Image processing techniques for color flow-visualization photography. (2nd Report)

Autor:	Koji Hirose, Toru Uda, Tadao Fujiwara, Takashi Igi
Rok vydání:	1990
Předmět:	Pixel business.industry Mechanical Engineering Photography Image processing Condensed Matter Physics Path line Visualization Principal component analysis Computer vision Color flow Artificial intelligence business Digital filter Mathematics
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 56:58-66
ISSN:	1884-8346 0387-5016
DOI:	10.1299/kikaib.56.58
Popis:	The techniques reported in the preceding paper have been modified to remove defects in the methods. The trichromatic coordinates specifying white pixel were regarded as the values which were the average values at each resultant stimulus, S passed through a low-pass digital filter. The principal component obtained from residuals between their values and the coordinates of pixels was used to detect the co1ors of path line pixels, red, white or green. For pixel changing in colors found by the threshold of the derivative of the principal component, the colors were determined by cluster analysis. The correct combination of initial and terminal points in overlapping pathlines was obtained by using deviations in the length of the straight line joining initial and terminal points, averages of S for the pixels on the lines, and average angles between two lines. The procedure mentioned made it possible to derive velocity vectors automatically, and the results obtained were consistent with the photograph.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::827bea9a9b76e8ebb8bc67f059b1b0fd https://doi.org/10.1299/kikaib.56.58 Zobrazit plný text záznamu