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Method and device for obtaining image based on dynamic time delay integral

A technology of image acquisition and delay integration, which is used in image communication, parts of color TV, parts of TV system, etc.

Inactive Publication Date: 2010-01-27
NANJING UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] The problem to be solved by the present invention is: how to obtain undistorted scene images without Blooming and higher SNR

Method used

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  • Method and device for obtaining image based on dynamic time delay integral
  • Method and device for obtaining image based on dynamic time delay integral
  • Method and device for obtaining image based on dynamic time delay integral

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Embodiment

[0037] Taking satellite shooting as an example, since the radiation of most ground scenes may be relatively weak, the integration time of CCD / CMOS sensor is much shorter than that of TDI-CCD, so the captured image is very dark and cannot display the details of the scene; while TDI - Due to the long integration time of the CCD, for some scenes with strong radiation, it will cause blooming phenomenon in the captured image, such as Figure 5 As shown, the quality of the image is seriously affected and cannot be recovered by image processing techniques. Utilize the inventive method, can draw the image of the output of not Blooming by controlling the integration time of TDI-CCD; Under the time control of the inventive method, these can take place the image row of the point place of Blooming and be in TDI-CCD at the same time All the images on the screen will be read out before Blooming, that is, the actual integration time is shorter than the TDI-CCD integration time T, so at this ...

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Abstract

The invention relates to a method and a device for obtaining an image based on the dynamic time delay integral. A CCD / CMOS photosensitive element and a TDI-CCD form an image obtainer, the integral time of TDI-CCD is controlled by analyzing an image read by the CCD / CMOS photosensitive element, and the image is read out before the image does not perform Blooming, finally the image is processed to obtain a scene image. In the invention, the integral time of the TDI-CCD is controlled according to the practical situation of the scene image, and the image is read out before the image does not perform Blooming so that the image quality loss is prevented, the integral time of the TDI-CCD is ensured in maximum, the advantage of long integral time of the TDI-CCD is greatly reserved, and the obtained image and the light intensity of a scene are a direct proportion relationship; therefore, the method and the device can prevent the image from generating Blooming phenomenon, ensure the image not to be distorted, and improve the signal-to-noise ratio of the image.

Description

technical field [0001] The invention belongs to the technical field of image acquisition, and relates to a time-delayed integration TDI (Time-Delayed Integration) technology, on which a dynamic time-delayed integration DTDI (Dynamic Time-Delayed Integration) technology is proposed, which is a dynamic time-delayed integration-based Image acquisition method and device. Background technique [0002] TDI-CCD (Time-Delayed Integration CCD), that is, time-delayed integration CCD, is a new type of photoelectric sensor developed in recent years, mainly used in remote sensing cameras. TDI (Time-Delayed Integration) technology utilizes the technique of increasing the integration time of CCD by matching the speed of scanning the scene with the charge transport speed in TDI-CCD. Applying TDI technology to CCD forms TDI-CCD, which is mainly used in the case of relatively fast relative movement between the scene and the camera, and has the advantages of high signal-to-noise ratio and wid...

Claims

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Application Information

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IPC IPC(8): H04N3/15H04N5/335
Inventor 闫锋李想
Owner NANJING UNIV
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