Adaptive sharpening of photos

Safonov, Ilia V.; Rychagov, Michael N.; Kang, Ki-Min; Kim, Sang Ho

doi:10.1117/12.758613

Cited by 15 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…23 (9) filter, which increases the local contrast with removal of noise based on guiding image. 95,96 The reference sharpness level of the guiding image acts as edge preserving to result in this adaptive sharpening (see Fig. 7).…”

Section: Resultsmentioning

confidence: 99%

Image-guided filtering for improving photoacoustic tomographic image reconstruction

Awasthi¹,

Kalva

Pramanik

et al. 2018

J. Biomed. Opt.

View full text Add to dashboard Cite

Several algorithms exist to solve the photoacoustic image reconstruction problem depending on the expected reconstructed image features. These reconstruction algorithms promote typically one feature, such as being smooth or sharp, in the output image. Combining these features using a guided filtering approach was attempted in this work, which requires an input and guiding image. This approach act as a postprocessing step to improve commonly used Tikhonov or total variational regularization method. The result obtained from linear backprojection was used as a guiding image to improve these results. Using both numerical and experimental phantom cases, it was shown that the proposed guided filtering approach was able to improve (as high as 11.23 dB) the signal-to-noise ratio of the reconstructed images with the added advantage being computationally efficient. This approach was compared with state-of-the-art basis pursuit deconvolution as well as standard denoising methods and shown to outperform them.

show abstract

Section: Resultsmentioning

confidence: 99%

Image-guided filtering for improving photoacoustic tomographic image reconstruction

Awasthi¹,

Kalva

Pramanik

et al. 2018

J. Biomed. Opt.

View full text Add to dashboard Cite

show abstract

“…Moderate application only in blocks, affected by artifacts, helps to avoid over-blurring of the image. Effectiveness of using bilateral filter was also recently demonstrated for adaptive sharpening of photos [21].…”

Section: Ringing Artifacts Correctionmentioning

confidence: 96%

Removal of blocking and ringing artifacts in JPEG-coded images

Tolstaya

Rychagov

Kim

et al. 2010

Digital Photography VI

Self Cite

View full text Add to dashboard Cite

The paper relates to a method for effective reduction of artifacts, caused by lossy compression algorithms based on block-based discreet cosine transform (DCT) coding, known as JPEG coding. Most common artifacts produced by such type of coding, are blocking and ringing artifacts. To reduce the effect of coding artifacts caused by significant information loss, a variety of different algorithms and methods has been suggested. However, the majority of solutions propose to process all blocks in the image, which leads to increase of processing time, required resources, as well as image over-blurring after processing of blocks, not affected by blocking artifacts. Techniques for ringing artifact detection usually rely on edge-detection step, a complicated and versatile procedure with unknown optimal parameters. In this paper we describe very effective procedures for detection of artifacts, and their subsequent correction. This approach helps to save notable amount of computational resources, since not all the blocks are involved in correction procedures. Detection steps are performed in frequency domain, using only DCT coefficients of an image. Numerous examples have been analyzed and compared with the existent solutions, and results prove the effectiveness of proposed technique.

show abstract

“…The second peak located at Juniper Online Journal Material Science λ=419.4nm is corresponding to the band gap energy, and it can observe that the second peak shifted to a higher wavelength by increasing V2O5 concentration. This concerning to the structural rearrangement of the glass matrix and the modifier [8,21]. It was also regarded to the changes in bonding in the glassy network as the metal content was increased [22,23].…”

Section: Optical Properties Uv-visible Absorption Spectrummentioning

confidence: 99%

Enhancement of Optical Properties of Borate Glass Doped with Vanadium Oxide

Henaish

2022

JOJMS

View full text Add to dashboard Cite

In this work we examine physical, structural and optical properties of borate glass via experimental and theoretical techniques. The composition of our glass samples is (50-X) B 2 O 3 + 50 Pb 3 O 4 + X V 2 O 5 encoded into [BPV glass system] where x= (0, 0.1, 0.2, 0.3, 0.4 and 0.5) were prepared using melt quenching method. X-ray diffraction technique confirmed the formation of BPV glass system. Characteristic absorption bands were observed in infrared spectra assigned to vibrational modes. The optical properties of the prepared samples were measured using UV-visible spectra and Photoluminescence. The optical energy band gap E g (direct and indirect) calculated using Tauc,s equation and found that direct energy gap decreases from 2.42 ev to 2.26 ev and indirect energy gap decreases from 2.57 ev to 2.52 ev as vanadium oxide increase and that Urbach energy Eu decreased from 0.21 ev to 0.18 ev. The refractive index increased by V 2 O 5 content increased and steepness parameter increased also. The dielectric constant (ε) and optical conductivity (σ) have the same behavior decrease by increasing vanadium oxide content. Photoluminescence shows an emission wavelength that ranges from 400 nm to 1000 nm.

show abstract

Adaptive sharpening of photos

Cited by 15 publications

References 0 publications

Image-guided filtering for improving photoacoustic tomographic image reconstruction

Image-guided filtering for improving photoacoustic tomographic image reconstruction

Removal of blocking and ringing artifacts in JPEG-coded images

Enhancement of Optical Properties of Borate Glass Doped with Vanadium Oxide

Contact Info

Product

Resources

About