Document reading apparatus, document reading method and storage medium

Provided is a document reading apparatus for identifying irregular shadow generated when reading document and for correcting the identified irregular shadow. Lights are irradiated toward the reading areas of the document from a plurality of directions with different light amount. Through the photoelectric conversion of the reflected light, the first image data of a target pixel and the second image data of the target pixel are obtained. Then, through the determination of the type of the document of the target pixel based on the first data and the second data of the target pixel and through the verification (re-determination of the document type) based on the type of the document of peripheral pixel adjacent to the target pixel, irregular shadow is accurately identified.