Method for inspection and detection of defects on surfaces of disc-shaped objects and computer system with a software product for carrying out the method

An image (30) of a disc-shaped object (100) is recorded, wherein the entire surface (100O) is captured with a plurality of fields (60). A difference image (31) is formed, by subtracting a reference from each field (60) of the surface (100O) of the disc-shaped object (100), and subject to a color transformation, wherein by a suitable choice of transformation signals in one channel are maximized, while at the same time undesired variations, caused by production, of the fields (60) are moved to a different channel. That combination of transformation and detection channel is chosen for which the largest number of pixels of a field (60) with the defect to be found are located outside the spread of the pixels of the respective field (60) on the surface (100O) of the respective disc-shaped object (100) from production and provide the largest signals for the defect.