Question 22: Given a 2 \times 2 second moment matrix of edge pixels: …

Given a $2 \times 2$ second moment matrix of edge pixels:

$M = \begin{bmatrix} 1 & 2 \\ 2 & 1 \end{bmatrix}$

obtained during the Canny edge detection process, compute the measure of straightness defined as:

$\text{Straightness} = \frac{\lambda_{\min} - \lambda_{\max}}{\lambda_{\max} + \lambda_{\min}}$

where $\lambda_{\max}$ and $\lambda_{\min}$ are the maximum and minimum eigenvalues of $M$ respectively.

The value of the straightness is __________