Abstract: The present invention provides a quantization control system for video coding, for optimizing bit allocation based on visual priority which expresses at high precision human visual characteristics for videos, thereby improving subjective image quality of the whole image even with a limited number of bits. An object is extracted from a picture of an input image (S1) and a gaze parameter V(j) for the extracted object is calculated (S2). Then, a texture attribute parameter t(k) of each macroblock included in the object is calculated (S3). The gaze parameter V(j) and texture attribute parameter t(k) are used to calculate a visual priority parameter w(k) for each macroblock. Based on this parameter w(k), a quantization parameter is determined.

Abstract: The present invention provides a quantization control system for video coding, for optimizing bit allocation based on visual priority which expresses at high precision human visual characteristics for videos, thereby improving subjective image quality of the whole image even with a limited number of bits.

Abstract: When a digital signal processor (i.e., DSP) performs a data processing on data stored in a memory (e.g., RAM) in accordance with instructions given from a CPU, data read/write controls are carried out with respect to the data transmitted between the DSP and memory. In accordance with built-in micro-programs, the DSP produces plural musical tone signals in time-division manner. When employing 32-bit data to be processed in the DSP, this 32-bit data is divided into four sets of 8-bit data, which are sequentially written in the memory, for example. Thereafter, the DSP reads such four sets of 8-bit data from the memory, and then, the DSP converts them into the 32-bit data, so that the DSP can perform the predetermined data processing on the converted 32-bit data. Thus, the DSP, employing M-bit data to be processed therein, can be freely coupled with the memory which stores N-bit data (where M.gtoreq.N), as long as "M" is equal to or a multiple of "N".