流れのカラー可視化写真の画像処理方法　（続報）

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

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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.

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