Image scanning apparatus, image processing apparatus, and non-transitory computer-readable recording medium

An image scanning apparatus comprising:

• a scanning unit configured to scan a document and generate original image data representing an original image;
• and
• a controller configured to:
• convert the original image data into first to Nth converted image data in this order, wherein N is an integer greater than 2,
• analyze the original image data and count a number of first characters recognized in the original image represented by the original image data,
• each time the controller converts the original image data into one of the first to Nth converted image data, analyze the one of the first to Nth converted image data and count a number of second characters recognized in a corresponding converted image,
• compare the number of first characters with the number of second characters and determine which one of the number of first characters and the number of second characters is greater than the other,
• output the one of the first to Nth converted image data when the controller determines that the number of second characters is greater than the number of first characters, and
• stop converting the original image data once the controller outputs the one of the first to Nth converted image data.

An image processing apparatus comprising:

• a controller configured to:
• obtain original image data representing an original image,
• convert the original image data into converted image data representing a converted image,
• analyze the original image data and count a number of first characters recognized in the original image represented by the original image data,
• analyze the converted image data and count a number of second characters recognized in the converted image represented by the converted image data,
• compare the number of first characters with the number of second characters and determine which one of the number of first characters and the number of second characters is greater than the other, and
• output the original image data when the controller determines that the number of first characters is greater than the number of second characters, and output the converted image data when the controller determines that the number of second characters is greater than the number of first characters;
• wherein the controller is configured to convert the original image data into the converted image data such that a ground color of the original image represented by the original image data is corrected to a predetermined ground color of the converted image represented by the converted image data.

A non-transitory computer-readable recording medium, for use in an image processing apparatus, storing computer readable instructions, the computer readable instructions, when executed by a processor, causing the image processing apparatus to perform:

• obtaining original image data representing an original image,
• converting the original image data into converted image data representing a converted image,
• analyzing the original image data and counting a number of first characters recognized in the original image represented by the original image data,
• analyzing the converted image data and counting a number of second characters recognized in the converted image represented by the converted image data,
• comparing the number of first characters with the number of second characters and determining which one of the number of first characters and the number of second characters is greater than the other, and
• outputing the original image data when the controller determines that the number of first characters is greater than the number of second characters, and outputing the converted image data when the controller determines that the number of second characters is greater than the number of first characters;
• wherein the original image data is converted into the converted image data such that a ground color of the original image represented by the original image data is corrected to a predetermined ground color of the converted image represented by the converted image data.