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    • 63. 发明授权
    • Adaptive motion vector decision method and device for digital image
stabilizer system
    • 数字图像稳定系统的自适应运动矢量决策方法及装置
    • US5748231A
    • 1998-05-05
    • US72785
    • 1993-06-07
    • Yong-Chul ParkJoon-Ki PaikDong-Wook Kim
    • Yong-Chul ParkJoon-Ki PaikDong-Wook Kim
    • H04N5/14H04N5/232H04N5/228
    • H04N5/23261H04N5/145H04N5/23248H04N5/23254H04N5/23267
    • A digital image stabilization device receives correlation data generated from a plurality of local motion estimation areas and adaptively decides a motion vector according to irregular image environment. To do this, statistical variables and local motion vector are generated to check reliability by checking correlation values generated from each local motion estimation area. Then, it is determined that there is irregular image data deteriorating reliability of local motion vector, by analyzing statistical variables. Here, the irregular image environment can be in an image signal with low contrast, an image signal with a moving object, an image signal with repeated motion, etc. Also, isolativity and stability are obtained by analyzing local motion vector and a weight signal is generated with a predefined rate according to a computed result. Then, the output of the weight signal is controlled, according to a result of the reliability determination signal, where if there is irregular image data, the output of weight signal is blocked. And, a field motion vector is generated by multiplying a weight signal by a corresponding local motion vector and then averaging them. Finally, an accumulated motion vector is generated by attenuating a previous accumulated motion vector and adding the attenuated previous accumulated motion vector into the field motion vector.
    • 数字图像稳定装置接收从多个局部运动估计区域生成的相关数据,并根据不规则图像环境自适应地决定运动矢量。 为此,生成统计变量和局部运动矢量,通过检查从每个局部运动估计区域生成的相关值来检查可靠性。 然后,通过分析统计变量,确定存在不规则图像数据恶化局部运动矢量的可靠性。 这里,不规则图像环境可以是具有低对比度的图像信号,具有移动对象的图像信号,具有重复运动的图像信号等。此外,通过分析局部运动矢量获得隔离度和稳定性,并且权重信号是 根据计算结果以预定义的速率生成。 然后,根据可靠性判定信号的结果,控制加权信号的输出,如果存在不规则的图像数据,则加权信号的输出被阻止。 并且,通过将权重信号乘以相应的局部运动矢量然后对它们进行平均来产生场运动矢量。 最后,通过衰减先前累积的运动矢量并将衰减的先前累积运动矢量加到场运动矢量中来产生累积的运动矢量。