Optical information reading method, optical information reading device, and storage medium
AssigneeOptoelectronics Co., Ltd.
InventorYasutake KAWASHIMA
Life of this patent
Estimating the term…
Abstract
In a case where an image is periodically captured and the optical information contained in the image is read by analyzing the image, an amount of movement of the imager within a certain time range is estimated based on images captured in the certain time range, and an imaging condition is adjusted by an imaging adjustment process based on pixel values of pixels in the captured images so that the brightness of images to be obtained in subsequent imaging reaches a predetermined target level. When reading of the optical information fails even though it can be determined that, based on the estimated amount of movement, aiming has been established, and the imaging adjustment process is performed again, the target level is changed to a higher level.
Claims25
An optical information reading method comprising:
- periodically capturing an image by an imager;
- analyzing the image captured by the imager to read optical information contained in the image;
- estimating, based on images captured within a first time range, an amount of movement of the imager in the first time range;
- adjusting an imaging condition of the imager based on pixel values of pixels in the image captured by the imager so that brightness of an image to be obtained in subsequent capturing reaches a predetermined target level;
- and
- adjusting the target level to a higher level when the reading of the optical information in the analyzing fails while the estimated amount of movement satisfies a predetermined first upper limit.
An optical information reading device comprising:
- an imager;
- an imaging controller configured to cause the imager to periodically capture an image;
- a reading part configured to analyze the image captured by the imager to read optical information contained in the image;
- an estimating part configured to estimate, based on images captured within a first time range, an amount of movement of the imager in the first time range;
- and
- a condition adjusting part configured to adjust an imaging condition of the imager based on pixel values of pixels in the image captured by the imager so that brightness of an image to be obtained in subsequent capturing reaches a predetermined target level;
- and
- a target level adjusting part configured to adjust the target level to a higher level when the reading of the optical information in the analyzing fails while the estimated amount of movement satisfies a predetermined first upper limit.
A non-transitory machine-readable storage medium containing program instructions executable by a computer, and when executed, causing one computer or a plurality of computers in cooperation to execute an optical information reading method, the method comprising:
- periodically capturing an image by an imager;
- analyzing the image captured by the imager to read optical information contained in the image;
- estimating, based on images captured within a first time range, an amount of movement of the imager in the first time range;
- adjusting an imaging condition of the imager based on pixel values of pixels in the image captured by the imager so as to achieve a predetermined target level of brightness of an image to be obtained in subsequent capturing;
- and
- adjusting the target level to a higher level when the reading of the optical information in the analyzing fails while the estimated amount of movement satisfies a predetermined first upper limit.
Dependencies are inferred from the claim text.