Method and apparatus for sensing object located within visual field of imaging device
First Claim
1. An apparatus for sensing an object within an imaging field of an image pickup device, the apparatus comprising:
- a memory for storing data of a reference background picture of the imaging field;
means for inputting picture data from the image pickup device;
means for comparing the inputted picture data with the stored reference background picture data to detect a difference value between the inputted picture data and the stored reference background picture data, and to detect a polarity of the difference value;
a converter for converting the difference value into binarization data based on a difference threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field;
a calculator for calculating a similarity between the inputted picture data and the stored reference background picture data; and
a detector for sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity.
1 Assignment
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Accused Products
Abstract
An apparatus for sensing an object within an imaging field of an image pickup device includes a memory for storing data of a reference background picture of the imaging field, a device for inputting picture data from the image pickup device, a device for comparing the inputted picture data with the stored reference background picture data to detect a difference value between the inputted picture data and the stored reference background picture data, and to detect a polarity of the difference value, a converter for converting the difference value into binarization data based on a difference threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field, a calculator for calculating a similarity between the inputted picture data and the stored reference background picture data, and a detector for sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity.
72 Citations
43 Claims
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1. An apparatus for sensing an object within an imaging field of an image pickup device, the apparatus comprising:
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a memory for storing data of a reference background picture of the imaging field; means for inputting picture data from the image pickup device; means for comparing the inputted picture data with the stored reference background picture data to detect a difference value between the inputted picture data and the stored reference background picture data, and to detect a polarity of the difference value; a converter for converting the difference value into binarization data based on a difference threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field; a calculator for calculating a similarity between the inputted picture data and the stored reference background picture data; and a detector for sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity. - View Dependent Claims (2, 3)
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4. A method of sensing an object within an imaging field of an image pickup device, the method comprising the steps of:
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storing data of a reference background picture of the imaging field; reading out picture data from the image pickup device; comparing the read-out picture data with the stored reference background picture data to detect a difference value between the read-out picture data and the stored reference background picture data, and to detect a polarity of the difference value; converting the difference value into binarization data based on a difference threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field; calculating a similarity between the read-out picture data and the stored reference background picture data; and sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of sensing an object within an imaging field of an image pickup device, the method comprising the steps of:
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storing data of a plurality of pixels of a reference background picture of the imaging field; reading out picture data of a plurality of pixels from the image pickup device; comparing the data of the pixels of the read-out picture data with the data of corresponding ones of the pixels of the stored reference background picture data to detect respective difference values between the data of the pixels of the read-out picture data and the data of the corresponding one of the pixels of the stored reference background picture data, and to detect respective polarities of the difference values; converting the difference values into respective binarization data based on a difference threshold value which is changed in response to the respective polarities of the difference values so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field; calculating respective similarities between the pixels of the read-out picture data and the corresponding one of the pixels of the stored reference background picture data; and sensing whether an object is within the imaging field based on the polarities of the difference values and the similarities. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for sensing an object within an imaging field of an image pickup device, the apparatus comprising:
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a memory for storing data of a reference background picture of the imaging field; means for inputting picture data from the image pickup device; means for comparing the inputted picture data with the stored reference background picture data to detect a difference value between the inputted picture data and the stored reference background picture data, and to detect a polarity of the difference value; a converter for converting the difference value into binarization data based on a difference threshold value which depends on the polarity of the difference value; a calculator for calculating a similarity between the inputted picture data and the stored reference background picture data; and a detector for sensing whether an object is within the imaging field based on the polarity of the difference value, the similarity, and a similarity threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field is distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field. - View Dependent Claims (25)
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26. A method of sensing an object within an imaging field of an image pickup device, the method comprising the steps of:
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storing data of a reference background picture of the imaging field; reading out picture data from the image pickup device; comparing the read-out picture data with the stored reference background picture data to detect a difference value between the read-out picture data and the stored reference background picture data, and to detect a polarity of the difference value; converting the difference value into binarization data based on a difference threshold value which depends on the polarity of the difference value; calculating a similarity between the read-out picture data and the stored reference background picture data; and sensing whether an object is within the imaging field based on the polarity of the difference value, the similarity, and a similarity threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field is distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of sensing an object within an imaging field of an image pickup device, the method comprising the steps of:
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storing data of a plurality of pixels of a reference background picture of the imaging field; reading out picture data of a plurality of pixels from the image pickup device; comparing the data of the pixels of the read-out picture data with the data of corresponding ones of the pixels of the stored reference background picture data to detect respective difference values between the data of the pixels of the read-out picture data and the data of the corresponding one of the pixels of the stored reference background picture data, and to detect respective polarities of the difference values; converting the difference values into respective binarization data based on a threshold value which depends on the respective polarities of the difference values; calculating respective similarities between the pixels of the read-out picture data and the corresponding one of the pixels of the stored reference background picture data; and sensing whether an object is within the imaging field based on the polarities of the difference values, the similarities, and a similarity threshold value which is changed in response to the polarities of the difference values so that an object within the imaging field is distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification