The Principle and Conditions of Discriminating High Temperature Forgings in Multicolor CCD Image

In order to realize boundary identification and provide basic for size measurement of the high temperature forging by multicolor CCD, the paper analyses the monochrome irradiation response characteristic of the high temperature forging and its surrounding scenery and the irradiation response characteristic of the multicolor CCD. The result is obtained that the intersection point critical wavelength exists in the monochrome irradiation response characteristic curves of multicolor CCD to the forging and the surrounding. When wavelength is more than the critical wavelength, monochrome irradiation response of high temperature forging will be greater than that of the surrounding scenery, and the pixel gray of high temperature forging is greater than that of the surrounding scenery. It is put forward that the principle of discriminating the high temperature forging from its surrounding scenery by using the pixel gray difference in the wavelength of more than the critical wavelength. It is presented that the condition of discriminating high temperature forgings in multicolor CCD image is the pixel gray of the high temperature forging is greater than that of all the sceneries. In order to discriminating high temperature forgings in multicolor CCD image, critical wavelength must locate in the photosensitive area of the multicolor CCD. The smaller the critical wavelength is the better the discriminating effectiveness is.