CN104217407A - Pseudo-color conversion method for uncooled infrared focal plane detector - Google Patents
Pseudo-color conversion method for uncooled infrared focal plane detector Download PDFInfo
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Abstract
The invention discloses a pseudo-color conversion method for an uncooled infrared focal plane detector. The pseudo-color conversion method comprises a density slicing method, a spacing domain gray-color conversion method and a frequency domain pseudo-color enhancing method. The density slicing method comprises slicing the luminance range of an image, appointing a kind of color to each area, and thereby changing the gray image to be a pseudo-color image. The spacing domain gray-color conversion method includes, according to the principle of colorimetry, sectionally performing red, green and blue conversion on the gray of the original image to change into three primary color components, respectively using the three primary color components for controlling red, green and blue electronic guns of a color display, and thereby composing a color image in the screen of the color display. The pseudo-color conversion method provided by the invention adopts multiple kinds of pseudo-color conversion methods, and can effectively perform pseudo-color conversion on the image and display tiny gray difference that cannot be distinguished by human eyes to be obvious color difference, thus being more convenient to interpret and extract useful information.
Description
Technical field
The present invention relates to a kind of non-refrigerated infrared focal plane probe pseudo-color conversion method.
Background technology
The main cause of image being carried out to virtual color display is that the resolution characteristic of people to gradation of image is lower, tens grades can only be told, and it is very strong to the resolving ability of color, thousands of kinds of colors can be told, in order to more effectively extract graphical information, virtual color display is that each different grey-scale of black white image is transformed into different colours according to linear or nonlinear mapping function, obtains the technology of a width coloured image, this technology makes original image details more easily recognize, target more easily identifies.
Pseudo color processing techniqus, although the object of process is gray level image, but the result generated is coloured image, as everyone knows, the vision system of people is very responsive to color, the gray level that human eye generally can be distinguished only has more than 20 individual, but can distinguish the colour of several thousand kinds of color people of different brightness, colourity and saturation degree.According to this feature of people, colour can be used in enhancing, to improve the identifiability of image.Therefore, if a width gray level image can be become coloured image, the visual effect strengthening image just can be reached.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of pseudo-color conversion method is provided, the method adopts multiple pseudo-color conversion method, effectively can carry out pseudo-color conversion to image, undistinguishable for human eye small gray scale difference is shown as obvious heterochromia, be more convenient for decipher and extraction useful information.
The object of the invention is to be achieved through the following technical solutions: non-refrigerated infrared focal plane probe pseudo-color conversion method, it comprises density slice, spatial domain gray-scale-color transform and frequency field virtual color display;
Wherein, described density slice splits brightness of image scope, makes certain brightness separation correspond to the thing of a certain class or the thing of a few class, thus be conducive to enhancing and the classification of image, and be that a kind of colour is specified in each interval, thus gray level image become a width pseudo color image;
Described spatial domain gray-scale-color transform is according to colorimetry principle, by the gray scale segmentation of original image through the conversion of red, green, blue three kinds difference, become three primary colours component, then remove with them the red, green, blue electron gun controlling color monitor respectively, just can synthesize a width coloured image on the screen of color monitor;
Described frequency field virtual color display first black white image through Fourier transform to frequency field, in frequency field, the wave filter of three different transmission characteristics is separated into three isolated components, then inverse Fourier transform is carried out to them, just the monochrome image that three width represent different frequency component is obtained, then histogram equalization is carried out to this three width image, finally they are added to respectively the red, green, blue display channel of color monitor as three primary colours component, thus realize the virtual color display of frequency field segmentation.
The invention has the beneficial effects as follows: pseudo-color conversion method of the present invention adopts multiple pseudo-color conversion method, effectively can carry out pseudo-color conversion to image, undistinguishable for human eye small gray scale difference is shown as obvious heterochromia, be more convenient for decipher and extraction useful information.
Accompanying drawing explanation
Fig. 1 is pseudo-color conversion method block diagram;
Fig. 2 is density slice space schematic diagram;
Fig. 3 is density slice floor map;
Fig. 4 is typical spatial domain gray-scale-color transform function;
Fig. 5 is red, green, blue three kinds of transforming function transformation functions and mutual relationship figure;
Fig. 6 is frequency field virtual color display block diagram.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
As shown in Figure 1, non-refrigerated infrared focal plane probe pseudo-color conversion method, it comprises density slice method, spatial domain gray-scale-color transform and frequency field virtual color display;
Described density slice splits brightness of image scope, certain brightness separation is made to correspond to the thing of a certain class or the thing of a few class, thus be conducive to enhancing and the classification of image, and be that a kind of colour is specified in each interval, thus gray level image is become a width pseudo color image.As shown in Figures 2 and 3, density slice method is black from 0(for the gray level of black white image) be divided into N number of interval Li, i=1 to M0 (in vain), 2 ..., N.Specify a kind of colored Ci to each interval Li, like this, just a width gray level image can be become a width pseudo color image, this method is relatively more directly perceived simple.
Described spatial domain gray-scale-color transform is according to colorimetry principle, by the gray scale segmentation of original image through the conversion of red, green, blue three kinds difference, become three primary colours component, then remove with them the red, green, blue electron gun controlling color monitor respectively, just can synthesize a width coloured image on the screen of color monitor.The conversion process of spatial domain gray-scale-color transform as shown in Figure 4, typical transforming function transformation function as shown in Figure 5, wherein (a), (b), (c) are respectively red, green, blue three kinds of transforming function transformation functions, and scheme (d) three kinds of conversion are drawn in same coordinate axis to see mutual relation clearly.From figure (d), be only blue when gray scale is zero, in green when gray scale is L/2, takes on a red color when gray scale is L, when gray scale is other value, be mixed into different tones by by three primary colours.
As shown in Figure 6, described frequency field virtual color display first black white image through Fourier transform to frequency field, in frequency field, the wave filter of three different transmission characteristics is separated into three isolated components, then inverse Fourier transform is carried out to them, just the monochrome image that three width represent different frequency component is obtained, then this three width image is further processed, finally they are added to respectively the red, green, blue display channel of color monitor as three primary colours component, thus realize the virtual color display of frequency field segmentation.Described is further processed as histogram equalization.
Claims (1)
1. non-refrigerated infrared focal plane probe pseudo-color conversion method, is characterized in that: it comprises density slice, spatial domain gray-scale-color transform and frequency field virtual color display;
Wherein, described density slice splits brightness of image scope, makes certain brightness separation correspond to the thing of a certain class or the thing of a few class, thus be conducive to enhancing and the classification of image, and be that a kind of colour is specified in each interval, thus gray level image become a width pseudo color image;
Described spatial domain gray-scale-color transform is according to colorimetry principle, by the gray scale segmentation of original image through the conversion of red, green, blue three kinds difference, become three primary colours component, then remove with them the red, green, blue electron gun controlling color monitor respectively, just can synthesize a width coloured image on the screen of color monitor;
Described frequency field virtual color display first black white image through Fourier transform to frequency field, in frequency field, the wave filter of three different transmission characteristics is separated into three isolated components, then inverse Fourier transform is carried out to them, just the monochrome image that three width represent different frequency component is obtained, then histogram equalization is carried out to this three width image, finally they are added to respectively the red, green, blue display channel of color monitor as three primary colours component, thus realize the virtual color display of frequency field segmentation.
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| CN108537763A (en) * | 2017-03-01 | 2018-09-14 | 深圳开阳电子股份有限公司 | A kind of color of image means for correcting |
| CN109009216A (en) * | 2018-08-03 | 2018-12-18 | 杭州行开科技有限公司 | A kind of ultrasonic image naked eye 3D system |
| US10430932B2 (en) | 2016-09-15 | 2019-10-01 | Axis Ab | Method and an arrangement for pseudo coloring of a digital image |
| CN112419745A (en) * | 2020-10-20 | 2021-02-26 | 中电鸿信信息科技有限公司 | Highway group fog early warning system based on degree of depth fusion network |
| CN113160095A (en) * | 2021-05-25 | 2021-07-23 | 烟台艾睿光电科技有限公司 | Infrared detection signal pseudo-color processing method, device and system and storage medium |
| CN114339066A (en) * | 2020-09-30 | 2022-04-12 | 上海中兴软件有限责任公司 | Image processing method, device, terminal and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10430932B2 (en) | 2016-09-15 | 2019-10-01 | Axis Ab | Method and an arrangement for pseudo coloring of a digital image |
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| CN114339066A (en) * | 2020-09-30 | 2022-04-12 | 上海中兴软件有限责任公司 | Image processing method, device, terminal and medium |
| CN112419745A (en) * | 2020-10-20 | 2021-02-26 | 中电鸿信信息科技有限公司 | Highway group fog early warning system based on degree of depth fusion network |
| CN113160095A (en) * | 2021-05-25 | 2021-07-23 | 烟台艾睿光电科技有限公司 | Infrared detection signal pseudo-color processing method, device and system and storage medium |
| CN113160095B (en) * | 2021-05-25 | 2023-05-19 | 烟台艾睿光电科技有限公司 | Infrared detection signal pseudo-color processing method, device, system and storage medium |
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