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The observation of cracks which curved crack path has to be doneoptically. It is shown that a modified commercial flat bed scanner and a combination ofhigh-resolution scanner camera system with 10,000 x 10,000 pixels with telecentric lensare appropriate for high-resolution (up to 8 μm / Pixel) optical registration of multiplecrack ends on sample areas up to 210 mm x 290 mm. The registered high-resolutionimages are suitable for determination of crack length. It is also possible to measurecrack paths or geometrical crack tip parameters and strain fields by image correlation.The method is used to determine crack resistance and crack growth curves on CCT- andbiaxial cruciform samples.