Image reading apparatus, image reading method and a program for measuring black and white reference data

Abstract

A carriage motor which is a heat generating device is arranged next to a CIS in a scanner unit. The carriage motor drives respective transport rollers of an ADF unit via a gear system as well. The scanner unit makes a white reference board be read so as to obtain white reference data, and obtains black reference data more frequently than the white reference data, e.g., in a continuous process for reading a document. As a CIS module continues a reading process, the black reference data changes as being affected by a change in temperature in the CIS module, etc. The scanner unit deals with such a change in the black reference data by obtaining the black reference data more frequently.

1 . An image reading apparatus comprising:
 a transporter configured to transport a document;   a reader configured to read the transported document in a transport reading region;   a white reference material arranged at a position to be read by the reading section; and   a controller configured to control the transport section and the reading section so as to obtain white reference data by making the reading section read the white reference material and to obtain black reference data,   wherein,
 the controller obtains the white reference data when the age reading apparatus returns from low power mode, and 
 the controller does not obtain the white reference data when the image reading apparatus has been a normal power mode. 
   
     
     
         2 . The image reading apparatus according to  claim 1 , wherein the reading section adjoins a movable section which moves while generating heat when the reading section reads the document. 
     
     
         3 . The image reading apparatus according to  claim 1 , wherein the control section obtains the black reference data in the transport reading region where the transported document is read. 
     
     
         4 . The image reading apparatus according to  claim 1 , wherein the white reference material is arranged opposite the transport reading region over a static reading region in which a document being put still is read, and
 the control section obtains the black reference data in the transport reading region.   
     
     
         5 . The image reading apparatus according to  claim 1 , wherein the control section obtains the black reference data more frequently by obtaining the black reference data upon a specific period of continuous reading time passing in a process for reading the document. 
     
     
         6 . The image reading apparatus according to  claim 1 , wherein the control section controls the transport section and the reading section upon specific low power performance conditions being satisfied, in relevant low power conditions, and obtains the white reference data and the black reference data when returning from the low power conditions. 
     
     
         7 . The image reading apparatus according to  claim 1 , wherein the controller obtains the black reference data the second case. 
     
     
         8 . The image reading apparatus according to  claim 7 , wherein the controller does not obtain the white reference data and the black reference when the image reading apparatus repeatedly reads the transported documents. 
     
     
         9 . A method for producing an image using an image reading apparatus, the method comprising:
 transporting a document with a transporter;   reading the transported document in a transport reading region with a reader;   providing white reference material arranged at a position to be read by the reading section;   controlling the transport section and the reading section with a controller so as to obtain white reference data by making the reading section read the white reference material and to obtain black reference data;   obtaining the white reference data when the image reading apparatus returns from low power mode, and not obtaining the white reference data when the image reading apparatus has been a normal power mode;   producing an image from the read transport document.