Multifeed detection device and multifeed detection method
AssigneeGlory Ltd.
InventorsToshihiko Banjoya, Ryo Ikemoto
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Abstract
A multifeed detection device according to the present disclosure includes: a light source configured to irradiate a sheet with light; a light receiver configured to receive transmission light transmitted through a sheet and reflection light reflected by a sheet; and a controller configured to acquire, from the light receiver, transmission output data that is output data of the transmission light and reflection output data that is output data of the reflection light, the controller being configured to determine whether or not a multifeed of sheets has occurred based on the transmission output data and the reflection output data.
Claims5
A multifeed detection device, comprising;
- a light source to irradiate a sheet with light;
- a light receiver including a plurality of light receiving pixels configured to receive transmission light transmitted through a sheet and reflection light reflected by a sheet;
- and
- a controller configured to
- acquire, from the light receiver, transmission image data that is output data of the transmission light and includes output data from the plurality of light receiving pixels, and reflection image data that is output data of the reflection light and includes output data from the plurality of light receiving pixels;
- determine a result indicating whether or not a multifeed has occurred for each unit pixel based on the transmission image data, the reflection image data and a recognition function;
- and
- determine whether or not a multifeed of sheets has occurred based on the result, the recognition function is based on a machine-learned function generated using:
- one-sheet data based on transmission image data and reflection image data of one fit sheet of a certain type, and
- two-sheet data based on transmission image data and reflection image data of two fit sheets of the certain type, and
- the recognition function passes through a position corresponding to μ+k×σ, where μ is an average of an output value distribution obtained by inputting the two-sheet data into the machine-learned function, σ is a standard deviation of the output value distribution, and k is a coefficient in which 1≤k≤3.
A multifeed detection method, comprising:
- acquiring transmission image data from a light receiver including a plurality of light receiving pixels which receive transmission light emitted from a light source and transmitted through a sheet, the transmission image data being output data of the transmission light and includes output data from the plurality of light receiving pixels,
- acquiring reflection image data from the light receiver having received reflection light emitted from the light source and reflected by a sheet, the reflection image data being output data of the reflection light and includes output data from the plurality of light receiving pixels;
- determining a result indicating whether or not a multifeed has occurred for each unit pixel based on the transmission image data, the reflection image data and a recognition function;
- and
- determining whether or not a multifeed of sheets has occurred based on the result, wherein
- the recognition function is based on a machine-learned function generated using:
- one-sheet data based on transmission image data and reflection image data of one fit sheet of a certain type, and
- two-sheet data based on transmission image data and reflection image data of two fit sheets of the certain type, and
- the recognition function passes through a position corresponding to μ+k×σ, where μ is an average of an output value distribution obtained by inputting the two-sheet data into the machine-learned function, σ is a standard deviation of the output value distribution, and k is a coefficient in which 1≤k≤3.
Dependencies are inferred from the claim text.