彩色图

• By thoroughly exploring the correlation among the three color components of a color image , this paper presents a new method for color image compression coding from three aspects
  本文则着重于对彩色图象色彩空间相关性的研究，通过充分挖掘rgb三个色彩分量之间的相关性，从三方面提出对彩色图象进行压缩编码的新方法。
• Color print is red , yellow , portland , and four - color ink printing paper products in line with the formation of color images , this principle is known as cmyk , it is widely used in the four - color offset technology
  彩色印刷品是把红、黄、兰、黑四色油墨印制在纸制品上来形成彩色图象，这种原理被称为cmyk ，它被广泛应用于四色胶印技术。
• A watermarking system will be an effective and valuable tool to solve it . watermarks can be applied to digital data such as still images , audio , video , etc . this dissertation considers digital grayscale image exclusively
  在该算法中，水印是指一个含有版权等信息的可视位图，水印处理的对象是数字灰度图象，但经扩展，此算法可以应用于其它数字媒体，如彩色图象、音频和视频等。
• Secondly , based on the above method , this paper presents another new method for color image compression coding by using correlation of color components combined with wavelet transform . in this method , one of the three color components of a color image is coded using wavelet transform zerotree coding , and the component is segmented into several non - overlapping subregions of the same size . based on the calculated correlation coefficients between the component and the other two components in the same subregion , the coding for the other two components becomes the coding of correlation coefficients
  其二在上面这种方法的基础上，又提出了利用色彩分量相关性结合小波变换实现对彩色图象的压缩编码，该方法同样是对彩色图象三个色彩分量之一进行小波变换零树编码，将该色彩分量分割成若干个大小相等不重叠的子块，计算出该色彩分量在每个子块中与另两个色彩分量在同一子块的相关系数，由此对另两个色彩分量的压缩编码就转变成对相关系数的编码。
• From the point cloud surfaces , multi - layered geometry images are created which can represent the original models accurately very much . the compounded geometry image representation of point cloud surfaces , is also based on the former transform method , where the difference lies : take one of coordinates as the gray value and another two as location respectively , three different geometry images can be created . three gray images are combined into a compounded color image
  点云曲面的复合图象表示方法，首先把点云曲面中点的笛卡尔坐转换为球面极坐标，分别把球面极坐标[ r ， ， ]中的一个坐标转换为象素的灰度值，另外两个量转换为该象素的坐标，这样就可以得到三幅不同的图象，把这三幅灰度图象分别对应到彩色图象的r ， g ， b中去，就组合成为一幅复合彩色图象。
• Firstly , chromatism analysis and wavelet transform are used for color image compression coding . in this method , one of the three color components of a color image ( for example the g component of a rgb color image ) is coded using wavelet transform , and the chromatism between g and other two color components rg = r - g , bg = b - g is coded respectively using chromatism analysis . during decoding , g ~ is first reconstructed using wavelet inverse transform and inverse quantisation , and rg , bg are reconstructed using chromatism analysis inverse transform ; then r , b are calculated by r = g + rg and b = g + bg respectively
  其一是应用色差分析和小波变换对彩色图象进行压缩编码，该方法是对彩色图象的三个色彩分量之一，如rgb图象的g进行小波变换编码，而对g与另两个色彩分量的差值(即rg = r - g和bg = b - g )进行色差分析编码，解码则是通过反量化和小波逆变换得到g ^ ，通过色差分析的逆变换得到两个重构的色差rg ^和bg ^ ，再算出r ^ = g ^ + rg ^ 、 b ^ = g ^ + bg ^ ，最后由r ^ 、 g ^ 、 b ^重构图象。
• Among domestic and international literature about color image compression coding technique , compression coding methods for color image almost all use separated coding for three color components of a color image , and decoding methods also decode three color components of a color image respectively to synthesize and restore the color image , without further exploring deeper relationship between the three color components . this paper focuses on research about correlation of color space of a color image
  纵览国际国内有关彩色图象压缩编码技术方面研究的文献中，对彩色图象的压缩编码，几乎都是采用分别对彩色图象的三个色彩分量进行单独编码，解码时同样是对三个色彩分量分别进行解码，然后再合成恢复彩色图象，而没有去进一步挖掘的三个色彩分量之间存在的更深层的关系，要想进一步提高图象的信噪比、压缩比及图象的视觉效果和编码效率是难以如愿的。
• In this thesis , the theories and methods of ga are analyzed in detail , the trend of ga in recent times is briefly discussed . because of the importance of image segmentation , two methods of color image segmentation based on ga are proposed . one is the surface of thresholds image segment method , the other is entropic threshold method
  本篇论文比较详细地论述了遗传算法的基本理论、方法，指出了算法的研究现状，由于图象分割的重要性，提出了两种基于遗传算法的彩色图象分割方法，即阈值曲面分割方法和最佳熵阈值分割方法，通过vc + + 6 . 0编程得到了实验验证，比较了两种算法的性能，证明遗传算法完全适用于图象的优化问题。