Simultaneous storage of medical images in the spatial and frequency domain: A comparative study

Jagadish Nayak, P. Subbanna Bhat, Acharya U. Rajendra, U. C. Niranjan

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Background. Digital watermarking is a technique of hiding specific identification data for copyright authentication. This technique is adapted here for interleaving patient information with medical images, to reduce storage and transmission overheads. Methods. The patient information is encrypted before interleaving with images to ensure greater security. The bio-signals are compressed and subsequently interleaved with the image. This interleaving is carried out in the spatial domain and Frequency domain. The performance of interleaving in the spatial, Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) coefficients is studied. Differential pulse code modulation (DPCM) is employed for data compression as well as encryption and results are tabulated for a specific example. Results. It can be seen from results, the process does not affect the picture quality. This is attributed to the fact that the change in LSB of a pixel changes its brightness by 1 part in 256. Spatial and DFT domain interleaving gave very less %NRMSE as compared to DCT and DWT domain. Conclusion. The Results show that spatial domain the interleaving, the %NRMSE was less than 0.25% for 8-bit encoded pixel intensity. Among the frequency domain interleaving methods, DFT was found to be very efficient.

Original languageEnglish
Article number17
JournalBioMedical Engineering Online
Volume3
DOIs
Publication statusPublished - 05-06-2004
Externally publishedYes

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Fourier Analysis
Discrete Fourier transforms
Wavelet Analysis
Discrete cosine transforms
Discrete wavelet transforms
Pixels
Differential pulse code modulation
Data Compression
Computer Security
Digital watermarking
Data compression
Authentication
Cryptography
Luminance

All Science Journal Classification (ASJC) codes

  • Radiological and Ultrasound Technology
  • Biomaterials
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

Cite this

Nayak, Jagadish ; Bhat, P. Subbanna ; Rajendra, Acharya U. ; Niranjan, U. C. / Simultaneous storage of medical images in the spatial and frequency domain : A comparative study. In: BioMedical Engineering Online. 2004 ; Vol. 3.
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Simultaneous storage of medical images in the spatial and frequency domain : A comparative study. / Nayak, Jagadish; Bhat, P. Subbanna; Rajendra, Acharya U.; Niranjan, U. C.

In: BioMedical Engineering Online, Vol. 3, 17, 05.06.2004.

Research output: Contribution to journalArticle

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