大体上看了算法实现

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Yingfeng

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Feb 9, 2012, 9:23:47 PM2/9/12
to nise
每张图片都用80个sketching做表示,确实再如何优化,也很难让查询速度提升。已有的1.2s-2s 对于实用的搜索是难以接受的,因此,对于
80个feature有必要进一步压缩,最好是形成单一fingerprint,类似spectral hashing那样。但如果后者的话,
false positive和true positive会受到多大影响呢? 此外,单一fingerprint,还有没有更好的手段呢?

Wei Dong

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Feb 9, 2012, 9:29:49 PM2/9/12
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��һfingerprint�Ļ��޷�ʵ��sub-image��ѯ�����ֻ�������ͼƬ�����Ļ���
GIST��á����Լ��о���Ҫ��80�� feature����ѡ�����������ֻѡ20�����ҡ�
������ⲻ����ô�����������һ������˼���о����⡣

On 02/09/12 21:23, Yingfeng wrote:
> ÿ��ͼƬ����80��sketching����ʾ��ȷʵ������Ż���Ҳ�����ò�ѯ�ٶ��������е�1.2s-2s ����ʵ�õ����������Խ��ܵģ���ˣ�����
> 80��feature�б�Ҫ��һ��ѹ����������γɵ�һfingerprint������spectral hashing���������ߵĻ���
> false positive��true positive���ܵ����Ӱ���أ� ���⣬��һfingerprint������û�и�õ��ֶ��أ�


--
Wei Dong
Postdoc, EECS
University of Michigan

Yingfeng

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Feb 9, 2012, 10:49:29 PM2/9/12
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尝试过GIST+spectral hashing做整张图片的搜索,false positive很高,几乎不能接受

Cnc Cnc

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Feb 9, 2012, 10:52:13 PM2/9/12
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try some denosing steps?  like wavelet...
maybe the correlation of the pixels are too
high.
just my 2 cents.

 

2012/2/9 Yingfeng <yingfen...@gmail.com>
Message has been deleted

Wei Dong

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Feb 17, 2012, 7:45:20 AM2/17/12
to nisep...@googlegroups.com, Yingfeng
�����û�д��󣬾�������

On 02/16/2012 10:47 PM, Yingfeng wrote:
> �д��ط�����̫����
>
> ����query��80��sift descriptor��ÿ���ֱ�ת��һ��sketch
> �ڲ�ѯ��ʱ��ֻҪ��һ��sketch���У����͵����� Ҳ����˵�������Ϊ80��sketch���󲢲������ѵ����Ҵ����������


>
>
> On Feb 10, 10:23 am, Yingfeng <yingfeng.zh...@gmail.com> wrote:
>> ÿ��ͼƬ����80��sketching����ʾ��ȷʵ������Ż���Ҳ�����ò�ѯ�ٶ��������е�1.2s-2s ����ʵ�õ����������Խ��ܵģ���ˣ�����
>> 80��feature�б�Ҫ��һ��ѹ����������γɵ�һfingerprint������spectral hashing���������ߵĻ���
>> false positive��true positive���ܵ����Ӱ���أ� ���⣬��һfingerprint������û�и�õ��ֶ��أ�


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Wei Dong
http://www.wdong.org/

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