Image dithering apparatus and method having a random dithering mechanism

An image dithering apparatus having a random dithering mechanism comprising:

• a storage circuit configured to store a plurality of parameter look-up tables and a plurality of dithering matrices;
• and
• a processing circuit electrically coupled to the storage circuit to access the storage circuit, and configured to execute an image dithering method comprising:
• receiving an input image having a plurality of pixels, wherein the plurality of pixels are categorized into a plurality of pixel blocks each having a size that is the same as a size of each of the plurality of dithering matrices;
• setting each of the plurality of pixel blocks as a pending block to perform steps of:
• (A) retrieving a selected parameter look-up table from the plurality of parameter look-up tables;
• (B) generating a space reference parameter of the under-calculation block in the input image and/or generating a time reference parameter according to a time parameter of the input image in an image stream;
• (C) looking up a matrix number from the selected parameter look-up table according to the space reference parameter and/or the time reference parameter;
• (D) retrieving a selected dithering matrix from the plurality of dithering matrices according to the matrix number;
• and
• (E) superimposing the selected dithering matrix and the pending block to generate a dithered block;
• and
• outputting a plurality of dithered blocks corresponding to the pixel blocks generated according to steps (A)-(E) as a dithered image.