WE CLAIM:
1. An automatic polishing system comprising a polishing
robot holding a polishing tool and a polishing controller, the system being
configured such that under control of the polishing robot by the polishing
controller or control of the polishing robot and the polishing tool by the
polishing controller, the polishing tool carries out a polishing action on a
polishing subject face;
wherein there is provided a color intensity measurement instrument for measuring intensity of a specified color on the polishing subject face;
based on the intensity of the specified color measured by the color intensity measurement instrument, the polishing controller controls either the polishing robot alone or both the polishing robot and the polishing tool, so that an amount of polishing work by the polishing tool on the polishing subject face is adjusted according to the intensity of the specified color; and
the color intensity measurement instrument obtains a plurality of kinds of image data with different colors of irradiation light beam by causing the camera to photograph the polishing subject face with changing the color of irradiation light beam onto the polishing subject face and then measures the intensity of the specified color on the polishing subject face, based on the plurality of kinds of image data.
2. The automatic polishing system of claim 1,wherein:
there is provided a shape measurement instrument for
measuring a three-dimensional shape of the polishing subject face;
based on the three-dimensional shape measured by the shape measurement instrument, the polishing controller controls the polishing robot, whereby the polishing tool is moved to respective parts of the

polishing subject face one after another; and
concurrently with the movement, the polishing controller controls either the polishing robot alone or both the polishing robot and the polishing tool, so that the amount of polishing works by the polishing tool on the respective parts of the polishing subject face are adjusted according to the intensities of the specified color at the respective parts.
3. The automatic polishing system of claim 1 or 2, wherein:
there is provided a shape measurement instrument for
measuring a three-dimensional shape of the polishing subject face!
as the polishing treatment on the polishing subject face, the polishing controller effects an antecedent polishing treatment and a succedent polishing treatment;
in the antecedent polishing treatment, based on the three-dimensional shape measured by the shape measurement instrument, the polishing controller controls either the polishing robot alone or both the polishing robot and the polishing tool, so that the amounts of polishing works by the polishing tool on the respective parts of the polishing subject face are adjusted according to the three-dimensional shape; and
in the succedent polishing treatment, based on the intensity of the specified color of the respective part of the polishing subject face measured by the color intensity measurement instrument after the antecedent polishing treatment, the polishing controller controls either the polishing robot alone or both the polishing robot and the polishing tool, so that the amounts of polishing works by the polishing tool on the respective parts of the polishing subject face are adjusted according to the intensities of the specified color.
4. The automatic polishing system of claim 2 or 3, wherein:

there is provided a camera for photographing the polishing subject face;
the shape measurement instrument measures a three-dimensional shape of the polishing subject face based on image data of the polishing subject face obtained by the photographing by the camera; and
the color intensity measurement instrument measures the intensity of the specified color on the polishing subject face, based on the image data of the polishing subject face obtained by photographing by the camera.
5. The automatic polishing system of claim 4, wherein:
there is provided a measurement robot holding the camera; and
as the polishing controller controls the measurement robot, the
camera is moved to a requisite photographing position for the polishing subject face.
6. The automatic polishing system of any one of claims 1, 2, 3, 4 and 5, wherein the polishing controller controls the speed of movement of the polishing robot based on the intensity of the specified color, thereby to adjust the movement speed of the polishing tool on the polishing subject face, so that the polishing work amount of the polishing tool on the polishing subject face is adjusted according to the intensity of the specified color.
7. The automatic polishing system of any one of claims 1, 2, 3, 4 and 5, wherein as the polishing controller controls a rotational speed per unit time of the polishing tool of a drive rotation type, the polishing work amount of the polishing tool on the polishing subject face is

adjusted according to the intensity of the specified color.
8. The automatic polishing system of any one of claims 1, 2,
3, 4, 5, 6 and 7, wherein the specified color whose intensity is measured by the color intensity measurement instrument comprises a plurality of different colors.