please help...How to find the left-most and right-most corners points of the mouth and calculate the distance between them?

Hi, I am not quite sure how to select the left-most and right-most corners points from the cluster of pixels that are detected in the mouth region, and after selecting the left-most and right-most corners points how do i calculate the distance between them?

Thank you in advance

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

[Anand]

can anyone help me with finding the distance between 2 points using hypot(a, b), norm(a,b) or sqrt((x2-x1)^2+(y2-y1)^2) method?

thank you

Answer 1

[Image Analyst]

I would think hypot(a, b) would work, or norm(a,b) or sqrt((x2-x1)^2+(y2-y1)^2). Did you try any of those methods?

[Anand]

Hi, how would i use this method in matlab " sqrt((x2-x1)^2+(y2-y1)^2)".

when i run the code in matlab there are many points that are detected within the mouth region, i want to select both of the corner points of the mouth and calculate the distance to the corner points in the eyes. would you able to give me example on how to do this?

thankyou

[Anand]

The point with the smallest y-coordinate is the left most, the point with the largest y-coordinate is the right most. The distance between them can be found using hypot as ImageAnalyst suggested.

[Anand]

Ok i understand that, but how do i view the coordinates after executing the code so i know which one is the smallest y-coordinate and the largest y-coordinate.

[Anand]

>> corners.Location

[Anand]

as you mentioned "The point with the smallest y-coordinate is the left most, the point with the largest y-coordinate is the right most"

points in mouth region:-

107.0192  342.0349
112.7923  345.3988
121.1538  327.0072
127.0492  345.0479
129.0120  345.1025
132.7288  346.3319
135.6974  355.0060
137.0973  344.4568
137.2201  378.8838
138.5056  350.7361
142.1838  351.2438
142.0653  377.8724
144.9402  351.5071
146.4346  356.3987
150.6828  347.7409
154.9602  350.1777
156.3195  326.3300
157.2722  378.5677
160.0357  354.1214
166.1089  346.3039
172.1073  345.4921
180.2071  320.6378
188.2948  344.3862
192.0639  342.3253

smallest y-coordinate = 320.6378 Largest y-coordinate = 378.8838

I am really confused on how to implement this method sqrt((x2-x1)^2+(y2-y1)^2) to find the distance.

can you please help me.