Importance

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Abstract

The present invention provides a technique of accurately extracting areas of characters included in a captured image even in a case where noise or dirt of a relatively large area occurs in a background image. A pixel value integration evaluation value is obtained by integrating pixel values in a character extracting direction B at each of the pixel positions in a character string direction A of an image including a character string. A waveform of the value is expressed as waveform data. A first threshold and a second threshold are set for the waveform data. An area in which the waveform data exceeds the first threshold is set as a character candidate area. In a case where an area in which the pixel value integration evaluation value exceeds the second threshold exists in the character candidate areas, the character candidate area is regarded as a true character area and the characters are extracted.

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First Claim