IMAGE DATA STORING DEVICE

摘要

PURPOSE:To prevent the operation of this image data storing device from being unstabilized caused by increasing coding data volume (buffer residual) leaving in a buffer included in a coding data I/O means. CONSTITUTION:A bus congestion predicting means 20 predicts the congestion of a data bus 10 and applies the predicted result to a coding volume control means 21 to reflect the predicted result to the determination of quantilizing step width qp (m) formed by the means 21. Thereby a quantizing means 4 accurately executes the quantization of orthogonal transformation data F(u,v) based upon the width qp (m). At the time of predicting extreme congestion as a congestion predicting result, the means 20 informs coding disableness to the host side through a data bus 10. Consequently the image data storing device can be driven under an optimum condition.