Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
244 words
A pattern recognition apparatus for detecting a coincidence between an input image pattern and a target pattern, said apparatus comprising: means for receiving input image data f ij , wherein f ij denotes a concentration of the input image pattern at a picture element i,j on a two-dimensional plane of the input image pattern; means for storing mask data g uv , wherein g uv denotes a concentration of the target pattern at a point u,v on a two-dimensional plane of the target pattern; means for scanning the mask data g uv with respect to the input image data f ij and for computing a proportional coefficient corresponding to each picture element i,j on the two-dimensional plane of the input image pattern, wherein the proportional coefficient denotes a ratio between the concentration of the input image data f ij and the concentration of the mask data g uv ; means for dividing the input image data f ij into a plurality of partial templates each denoting a two-dimensional subsection of the input image pattern; means for calculating for each partial template a proportional evaluation index σ ij corresponding to each picture element i,j of the two-dimensional plane of the input image pattern, the proportional evaluation index σ ij denoting a degree of dispersion of the proportional coefficients within each partial template; and, means for detecting, as a candidate partial template, a partial template having a proportional evaluation index σ ij of a minimum value.
Claim 2
Dependent Claim
244 words
A pattern recognition apparatus for detecting a coincidence between an input image pattern and a target pattern, said apparatus comprising: means for receiving input image data f ij , wherein f ij denotes a concentration of the input image pattern at a picture element i,j on a two-dimensional plane of the input image pattern; means for storing mask data g uv , wherein g uv denotes a concentration of the target pattern at a point u,v on a two-dimensional plane of the target pattern; means for scanning the mask data g uv with respect to the input image data f ij and for computing a proportional coefficient corresponding to each picture element i,j on the two-dimensional plane of the input image pattern, wherein the proportional coefficient denotes a ratio between the concentration of the input image data f ij and the concentration of the mask data g uv ; means for dividing the input image data f ij into a plurality of partial templates each denoting a two-dimensional subsection of the input image pattern; means for calculating for each partial template a proportional evaluation index σ ij corresponding to each picture element i,j of the two-dimensional plane of the input image pattern, the proportional evaluation index σ ij denoting a degree of dispersion of the proportional coefficients within each partial template; and, means for detecting, as a candidate partial template, a partial template having a proportional evaluation index σ ij of a minimum value.
Claim 3
Dependent Claim
33 words
An apparatus as recited in claim 1, further comprising means for calculating the proportional evaluation index σ ij by applying the sum of squares method to the proportional coefficients for each partial template.
Claim 4
Dependent Claim
51 words
An apparatus as recited in claim 1, further comprising means for calculating and storing inverse mask data g' uv , wherein g' uv =1/g uv , and means for obtaining the product of the input image data f ij and the inverse mask data g' uv to obtain the proportional coefficients.
Claim 5
Dependent Claim
51 words
An apparatus as recited in claim 1, further comprising means for successively inspecting the value of each proportional evaluation index σ ij and for determining that a corresponding partial template coincides with the mask data when the value of a proportional evaluation index σ ij is less than a specified value.
Claim 6
Dependent Claim
48 words
An apparatus as recited in claim 1, further comprising means for detecting a saturation of the concentration of the input image data f ij , and for correspondingly adjusting at least one of an illumination level, a camera sensitivity, and a camera focusing of an image input device.