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专利名称: 一种图像实时无损压缩方法
其他题名: Real-time lossless compression method for image
作者: 魏永旺; 罗海波; 陈永红; 惠斌; 常铮
所属部门: 光电信息技术研究室
专利权人: 中国科学院沈阳自动化研究所
专利代理: 沈阳科苑专利商标代理有限公司 21002
专利国别: 中国
专利类型: 发明授权
专利状态: 有效
摘要: 本发明涉及一种图像实时无损压缩方法,包括:根据输入原始图像的规格大小设定预测器长度;根据输入图像用改进JPEG-LS预测器进行预测,将实际值与预测值做差,得到残差并映射为非负整数,得到输入图像的预处理结果;根据输入图像的预处理结果按照分裂方式k的不同取值进行分裂、累加,并计算k=0,1,2,...,n-3时各情况下的总码长,取码长最小值所对应的k值,记为k*;n为输入图像像素值转换为二进制时的位宽;根据k*来对整幅图像的样本进行分裂,获得压缩码流并进行存储或传输。本发明对连续色调性较差的灰度图像特别是星载遥感图像可有效地降低整幅图像的空间冗余,减小样本均值,整个编码过程不会丢失任何信息,实现了无损压缩。
英文摘要: The invention relates to a real-time lossless compression method for an image. The method comprises the following steps: setting the length of a predictor according to the specification of an input initial image; predicting by using a JPEG-LS (Information T) predictor according to the input image, and carrying out subtraction on the actual value and the predicted value to obtain a residual which can be mapped to a nonnegative integer and a preprocessing result of the input image; dividing and accumulating according to the different values of division mode k and the preprocessing result of the input image, and calculating a total code length when k is equal to 0, 1, 2,..., n-3, marking a k value which corresponds to the minimum value of the code length as a k<*>, wherein n is a bit wide when the pixel value of the imported image is converted to a binary system; dividing a sample of the whole image according to the k<*> to obtain a compressed code steam for storing or transmitting. For a gray image with poor continuous color tonality, particularly a spaceborne remote sensing image, the invention can effectively reduce the space redundancy of the whole image and decrease the average value of the sample; and meanwhile, any information cannot be lost during the whole coding process and a lossless compression can be realized.
是否PCT专利:
申请日期: 2010-04-09
公开日期: 2011-10-12
授权日期: 2014-03-19
专利申请号: CN201010142893.5
公布/公告号: CN102215385B
语种: 中文
产权排序: 1
内容类型: 专利
URI标识: http://ir.sia.cn/handle/173321/14274
Appears in Collections:光电信息技术研究室_专利

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Recommended Citation:
魏永旺,罗海波,陈永红,等. 一种图像实时无损压缩方法. CN102215385B. 2011.
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