VIDEO SIGNAL BIT AMOUNT CONTROL USING ADAPTIVE QUANTIZATION

In an apparatus for controlling the bit amount of each video object plane (VOP) of a moving picture, the quantization step size for each VOP is determined based on significance, complexity and color sensitivity of each VOP, so that human visual sensitivity is taken into consideration. Picture quality of a specific VOP is input via an input unit. Visual sensitivity class is classified based on the complexity and color sensitivity of the VOP. Histogram is calculated based on the variance of video signal of the VOP and visual sensitivity values for each VOP. Then, the quantization step size for the VOP is adjusted based on the histogram and a bit model while total bit amount of a frame is maintained.