Method and device for testing dynamic range of camera by utilizing closed LED (light emitting diode) light source lamp box

Abstract

The invention relates to a method and a device for testing a dynamic range of a camera by utilizing a closed LED (light emitting diode) light source lamp box, and belongs to the field of testing. The method comprises the following steps of partitioning a closed box into two adjacent mutually independent first/second testing spaces; arranging a front plate with a camera testing hole in the front part of each testing space; respectively arranging an LED light source in the two testing spaces; respectively arranging a transparent testing card between each LED light source and each front plate; arranging movable sliding rails with movable sliding blocks in the longitudinal directions of the two testing spaces; arranging the LED light sources on the movable sliding blocks; connecting control ends of the LED light sources, control ends of the movable sliding rails and an image output end of camera lens to be tested with I/O ports of a control computer. According to the method and the device for testing the dynamic range of the camera by utilizing the closed LED light source lamp box, which are disclosed by the invention, an closed testing light source environment isolated from the outside is provided, the two light sources are completely independent without any crosstalk, and the configuration of optical parameters of the LED light sources and the adjustment of the distances and the positions of the LED light sources and a device to be tested are controlled by the computer, so that the whole testing device is convenient to operate, and the measurement accuracy is largely improved.

Description

technical field [0001] The invention belongs to the field of optical testing, in particular to a testing method and device for measuring the dynamic range of a camera imager. Background technique [0002] When high-brightness areas illuminated by strong light sources (sunlight, lamps, or reflections, etc.) and relatively low-brightness areas such as shadows and backlights exist in the image at the same time, the image output by the camera will appear bright areas that become white due to overexposure. However, dark areas become black due to underexposure, seriously affecting image quality. [0003] The performance of the camera in the brightest area and the darker area in the same scene is limited. This limitation is commonly referred to as "dynamic range". [0004] It can be seen that the "dynamic range" of the camera refers to the camera's ability to adapt to the light reflection of the scene in the shooting scene, specifically refers to the range of brightness (contrast)...

AI Technical Summary

Problems solved by technology

[0009] 1. The entire test environment must be carried out in a dark room;

[0010] 2. Because there is no isolation between the back projection light source used for the transmission test card and the illumination light source used for the reflection test card, mutual crosstalk will affect the test accuracy; if the brightness output of the rear projection light source and the illumination light source are greatly increased, this The mutual crosstalk between the two light sources will be more serious;

[0011] 3. The setting of each light source parameter and the setting of the light source position adopts manual mode, and the test accuracy and consistency of the test results cannot be well guaranteed;

[0012] 4. The existing light sources usually use high-power incandescent lamps or other lamps, which have high power consumption, poor reliability, and poor consistency of optical parameters such as chromaticity and brightness of the light source.

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