detection of motion, updating means for updating the reference image stored in said reference image storage means, current image storage means for storing an image inputted now as a current image, and motion detection means for comparing the current image stored in said current image storage means with the reference image stored in said reference image storage means and detecting motion of the image based on a result of the comparison, the improvement wherein
an updating method of the reference image by said updating means is selectable from among at least three updating methods: - an unconditional updating method in which the reference image is periodically updated, a conditional updating method in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited, and an updating inhibition method in which the reference image is not updated.
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8. A motion detection apparatus for detecting motion of an inputted image, comprising:
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reference image storage means for storing the image as a reference image to be used as a reference for detection of motion; updating means for updating the reference image stored in said reference image storage means, said updating means being operable in at least three updating modes;
an unconditional updating mode in which the reference image is periodically updated, a conditional updating mode in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited and an updating inhibition mode in which the reference image is not updated;current image storage means for storing an image inputted now as a current image; brightness information comparison means for comparing brightness information regarding brightness of the current image stored in said current image storage means and the reference image stored in said reference image storage means to each other; color information comparison means for comparing color information regarding colors of the current image stored in said current image storage means and the reference image stored in said reference image storage means to each other; and motion detection means for detecting motion of the image based on results of the comparison by both of said brightness information comparison means and said color information comparison means. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A motion detection method for detecting motion of an inputted image, comprising the steps of:
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storing the image as a reference image to be used as a reference for detection of motion and storing an image inputted now as a current image; updating the reference image according to one of at least three alternative updating methods;
an unconditional updating method in which the reference image is periodically updated, a conditional updating method in which the reference image is periodically updated until motion is detected whereupon updating of the reference image is inhibited, and an updating inhibition method in which the reference image is not updated;comparing brightness information regarding brightness of the reference image and the current image with each other and comparing color information regarding a color between the reference image and the current image with each other; and detecting motion of the image based on both results of the comparison.
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Specification