Image detection device and image detection method
First Claim
1. An image detection device detecting a specific image to be searched for from an image, the device comprising:
- a size changing means for changing a size of an original image according to a set scaling factor;
a detection means for detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing means;
means for determining an absent area where another specific image cannot exist on the basis of the detected specific image, when the specific image to be searched for is detected by the detection means,a change means for changing the scaling factor; and
a control means for performing control so as to make the processing by the size changing means and the processing by the detection means to be carried out again using the scaling factor changed by the change means,wherein the control means excludes a part corresponding to the absent area from an object to be detected by the detection means, when making the processing by the size changing means and the processing by the detection means to be carried out again using the changed scaling factor.
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Abstract
The present invention provides an image detection device and an image detection method for efficiently detecting a specific image area existing within an image. The image detection device of the present invention first changes a size of an original image using an initial value of a scaling factor (enlargement/reduction ratio) against the original image and detects the specific image (e.g. number plate). Next, the image detection device carries out the change of the original image size and the detection of the specific image repeatedly by changing the scaling factor. Further, an embodiment of the present invention realizes a high speed by repeating the detection while using the enlarged or reduced images, and also realizes the high speed by determining an area where another specific image cannot exist and carrying out the detection efficiently using this information.
15 Citations
33 Claims
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1. An image detection device detecting a specific image to be searched for from an image, the device comprising:
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a size changing means for changing a size of an original image according to a set scaling factor; a detection means for detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing means; means for determining an absent area where another specific image cannot exist on the basis of the detected specific image, when the specific image to be searched for is detected by the detection means, a change means for changing the scaling factor; and a control means for performing control so as to make the processing by the size changing means and the processing by the detection means to be carried out again using the scaling factor changed by the change means, wherein the control means excludes a part corresponding to the absent area from an object to be detected by the detection means, when making the processing by the size changing means and the processing by the detection means to be carried out again using the changed scaling factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image detection method detecting a specific image to be searched for from an image, the method comprising the steps of:
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changing a size of an original image according to a set scaling factor; detecting the specific image to be searched for from the image, the size of which has been changed by the size changing step; determining an absent area where another specific image cannot exist on the basis of the detected specific image, when the specific image to be searched for is detected in the detecting step, changing the scaling factor; and performing control so as to make the size changing step and the detecting step to be carried out again using the scaling factor changed by the changing step, wherein the step of performing control includes excluding a part corresponding to the absent area from an object to be detected in the detecting step, when making the processing in the size changing step and the processing in the detecting step to be carried out again using the changed scaling factor. - View Dependent Claims (14, 15)
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16. An image detection device detecting a specific image to be searched for from an image, the device comprising:
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a size changing means for changing a size of an original image according to a set scaling factor; a detection means for detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing means; means for determining a peripheral area of the detected specific image as an absent area where another specific image cannot exist; a change means for changing the scaling factor; and a control means for performing control so as to make the processing by the size changing means and the processing by the detection means to be carried out again using the scaling factor changed by the change means, wherein the control means excludes a part corresponding to the absent area from an object to be detected by the detection means, when making the processing by the size changing means and the processing by the detection means to be carried out again using the changed scaling factor. - View Dependent Claims (17, 18, 19, 20)
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21. An image detection method detecting a specific image to be searched for from an image, the method comprising the steps of:
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changing a size of an original image according to a set scaling factor; detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing step; determining a peripheral area of the detected specific image as an absent area where another specific image cannot exist; changing the scaling factor; and performing control so as to make the size changing step and the detection step to be carried out again using the scaling factor changed by the change step, wherein the step of performing control includes excluding a part corresponding to the absent area from an object to be detected by the detection step, when making the size changing step and the detection step to be carried out again using the changed scaling factor. - View Dependent Claims (22, 23, 24, 25)
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26. A non-transitory computer-readable storage medium, storing a computer program therein for causing a computer to execute an image detection method detecting a specific image to be searched for from an image, the method comprising the steps of:
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changing a size of an original image according to a set scaling factor; detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing step; determining a peripheral area of the detected specific image as an absent area where another specific image cannot exist; changing the scaling factor; and performing control so as to make the size changing step and the detection step to be carried out again using the scaling factor changed by the change step, wherein the step of performing control includes excluding a part corresponding to the absent area from an object to be detected by the detection step, when making the size changing step and the detection step to be carried out again using the changed scaling factor. - View Dependent Claims (27, 28, 29, 30)
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31. An image detection device detecting a specific image to be searched for from an image, the device comprising:
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a size changing means for changing a size of an original image according to a set scaling factor; a detection means for detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing means; a change means for changing the scaling factor; and a control means for performing control so as to make the processing by the size changing means and the processing by the detection means to be carried out again using the scaling factor changed by the change means, wherein the control means determines whether another specific image which is not the specific image having been detected by the detection means can exist or not within the original image, when determining that another specific image can exist, performs the control so as to make the processing by the size changing means and the processing by the detection means to be carried out again using the scaling factor changed by the change means, and when determining that another specific image can not exist, performs the control so as not to make the processing by the size changing means and the processing by the detection means to be carried out again.
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32. An image detection method detecting a specific image to be searched for from an image, the method comprising the steps of:
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changing a size of an original image according to a set scaling factor; detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing step; changing the scaling factor; and performing control so as to make the size changing step and the detecting step to be carried out again using the scaling factor changed by the change step, wherein the step of performing control includes determining whether another specific image which is not the specific image having been detected by the detection step can exist or not within the original image, when determining that another specific image can exist, includes performing the control so as to make the size changing step and the detecting step to be carried out again using the scaling factor changed in the changing step, and when determining that another specific image can not exist, includes performing the control so as not to make the size changing step and the detecting step to be carried out again.
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33. A non-transitory computer-readable storage medium, storing a computer program therein for causing a computer to execute an image detection method detecting a specific image to be searched for from an image, the method comprising the steps of:
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changing a size of an original image according to a set scaling factor; detecting the specific image to be searched for within a detectable size range of the image detection device from the image, the size of which has been changed by the size changing step; changing the scaling factor; and performing control so as to make the size changing step and the detecting step to be carried out again using the scaling factor changed by the change step, wherein the step of performing control determines whether another specific image which is not the specific image having been detected by the detection step can exist or not within the original image, when determining that another specific image can exist, performs the control so as to make the size changing step and the detecting step to be carried out again using the scaling factor changed in the changing step, and when determining that another specific image can not exist, performs the control so as not to make the size changing step and the detecting step to be carried out again.
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Specification