Research And Application Of Camera Module Resolution And Blemish Testing

Camera module as an input video device has small size, low cost, higher image quality and many other features is widely used in smart phones, computers, surveillance, automotive, iris and other electronic equipment. Currently the image sensor is basically CMOS, so the camera module also known as CCM(CMOS Camera Module). In the camera module evaluation system, resolution and blemish are very important test items. At present, most domestic manufacturers using manual detection method, this method has obvious drawbacks: the inspectors themselves by operator and production environment impact, high misjudgment rate and the test results consistency is poor, so can't guarantee product quality, so the development of a fast, reliable method to replace manual inspection is an urgent need.In this paper, combined with the actual production needs, from the test machine's design, the test Chart diagram design, teleconverter selection, the test board selected, CTF function, and ROI areas selected, build a suitable production line focusing system; On blemish test, proposes a binary image, gray stretch, fast calculation Kernel Mean values and improved vector labeling method such as a combination of fast blemish method to three types which are detect obvious, smaller obvious and difficult detection by eyes of dirt automatic detection and identification. This test system visualization software testing and test data can be traced back and easy manual operation, greatly improving production efficiency and yield.The main agendas as follows:1. Describes the background and the innovation of this subject;2. Describes the theoretical study of the test camera module, contains two parts: one camera module imaging optical principle introduced; the second is to study the general camera module test methods;3. Describes the resolution and blemishes theory of camera module testing, contains two parts: First, study the resolution of the algorithm; the second is to study the blemish detection algorithm;4. Describes the test system consists of three parts: First, the hardware implementation of the test system, introduced test machine design, Chart diagram design, teleconverter and light source selection and testing board; Second, the test software platform and algorithm, introduced software development platform and multi-threaded applications, introduces the resolving power test algorithm based CTF implementation and dirt detection algorithm; Third, analysis and practical application of test data;...