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Method of compensating image quality during high-temperature object measurement

A technology of high-temperature objects and compensation methods, applied in image enhancement, measuring devices, image communication, etc.

Active Publication Date: 2015-07-01
DALIAN UNIV OF TECH
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Problems solved by technology

However, for objects with time-varying temperature, it is impossible to effectively obtain images of high-temperature objects with stable resolution

Method used

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  • Method of compensating image quality during high-temperature object measurement
  • Method of compensating image quality during high-temperature object measurement
  • Method of compensating image quality during high-temperature object measurement

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specific Embodiment approach

[0038] This example uses figure 1 When the high-temperature object measurement system shown in the figure captures the image of the high-temperature object, it can be known from the formula (4) of the radiation illuminance of the high-temperature object itself that the radiation illuminance of the high-temperature object itself will change at different temperatures, and the change trend is as follows figure 2 As shown, as the temperature of the high-temperature object increases, its irradiance increases sharply, which is also the reason why the image quality of the high-temperature object taken at different temperatures is difficult to guarantee.

[0039] Taking high-temperature samples at 800°C to 1250°C under certain working conditions as an example, it can be deduced from the formula (3) that the image quality decreases with the increase of temperature, especially when the temperature is higher than 1100°C, the image quality drops significantly ,See Figure 4. Among them...

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Abstract

The invention belongs to the field of high temperature object measurement, in particular to a method of compensating image quality during high-temperature object measurement. The compensating method comprises the steps of illuminating the surface of a to-be-detected high temperature object by using an adjustable light intensity laser, and realizing effectively filtrating the radiant strong light of a plurality of high temperature objects after laser reflected by the surfaces of the high-temperature objects and radiant strong light of the high temperature objects are filtrated by an optical filter; making the camera image by the radiant strong light of the rest of parts of high temperature objects and the high temperature objects. The output light intensity output by a laser device can be adjusted in real time so that the laser device is matched with the changing tendency of the light intensity of the radiant light according to the light intensity changing tendency if radiant light in a filter piece pass-band at different temperatures, and the clear images of characteristic light bars of the high temperature objects can be realized in a large temperature gradient; furthermore, the compensation parameters of an assistant laser device can be adjusted in real time by a built compensation model, and the real-time correction of the image quality of the high temperature objects can be realized, so as to realize clearly acquiring the high temperature images at different temperatures.

Description

technical field [0001] The invention belongs to the field of high-temperature object measurement, in particular to a method for real-time compensation of image quality when visually measuring high-temperature objects. Background technique [0002] In some industrial production or experiments, it is necessary to observe the characteristic dimensions of high-temperature objects in real time. Because the machine vision method has the advantages of non-contact and high measurement accuracy, it is widely used in on-line measurement in industrial sites. However, when measuring high-temperature objects, affected by the strong radiation of high-temperature objects, the collected images can only distinguish the rough outline of the object, and cannot obtain images of high-temperature objects with clear feature boundaries, which seriously affects the accurate measurement of the characteristic dimensions of high-temperature objects. [0003] The United States patent (Patent No: US 6859...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G06T5/00H04N5/235
Inventor 贾振元刘巍刘阳王灵丽杨景豪樊超楠
Owner DALIAN UNIV OF TECH
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