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Preset level raised sine wave frequency code imaging system of CCD camera

A technology of preset level and imaging system, which is applied to the parts of TV system, TV, electrical components, etc., can solve the problems affecting the overall signal-to-noise ratio of the image, and the low signal-to-noise ratio of digital signals, so as to improve the signal-to-noise ratio , low device and process requirements, and high reliability

Inactive Publication Date: 2017-05-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, when a pure sine wave is used as the excitation signal, the signal-to-noise ratio of the digital signal obtained in the low-level part of the sine wave is very low, thus affecting the overall signal-to-noise ratio of the image

Method used

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  • Preset level raised sine wave frequency code imaging system of CCD camera
  • Preset level raised sine wave frequency code imaging system of CCD camera
  • Preset level raised sine wave frequency code imaging system of CCD camera

Examples

Experimental program
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Embodiment 1

[0027] A kind of CCD camera raises preset level sine wave frequency coded imaging system, see figure 1 , figure 2 and image 3 , the imaging system includes: a group of n×n monochromatic light sources 1 (denoted by LD) and a CCD camera 3, n≥3 and an odd number (n is an odd number, then the most middle light source or photosensitive device can be used as the centerline , to facilitate alignment and arrangement, wherein, the specific value of n is related to the cross-sectional area of ​​the sample 2, which is not limited in the embodiment of the present invention). That is, on one side of the sample 2, a group of n×n monochromatic light sources 1 with preset wavelengths are uniformly distributed, and a CCD camera 3 is arranged on the axis of the monochromatic light source 1 on the opposite side, and the monochromatic light source 1 and the CCD camera 3 are focused on The surface of sample 2.

[0028] Wherein, preferably, the monochromatic light source 1 is uniformly distrib...

Embodiment 2

[0039] A kind of CCD camera raises preset level sine wave frequency coded imaging system, see figure 1 and figure 2 , this embodiment is described by taking a laser diode as the monochromatic light source 1 as an example.

[0040] Each laser diode LD in a group of monochromatic light sources 1 is respectively driven by using different frequencies to raise the preset level sine wave ij , each pixel lm in the CCD camera 3 receives the monochromatic light combination I that each laser diode in the monochromatic light source 1 passes through the sample 2 lm , the combination of monochromatic light by computer I lm Each laser diode LD can be obtained by performing demodulation and separation ij Combination of monochromatic light I lm The contribution of , from which sample 2 can be imaged.

[0041] In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions.

[0042] In s...

Embodiment 3

[0044] A kind of CCD camera raises preset level sine wave frequency coded imaging system, see figure 1 and figure 2, this embodiment is described by taking a monochromatic diode as the monochromatic light source 1 as an example.

[0045] Each monochromatic diode LD in a group of monochromatic light sources 1 is respectively driven by using different frequencies to raise the preset level sine wave ij , each pixel lm in the CCD camera 3 receives the monochromatic light combination I of each monochromatic diode in the monochromatic light source 1 and passes through the sample 2 lm , the combination of monochromatic light by computer I lm Demodulation and separation can obtain each monochromatic diode LD ij Combination of monochromatic light I lm The contribution of , from which sample 2 can be imaged.

[0046] In the embodiments of the present invention, unless otherwise specified, the models of the devices are not limited, as long as they can complete the above functions. ...

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Abstract

The present invention discloses a preset level raised sine wave frequency code imaging system of a CCD camera. According to the imaging system, different frequencies of preset level raised sine wave are each used to drive a single-color light source LDij in a group of single-color light sources, and each pixel in the CCD camera receives a single-color light combination penetrating a sample of each light source in the single-color light sources; when the CCD camera collects images, a noise level is maintained, but the preset level of a sine wave signal as a drive is raised, so that in a low level part of the sine wave signal, the sine wave signal is improved remarkably compared with noise, therefore, the signal-to-noise ratio of acquiring the image by the CCD camera is improved in the low level section of the sine wave signal, and the single-color light combination input into the computer is more accurate; and the computer demodulates and separates the single-color light combination so as to obtain contribution of each single-color light source to the single-color light combination, so that the sample is imaged.

Description

technical field [0001] The invention relates to the field of imaging systems, in particular to a sine wave frequency coded imaging system for raising a preset level of a CCD camera. Background technique [0002] In the prior art, imaging the interior of an object, especially the interior of the human body, has the outstanding advantages of being non-destructive, non-invasive, and radiation-free through light. However, there is no imaging optical system that can be used clinically. The system has low precision and small amount of information, which cannot meet the needs of practical applications. [0003] In order to improve the quality of image measurement, the patent application in the prior art with the announcement number of CN 104807824A and the announcement date of July 29, 2015 uses sine waves as excitation signals to improve the imaging quality. [0004] In the process of realizing the present invention, the inventor finds that at least the following disadvantages an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225
CPCH04N23/56H04N23/54H04N23/55
Inventor 林凌张启蕊李刚
Owner TIANJIN UNIV