IMAGE PROCESSING APPARATUS , IMAGE PROCESSING METHOD, AND SUPPLYING MEDIUM

摘要

A converter partially removes frames of a sequentially scanning image data input to the converter. The resultant data is output to a preprocessing circuit. As a result, the sequentially scanning image data with a frame rate of 60 frames/sec is converted to image data with a frame rate of 30 frames/sec. A prediction error generator 102 calculates prediction error data and outputs the result to a DCT circuit. The DCT circuit performs DCT processing on the prediction error data supplied from the prediction error generator thereby producing DCT coefficients. The obtained DCT coefficients are supplied to a quantizer. The quantizer quantizes the DCT coefficients supplied from the DCT circuit thereby producing quantized data. The quantized data output from the quantizer is supplied to a variable length encoder and a dequantizer. The variable length encoder performs variable length encoding upon the quantized data supplied from the quantizer thereby producing coded image data, The resultant coded image data is output via a buffer. Thus, the given image data to be transmitted is first converted such that the frame rate becomes one-half the original frame rate, and then the image data is encoded.