code to extract region of interest(ROI) from central palmprint image with size 128x128?

Question

Taleb Almajrbi 2011-4-25

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6159-code-to-extract-region-of-interest-roi-from-central-palmprint-image-with-size-128x128

评论： Image Analyst 2018-2-2

[EDIT: Thu May 12 23:05:50 UTC 2011 Duplicate Removed - MKF]

hi all

how can i extract region of interest(ROI) from central palmprint image with size 128x128 by follow these steps:

Step 1. Apply a lowpass filter, such as Gaussian smoothing, to the original image, A threshold, Tp, is used to convert the convolved image to a binary image,

Step 2. Obtain the boundaries of the gaps, (Fx; Fy), between the fingers using a boundary tracking algorithm (see Fig. c).

Step 3. Compute the tangent of the two gaps. Let (x1; y1) and (x2; y2) be any points on (F1x; F1y) and (F2x; F2y), respectively. If the line passing though these two points satisfies the inequality, (Fiyj >= mFixj +c) for all i and j (see Fig. d), then the line (y = mx + c) is considered to be the tangent of the two gaps.

Step 4. Line up (x1; y1) and (x2; y2) to get the Y-axis of the palmprint coordinate system, and use a line passing through the midpoint of these two points, which is perpendicular to the Y-axis, to determine the origin of the coordinate system.

Step 5. Extract a subimage of a fixed size 128x128.

these steps are avalible in this tutorial

many thanks advanced for help