An image processing device includes a writing circuit to write image data to an image memory and detect a write line number, a coordinate generating circuit to generate coordinate information based on inclination information, detect a minimum sub-scanning coordinate in each of divided areas of the image data, and generate first read addresses for reading the divided areas from the image memory, a reading circuit to read the divided areas from the image memory and detect a read line number, a reading control circuit to bring the reading circuit into a standby state and cancel the standby state, and a memory control circuit to generate write addresses for writing the divided areas to a memory, sequentially write the read divided areas to the memory, generate second read addresses for reading the divided areas from the memory, and sequentially read the divided areas from the memory.

An image processing device includes a writing circuit to write image data to an image memory and detect a write line number, a coordinate generating circuit to generate coordinate information based on inclination information, detect a minimum sub-scanning coordinate in each of divided areas of the image data, and generate first read addresses for reading the divided areas from the image memory, a reading circuit to read the divided areas from the image memory and detect a read line number, a reading control circuit to bring the reading circuit into a standby state and cancel the standby state, and a memory control circuit to generate write addresses for writing the divided areas to a memory, sequentially write the read divided areas to the memory, generate second read addresses for reading the divided areas from the memory, and sequentially read the divided areas from the memory.