Patent ID: 8730544

Claim:
A decolorizing device comprising: a transferring section configured to transfer a sheet on which an image is formed by a decolorable colorant; a first reading section configured to read a first side of the sheet transferred by the transferring section; a decolorizing section placed on a downstream side of the first reading section in a sheet transferring direction and configured to perform a decolorizing process on the sheet; a second reading section placed on a downstream side of the decolorizing section in the sheet transferring direction and configured to read the first side of the sheet; and a controller configured to determine if the decolorizing process is necessary or not on the first side based on first image data of the first side read by the first reading section, to read the first side of the sheet having been subjected to the decolorizing process at the decolorizing section by the second reading section if it is determined that the decolorizing process is necessary, and to avoid reading of the first side of the sheet passed through the decolorizing section by the second reading section if it is determined that the decolorizing process is unnecessary.