Phase Transform For Object And Shape Detection In Digital Images

Tech ID: 29786 / UC Case 2014-840-0


UCLA researchers in the Department of Electrical and Computer Engineering have developed a new edge algorithm to recognize objects and texture in digital images. The new algorithm outperform the state-of-the-art methods in visually impaired images.


Exponential growth in the amount of digital data generated by sensors and computers has caused great difficulty in analyzing the huge amount of the flooding data. In the past decades, many computer vision methods such as edge detection, object recognition, and machine learning algorithms have been developed for Big Data handling. The Canny edge detector is considered as a state-of-the-art however still can be further improved, especially under adverse image situations and conditions.


UCLA researchers proposed and demonstrated a new edge detection method where the image under analysis is passed through a phase transformation and the output phase image is post-processed to generate the edges and textures. The so-called Phase Stretch Transformation (PST) can be done by operating either in frequency domain or spatial domains.


Classification of object and texture in digital images.


  • Enhanced edge detection abilities and simplicity over state-of-the-art Canny’s method in low intensity and low contrast images 
  • Fast numerical implementation (not iterative)

State Of Development

The UCLA researchers have validated the new algorithm by demonstrating its utility in numerous example images including natural images and medical images.

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 10,275,891 04/30/2019 2014-840


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  • Jalali, Bahram

Other Information


Edge detection, phase transformation, frequency domain, spatial domain

Categorized As