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Displacement mapping is an alternative computer graphics technique in contrast to bump mapping, normal mapping, and parallax mapping, using a (procedural-) texture- or height map to cause an effect where the actual geometric position of points over the textured surface are displaced, often along the local surface normal, according to the value the texture function evaluates to at each point on the surface. It gives surfaces a great sense of depth and detail, permitting in particular self-occlusion, self-shadowing and silhouettes; on the other hand, it is the most costly of this class of techniques owing to the large amount of additional geometry.
Method for calibrating an exposure table based on a tile
PendingCN122110620AImage analysisPhotomechanical exposure apparatusDisplacement mappingComputer graphics (images)
The application discloses a kind of exposure platform calibration methods based on board, method includes: step S1, according to the mapping relationship of calibration plate grid and suction cup position obtains standard theoretical suction cup coordinate, to establish the mapping relationship of sensor coordinate and theoretical suction cup coordinate;Step S2, with the theoretical suction cup coordinate of calibration plate as reference extension establishes virtual suction cup grid to cover the exposure area of suction cup;Step S3, moves calibration plate to virtual suction cup grid cover the exposure area of suction cup, takes feature point and obtains the sensor coordinate P2 of feature point, obtains the suction cup coordinate P1 of feature point based on the sensor coordinate P2 of feature point by the mapping relationship of sensor coordinate and theoretical suction cup coordinate, establishes the displacement mapping relationship between feature point suction cup coordinate P1 and feature point initial suction cup coordinate after moving;Repeat step S3, until calibration plate moving path covers all regions of virtual suction cup grid.According to the method of the embodiment of the application, with the advantages such as adaptability and high precision, small implementation difficulty.
Owner:HEFEI CHIP FOUND MICROELECTRONICS EQUIP CO LTD