Transform amplitude sharpening: a new method of image enhancement
A new frequency-domain based technique is proposed. In the proposed method, the magnitude of the Fourier transform of the image is modified using a novel amplitude change function with the phase kept invariant. The inverse transform of the new 2-D transform results in an enhanced image. The amplitude change function used is the Tukey's twicing function. In many applications, multiple use of the twicing function is shown to yield better results. The proposed method is somewhat similar to the alpha-rooting method but does not suffer from certain objectionable artifacts associated with the latter and also exhibits less degradation due to noise. A postprocessing of the enhanced image generated using the proposed transform amplitude method via histogram modification has been found to improve the picture quality. A number of image enhancement examples are included illustrating the effectiveness of the proposed method. 6 refs., 14 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5166948
- Report Number(s):
- LA-10825-MS; ON: DE87000810
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
A new stationary gridline artifact suppression method based on the 2D discrete wavelet transform
Pitfalls of using conventional and discrete Radon transforms on poorly sampled data
Related Subjects
IMAGE PROCESSING
ALGORITHMS
DIGITAL FREQUENCY ANALYSIS
FOURIER TRANSFORMATION
TWO-DIMENSIONAL CALCULATIONS
FREQUENCY ANALYSIS
INTEGRAL TRANSFORMATIONS
MATHEMATICAL LOGIC
PROCESSING
TRANSFORMATIONS
990200* - Mathematics & Computers