Number recognition device, and recognition method therefor
First Claim
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1. A number recognition device comprising:
- a imaging means for taking an image containing a number plate of a motor vehicle;
an image processing means for ternarizing the taken image by a comparison using threshold values and circumjacent image elements in the image; and
a threshold value predicting means for computing optimum predicted values of the threshold values based on a brightness average and a brightness variance of the taken image, whereinthe image processing means executes a ternarization process by using the predicted values of the threshold values.
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Abstract
A number recognition device 1 includes a camera 2 for taking an image containing a number plate of a motor vehicle, and a ternarization processing part 32 for ternarizing the taken image by comparing it to circumjacent image elements and threshold values. Optimum predicted values are computed based on a brightness average and a brightness variance of the taken image, and a ternarization processing part 32 executes a ternarization process by using the predicted values of the threshold values.
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Citations
14 Claims
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1. A number recognition device comprising:
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a imaging means for taking an image containing a number plate of a motor vehicle; an image processing means for ternarizing the taken image by a comparison using threshold values and circumjacent image elements in the image; and a threshold value predicting means for computing optimum predicted values of the threshold values based on a brightness average and a brightness variance of the taken image, wherein the image processing means executes a ternarization process by using the predicted values of the threshold values. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. A number recognition method comprising the steps of:
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converting an color image taken with an imaging means into a monochrome image with a multiple gray scale brightness; computing a brightness average and a brightness variance of the image; comparing an image element of the taken image to circumjacent image elements thereof by using the brightness average and the brightness variance; predicting threshold values for a ternarization process which is used for classification of the image element into white, black and anchromatic color by a comparing to the threshold values; and executing a ternarization process by using the predicted threshold values to recognize a number plate based on data on the ternarized image. - View Dependent Claims (7, 8, 9, 10, 13, 14)
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Specification