Contrast stretching or Normalization is one such operation applied on images, which improves the contrast of the image so that the details present in the image can be clearly seen. Point operation on spatial domain: Contrast stretching is applied directly on the image by modifying each pixel prese...
Before discussing the proposed method and enhancement and transformation functions, we present some previous strategies used for contrast stretching. For image enhancement, some classical techniques such as transform, point, and spatial operations have been used [24]. In the transformation operation, vari...
Image enhancement methods do not consider the physical model of image degradation and directly process the image pixel by pixel to improve the visual quality of underwater images, such as histogram stretching, Retinex, and fusion methods [11,12,13]. Although these methods can improve the contrast...
The greyscale adjustments were performed using open source image processing software ImageJ, v. 1.52p (National Institutes of Health; Bethesda, MD, USA). 3. Results and Discussion 3.1. Synthesis of Gd(Tb)F3:Tb3+(Gd3+),Yb3+,Nd3+@P(DMA-AGME)-Ale Nanoparticles Gd(Tb)F3:Tb3+(Gd3+),Yb3...
In the P(PEGMA-AA) molecule, there is a single carbonyl frequency at 1723 cm−1, resembling a combination of the carbonyls of PEGMA ester and dissociated (acrylate) AA, and suggesting an interaction between those via, for example, H-bonding [42]. The carbonyl C=O stretching of P(PEGMA...