会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Method and apparatus for selecting compression method and for
compressing file using the selected method
    • 使用所选方法选择压缩方法和压缩文件的方法和装置
    • US5838821A
    • 1998-11-17
    • US615821
    • 1996-03-14
    • Akio MatsubaraHayashi Taniguchi
    • Akio MatsubaraHayashi Taniguchi
    • H04N19/00G06F5/00G06T9/00H03M7/30H04N1/41H04N1/413H04N19/12H04N19/136H04N19/157H04N19/196H04N19/46H04N19/70G06K9/00
    • G06T9/00
    • A method and system for automatically determining a compression method to be used on a file. A histogram of the file is constructed in order to determine if there are a predetermined number of consecutive byte patterns below a set threshold. If this condition exists, the file is not an image file and compression can be performed using the lossless Lempel-Ziv compression method. If, over the range of the histogram, the file is above the predetermined threshold, the histogram is examined to determine if the average value in the histogram is in a central portion of the histogram. If it is not, the file does not represent an image and again, the Lempel-Ziv compression method is used. If both the byte patterns and the histogram exceed the predetermined threshold and the average of the histogram is in a central portion, the file is determined to contain an image. Based on the gradation or number of bits necessary to represent the byte patterns of the file, an appropriate image compression method is used to compress the file.
    • 一种用于自动确定要在文件上使用的压缩方法的方​​法和系统。 构建文件的直方图以便确定是否存在低于设定阈值的预定数量的连续字节模式。 如果存在这种情况,文件不是图像文件,并且可以使用无损的Lempel-Ziv压缩方法执行压缩。 如果在直方图的范围内文件高于预定阈值,则检查直方图以确定直方图中的平均值是否在直方图的中心部分。 如果不是,则文件不会代表图像,并且再次使用Lempel-Ziv压缩方法。 如果字节图案和直方图都超过预定阈值,并且直方图的平均值在中心部分,则该文件被确定为包含图像。 基于表示文件的字节模式所需的位数或位数,使用适当的图像压缩方法来压缩文件。