Biological information detecting device
First Claim
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1. A biological information detecting device, comprising:
- a sensor configured to sample biological information;
a biological information region extraction unit configured to calculate statistical quantities, based on a value of pixel distribution of an image sampled by the sensor, and to extract a region containing biological information, based on the statistical quantities; and
a partial sensitivity fluctuation correction unit configured to correct partial sensitivity fluctuations by homogenizing the value of pixel levels of a background in each partial region of the sampled image, whereinpartial sensitivity fluctuations for each partial region are corrected by homogenizing the value of pixel levels of the background after homogenizing a mean value and standard deviation of the respective partial region when the standard deviation value of the respective partial region is not smaller than a standard deviation value of a total image whose sensitivity variations of each background image has been corrected, and, if the standard deviation value of the respective partial region is smaller than a standard deviation value of the total image whose sensitivity variations of each background image has been corrected, the partial sensitivity fluctuations for the respective partial region are not corrected by homogenizing standard deviation values for the respective partial region.
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Abstract
When an image representing biological information is input from a biological information input unit 10, such as a fingerprint sensor or the like, for obtaining an image representing biological information, such as a fingerprint or the like, statistical quantities, such as the mean value and standard deviation of the pixel values of the sampled image, are calculated. Then, using the statistical quantities, a region containing biological information is extracted, its sensitivity variations are eliminated and the effects of stains, such as a residual fingerprint is nullified, thereby generating a favorable biological image with high contrast.
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Citations
11 Claims
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1. A biological information detecting device, comprising:
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a sensor configured to sample biological information; a biological information region extraction unit configured to calculate statistical quantities, based on a value of pixel distribution of an image sampled by the sensor, and to extract a region containing biological information, based on the statistical quantities; and a partial sensitivity fluctuation correction unit configured to correct partial sensitivity fluctuations by homogenizing the value of pixel levels of a background in each partial region of the sampled image, wherein partial sensitivity fluctuations for each partial region are corrected by homogenizing the value of pixel levels of the background after homogenizing a mean value and standard deviation of the respective partial region when the standard deviation value of the respective partial region is not smaller than a standard deviation value of a total image whose sensitivity variations of each background image has been corrected, and, if the standard deviation value of the respective partial region is smaller than a standard deviation value of the total image whose sensitivity variations of each background image has been corrected, the partial sensitivity fluctuations for the respective partial region are not corrected by homogenizing standard deviation values for the respective partial region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for executing a biological information detecting method by a biological information detecting device, the method comprising:
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sampling biological information; calculating statistical quantities, based on a value of pixel distribution of an image sampled in the sampling, and extracting a region containing the biological information, based on the statistical quantities; and correcting partial sensitivity fluctuations by homogenizing the value of pixel levels of a background in each partial region of the sampled image, wherein partial sensitivity fluctuations for each partial region are corrected by homogenizing the value of pixel levels of the background after homogenizing a mean value and standard deviation of the respective partial region when the standard deviation value of the respective partial region is not smaller than a standard deviation value of a total image whose sensitivity variations of each background image has been corrected, and, if the standard deviation value of the respective partial region is smaller than a standard deviation value of the total image whose sensitivity variations of each background image has been corrected, the partial sensitivity fluctuations for the respective partial region are not corrected by homogenizing standard deviation values for the respective partial region.
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Specification