s /= tempMat.at<double>(2, 0);

This line of code divides the scalar variable s by the value of the element at row 2 and column 0 in the matrix tempMat, which is presumably a double precision floating point value. This operation effectively scales down the value of s based on the distance between the detected object and the camera, which is represented by the third coordinate (z-axis) in the homogeneous coordinate system. This scaling factor is necessary to convert the homogeneous coordinates to Euclidean coordinates, which have a meaningful physical interpretation.

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tempMat2.at<double>(2, 0)

As an AI language model, I do not have access to the specific value of tempMat2.at<double>(2, 0) as it is dependent on the specific values of the matrix tempMat2. However, in general, this line of code is accessing the value in the third row (index 2) and first column (index 0) of a matrix of double precision floating point numbers.