Due to its physical nature, the solar corona exhibits large spatial variations of intensity that make it difficult simultaneously visualize features present at all levels and scales. Many general-purpose specialized filters have been proposed enhance coronal images. However, most them require ad hoc tweaking parameters produce subjectively good results. Our aim was develop a general purpose ima...

An innovative technique for the enhancement of digital color images captured under extremely nonuniform lighting conditions is proposed in this paper. The key contributions of this technique are adaptive intensity enhancement, contrast enhancement and color restoration. Simultaneous enhancement of extreme dark and bright intensity regions in an image is performed by a specifically designed Loca...