Image compressing apparatus, image outputting apparatus, and image compressing method

An image compressing apparatus for compressing an image including a plurality of pixels to generate a compressed file, comprising:

• a compression ratio receiving section that receives selection of a compression ratio during a time of generation of the compressed file;
• a determining section that determines whether or not a predetermined number or more of pixels in correspondence to a black text are included in the image on a basis of a segmentation class signal indicative of which one of a plurality of segments including a text segment each pixel in the image belongs to when the compression ratio receiving section receives a high compression ratio;
• an extracting section that extracts a pixel constituting an edge of the black text from the image when the determining section determines that the predetermined number or more of pixels in correspondence to the black text are included;
• and
• a compressing section that compresses an image made of the pixel extracted by the extracting section.

An image compressing method for compressing an image including a plurality of pixels to generate a compressed file, comprising steps of;

• receiving selection of a compression ratio during a time of generation of the compressed file;
• determining whether or not a predetermined number or more of pixels in correspondence to a black text are included in the image on a basis of a segmentation class signal indicative of which one of a plurality of segments including a text segment each pixel in the image belongs to when a high compression ratio is received;
• extracting a pixel constituting an edge of the black text from the image when it is determined that the predetermined number or more of pixels in correspondence to the black text are included;
• and
• compressing an image made of the extracted pixel.

A non-transitory computer-readable recording medium in which a computer program for causing a computer to compress an image including a plurality of pixels to generate a compressed file is recorded, the computer program comprising steps of:

• causing the computer to determine whether or not a predetermined number or more of pixels in correspondence to a black text are included in the image on a basis of a segmentation class signal indicative of which one of a plurality of segments including a text segment each pixel in the image belongs to when selection of a specific compression ratio as a compression ratio during a time of generation of the compressed file is received;
• causing the computer to extract a pixel constituting an edge of the black text from the image when the computer determines that the predetermined number or more of pixels in correspondence to the black text are included;
• and
• causing the computer to compress an image made of the extracted pixel.