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Method for increasing CCD image collection system frame rate

A technology of image acquisition and system frame, which is applied in the parts of TV system, scanning details of TV system, image communication, etc. It can solve the problems of reduced tracking accuracy, inability to track fast-moving targets, and target loss, etc.

Inactive Publication Date: 2006-02-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the military, it is sometimes required to track a fast-moving target. If the image acquisition rate is not enough, the target will escape from the field of view before the image acquisition is completed, resulting in the loss of the target. In this way, the fast-moving target cannot be tracked. This puts forward higher requirements on the acquisition speed of the image acquisition system
For the above-mentioned target tracking system, not only the image acquisition system is required to have a higher acquisition speed, but also a larger field of view (if the field of view is too small, it is difficult to capture the target) and a higher resolution (resolution If the rate is low, the tracking accuracy will decrease) and more indicators
Therefore, adopting the common working mode cannot meet the above-mentioned needs of continuously and rapidly transmitting image information.

Method used

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  • Method for increasing CCD image collection system frame rate
  • Method for increasing CCD image collection system frame rate
  • Method for increasing CCD image collection system frame rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-T

[0075] Embodiment 1-TC237B frame transfer CCD

[0076] see first Figure 4 with Image 6 , Figure 4 It is the structure diagram of TC237B CCD, Image 6 It is a schematic diagram of the position of the sub-window in the present invention.

[0077] Before introducing the specific implementation of the "sub-window working mode", let me explain some terms used in the present invention:

[0078] The "position" is the coordinates of the sub-window 1109 relative to the reference point on the photosensitive surface of the CCD. For example, take the pixel at the lower left corner of the imaging area 11 as the reference point, that is, the coordinate origin 1108 . The point representing the position of the window is the point at the lower left corner of the window, which is called the "head pixel" 115 . In this way, the position of the sub-window 1109 can be represented by the coordinate value of the first pixel 115 of the sub-window relative to the coordinate origin 1108 . Ther...

Embodiment 2

[0095] Example 2 - Alternate Column Transfer CCD

[0096] The present invention improves the method for frame rate of CCD image acquisition system, comprises the following steps for every column transfer type CCD:

[0097] ① The user sets a sub-window whose first pixel coordinates are (i, j) and whose size is m rows×n columns in the imaging bar of M rows×N columns through commands;

[0098] ② The CCD is applied to the CCD by the CCD driver with the following sequence of driving pulses:

[0099] Q 2 → Z 2 →(jX 2 )→m[X 2 →(i+n)D 2 ]→(M-j-m)X 2 , the CCD will output a frame of the image of the sub-window, wherein:

[0100] Q 2 The clearing pulse is a pulse applied to the clearing pin of the alternate column transfer type CCD, so that the CCD imaging strip is cleared. After clearing, the exposure strip of the CCD is automatically exposed to generate charges corresponding to the scene;

[0101] Z 2 It is the frame shifting pulse of the column transfer type CCD, Z 2 A com...

Embodiment 3

[0105] Embodiment 3-full frame type CCD

[0106] The present invention improves the method for CCD image acquisition system frame rate, comprises the following steps for full-frame type CCD this method:

[0107] ① Set a sub-window whose head pixel coordinates are (i, j) and whose size is m rows×n columns in the imaging area of ​​M rows×N columns by command;

[0108] ② The CCD is applied to the CCD by the CCD driver with the following sequence of driving pulses:

[0109] Q 3 →(jX 3 )→m[X 3 →(i+n)D 3 ], the CCD will output the image of a frame of the sub-window, wherein:

[0110] Q 3 It is a full-frame CCD clearing pulse, so that the CCD imaging area is cleared, the exposure area of ​​the CCD starts to be exposed, and the exposure area generates charges corresponding to the scene;

[0111] x 3 It is a full-frame type CCD line translation pulse, X 3 Represents the combined pulse of an imaging pulse applied to the imaging area pin of the CCD and a serial pulse of the seri...

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Abstract

The invention relates to a method for improving the frame rate of CCD image collecting system. The invention sets the interested region of CCD imaging region as the sub-window according to the need of user, which comprises the first pixel coordinate (I, j) and the its size (m rows X n lines); the invention drives the CCD operate in the sub-window operational mode as only outputting the pixels of said sub-window from the CCD while the pixels outside the sub-window are distinguished inside the CCD chip. So the processing time of each frame image is reduced, and the frame rate is improved. In addition, since the size and the position coordinate of said interested region can be adjusted freely according to the need of user, the adaptability of CCD image collecting device is increased.

Description

technical field [0001] The invention relates to CCD image acquisition, in particular to a method for increasing the frame rate of a CCD image acquisition system. Background technique [0002] According to the internal structure of the area array CCD, it can be divided into three types: frame transfer CCD, interline transfer CCD and full frame CCD. In a common CCD image acquisition device, the CCD image sensor chips in it all work in the normal working mode. For the above three different types of CCD chips, the specific working process of their common working mode is described as follows: [0003] (1) frame transfer type (frame transfer) CCD, its structure is as follows figure 1 As shown, the moving direction of the induced charge is shown by the arrow, 101 is the imaging area (M rows × N columns), 102 is the storage area (M rows × N columns), 103 is the serial shift register, 104 is the output sensor, 105 It's clearing the gutter. [0004] In normal working mode, the pul...

Claims

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Application Information

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IPC IPC(8): H04N3/15H01L27/148H04N5/335H04N5/341
Inventor 秦世博董作人叶青韩泽华方祖捷瞿荣辉
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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