Method for testing dark current noise of camera module
A camera module, dark current noise technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of inability to evaluate the dark current consistency of camera modules, low cost, etc., and achieve cost performance High, low noise effect
Inactive Publication Date: 2012-10-24
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology
The dark current test of the camera module requires high-precision precision instruments, equipment and environment, and there is no simple, low-cost and easy method or such a method has been made public.
This makes us limited to the calculation estimates given by the camera module factory for obtaining the parameters of the dark current of the camera module, and also makes it impossible for us to evaluate the consistency of the dark current of the camera module
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[0021] Such as figure 1 As shown, in a preferred embodiment of the present invention, a smart application is used for testing, and its working principle is: by taking photos in a dark environment, each pixel of the camera is in the same level of brightness environment. At this time, the difference in the brightness value induced by each pixel can reflect the noise effect caused by the dark current of the camera module. By calculating the number of severely noisy pixels and the proportion of the total number of pixels to obtain the average noise rate, the cameras can be compared and rated quantitatively, and the module with the lowest dark current noise can be selected. The steps of the procedure are as follows: (the following positive integer pixel count count i=1~M, M is the number of all pixels of the camera module to be tested)
[0022] Step 301: Take a photo in a dark environment with the camera to be evaluated;
[0023] Step 302: Perform RAW output according to the current p...
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The invention relates to a method for testing the dark current noise of a camera module, comprising the following steps of: shooting a photograph by the camera module to be tested in the dark environment; carrying out RAW output on the photograph, so that a luminance value Ai of each pixel point can be obtained, wherein i=1-M, and M is the number of all the pixels of the camera module; computing a luminance mean value B of all the pixel points of the whole camera module, and computing difference value absolute values Ci, wherein Ci= / Ai-B / ; comparing the difference value absolute values with a normalized value D one by one, and if one of the difference value absolute values is larger than D, and computing by adding 1 to the noise times Nt at the time, wherein the original value of the Nt is 0; computing the noise point ratio Ht at the time, and repeating S times to obtain S noise point ratios t=1-S; and outputting a mean noise point ratio h.
Description
Technical field [0001] The invention relates to a mobile phone and remote wireless control, in particular to a method for testing dark current noise of a camera module, and is particularly applied to a smart phone and a controlled computer. Background technique [0002] Currently, camera modules are increasingly used in mobile phones, handheld computers and notebook computers. The dark current test of the camera module requires high-precision precision instruments, equipment, and environment. There is no simple, low-cost and easy method or such a method has been published. This makes the parameters for obtaining the dark current of the camera module limited to the calculated estimates given by the camera module manufacturer, and also prevents us from evaluating the consistency of the dark current of the camera module. Summary of the invention [0003] The technical problem to be solved by the present invention is how to provide a method for testing dark current noise of a camera ...
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IPC IPC(8): H04N17/00H04N5/361
Inventor 曾元清
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD