公开(公告)号：US06668089B1

公开(公告)日：2003-12-23

申请号：US09509665

申请日：2000-07-14

Applicant: Javier Bracamonte ,  Frédéric Barman ,  Michael Ansorge ,  Fausto Pellandini

Inventor： Javier Bracamonte ,  Frédéric Barman ,  Michael Ansorge ,  Fausto Pellandini

IPC: G06K936

CPC classification number: H04N19/192 ,  H04N19/126 ,  H04N19/146 ,  H04N19/152 ,  H04N19/176 ,  H04N19/60

Abstract: The present invention relates to a process for controlling the compression ratio of digital images. This process consists of compressing a digitized image by means of a conventional process such as that known by the abbreviation JPEG. The compression ratio of the image is modified by modifying a parameter of the JPEG process, called the scale factor. According to the invention this scale factor is modified until the compression ratio obtained lies in a range of tolerance of the desired compression ratio. The process uses and approximation to the actual curve of the compression ratio as a function of the scale factor, in order to minimize the number of iterations needed to attain the desired compression ratio.

Abstract translation: 本发明涉及一种用于控制数字图像的压缩比的方法。该方法包括通过诸如缩写JPEG已知的常规处理压缩数字化图像。 通过修改称为比例因子的JPEG过程的参数来修改图像的压缩比。 根据本发明，该比例因子被修改，直到获得的压缩比位于所需压缩比的公差范围内。 该过程使用和逼近作为缩放因子的函数的压缩比的实际曲线，以便最小化达到所需压缩比所需的迭代次数。