Image processing apparatus

An image processing apparatus, comprising:

• a line buffer;
• an input circuit configured to write image data into the line buffer;
• and
• an output circuit configured to read pixel data of a pixel to be sampled among the pixel data, the pixel specified correspondingly to a shrinking ratio;
• wherein with a throughput obtained by multiplying a throughput of the output circuit by a square of an inverse number of the shrinking ratio, the input circuit skips another pixel than the pixel to be sampled among the pixel data of an input block of a predetermined size that extends over lines of an inverse number of the shrinking ratio, and writes pixel data of the pixel to be sampled into the line buffer;
• and upon writing pixel data of an adjacent input block of the input block in a secondary scanning direction into the line buffer, the output circuit reads from the line buffer the pixel data of the pixel to be sampled and continuously outputs the pixel data.