Image reading apparatus and image forming apparatus, comprising at least a mode reception and a selection of at least a quality first mode or a speed first mode

An image reading apparatus comprising:

• a document table on which a source document is to be placed;
• an image reading unit that reads the source document placed on the document table in a predetermined resolution and acquires an image;
• a first resolution conversion unit that converts the resolution of the image acquired by the image reading unit into a first resolution for inclination detection lower than the predetermined resolution;
• an inclination detection unit that detects the inclination of an image of the source document contained in the image subjected to the resolution conversion by the first resolution conversion unit;
• an inclination correction unit that corrects the inclination of the image according to the inclination detected by the inclination detection unit;
• a document image clipping unit that clips out the image of the source document from the image;
• a second resolution conversion unit that converts the resolution of the image into a second resolution for generating a read image lower than the predetermined resolution and higher than the first resolution;
• and
• a mode setting unit that sets a quality-first mode or a speed-first mode,
• wherein, when the mode setting unit sets the quality-first mode, the document image clipping unit clips out, after the inclination correction unit corrects the inclination of the image acquired by the image reading unit in the predetermined resolution, according to the inclination detected by the inclination detection unit, the image of the source document from the image subjected to the inclination correction, and the second resolution conversion unit converts the resolution of the image of the source document into the second resolution, and
• when the mode setting unit sets the speed-first mode, the second resolution conversion unit converts, after the document image clipping unit clips out the image of the source document from the image acquired by the image reading unit in the predetermined resolution, the resolution of the image of the source document that has been clipped out into the second resolution, and the inclination correction unit corrects the inclination of the image of the source document subjected to the resolution conversion into the second resolution, according to the inclination detected by the inclination detection unit.