Imaging system with image processing for re-writing a portion of a pixel

Abstract

An image sensing apparatus which performs fast data processing without suffering an increased manufacturing cost. The image sensing apparatus senses an object and produces an image data signal screen-by-screen. In one embodiment, an image sensing apparatus for producing an image data signal includes an image sensing unit, a signal processor, a main buffer memory, and an image data processing circuit. A first group of processed pixels having the size of a first matrix is stored in the main buffer memory. The image data processing circuit receives a second group of pixels having the size of a second matrix from the first group stored in the main buffer memory. Included in image data processing circuit is a sub buffer which is initially filled with the second group of pixels. As pixels are processed and removed from the sub buffer, a third group of pixels is provided from the main buffer which is equal in size to a horizontal row or a vertical column from the second group.