Scanning pen fill light and scanning pen

Abstract

This application belongs to the field of optical technology, and particularly relates to a scanning pen fill light and the scanning pen thereof. The scanning pen fill light's emission spectrum includes a green main peak with a wavelength of 500-560 nm. The scanning pen fill light provided by this application has a green main peak in its emission spectrum with a wavelength of 500-560 nm. Under illumination from the green main peak in the 500-560 nm band, the reflectivity of cyan and yellow inks in printed materials is high and significantly different. This results in a large difference in the reflection intensity of cyan ink received by the camera compared to that of yellow ink, thereby effectively identifying and distinguishing the printing information corresponding to cyan and yellow inks in printed materials, improving the scanning pen's recognition rate.

Description

Technical Field

[0001] This application belongs to the field of optical technology, and in particular relates to a scanning pen fill light and the scanning pen thereof. Background Technology

[0002] With the effective integration of educational resources and internet technology, an increasing number of terminal devices possess functions such as Q&A, problem feedback, and intelligent question search. These devices use a scanning pen to scan and upload the question to the network, and then retrieve the corresponding question analysis from the network and present it to the user. A scanning pen is a handheld electronic device that scans and inputs text using a camera. During scanning, LEDs are typically designed to provide supplementary lighting for the camera's scanning range, ensuring that the camera can clearly capture the text image. To save costs and reduce computing power requirements, these products usually use a monochrome camera, paired with an LED that uses ordinary blue light to excite yellow phosphors to emit white light. The basic principle of scanning pen imaging is as follows: a light source emits light, which is reflected by the printed material and enters the scanning pen's camera. The camera sensor transmits the light intensity detected by each pixel, and different pixels form a grayscale image.

[0003] Because printed materials have a rich variety of colors, some color combinations that appear very different to the human eye may appear to have very similar gray levels in images captured by a black and white camera. This makes it difficult for the scanning pen to effectively recognize and distinguish the scanned content, resulting in a low scanning recognition rate. Summary of the Invention

[0004] The purpose of this application is to provide a scanning pen fill light and a scanning pen thereof, which aims to solve the problem of low recognition rate of existing scanning pens to a certain extent.

[0005] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a scanning pen fill light, wherein the emission spectrum of the scanning pen fill light includes a green main peak with a wavelength of 500-560nm.

[0007] Furthermore, the emission spectrum of the scanning pen's fill light also includes a red secondary peak with a wavelength of 620–680 nm.

[0008] Furthermore, the emission spectrum of the scanning pen's fill light also includes a blue secondary peak with a wavelength of 440–480 nm.

[0009] Furthermore, in the emission spectrum of the scanning pen's fill light, the ratio of the light intensity of the red secondary peak to the light intensity of the green primary peak is (0.1~0.4):1.

[0010] Furthermore, the ratio of the light intensity of the red secondary peak to that of the green primary peak is (0.2-0.3):1.

[0011] Furthermore, in the emission spectrum of the scanning pen's fill light, the light intensity of the blue secondary peak is 0.2 times lower than that of the green primary peak.

[0012] Furthermore, the ratio of the light intensity of the blue secondary peak to that of the green primary peak is (0.01 to 0.15):1.

[0013] In a first aspect, this application provides a scanning pen, which includes a camera and the aforementioned scanning pen fill light.

[0014] Furthermore, for printed materials that use any one of black, white, red, blue, green, cyan, red, and yellow as the font color and any one of red, green, blue, and black as the background color, the recognition rate of the scanning pen shall not be less than 90%.

[0015] Furthermore, for black and white printed materials, the recognition rate of the scanning pen is no less than 99%.

[0016] The scanning pen supplement light provided in the first aspect of this application has an emission spectrum that includes a green main wave peak with a wavelength of 500-560nm. Under the illumination of the green main wave peak in the 500-560nm band, the cyan ink and yellow ink in the printed matter have high reflectivity and a large difference. This results in a large difference between the reflection intensity of the cyan ink and the reflection intensity of the yellow ink received by the camera, thereby effectively identifying and distinguishing the printing information corresponding to the cyan ink and yellow ink in the printed matter, and improving the recognition rate of the scanning pen.

[0017] The scanning pen provided in the second aspect of this application includes a camera and the aforementioned scanning pen supplement light. The emission spectrum of the scanning pen supplement light includes at least a green main peak with a wavelength of 500-560nm, and may further include a red secondary peak with a wavelength of 620-680nm, and a blue secondary peak with a wavelength of 440-480nm. This effectively improves the reflectivity difference of different colored inks in printed materials, enabling the camera to receive different reflection intensities for different colored inks in printed materials, thus better identifying the printing information corresponding to different colored inks and significantly improving the recognition rate of the scanning pen. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1These are the reflectance data of the four CMYK inks and white paper substrate under different wavelengths of light provided in the embodiments of this application;

[0020] Figure 2 This is a spectrum diagram of the supplementary lamp in the scanning pen provided in Embodiment 1, Comparative Example 1, and Comparative Example 2 of this application, that is, a graph showing the relationship between the wavelength and intensity of light. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0024] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0026] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass in the embodiments of this application can be a well-known unit of mass in the chemical industry, such as μg, mg, g, or kg.

[0027] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0028] This application's embodiments are based on the CMYK four-primary-color printing technology principle, which utilizes four inks mixed and superimposed in different proportions to simulate various printing colors. Printing colors can be characterized using the following formula (I):

[0029] Color=a*C+b*M+c*Y+d*K formula (I)

[0030] In this system, C, M, Y, and K represent the four basic printing colors: C for cyan, M for magenta, Y for yellow, and K for black. The values ​​of a, b, c, and d range from 0 to 100%. Printing standards are typically divided into quinary and decimal systems. For quinary printed materials, a, b, c, and d are each multiple of 5%; for decimal printed materials, a, b, c, and d are each multiple of 10%. By adjusting the proportions of the four basic colors C, M, Y, and K in the printing ink, different colors can be achieved.

[0031] This application's embodiments reveal that the four color inks (C, M, Y, and K) have different reflectivities for different colors (i.e., different wavelengths) of light. The reflectivities of the four color inks (C, M, Y, and K) and the paper substrate at different wavelengths are shown in the attached figures. Figure 1As shown in the figure, under blue light source conditions with wavelengths of 440–485 nm, cyan ink has a high reflectivity, while magenta, yellow, and black inks have relatively low and similar reflectivities. Under red light source conditions with wavelengths of 625–740 nm, magenta and yellow inks have relatively similar reflectivities, while cyan and black inks have relatively similar reflectivities. Under green light source conditions with wavelengths of 500–565 nm, cyan and yellow inks have high reflectivities with significant differences, while red and black inks have relatively low and similar reflectivities. Furthermore, for mixed-spectrum light sources, i.e., light sources containing multiple wavelengths simultaneously, the reflected light intensity of different inks is the sum of the reflected light intensities of the light source at different wavelengths. (See attached figure.) Figure 1 It is known that for the same text and background composed of different colors, the intensity of light reflected by the text and background will differ under illumination from light sources of different spectra. Similarly, for a camera's light sensor, the grayscale information displayed in the captured image depends on the intensity of light entering the sensor. Therefore, when a camera captures the same text and background content under illumination from light sources of different spectra, the different intensities of light reflected by the text and background result in different intensities of light entering the sensor image, thus obtaining image information where the grayscale of the text image differs from that of the background image.

[0032] Furthermore, this application's embodiments reveal that when the reflectance of two colored inks is similar, according to formula (I), the two coefficients corresponding to the two colored inks in formulas a, b, c, and d, while keeping the sum of the two coefficients constant, will cause significant changes in the color of the printed inks if they vary arbitrarily within their range. However, under the same light source, the reflectance of the two colored inks is a fixed value. When the reflectance of the two colored inks is similar, a decrease in the coefficient of one colored ink and an increase in the coefficient of the other colored ink will not significantly change the superposition of the light source reflection intensity of the two colored inks, thus the grayscale information received by the camera sensor will not change significantly. Therefore, when the reflectance of the inks used for the text and background of a printed product is similar, even if the coefficients of the four colored inks C, M, Y, and K are adjusted to make the text and background appear as different colors with high visual recognition, when illuminated by the corresponding light source, because the emissivity of the text and background inks to the light source is similar, the light source reflection intensity received by the camera sensor will be similar. This will result in the text and background colors in the photograph captured by the camera being similar, making it impossible to recognize the text information in the image.

[0033] Based on this, the first aspect of the present application provides a scanning pen fill light, the emission spectrum of which includes a green main peak with a wavelength of 500-560nm.

[0034] The scanning pen supplementary light provided in the first aspect of this application has an emission spectrum including a green main peak with a wavelength of 500-560nm. This main peak refers to the peak with the highest luminous intensity in the emission spectrum. Under the illumination of the green main peak in the 500-560nm band, the cyan and yellow inks in the printed matter have high reflectivity and significant differences. This results in a large difference between the reflection intensity of the cyan ink and the reflection intensity of the yellow ink received by the camera, thereby effectively identifying and distinguishing the printing information corresponding to the cyan ink and yellow ink in the printed matter, and improving the recognition rate of the scanning pen.

[0035] In some embodiments, the emission spectrum of the scanning pen's supplementary light also includes a red secondary peak with a wavelength of 620–680 nm. In this embodiment, to distinguish the printing information corresponding to red ink and black ink, a red secondary peak with a wavelength of 620–680 nm is added to the supplementary light. Under red light illumination, red ink has a higher reflectivity, thereby increasing the light reflection intensity of the red ink and effectively identifying and distinguishing the printing information corresponding to red ink and black ink in printed materials. Through the synergistic effect of the green primary peak with a wavelength of 500–560 nm and the red secondary peak with a wavelength of 620–680 nm in the emission spectrum of the scanning pen's supplementary light, the scanning pen can effectively identify the printing information of different colored inks in printed materials, improving the scanning pen's recognition rate for printed materials of different colors.

[0036] In some embodiments, the emission spectrum of the scanning pen's supplementary light also includes a blue secondary peak with a wavelength of 440–480 nm. Under blue light illumination, cyan ink in printed materials has a higher reflectivity than inks of other colors. By adding a portion of blue light to the supplementary light, the scanning pen's camera can better identify cyan light sources in the printing, thereby enabling the scanning pen to more effectively identify printing information corresponding to different colors of ink in the printed material and improving the scanning pen's recognition rate.

[0037] In some embodiments, the intensity ratio of the red secondary peak to the green primary peak in the emission spectrum of the scanning pen's fill light is (0.1–0.4):1. (From the appendix...) Figure 1It is known that under green light illumination, the reflectivity of the four ink colors—cyan, red, yellow, and black—exhibits significant differences. Cyan and yellow inks have high reflectivity with a large difference between them, while red and black inks have lower reflectivity, although their reflectivity is relatively similar. To improve the reflectivity difference between red and black inks, a small amount of red light is added to the green light source to enhance this difference, thereby improving the camera's recognition rate of red and black ink information in printed materials. In this embodiment, the scanning pen's supplementary light primarily uses a green light source, supplemented by a red light source, enabling the scanning pen to efficiently identify and distinguish the four basic ink colors in printed materials, ensuring the scanning pen's recognition rate. If the intensity of the red light source is too low, it will hinder the improvement of the reflectivity difference between red and black ink, thus reducing the recognition rate of the scanning pen for red and black ink. If the intensity of the red light source is too high, the reflectivity of red and yellow ink is relatively close under red light illumination, and the reflectivity of cyan and black ink is relatively close, resulting in a low reflectivity. Therefore, the recognition rate of the scanning pen for cyan and black ink will be reduced, as will the recognition rate for red and yellow ink. In some specific embodiments, the ratio of the light intensity of the red light source to the green light source in the supplementary light lamp includes, but is not limited to, 0.1:1, 0.2:1, 0.3:1, 0.4:1, etc. In some preferred embodiments, the ratio of the light intensity of the red secondary peak to the green primary peak is (0.2~0.3):1.

[0038] In some embodiments, the light intensity of the blue secondary peak in the emission spectrum of the scanning pen's supplementary light is 0.2 times lower than that of the green primary peak. This application embodiment improves the scanning pen's recognition rate by adding a small amount of blue light to the supplementary light, enabling the scanning pen's camera to better identify cyan light in the printing. If the blue light intensity is too high, cyan ink has a high reflectivity under blue light illumination, but red, yellow, and black inks have low and similar reflectivities, thus reducing the scanning pen's efficiency in distinguishing between red, yellow, and black inks. In some specific embodiments, the ratio of the light intensity of the blue light to the light intensity of the green light in the supplementary light includes, but is not limited to, 0.01:1, 0.05:1, 0.1:1, 0.15:1, 0.18:1, and 0.19:1. In some preferred embodiments, the ratio of the light intensity of the blue light to the light intensity of the green light is (0.1–0.15):1.

[0039] In some specific embodiments, the scanning pen fill light includes a green primary peak with a wavelength of 500-560 nm, a red secondary peak with a wavelength of 620-680 nm, and a blue secondary peak with a wavelength of 440-480 nm; the ratio of the light intensity of the red secondary peak to that of the green primary peak is (0.1-0.4):1; the light intensity of the blue secondary peak is less than 0.2 times that of the green primary peak.

[0040] In some embodiments, the methods for preparing a scanning pen fill light including a green primary peak with a wavelength of 500–560 nm, a red secondary peak with a wavelength of 620–680 nm, and a blue secondary peak with a wavelength of 440–480 nm include, but are not limited to, the following:

[0041] Using RGB three-color LEDs, the brightness of the three color light sources is controlled separately, and the light source spectrum obtained by mixing the three LEDs exhibits the characteristics described above.

[0042] Alternatively, red and green LEDs can be used, and the brightness of the two LEDs can be adjusted so that the spectrum of the mixed light exhibits the characteristics described above. In some specific embodiments, the green sub-light source, the red sub-light source, and the blue sub-light source are assembled into a supplementary light.

[0043] Alternatively, LEDs meeting the above requirements can be directly fabricated through material processing, for example, by exciting RGB phosphors mixed in a certain proportion with ultraviolet light to generate a light source that meets the characteristics described above. In some specific embodiments, phosphors with excitation wavelengths of 500–560 nm, 620–680 nm, and 440–480 nm, along with an excitation light source, are assembled into a supplementary lighting lamp.

[0044] Alternatively, a white light source can be used, and the transmittance of light at 440–480 nm, 500–560 nm, and 620–680 nm can be controlled by using filters to achieve a light source that conforms to the characteristics described above.

[0045] A second aspect of this application provides a scanning pen, which includes a camera and a scanning pen fill light.

[0046] The scanning pen provided in the second aspect of this application includes a camera and the aforementioned scanning pen fill light. The emission spectrum of the scanning pen fill light includes at least a green main peak with a wavelength of 500-560nm, and may further include a red secondary peak with a wavelength of 620-680nm and a blue secondary peak with a wavelength of 440-480nm. This effectively improves the reflectivity difference of different colored inks in printed materials, enabling the camera to receive different reflection intensities for different colored inks in printed materials, thus better identifying the printing information corresponding to different colored inks and significantly improving the recognition rate of the scanning pen.

[0047] In some embodiments, the scanning pen of this application achieves a recognition rate of no less than 90%, and can reach over 93%, for printed images printed using a color printer with any one of the following colors as the font color (black, white, red, blue, green, cyan, red, and yellow) and any one of the following colors as the background color (red, green, blue, and black). In some embodiments, for printed materials with black text on a white background, the scanning pen achieves a recognition rate of no less than 99%. The scanning pen of this application, through reasonable control of the light source in the supplementary lighting, effectively improves the reflectivity differences of different colored inks in the printed material, enabling the camera to receive different reflection intensities for different colored inks, thereby better identifying the printing information corresponding to different colored inks and significantly improving the scanning pen's recognition rate. It has a particularly high recognition rate for text and background colors in printed materials.

[0048] In some embodiments, the scanning pen includes a camera and a scanning pen fill light; the scanning pen fill light includes a green primary peak with a wavelength of 500-560 nm, a red secondary peak with a wavelength of 620-680 nm, and a blue secondary peak with a wavelength of 440-480 nm; the ratio of the light intensity of the red secondary peak to that of the green primary peak is (0.1-0.4):1; the light intensity of the blue secondary peak is less than 0.2 times that of the green primary peak.

[0049] In some embodiments, this application does not specifically limit the way the fill light and camera are assembled into a scanning pen. Any feasible method can be used to assemble the fill light into the scanning pen containing the camera. By setting a special light source for the scanning pen fill light, the scanning pen provides a light source for the camera to scan and recognize printed materials, ensuring that the camera can clearly capture text images and improve the scanning pen's recognition rate of printed materials.

[0050] To enable those skilled in the art to clearly understand the above-described implementation details and operations, and to demonstrate the significant improvement in the performance of the scanning pen fill light and the scanning pen in the embodiments of this application, the above technical solutions are illustrated below through multiple embodiments.

[0051] Example 1

[0052] A scanning pen includes a camera and a scanning pen fill light. The emission spectrum of the scanning pen fill light includes a green main peak with a wavelength of 500-560 nm, a red secondary peak with a wavelength of 620-680 nm, and a blue secondary peak with a wavelength of 440-480 nm; wherein the light intensity values ​​of the green main peak, the red secondary peak, and the blue secondary peak are in a ratio of 1:0.4:0.1.

[0053] Comparative Example 1

[0054] A scanning pen differs from Embodiment 1 in that its supplementary light uses a common LED spectrum. This spectrum uses blue light to excite yellow phosphor to generate a white LED, and its spectral characteristics are typically that the peak is between 420 and 480 nm, with the highest proportion of blue light. The peak values ​​of green light (500 nm to 560 nm) and red light (620 nm to 680 nm) are both less than 30% of the peak value of blue light. The specific spectrum is shown in the attached figure. Figure 2 As shown.

[0055] Comparative Example 2

[0056] A scanning pen, differing from Example 1 in that: the supplementary light uses a full-spectrum LED, where the peak values ​​of blue, green, and red light are relatively close, and is made by exciting RGB phosphors with ultraviolet light, as detailed in the attached figure. Figure 2 As shown.

[0057] Furthermore, to verify the progressiveness of the embodiments of this application, the scanning pens provided in Examples 1-4 and Comparative Examples 1-2 were subjected to recognition rate tests under the same test conditions. The recognition rate test method / steps were as follows: eight colors were selected, namely black, white, red, blue, green, cyan, red, and yellow, as font colors, and red, green, blue, and black as background colors. Images were printed using a color printer, and the text in the printed images was scanned using the scanning pen device with special spectrum supplementary light in Example 1, the scanning pen device with ordinary LED in Comparative Example 1, and the scanning pen device with full spectrum LED in Comparative Example 2, respectively. The recognition rates were then statistically analyzed.

[0058] The test results are shown in Table 1 below. Test 1 uses red as the background color and the font color is from the color scheme in Table 1; Test 2 uses green as the background color and the font color is from the color scheme in Table 1; Test 3 uses blue as the background color and the font color is from the color scheme in Table 1; Test 1 uses black as the background color and the font color is from the color scheme in Table 1.

[0059] Table 1

[0060]

[0061]

[0062] According to the recognition results in Table 1 above, the recognition rate of the scanning pen using a special spectrum supplementary light in Example 1 reached 93%, while the recognition rate of the scanning pen using a common spectrum supplementary light in Comparative Example 1 was only 78.6%, and the recognition rate of the scanning pen using a full spectrum supplementary light in Comparative Example 2 was only 75%.

[0063] The test results above show that for the scanning pen provided in Comparative Example 1, which uses a common LED light source as a supplementary light, the red and green spectra have similar energies and are both relatively small (average relative intensity less than 20%). When the common LED light source illuminates a green background, the low green light content and low reflectivity of blue and red light result in low light intensity received by the camera and low image grayscale. When illuminating red text, the low red light content and low reflectivity of blue and green light result in low grayscale of the pixels corresponding to the text in the camera image. Therefore, in the scanned image, both the background and the text have low grayscale and low contrast, making it difficult for the algorithm to recognize the text in the image. In contrast, the scanning pen provided in Embodiment 1 of this application, which uses green light as the main light source supplemented by blue and red light as a supplementary light source, exhibits significant differences in reflectivity of the four inks (white, cyan, yellow, and magenta) in the area where green light energy is concentrated. Therefore, under green light illumination, the light intensity reflected by these four colors of ink will vary significantly, resulting in greater differences in the grayscale of the image captured by the camera. Furthermore, the use of red and blue light sources further enhances the difference in light intensity reflected by red and black inks, as well as cyan and yellow inks. This enables the scanning pen to effectively identify printing information of different colored inks in printed materials, improving its recognition rate for different colored printed materials.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A scanning pen fill light, characterized in that, The emission spectrum of the scanning pen's fill light includes a green main peak with a wavelength of 500-560nm, a red secondary peak with a wavelength of 620-680nm, and a blue secondary peak with a wavelength of 440-480nm. The ratio of the light intensity of the red secondary peak to that of the green main peak is (0.1-0.4):

1. The light intensity of the blue secondary peak is less than 0.2 times that of the green main peak. The scanning pen's fill light primarily uses green light, supplemented by red and blue light, enabling the scanning pen to identify and distinguish the four basic ink colors of cyan, magenta, yellow, and black in printed materials.

2. The scanning pen fill light as described in claim 1, characterized in that, The ratio of the light intensity of the red secondary peak to that of the green primary peak is (0.2~0.3):

1.

3. The scanning pen fill light as described in claim 2, characterized in that, The ratio of the light intensity of the blue secondary peak to that of the green primary peak is (0.1~0.15):

1.

4. A scanning pen, characterized in that, The scanning pen includes a camera and a scanning pen fill light as described in any one of claims 1 to 3.

5. The scanning pen as described in claim 4, characterized in that, For printed materials that use any one of black, white, red, blue, green, cyan, red, and yellow as the font color and any one of red, green, blue, and black as the background color, the recognition rate of the scanning pen shall not be less than 90%.

6. The scanning pen as described in claim 4 or 5, characterized in that, For black and white printed materials, the recognition rate of the scanning pen is no less than 99%.

Images