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 ...

We develop sensor transformations, collectively called spectral sharpening, that convert a given set of sensor sensitivity functions into a new set that will improve the performance of any color-constancy algorithm that is based on an independent adjustment of the sensor response channels. Independent adjustment of multiplicative coefficients corresponds to the application of a diagonal-matrix ...

It has now been 20 years since the seminal work by Finlayson et al. on the use of spectral sharpening of sensors to achieve diagonal color constancy. Spectral sharpening is still used today by numerous researchers for different goals unrelated to the original goal of diagonal color constancy e.g., multispectral processing, shadow removal, location of unique hues. This paper reviews the idea of ...

Features • Low-power CMOS image sensor with integrated image flow processor (IFP) and video encoder • 1/4-inch optical format, VGA resolution (640H x 480V) • ±2.5% additional columns and rows to compensate for lens alignment tolerances • Integrated lens distortion correction • Overlay generator for dynamic bitmap overlay • Integrated video encoder for NTSC/PAL with overlay capability and 10-bit...

Comb filters are a class of low-complexity filters especially useful for multistage decimation processes. However, the magnitude response of comb filters presents a droop in the passband region and low stopband attenuation, which is undesirable in many applications. In this work, it is shown that, for stringent magnitude specifications, sharpening compensated comb filters requires a lower-degre...

Contrast-sharpening is a fundamental feature of mammalian sensory perception. Whereas visual contrast-sharpening has been fully understood in terms of the retinal neuronal wiring [DeVries, S. H. & Baylor, D. A. (1993) Cell 72, Suppl., 139-149], a corresponding explanation of auditory contrast-sharpening is still lacking. Here, we show that the essentials of auditory contrast-sharpening can be e...

Image sharpening refers to any enhancement technique that highlights edges and fine details in an image. The conventional methods for sharpening the images has several drawbacks such as, complex and slow calculations, color loss, anisotropy effects etc. In this paper, a new fuzzy filter is proposed for sharpening the color images. The sharpening fuzzy filter consists of two sub-filters. The fir...

A robust and efficient finite volume method with interface sharpening technique has been developed to solve the six-equation multi-fluid single-pressure model for compressible two-phase flows. The numerical is implemented in a three-dimensional vertex-centered code. least-squares reconstruction Kuzmin's vertex-based (VB) limiter fraction set of primitive variables presented framework. In region...