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-Since computing eigenvalues can be expensive, it is preferred to calculate the score $R = det(M)-k\cdot trace(M)^2$,​ where $k$ is an empirically determined constant, in order to compute the "​cornerness"​ of a point.+Since computing eigenvalues can be expensive, it is preferred to calculate the score $R = det(M)-k\cdot trace(M)^2$,​ where $k$ is an empirically determined constant, in order to compute the "​cornerness"​ of a point. $R$ preserves information about the eigenvalues since $det(M) = \lambda_1\lambda_2$ and $trace(M) = \lambda_1 + \lambda_2$ but it is also easier to calculate.