Supplementary document for Design method of imaging optical systems using confocal flat phase elements - 6158248.pdf

Detailed discussions of Eqs. (7) and (8) in the paper are demonstrate

Flowchart of our multiple feature sparse coding method.

<p>Flowchart of our multiple feature sparse coding method.</p

Impact on retrieval accuracy with different combining parameters for SURF and color features.

<p>Impact on retrieval accuracy with different combining parameters for SURF and color features.</p

Retrieval results with multiple features on UKB dataset.

<p>Retrieval results with multiple features on UKB dataset.</p

Retrieval results with multiple features on Holidays dataset.

<p>Retrieval results with multiple features on Holidays dataset.</p

Histogram of sum pooling results.

<p>(a) Visual codes C3, C4 generated by distinctive patches on the background. (b) Visual codes C4 generated by frequent patches on the background.</p

Distance between similar and dissimilar images on UKB dataset.

<p>(a) The probability density of <i>L</i>₁ norm distance with sum pooling. (b) The probability density of <i>L</i>₁ norm distance with max pooling.</p

Impact on sparsity coefficient with different pooling schemes.

<p>(a) Sum pooling; (b) Max pooling; <b>(c)</b> Modified pooling.</p

Retrieval results with multiple features on Zurich dataset.

<p>Retrieval results with multiple features on Zurich dataset.</p

Frequent patches and distinctive patches.

<p>(a) Example images which include frequent patches on the background. (b) Example images which include distinctive patches on the background.</p