Patent ID: 7813571
Filing Date: 2010-10-12
Classification: H04N

Abstract:
1. An image encoding apparatus comprising: a converter receiving an image signal, and carrying out orthogonal transformation on a block by block basis of an image frame to convert the image signal of individual block to DC components and AC components; a predicted reference value generator receiving the image signal, and generating a predicted reference value of each image frame from DC components obtained by orthogonal transformation of only left-edge blocks of the image frame; a differential unit obtaining values between the DC components output from said converter and the predicted reference value generated by said predicted reference value generator, wherein said image encoding apparatus carries out quantizing and variable-length encoding of the AC components and the difference values obtained by said differential unit, carries out quantizing and variable-length encoding of the predicted reference value to be added to a header, and outputs the encoded AC components and difference values along with the encoded predicted reference value added to the header as a bit stream.