A Fast Focusing Method for Outdoor Scene Imaging of Remote Sensing Camera
A remote sensing camera and location technology, applied in image communication, photographic devices, color TV components, etc., can solve problems such as difficult to guarantee accuracy and speed, tedious and time-consuming implementation, and great subjective influence of human participation, etc., to achieve strong real-time performance , avoid tediousness and subjectivity, overcome the effect of dependence
Inactive Publication Date: 2017-06-09
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0005] In order to solve the technical problems of the existing remote sensing camera focusing methods for ground-based outdoor imaging experiments, which are cumbersome and time-consuming to implement, the subjective influence of human participation is large, and the accuracy and speed of frequent adjustments to the focal plane are difficult to guarantee. A simple and efficient TDICCD camera focusing method that can meet the needs of frequent adjustments in remote sensing camera ground exterior imaging experiments
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[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0028] An experimental system equipment used in a fast focusing method for external scene imaging of a remote sensing camera includes: a remote sensing camera, an imaging turntable, a temperature sensor, and an image acquisition and processing system. The remote sensing camera includes the optical machine body of the camera, TDICCD and imaging circuit, camera controller, and focusing mechanism components. The remote sensing camera is placed on the imaging turntable, and the remote sensing camera realizes push-broom imaging during the rotation of the turntable. The image acquisition and processing system completes the real-time acquisition and storage of remote sensing camera images.
[0029] The specific steps of the present invention's fast focusing method for remote sensing camera exterior imaging are as follows: figure 1 Shown:
[0030] Step 1. Obtain t...
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A fast focusing method for remote sensing camera exterior imaging belongs to the field of photoelectric detection imaging. In order to solve the problems of long time consumption, large subjective influence, and difficulty in ensuring accuracy and speed in the existing technology, the method includes: 1. Obtaining normalized focus Evaluation function curve Q; 2. Real-time acquisition and storage of a frame of exterior images; 3. Measurement of the temperature of key components of the camera; 4. Judgment of the defocus direction; 5. Calculation of the normalized focus evaluation value z of the image; 6. Judgment of the z value, such as If z=1, execute step 9, if z<1, execute step 7; 7. Compare the z value with the normalized focus evaluation function curve Q in step 1 to obtain the degree of defocus; 8. The camera controller converts the value obtained in step 4 Combining the defocusing direction and the defocusing degree obtained in step 7, send the control signal of the focusing mechanism to adjust the movement of the focusing mechanism; repeat steps 2-6 until the normalized focus evaluation value z=1 of the captured image, and the focusing is completed ;9. When the focusing is finished, perform step 2 again.
Description
technical field [0001] The invention relates to a fast focusing method for remote sensing camera exterior scene imaging, which belongs to the field of photoelectric detection imaging. Background technique [0002] As an important detection device for space remote sensors, space remote sensing cameras have experienced development from short focal length and low resolution to long focal length and high resolution. With the higher and higher requirements for the resolution of space remote sensing cameras, TDICCDs are generally used as detectors in the field of remote sensing at home and abroad. TDICCD can greatly improve the sensitivity and signal-to-noise ratio of the imaging system by accumulating multiple time delays of the same target. However, TDICCD can only image clearly when the scanning speed of the camera relative to the imaging target is strictly matched with the image movement speed. Therefore, its working principle determines that the image captured by the TDICCD ...
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IPC IPC(8): H04N5/232G01C11/02
Inventor 陶淑苹曲宏松贺小军
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI