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Definition of a lens

Lenses

A lens is a custom view of Connexions content. You can think of it as a fancy kind of list that will let you see Connexions through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to Connexions materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual Connexions member, a community, or a respected organization.

What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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Image Querying with Complex Wavelets: Results of Experiments

Module by: Tom Mowad, Venkat Chandrasekaran. E-mail the authors

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Summary: Gives quantiative results for the different approaches, highlighting strenghts and weaknesses of the old and new approaches.

We decided that for testing purposes we would test images from three categories:

hand-drawn images (using mspaint)
blurred images (which emulates scanned images)
shifted images

From each category, we performed five tests using query images based on images from our database. For every test image we used, except for hand drawn image 5 (shown below), the expected image was returned in the top three percent of matched images when using the complex wavelet algorithm. Results using the real wavelet algorithm were similar, except for on shifted images, where the query images had significantly lower rankings (on the range of top 15%) than from our algorithm.

**Figure 1**
hand drawn 1

**Figure 2**
actual image

**Figure 3**
hand drawn 2

**Figure 4**
actual image

**Figure 5**
hand drawn 3

**Figure 6**
actual image

**Figure 7**
hand drawn 4

**Figure 8**
actual image

**Figure 9**
hand drawn 5

**Figure 10**
actual image

**Figure 11**
blurred 1

**Figure 12**
actual image

**Figure 13**
blurred 2

**Figure 14**
actual image

**Figure 15**
blurred 3

**Figure 16**
actual image

**Figure 17**
blurred 4

**Figure 18**
actual image

**Figure 19**
blurred 5

**Figure 20**
actual image

**Figure 21**
shifted 1

**Figure 22**
actual image

**Figure 23**
shifted 2

**Figure 24**
actual image

**Figure 25**
shifted 3

**Figure 26**
actual image

**Figure 27**
shifted 4

**Figure 28**
actual image

**Figure 29**
shifted 5

**Figure 30**
actual image

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Definition of a lens

Lenses

A lens is a custom view of Connexions content. You can think of it as a fancy kind of list that will let you see Connexions through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to Connexions materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual Connexions member, a community, or a respected organization.

What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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More about this module: Metadata | Version History

This work is licensed by Tom Mowad and Venkat Chandrasekaran under a Creative Commons Attribution License (CC-BY 1.0), and is an Open Educational Resource.

Last edited by Tom Mowad on Dec 16, 2003 2:08 am US/Central.

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Image Querying with Complex Wavelets: Results of Experiments

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