Hierarchical grouping and window scoring are two important branches of region proposal. Each branch has its advantages and disadvantages. We propose a novel region proposal framework based on saliency detection to integrate their advantages. We first use salient region detection method to divide an image into salient regions and non-salient regions. In salient regions, we use hierarchical grouping method to generate proposals. On the contrary, in the nonsalient regions, we use window scoring method. At last, linear combination is employed to fuse the different scores of these two methods. Experiments show that our method achieves the superior quality to the state-of-the-arts.
A multi-channel surface-enhanced Raman scattering (SERS) probe based on a multi-core photonic crystal fiber (PCF) is
investigated. The multi-core fiber contains seven hollow core PCFs arranging in a compact hexagon pattern that one PCF
is in the center with six other surrounded, and the total diameter including the protective jacket is less than 200μm. The
seven PCFs can guide light respectively, providing seven channels for sensing. The excitation light is coupled into each
core from one end (measuring-tip) of the fiber while the sample entrance is at the other end (probing-tip). Analyte
solution mixed with the silver nanoparticles enters each core via the capillary effect, and the silver nanoparticles serve as
the SERS substrate. The excitation light transmitting in each hollow core can interact directly with the analyte and the
silver nanoparticles in the air cores along the fiber axis. The SERS signal scattered by the sample propagates through the
fiber back to the measuring-tip; then couples out of the fiber into the Raman spectrometer. Comparing to a single core
PCF SERS probe, the multi-core probe not only takes the advantages of high efficiency of light usage and large
interaction space for SERS in each channel, but also is more robust and could provide multi-data. Basing on the seven
data of the analyte from the seven channels, an accurate average result could be achieved with less instability. Different
concentration Rhodamine 6G solutions have been used as test samples, and the multi-channel sensing idea has been
demonstrated by the proof-of-concept experiments.
We demonstrate, for the first time to our knowledge, a hollow core photonic crystal fiber
(HCPCF) surface-enhanced Raman probe. The probe consists of a HCPCF (also known as a
holey fiber) with a layer of Au nanoparticles coated on the inner surface of the air holes serving
as the substrate of surface enhanced Raman scattering (SERS). The sample being tested enters
the air holes by the capillary effect. The excitation light is coupled into the fiber core from one
end (measuring-tip) while the sample entrance is at the other end (probing-tip) of the fiber. The
SERS signal scattered by the sample propagates through the fiber core back to the measuring-tip;
then is coupled out of the fiber into the Raman spectrometer. The advantages of such probes
include, the confinement of light inside the HCPCF provides a higher light efficiency; and the
nanoparticles coated inside the air holes offers a larger interaction area for SERS. Both
experimental results and theoretical analysis are presented and discussed.
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