Image forming apparatus

An image forming apparatus comprising:

• an image reader which reads a document, and generates image data of the document;
• a controller
• which includes a circuit that performs image processing,
• which performs the image processing with respect to the image data of the document, and
• which generates output image data from the image data of the document;
• and
• an output section which externally outputs the output image data,
• wherein
• the output section is
• a communicator which transmits the output image data to an external device, or
• a printer which prints an image on a sheet based on the output image data,
• the image reader reads the document at a highest resolution of a predetermined plurality of levels of resolutions,
• the controller
• generates second image data having a resolution lower than the highest resolution from first image data, which is image data of the document obtained by reading of the document performed at the highest resolution,
• performs character recognition processing on both the first image data and the second image data,
• performs
• processing in which an average value of confidence factors of characters in a first recognition result, which is a recognition result of the character recognition processing performed on the first image data, is set as a first comparison value and an average value of confidence factors of characters in a second recognition result, which is a recognition result of the character recognition processing performed on the second image data is set as a second comparison value, or
• processing in which any of the characters recognized in the character recognition processing performed on the first image data is set as a target character, a confidence factor of the target character, among the confidence factors of the characters in the first recognition result, is set as the first comparison value, and a confidence factor of a character that is a same character and of a same font as the target character, among the confidence factors of the characters in the second recognition result, is set as the second comparison value, and
• sets the resolution of the output image data at a resolution one level higher than a resolution of the second image data when a value obtained by subtracting the second comparison value from the first comparison value is equal to or more than a predetermined threshold value.