您的位置：首页 > 其它

fisher线性判别里的广义瑞丽商

2009-10-13 22:35 405 查看



..... Eq(1)


Here




..... Eq(2)


is the between-class covariance matrix.

And




..... Eq(3)


is the total within-class covariance matrix.

Differentiating Eq(1) with respect to

, we find that

is maximized when




..... Eq(4)


From Eq(2), we see that

is always in the direction of

. Furthermore, we do not care about the magnitude of

, only its direction, and so we can drop the scale factors

and

. Multiplying both sides of Eq(4) by

, we obtain




..... Eq(5)


Notice that if the within-class covariance matrix is isotropic, so that

is proportional to the identity matrix, then

is proportional to the difference between the class means.
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航