Reading system, reading device, reading method, and storage medium

A reading device, comprising:

• an imager acquiring an input image by imaging a segment display;
• an extractor extracting a candidate image from the input image, the candidate image being a candidate of a portion in which the segment display is imaged;
• a determiner using the candidate image and a mask to calculate a match ratio indicating a certainty of a segment display being included in the candidate image, and determining that the candidate image is an image of a segment display when the match ratio is not less than a threshold, the mask and the threshold being preset;
• and
• a reader reading a character displayed in a segment display from the candidate image determined to be an image of a segment display, wherein
• the extractor extracts a contour from the input image,
• the extractor calculates a surface area of a region surrounded with the contour,
• the extractor extracts, based on the contour, an image having a prescribed shape from the input image when the surface area is not less than a threshold, the threshold being preset, and
• the extractor outputs, as the candidate image, the extracted image satisfying a condition, the condition being preset.

A reading method, comprising:

• extracting a candidate image from an input image, the candidate image being a candidate of a portion in which a segment display is imaged;
• using the candidate image and a mask to calculate a match ratio indicating a certainty of a segment display being included in the candidate image, and determining that the candidate image is an image of a segment display when the match ratio is not less than a threshold, the mask and the threshold being preset;
• and
• reading a numerical value displayed in a segment display from the candidate image determined to be an image of a segment display, wherein
• the extracting extracts a contour from the input image,
• the extracting calculates a surface area of a region surrounded with the contour,
• the extracting extracts, based on the contour, an image having a prescribed shape from the input image when the surface area is not less than a threshold, the threshold being preset, and
• the extracting outputs, as the candidate image, the extracted image satisfying a condition, the condition being preset.

A non-transitory computer-readable storage medium storing a computer executable program,

• the program causing a computer to:
• extract a candidate image from an input image, the candidate image being a candidate of a portion in which a segment display is imaged;
• use the candidate image and a mask to calculate a match ratio indicating a certainty of a segment display being included in the candidate image, and determining that the candidate image is an image of a segment display when the match ratio is not less than a threshold, the mask and the threshold being preset;
• and
• read a numerical value displayed in a segment display from the candidate image determined to be an image of a segment display, wherein
• the to extract extracts a contour from the input image,
• the to extract calculates a surface area of a region surrounded with the contour,
• the to extract extracts, based on the contour, an image having a prescribed shape from the input image when the surface area is not less than a threshold, the threshold being preset, and
• the to extract outputs, as the candidate image, the extracted image satisfying a condition, the condition being preset.