Sir, I read with interest the article ‘Enhancing digital images using unsharp-mask’ by Taneja.[1] The author has discussed a really interesting aspect of dermatological photography. The use of a sharpening tool is definitely helpful in enhancing communication via images, especially in the context of seeing images on the monitor screens, like in teledermatology, but whether and to what extent th...

Digital mammography systems allow manipulation of fine differences in image contrast by means of image processing algorithms. Different display algorithms have advantages and disadvantages for the specific tasks required in breast imaging-diagnosis and screening. Manual intensity windowing can produce digital mammograms very similar to standard screen-film mammograms but is limited by its opera...

nonlinear diffusion filtering, deblurring, denoising An implicit, one-step method for the restoration of blurred and noisy color images is presented. Using a nonlinear partial differential equation (PDE)-based variational restoration approach, it is shown that a single iteration yields a result that is visually superior to performing Gaussian low-pass filtering, followed up by unsharp masking, ...

This article explores an energy function and its minimization for the weighted gradient domain image processing, where variable weights are applied to the data term of conventional function for attaining better results in some applications. To be specific, larger weights are given to the regions where original pixel values need to be kept unchanged, like strong edge regions in the case of image...

Abstract Semi-device-independent certification of an unsharp instrument has recently been demonstrated (2019 New J. Phys. 21 083034) based on the sequential sharing quantum advantages in a prepare-measure communication game by assuming system to be qubit. In this work, we provide device-independent (DI) self-testing through violation two Bell inequalities where devices are uncharacterized and d...

We report the first high spatial resolution measurement of magnetic fields surrounding LkH$\alpha$ 101, a part Auriga-California molecular cloud. The observations were taken with POL-2 polarimeter on James Clerk Maxwell Telescope within framework B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization thermal dust emission at 850 $\mu$m is found to be mostly associat...

The GNU Image Manipulation Program, commonly abbreviated as “the Gimp,” is a free, open-source image editing program. Many photo restoration techniques exist to enhance images by making them clearer. This project focused on automating a powerful, yet complicated, method called “smart” sharpening. To accomplish this, a script was written in the Gimp’s Script-Fu language. After completion of the ...

at the highest signal levels, the masking function for the off-frequency condition seems to become more linear. while some basilar membrane data show more linear growth at high levels, others do not. aim of the present study is to assess function of masking at high levels regarding its clinical appearance. in this experiment we evaluated the hearing thresholds of three different signals (wide-b...