Image reading apparatus, black correction executing method, and a computer-readable medium storing black correction executing program

A computer-readable medium storing a program causing a computer to execute a process to perform a black correction to correct an electrical signal in an image reading apparatus that includes, a photoelectric sensor having a plurality of reading pixels aligned in one direction with respect to a document that each output an electrical signal depending on an amount of light from an image on the document, the photoelectric sensor reading the image in accordance with a read instruction, the process comprising:

• determining whether to perform the black correction, when a read interval between each two consecutive sheets of the document is less than a predetermined period of time;
• and
• performing the black correction, in accordance with a result of the determination, to adjust an output under dark condition of each of the reading pixels of the photoelectric sensor to a value falling within a predetermined range, the output under dark condition being an electrical signal output obtained when an amount of light input to the corresponding reading pixel is zero.

A method for performing a black correction to correct an electrical signal in an image reading apparatus that includes a photoelectric sensor having a plurality of reading pixels aligned in one direction with respect to a document that each output the electrical signal depending on an amount of light from an image on the document, the photoelectric sensor reading the image in accordance with a read instruction, the method comprising:

• determining whether to perform the black correction, when a read interval between each two consecutive sheets of the document is shorter than a predetermined period of time;
• and
• performing the black correction, in accordance with a result of the determination, to adjust an output under dark condition of each of the reading pixels of the photoelectric sensor to a value falling within a predetermined range, the output under dark condition being an electrical signal output obtained when an amount of light input to the corresponding reading pixel is zero.