In a first exemplary embodiment of the present invention, an automated, computerized method is provided for determining an illumination boundary in an image. The disclosed semiconductor integrated circuit device also includes an output fixing circuit configured to generate a pulse that is maintained at a high level or a low level during a certain period, to perform an OR operation on the output signal from the selection circuit and the generated pulse, and to output a result of the OR operation as the output clock signal. An infrared camera photographs an infrared image reflected from the curved screen. Thus, a signal matching is given at the branching point, so that no amplitude or signal rise time distortions of the excitation signals occur at the inputs of the devices under test.