傅楸善臺灣大學：資訊工程學研究所陳世明Chen, Shih-MingShih-MingChen2007-11-262018-07-052007-11-262018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/53935Digital camera test is very important. Manufactures have to measure and test many items and then calibrate to make the camera perfect. Test station is at the end of assembly line in factory. The test time and items become very important. Camera test methodology is an art. There are many tradeoffs in camera production. In a camera test procedure, a junior test engineer always mixes many problems. We wish to provide a standard test procedure for camera products. In our paper we collected, integrated, and improved many test methods to make a suitable test methodology for digital camera industry.1 Introduction 9 2 Set-up Test Environment System 11 2.1 The Test Steps ………………………………………………….. 12 2.2 Least Squares Approximation ………………………………… 14 2.2.1 Algorithm for Least Square Plane Fitting ………………. 19 2.2.2 Algorithm for Least Square Sphere Fitting …………….. 20 2.2.3 Performance Analysis of Algorithms 2.2.1 and 2.2.2 …… 22 2.3 Fiducial Mark Search (FMS) Technology ……………………. 24 2.4 Environment …………………………………………………… 25 2.5 Test Pattern …………………………………………………….. 28 2.6 Other Environment Test ………………………………………. 29 3 Optical Quality Test System 31 3.1 Rotation ………………………………………………………… 33 3.1.1 Rotation on z-axis …………………………………………. 35 3.1.2 Skew ………………………………………………………... 37 3.2 Principal Point of Lens on Image Plane ……………………… 38 3.2.1 Using Parallel Lines ………………………………………. 39 3.2.2 Use lens shading center …………………………………… 41 3.3 Lens Distortion ………………………………………………… 43 3.3.1 Using Hough Transform ………………………………….. 45 3.4 Lens Resolution ………………………………………………… 47 3.4.1 Using “ISO Resolution Chart for Electronic Still Camera” 48 3.5 Lens Shading …………………………………………………… 50 3.6 Camera Calibration ……………………………………………. 57 4 Image Quality Test System 58 4.1 Dead/Stuck Pixels Compensation …………………………….. 60 4.2 Noise ……………………………………………………………. 63 4.3 Brightness Test (ISO Speed) …………………………………... 67 4.4 Gamma …………………………………………………………. 69 4.5 Color Test …………………………………………………….… 71 5 Conclusion 72 5.1 Judgment ………………………………………………………. 73 5.2 The Improvement and Integration in test pattern ………….. 74 5.2.1 Environment Improvement ……………………………… 75 5.3 Future Work …………………………………………………… 76en-US鏡頭校正數位相機生產研發檢測Lens Shading CalibrationCamera Testthesis