Frequency Domain Pseudo-color to Enhance Ultrasound Images

Jakia Afruz, Va’Juanna Wilson, Scott E Umbaugh

Abstract


In digital image processing, image enhancement is employed to give a better look to an image. Color is one of the best ways to visually enhance an image. Pseudo-color refers to coloring an image by mapping gray scale values to a three dimensional color space. In this paper we used a pseudo-color technique in frequency domain to enhance ultrasound images. We used three different types of transforms to do this. These are the Fourier transform, Discrete Cosine transform and Walsh- Hadamard transform. After obtaining these pseudo-color images, we applied a high frequency emphasis filter or histogram stretch as a post process. In this paper we used a subjective study to compare images. First we compared pseudo-color images to their original monochrome images.  Secondly, we compared all the three different types of transforms. Lastly, we compared the post processing techniques.


Full Text: PDF DOI: 10.5539/cis.v3n4p24

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This work is licensed under a Creative Commons Attribution 3.0 License.

Computer and Information Science   ISSN 1913-8989 (Print)   ISSN 1913-8997 (Online)
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