A novel high spectrum efficiency channel encoding method called overlapped code division multiplexing （OvCDM） is presented. It is a convolutional encoding method with code rate greater than 1. Compared with traditio...A novel high spectrum efficiency channel encoding method called overlapped code division multiplexing （OvCDM） is presented. It is a convolutional encoding method with code rate greater than 1. Compared with traditional coded modulation （CM） technologies, OvCDM emphasizes the constrain relation between encoded codes. It is actually a blind modulation. The simulation results in the additive white Gaussian noise （AWGN） channel indicate that OvCDM can significantly improve spectrum efficiency of mobile communications systems. Meanwhile, the proposed OvCDM can ensure high decoding performance.展开更多
In the context of object oriented video coding, the encoding of segmentation maps defined by contour networks is particularly critical. In this paper, we present a lossy contour network encoding algorithm where both t...In the context of object oriented video coding, the encoding of segmentation maps defined by contour networks is particularly critical. In this paper, we present a lossy contour network encoding algorithm where both the rate distortion contour encoding based on maximum operator and the prediction error for the current frame based on quadratic motion model are combined into a optimal polygon contour network compression scheme. The bit rate for the contour network can be further reduced by about 20% in comparison with that in the optimal polygonal boundary encoding scheme using maximum operator in the rate distortion sense.展开更多
图像遥测系统是红外制导武器研制过程中必不可少的手段,但是由于导引头图像运动剧烈、携带信息量大,因此,适用于普通场景的码率控制算法难以直接应用于导引头图像遥测系统当中。对JM19.0使用的JVT-G012r1码率控制算法进行了分析,并根据...图像遥测系统是红外制导武器研制过程中必不可少的手段,但是由于导引头图像运动剧烈、携带信息量大,因此,适用于普通场景的码率控制算法难以直接应用于导引头图像遥测系统当中。对JM19.0使用的JVT-G012r1码率控制算法进行了分析,并根据导引头图像的特点提出一种结合感兴趣区域(Region of Interest,ROI)编码的码率控制算法,有效地对可用比特进行分配。同时以JM19.0软件为基础,对提出算法进行了仿真验证。仿真结果表明,与JVT-G012r1算法相比,该算法可以更好地适应导引头遥测图像的特点,提高感兴趣区域的图像质量,方便科研人员进一步分析研究。展开更多
基金supported by the National Natural Science Foundation of China(90604035)
文摘A novel high spectrum efficiency channel encoding method called overlapped code division multiplexing （OvCDM） is presented. It is a convolutional encoding method with code rate greater than 1. Compared with traditional coded modulation （CM） technologies, OvCDM emphasizes the constrain relation between encoded codes. It is actually a blind modulation. The simulation results in the additive white Gaussian noise （AWGN） channel indicate that OvCDM can significantly improve spectrum efficiency of mobile communications systems. Meanwhile, the proposed OvCDM can ensure high decoding performance.
基金upported by the National Natural Science Foundation of China!( 6 95 72 0 2 3)bytheKeyProjectfromtheShanghaiEducationComm
文摘In the context of object oriented video coding, the encoding of segmentation maps defined by contour networks is particularly critical. In this paper, we present a lossy contour network encoding algorithm where both the rate distortion contour encoding based on maximum operator and the prediction error for the current frame based on quadratic motion model are combined into a optimal polygon contour network compression scheme. The bit rate for the contour network can be further reduced by about 20% in comparison with that in the optimal polygonal boundary encoding scheme using maximum operator in the rate distortion sense.
文摘图像遥测系统是红外制导武器研制过程中必不可少的手段,但是由于导引头图像运动剧烈、携带信息量大,因此,适用于普通场景的码率控制算法难以直接应用于导引头图像遥测系统当中。对JM19.0使用的JVT-G012r1码率控制算法进行了分析,并根据导引头图像的特点提出一种结合感兴趣区域(Region of Interest,ROI)编码的码率控制算法,有效地对可用比特进行分配。同时以JM19.0软件为基础,对提出算法进行了仿真验证。仿真结果表明,与JVT-G012r1算法相比,该算法可以更好地适应导引头遥测图像的特点,提高感兴趣区域的图像质量,方便科研人员进一步分析研究。
