by Discount Bluehost

Seal Exercise

Published: Thursday, 26 December 2013


Oil pump in the transmission box of a car. The circular seal is present (left), the seal is missing (right).

Task: Check whether the seal is in place.

Approach: Threshold the whites of the images. Write a point marker x in the middle of image. Generate two isotropic dilates of x whose set difference makes a ring at the place where the seal should be. Compute the integrals of the two numerical images in the ring. Note that the seals do not need to be extracted.

Keywords: translation variant operation, isotropic dilation, measure.

With seal and without seal after growth geodesic from Centre of radius corresponding to the wheel.

#The idea here is to locate the correct radius where the seal exists and grow the central regions of the motors to obtain the annular ring which masks the seal.

#extracting the central rings or crowns by dilating from the central part (since the wheel rotates and the centre changes) - The crown needs to cover the part where the seal should exist

Average pixel count in the Annular Ring residues from image 4(below):

Without seal = 0.5486297607421875 pixels

With seal = 10.544586181640625 pixels



Thresholded Images


Central Regions


Annular rings at the location of the seal.


Extracting the pixels at the annular rings using 3 as mask over 1 (set difference).


Images are shown in pairs: with seal (left) and without seal (right).

Comment: The circular central regions (in 2) and the seal (in 3) have the same center. However the location of this center varies with the image. The annular ring mask is constructed specifically for each image of the motor. The final measurement of the residue when there is no seal can afford some slack.

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