DETECTION DEVICE
A detection device includes a planar detection device includes a plurality of photodetection elements arranged in a planar configuration, a light source device disposed so as to face the planar detection device, and a light-transmitting mounting substrate on which a plurality of objects to be detected are mounted, the light-transmitting mounting substrate being disposed between the planar detection device and the light source device.
1 . A detection device comprising:
a planar detection device comprising a plurality of photodetection elements arranged in a planar configuration;
a light source device disposed so as to face the planar detection device; and
a light-transmitting mounting substrate on which a plurality of objects to be detected are mounted, the light-transmitting mounting substrate being disposed between the planar detection device and the light source device, wherein
the planar detection device comprises:
a detection area in which a plurality of sensor pixels comprising the photodetection elements are arranged in a first direction and a second direction orthogonal to the first direction;
a detection circuit configured to acquire a sensor value of each of the sensor pixels; and
a control circuit configured to generate an image in the detection area by applying a filter according to a received light intensity to a value calculated based on the sensor value of each of the sensor pixels.
2 . The detection device according to claim 1 , wherein the control circuit is configured to multiply the sensor value for each of the sensor pixels by a correction coefficient according to the received light intensity of the sensor pixel such that a corrected value for each of the sensor pixels is calculated, and apply the filter according to the received light intensity to the corrected value such that the image in the detection area is generated.
3 . The detection device according to claim 2 , wherein the control circuit is configured to generate the image in the detection area by subtracting a reference value for each of the sensor pixels from the value after the application of the filter.
4 . The detection device according to claim 1 , wherein the filter is a low-pass filter in which a cutoff frequency according to the received light intensity is set for each of the sensor pixels.
5 . The detection device according to claim 4 , wherein the cutoff frequency of the filter is higher for the sensor pixel that receives a higher light intensity and lower for the sensor pixel that receives a lower light intensity.
6 . The detection device according to claim 5 , wherein
the control circuit comprises:
a first process to set a correction coefficient, the cutoff frequency, and a reference value for each of the sensor pixels; and
a second process to generate the image in the detection area.
7 . The detection device according to claim 6 , wherein the control circuit is configured to set the correction coefficient to a reciprocal of the sensor value of each of the sensor pixels acquired in the first process.
8 . The detection device according to claim 6 , wherein the control circuit is configured to calculate the reference value by multiplying the sensor value of each of the sensor pixels acquired in the first process by the correction coefficient for each of the sensor pixels.
9 . The detection device according to claim 6 , wherein the control circuit is configured to normalize the sensor value of each of the sensor pixels acquired in the first process to calculate the received light intensity of the sensor pixels.