Cosmic-Ray Detection Based on Gray-Scale Morphology of Spectroscopic CCD Images

Cosmic Ray Rejection in STIS CCD Images

We describe the method of noise model-based cosmic ray (CR) rejection in multiple, registered images, and discuss its implementation in the context of the STIS calibration pipeline. We focus on the method by which the various contributions to the uncertainty in the final, calibrated image should be combined. Unfortunately, the current design of the CR rejection module, calstis2, makes it diffic...

Character Extraction from Gray Images Based on Mathematical Morphology

A morphology-based thresholding technique for character extraction from outdoor images is developed. Such extraction is traditionally difficult because of the influence of illumination changes, such as lightness, shadow, and reflection. Changes in character font, apparent size, and inclination also make extraction more difficult. Though there are some character reading systems for format and si...

Leaf Vein Extraction Based on Gray-scale Morphology

Leaf features play an important role in plant species identification and plant taxonomy. The type of the leaf vein is an important morphological feature of the leaf in botany. Leaf vein should be extracted from the leaf in the image before discriminating its type. In this paper a new method of leaf vein extraction has been proposed based on gray-scale morphology. Firstly, the color image of the...

Gray-scale hough transform for thick line detection in gray-scale images

Moment preserving detection of elliptical shapes in gray-scale images

A new method for elliptical shape detection based on the principle of gray and mass moment preserving is proposed. For each elliptical region in a gray-scale image, automatic bilevel thresholding based on gray moment preserving is used first to transform the blurred image in the region into a binary picture. The five parameters of the elliptical shape are then computed using the mass moment pre...