Brightness difference correction system, brightness difference correction method, and graph display structure

Abstract

A luminance difference correction system, a luminance difference correction method and a chart display structure are disclosed. The luminance difference correction system includes an object to be measured carrying device and a luminance difference correction device. The luminance difference correction device includes a chart display structure. The chart display structure includes a left upper, a left lower, a right upper, a right lower, a middle and a contrast partition chart. The luminance difference correction system is used to obtain a plurality of MTF values by calculating a modulation transfer function. The luminance difference correction system is used to convert an original left upper region MTF value to a corrected left upper region MTF value, convert an original left lower region MTF value to a corrected left lower region MTF value, convert an original right upper region MTF value to a corrected right upper region MTF value, convert an original right lower region MTF value to a corrected right lower region MTF value and convert an original middle region MTF value to a corrected middle region MTF value by comparing the region MTF values.

Description

Technical Field

[0001] This invention relates to a correction system, a correction method, and a display structure, and particularly to a brightness difference correction system, a brightness difference correction method, and a chart display structure. Background Technology

[0002] In the prior art, the image acquisition module includes a lens bracket, a lens structure, and an image sensing chip. The image acquisition module needs to pass an optical test through a predetermined chart. However, the predetermined chart may experience light attenuation or brightness reduction due to long-term use, which may cause the lens structure of the image acquisition module to fail the optical test. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a brightness difference correction system, a brightness difference correction method, and a chart display structure to address the shortcomings of the prior art.

[0004] To solve the aforementioned technical problems, one technical solution adopted by the present invention is to provide a brightness difference correction system, which includes: a test object carrier and a brightness difference correction device. The test object carrier is used to carry an image acquisition module, the image acquisition module including a lens bracket, a lens structure disposed on the lens bracket, and an image sensing chip corresponding to the lens structure. The brightness difference correction device includes a chart display structure, the chart display structure including a left upper partition chart, a left lower partition chart, a right upper partition chart, a right lower partition chart, a middle partition chart, and a control partition chart that are separated from each other; wherein, the brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF=[(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. min This represents the minimum brightness value. The brightness difference correction system is used to calculate the MTF value (G) of a control region in the control zoning chart through modulation conversion function calculation. M ), to obtain the original upper left region MTF value (UL) of the upper left partition chart. M ), to obtain the original lower left region MTF value (LL) of the lower left partition chart. M ), to obtain the original upper right region MTF value (UR) of the upper right partition chart. M ), to obtain the original lower right region MTF value (LR) of the lower right partition chart. M ) and obtain the original intermediate region MTF value (CT) of the intermediate partition chart.M The luminance difference correction system is used to convert the original upper-left region MTF value into a corrected upper-left region MTF value (UL) by comparing the MTF values ​​of the reference region. M '), convert the original lower left region MTF values ​​to a modified lower left region MTF value (LL). M '), convert the original top-right region MTF value to a modified top-right region MTF value (UR). M '), convert the original bottom right region MTF values ​​to a modified bottom right region MTF value (LR). M ') and converting the original intermediate region MTF values ​​into a modified intermediate region MTF value (CT). M ').

[0005] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a brightness difference correction method, which includes: providing a brightness difference correction system, wherein a chart display structure of the brightness difference correction system includes a left upper partition chart, a left lower partition chart, a right upper partition chart, a right lower partition chart, a middle partition chart, and a control partition chart that are separated from each other; the brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF=[(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. min The minimum luminance value; the luminance difference correction system is used to obtain the MTF value (G) of a control region in the control zoning chart by calculating the modulation conversion function. M ), to obtain the original upper left region MTF value (UL) of the upper left partition chart. M ), to obtain the original lower left region MTF value (LL) of the lower left partition chart. M ), to obtain the original upper right region MTF value (UR) of the upper right partition chart. M ), to obtain the original lower right region MTF value (LR) of the lower right partition chart. M ) and obtain the original intermediate region MTF value (CT) of the intermediate partition chart. M ); and, a luminance difference correction system is used to convert the original upper-left region MTF value into a corrected upper-left region MTF value (UL) by comparing the MTF values ​​of the reference region. M '), convert the original lower left region MTF values ​​to a modified lower left region MTF value (LL). M '), convert the original top-right region MTF value to a modified top-right region MTF value (UR).M '), convert the original bottom right region MTF values ​​to a modified bottom right region MTF value (LR). M ') and converting the original intermediate region MTF values ​​into a modified intermediate region MTF value (CT). M ').

[0006] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a chart display structure, which includes a top-left partition chart, a bottom-left partition chart, a top-right partition chart, a bottom-right partition chart, a middle partition chart, and a reference partition chart that are separated from each other; wherein, the areas of the top-left partition chart, the bottom-left partition chart, the top-right partition chart, the bottom-right partition chart, and the middle partition chart are the same or similar to each other, and the area of ​​the reference partition chart is 3 to 10 times greater than the area of ​​the middle partition chart.

[0007] One of the beneficial effects of the present invention is that the brightness difference correction system provided by the present invention can achieve the following: "A test object carrying device is used to carry an image acquisition module, the image acquisition module includes a lens bracket, a lens structure disposed on the lens bracket, and an image sensing chip corresponding to the lens structure"; "The brightness difference correction device includes a chart display structure, the chart display structure includes a left upper partition chart, a left lower partition chart, a right upper partition chart, a right lower partition chart, a middle partition chart, and a control partition chart that are separated from each other"; "The brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. minThe technical solution described is as follows: "For the minimum brightness value" and "The brightness difference correction system is used to calculate the modulation conversion function to obtain a reference region MTF value of the reference partition chart, an original upper left region MTF value of the upper left partition chart, an original lower left region MTF value of the lower left partition chart, an original upper right region MTF value of the upper right partition chart, an original lower right region MTF value of the lower right partition chart, and an original middle region MTF value of the middle partition chart". This allows the brightness difference correction system to convert the original upper left region MTF value into a corrected upper left region MTF value, the original lower left region MTF value into a corrected lower left region MTF value, the original upper right region MTF value into a corrected upper right region MTF value, the original lower right region MTF value into a corrected lower right region MTF value, and the original middle region MTF value into a corrected middle region MTF value, based on the reference region MTF value.

[0008] One of the beneficial effects of the present invention is that the brightness difference correction method provided by the present invention can achieve the following by "providing a brightness difference correction system, wherein a chart display structure of the brightness difference correction system includes a left upper partition chart, a left lower partition chart, a right upper partition chart, a right lower partition chart, a middle partition chart, and a control partition chart that are separate from each other", and "the brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. min The technical solution described is as follows: "For the minimum brightness value" and "The brightness difference correction system is used to calculate the modulation conversion function to obtain a reference region MTF value of the reference partition chart, an original upper left region MTF value of the upper left partition chart, an original lower left region MTF value of the lower left partition chart, an original upper right region MTF value of the upper right partition chart, an original lower right region MTF value of the lower right partition chart, and an original middle region MTF value of the middle partition chart". This allows the brightness difference correction system to convert the original upper left region MTF value into a corrected upper left region MTF value, the original lower left region MTF value into a corrected lower left region MTF value, the original upper right region MTF value into a corrected upper right region MTF value, the original lower right region MTF value into a corrected lower right region MTF value, and the original middle region MTF value into a corrected middle region MTF value, based on the reference region MTF value.

[0009] Another beneficial effect of the present invention is that the chart display structure provided by the present invention, through the technical solutions of "the chart display structure includes a left upper partition chart, a left lower partition chart, a right upper partition chart, a right lower partition chart, a middle partition chart and a reference partition chart that are separate from each other", "the area of ​​the left upper partition chart, the area of ​​the left lower partition chart, the area of ​​the right upper partition chart and the area of ​​the middle partition chart are the same or similar to each other", and "the area of ​​the reference partition chart is 3 to 10 times greater than the area of ​​the middle partition chart", can be applied to the brightness difference correction system and brightness difference correction method provided by the present invention.

[0010] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the brightness difference correction system provided by the present invention.

[0012] Figure 2 This is a schematic diagram of a first type of chart display structure provided by the brightness difference correction device of the present invention.

[0013] Figure 3 This is a schematic diagram of a second chart display structure provided by the brightness difference correction device of the present invention.

[0014] Figure 4 This is a schematic diagram of a third chart display structure provided by the brightness difference correction device of the present invention.

[0015] Figure 5 This is a schematic diagram of a fourth chart display structure provided by the brightness difference correction device of the present invention.

[0016] Figure 6 The flowchart shows the brightness difference correction method provided by the present invention. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of the "brightness difference correction system, brightness difference correction method, and chart display structure" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, it should be stated in advance that the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions based on actual dimensions. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. Additionally, the term "or" used herein may, depending on the actual situation, include any combination of any one or more of the associated listed items.

[0018] [First Embodiment]

[0019] See Figures 1 to 5 As shown, the first embodiment of the present invention provides a brightness difference correction system S, which includes at least: a test object carrying device 1 and a brightness difference correction device 2.

[0020] First, cooperate Figure 1 and Figure 2As shown, the object-under-test carrying device 1 can be used to carry an image acquisition module M, and the image acquisition module M includes a lens bracket M1, a lens structure M2 disposed on the lens bracket M1, and an image sensing chip M3 corresponding to the lens structure M2. In addition, the brightness difference correction device 2 includes a chart display structure 21, and the chart display structure 21 includes a left upper partition chart 211 (or the chart area of ​​the upper left part), a left lower partition chart 212 (or the chart area of ​​the lower left part), a right upper partition chart 213 (or the chart area of ​​the upper right part), a right lower partition chart 214 (or the chart area of ​​the lower right part), a middle partition chart 215 (or the middle part of the chart area), and a comparison partition chart 216 (or the comparison part of the chart area). For example, the object-bearing device 1 can be any fixing device or clamping device used to position or fix the image acquisition module M. The lens structure M2 can include a protective housing (not labeled) disposed inside the lens bracket M1 and at least one lens (or a lens group composed of multiple lenses, not labeled) disposed within the protective housing. The image sensing chip M3 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) sensor. Additionally, the brightness difference correction device 2 can also include a data processing module 22 (e.g., a computer microprocessor) electrically connected to the image sensing chip M3 via a circuit board (not labeled) and a chart-carrying module (not labeled) for carrying the chart display structure 21. It is worth noting that, for example... Figure 1 As shown, the diagram illustrates that structure 21 can be composed of multiple small square regions, and any one of the upper left partition diagram 211, lower left partition diagram 212, upper right partition diagram 213, lower right partition diagram 214, middle partition diagram 215, and comparison partition diagram 216 can include complete multiple small square regions or incomplete multiple small square regions. However, the above examples are merely one possible embodiment and are not intended to limit the invention.

[0021] Furthermore, cooperation Figure 1 and Figure 2 As shown, the luminance difference correction system S can be used to obtain multiple MTF values ​​through the calculation of a modulation transfer function (MTF), and the modulation transfer function can conform to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where Imax I represents the maximum brightness value. min This represents the minimum brightness value. Furthermore, the brightness difference correction system S can be used to calculate the modulation conversion function to obtain the "one-control area MTF value (G)" of the control area in the control partition chart 216. M )”, to obtain the original upper left region MTF value (UL) of the upper left partition chart 211. M )”, to obtain the original lower left region MTF value (LL) of the lower left partition chart 212. M )”, to obtain the original upper right region MTF value (UR) of the upper right partition chart 213. M The original lower right region MTF value (LR) of the lower right partition chart 214 is obtained. M "and obtain the original intermediate region MTF value (CT) of the intermediate partition chart 215" M It is worth noting that, for example, the modulation conversion function can be stored in the data processing module 22 for processing the chart information obtained from the chart display structure 21 by the image sensing chip M3.

[0022] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the reference zoning chart 216, a maximum brightness value (I) of the reference zoning chart 216 is obtained. max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​in the comparison partition chart 216, the brightness difference correction system S can be used to calculate the MTF value (G) of the comparison region in the comparison partition chart 216 through modulation conversion function calculation. M ).

[0023] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the upper left partition chart 211, a maximum brightness value (I) of the upper left partition chart 211 is obtained. max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​of the upper left partition chart 211, the brightness difference correction system S can be used to calculate the original upper left region MTF value of the upper left partition chart 211 through modulation conversion function calculation. Thus, the brightness difference correction system S can be used to compare the MTF value of the control region (G... M ), to obtain the original top left region MTF value (UL) M Converted to a modified top-left region MTF value (UL) M'), and the corrected MTF value for the upper left region can conform to the following formula: UL M '=UL M / G M .

[0024] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the lower left partition chart 212, a maximum brightness value (I) of the lower left partition chart 212 is obtained. max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​of the lower left partition chart 212, the brightness difference correction system S can be used to calculate the original lower left region MTF value of the lower left partition chart 212 through modulation conversion function calculation. Thus, the brightness difference correction system S can be used to compare the MTF value of the control region (G... M ), to obtain the original lower left region MTF value (LL) M Converted to a modified lower left region MTF value (LL) M '), and the corrected MTF value in the upper left region can conform to the following formula: LL M '=LL M / G M .

[0025] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the upper right partition chart 213, a maximum brightness value (I) of the upper right partition chart 213 is obtained. max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​of the upper right partition chart 213, the brightness difference correction system S can be used to calculate the original upper right region MTF value of the upper right partition chart 213 through modulation conversion function calculation. Thus, the brightness difference correction system S can be used to compare the MTF value of the control region (G... M ), to obtain the original upper right region MTF value (UR) M Convert to a modified upper right region MTF value (UR) M '), and the corrected MTF value in the upper right region can conform to the following formula: UR M '=UR M / G M .

[0026] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the lower right partition chart 214, a maximum brightness value (I) of the lower right partition chart 214 is obtained.max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​of the lower right partition chart 214, the brightness difference correction system S can be used to calculate the original lower right region MTF value of the lower right partition chart 214 through modulation conversion function calculation. Thus, the brightness difference correction system S can be used to compare the MTF value of the control region (G... M ), to obtain the original lower right region MTF value (LR) M Converted to a modified lower right region MTF value (LR) M '), and the corrected MTF value in the lower right region can conform to the following formula: LR M '=LR M / G M .

[0027] For example, coordination Figure 1 and Figure 2 As shown, when the image sensing chip M3 is used to acquire the intermediate partition chart 215, a maximum brightness value (I) of the intermediate partition chart 215 is obtained. max ) and a minimum brightness value (I) min Following this, based on the brightness information provided by the maximum and minimum brightness values ​​of the intermediate partition chart 215, the brightness difference correction system S can be used to calculate the original intermediate region MTF value of the intermediate partition chart 215 through modulation conversion function calculation. Thus, the brightness difference correction system S can be used to obtain the original intermediate region MTF value of the intermediate partition chart 215 through the comparison region MTF value (G M ), to obtain the original intermediate region MTF value (CT) M Converted to a corrected intermediate region MTF value (CT) M '), and the corrected intermediate region MTF value can conform to the following formula: CT M '=CT M / G M .

[0028] In this way, the brightness difference correction system S can be used to "obtain chart information from the chart display structure 21 through the image sensing chip M3" and "calculate the chart information through the modulation conversion function stored in the data processing module 22" to obtain the MTF value of the control area, the original MTF value of the upper left area, the original MTF value of the lower left area, the original MTF value of the upper right area, the original MTF value of the lower right area, the original MTF value of the middle area, the corrected MTF value of the upper left area, the corrected MTF value of the lower left area, the corrected MTF value of the upper right area, the corrected MTF value of the lower right area, and the corrected MTF value of the middle area. It is worth noting that the original MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region can be replaced by the corrected MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region, respectively, for optical testing. This is to avoid the lens structure M2 of the image acquisition module M failing the optical test due to the original MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region being too small (caused by light attenuation or brightness reduction).

[0029] For example, coordination Figures 2 to 5 As shown in any of the figures, the middle partition chart 215 and the comparison partition chart 216 can be located between the upper left partition chart 211, the lower left partition chart 212, the upper right partition chart 213, and the lower right partition chart 214. Additionally, the comparison partition chart 216 can be positioned above the middle partition chart 215 and between the upper left partition chart 211, the upper right partition chart 213, and the middle partition chart 215 (e.g., ...). Figure 2 and Figure 4 (as shown); or, the corresponding partition chart 216 can also be placed below the middle partition chart 215, and between the lower left partition chart 212, the lower right partition chart 214, and the middle partition chart 215 (as shown). Figure 3 and Figure 5 (As shown). It is worth noting that the reference partition chart 216 may be fixed to the chart display structure 21, or the reference partition chart 216 may be replaceable and not fixed to the chart display structure 21. That is, depending on different needs, the reference partition chart 216 may be fixedly or detachably set on the chart display structure 21. However, the examples given above are only one possible embodiment and are not intended to limit the present invention.

[0030] For example, coordination Figures 2 to 5As shown in any of the figures, the upper left partition chart 211 is located in the upper left area of ​​the middle partition chart 215, the lower left partition chart 212 is located in the lower left area of ​​the middle partition chart 215, the upper right partition chart 213 is located in the upper right area of ​​the middle partition chart 215, and the lower right partition chart 214 is located in the lower right area of ​​the middle partition chart 215. It is worth noting that any one of the four partition charts 211, 212, 213, and 214 has the same shortest distance from the middle partition chart 215. That is, relative to the middle partition chart 215, the four partition charts 211, 212, 213, and 214 can be arranged symmetrically on the chart display structure 21. However, the above examples are merely one possible embodiment and are not intended to limit the invention.

[0031] For example, coordination Figures 2 to 5 As shown in any of the figures, the upper left partition chart 211 has multiple upper left black areas 211B and multiple upper left white areas 211W; the lower left partition chart 212 has multiple lower left black areas 212B and multiple lower left white areas 212W; the upper right partition chart 213 has multiple upper right black areas 213B and multiple upper right white areas 213W; the lower right partition chart 214 has multiple lower right black areas 214B and multiple lower right white areas 214W; the middle partition chart 215 has multiple middle black areas 215B and multiple middle white areas 215W; and the comparison partition chart 216 has multiple comparison black areas 216B and multiple comparison white areas 216W (e.g., ...). Figure 2 and Figure 3 (as shown), or the reference partition chart 216 has at least one reference black area 216B and at least one reference white area 216W (as shown). Figure 4 and Figure 5 (As shown). However, the examples given above are merely one possible embodiment and are not intended to limit the invention.

[0032] For example, coordination Figures 2 to 5As shown in any of the figures, the areas of the top-left partition chart 211, the bottom-left partition chart 212, the top-right partition chart 213, the bottom-right partition chart 214, and the middle partition chart 215 can be the same or similar to each other. Furthermore, the total area of ​​the multiple top-left black areas 211B of the top-left partition chart 211, the total area of ​​the multiple bottom-left black areas 212B of the bottom-left partition chart 212, the total area of ​​the multiple top-right black areas 213B of the top-right partition chart 213, the total area of ​​the multiple bottom-right black areas 214B of the bottom-right partition chart 214, and the total area of ​​the multiple middle black areas 215B of the middle partition chart 215 can be the same or similar to each other. Furthermore, the total area of ​​the plurality of upper-left white areas 211W in the upper-left partition chart 211, the total area of ​​the plurality of lower-left white areas 212W in the lower-left partition chart 212, the total area of ​​the plurality of upper-right white areas 213W in the upper-right partition chart 213, the total area of ​​the plurality of lower-right white areas 214W in the lower-right partition chart 214, and the total area of ​​the plurality of middle white areas 215W in the middle partition chart 215 can be the same as or similar to each other. However, the examples given above are merely one possible embodiment and are not intended to limit the present invention.

[0033] For example, coordination Figures 2 to 5 As shown in any of the figures, the area of ​​the contrast partition chart 216 can be 3 to 10 times larger than the area of ​​the intermediate partition chart 215. Furthermore, the area of ​​at least one contrast black region 216B of the contrast partition chart 216, or the total area of ​​the plurality of contrast black regions 216B of the contrast partition chart 216, can be 3 to 10 times larger than the total area of ​​the plurality of intermediate black regions 215B of the intermediate partition chart 215. Additionally, the area of ​​at least one contrast white region 216W of the contrast partition chart 216, or the total area of ​​the plurality of contrast white regions 216W of the contrast partition chart 216, can be 3 to 10 times larger than the total area of ​​the plurality of intermediate white regions 215W of the intermediate partition chart 215. However, the examples described above are merely one possible embodiment and are not intended to limit the invention.

[0034] [Second Embodiment]

[0035] See Figures 1 to 6As shown, the second embodiment of the present invention provides a brightness difference correction method. The main difference between the second embodiment and the first embodiment is that the brightness difference correction method provided in the second embodiment includes at least the following steps: First, a brightness difference correction system S is provided. A chart display structure 21 of the brightness difference correction system S includes a left upper partition chart 211, a left lower partition chart 212, a right upper partition chart 213, a right lower partition chart 214, a middle partition chart 215, and a reference partition chart 216, which are separated from each other (step S100); then, the brightness difference correction system S is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF) (step S102). The modulation transfer function conforms to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. min The minimum luminance value is then used; subsequently, the luminance difference correction system S is used to calculate the MTF value (G) of a control region in the control partition chart 216 through modulation conversion function calculation. M ), to obtain the original upper left region MTF value (UL) of the upper left partition chart 211. M ), to obtain the original lower left region MTF value (LL) of the lower left partition chart 212. M ), to obtain the original upper right region MTF value (UR) of the upper right partition chart 213. M ), to obtain the original lower right region MTF value (LR) of the lower right partition chart 214. M And obtain the original intermediate region MTF value (CT) of the intermediate partition chart 215. M (Step S104); Next, the luminance difference correction system S is used to convert the original upper left region MTF value into a corrected upper left region MTF value (UL) by comparing the MTF value of the reference region. M '), convert the original lower left region MTF values ​​to a modified lower left region MTF value (LL). M '), convert the original top-right region MTF value to a modified top-right region MTF value (UR). M '), convert the original bottom right region MTF values ​​to a modified bottom right region MTF value (LR). M ') and converting the original intermediate region MTF values ​​into a modified intermediate region MTF value (CT). M (Step S106).

[0036] In this way, the brightness difference correction system S can be used to "obtain chart information from the chart display structure 21 through the image sensing chip M3" and "calculate the chart information through the modulation conversion function stored in the data processing module 22" to obtain the MTF value of the control area, the original MTF value of the upper left area, the original MTF value of the lower left area, the original MTF value of the upper right area, the original MTF value of the lower right area, the original MTF value of the middle area, the corrected MTF value of the upper left area, the corrected MTF value of the lower left area, the corrected MTF value of the upper right area, the corrected MTF value of the lower right area, and the corrected MTF value of the middle area. It is worth noting that the original MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region can be replaced by the corrected MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region, respectively, for optical testing. This is to avoid the lens structure M2 of the image acquisition module M failing the optical test due to the original MTF values ​​of the upper left region, lower left region, upper right region, lower right region, and middle region being too small (caused by light attenuation or brightness reduction).

[0037] [Beneficial Effects of the Examples]

[0038] One of the beneficial effects of the present invention is that the brightness difference correction system S provided by the present invention can achieve the following: "The object-to-be-carrying device 1 is used to carry an image acquisition module M, the image acquisition module M includes a lens bracket M1, a lens structure M2 disposed on the lens bracket M1, and an image sensing chip M3 corresponding to the lens structure M2"; "The brightness difference correction device 2 includes a chart display structure 21, the chart display structure 21 includes a left upper partition chart 211, a left lower partition chart 212, a right upper partition chart 213, a right lower partition chart 214, a middle partition chart 215, and a control partition chart 216, which are separated from each other"; "The brightness difference correction system S is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. minThe technical solution described is as follows: "For the minimum brightness value" and "The brightness difference correction system S is used to calculate the modulation conversion function to obtain a reference region MTF value of the reference partition chart 216, an original upper left region MTF value of the upper left partition chart 211, an original lower left region MTF value of the lower left partition chart 212, an original upper right region MTF value of the upper right partition chart 213, an original lower right region MTF value of the lower right partition chart 214, and an original middle region MTF value of the middle partition chart 215". This allows the brightness difference correction system S to be used to convert the original upper left region MTF value into a corrected upper left region MTF value, the original lower left region MTF value into a corrected lower left region MTF value, the original upper right region MTF value into a corrected upper right region MTF value, the original lower right region MTF value into a corrected lower right region MTF value, and the original middle region MTF value into a corrected middle region MTF value, based on the reference region MTF value.

[0039] One of the beneficial effects of the present invention is that the brightness difference correction method provided by the present invention can achieve the following by "providing a brightness difference correction system S, wherein a chart display structure 21 of the brightness difference correction system S includes a left upper partition chart 211, a left lower partition chart 212, a right upper partition chart 213, a right lower partition chart 214, a middle partition chart 215, and a control partition chart 216, which are separated from each other"; and "the brightness difference correction system S is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: MTF = [(I max -I min ) / (I max +I min )]×100%, where I max I represents the maximum brightness value. minThe technical solution described is as follows: "For the minimum brightness value" and "The brightness difference correction system S is used to calculate the modulation conversion function to obtain a reference region MTF value of the reference partition chart 216, an original upper left region MTF value of the upper left partition chart 211, an original lower left region MTF value of the lower left partition chart 212, an original upper right region MTF value of the upper right partition chart 213, an original lower right region MTF value of the lower right partition chart 214, and an original middle region MTF value of the middle partition chart 215". This allows the brightness difference correction system S to be used to convert the original upper left region MTF value into a corrected upper left region MTF value, the original lower left region MTF value into a corrected lower left region MTF value, the original upper right region MTF value into a corrected upper right region MTF value, the original lower right region MTF value into a corrected lower right region MTF value, and the original middle region MTF value into a corrected middle region MTF value, based on the reference region MTF value.

[0040] Another beneficial effect of the present invention is that the chart display structure 21 provided by the present invention, through the technical solutions of "the chart display structure 21 includes a left upper partition chart 211, a left lower partition chart 212, a right upper partition chart 213, a right lower partition chart 214, a middle partition chart 215 and a reference partition chart 216 which are separated from each other", "the areas of the left upper partition chart 211, the left lower partition chart 212, the right upper partition chart 213, the right lower partition chart 214 and the middle partition chart 215 are the same or similar to each other", and "the area of ​​the reference partition chart 216 is 3 to 10 times greater than the area of ​​the middle partition chart 215", can be applied to the brightness difference correction system S and brightness difference correction method provided by the present invention.

[0041] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of protection of the claims of the present invention. Therefore, all equivalent technical changes made based on the content of the present invention specification and drawings are included within the scope of protection of the claims of the present invention.

Claims

1. A brightness difference correction system, characterized in that, The brightness difference correction system includes: A test object carrier device, the test object carrier device being used to carry an image acquisition module, the image acquisition module including a lens bracket, a lens structure disposed on the lens bracket, and an image sensing chip corresponding to the lens structure; and A brightness difference correction device, the brightness difference correction device includes a chart display system, the chart display system includes a top left partition chart, a bottom left partition chart, a top right partition chart, a bottom right partition chart, a middle partition chart and a reference partition chart that are separated from each other. The brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: ,in This is the maximum brightness value. This is the minimum brightness value; The brightness difference correction system is used to obtain the MTF value G of a control region in the control zoning chart by calculating the modulation conversion function. M Obtain the original upper left region MTF value UL of the upper left partition chart. M Obtain the original lower left region MTF value LL of the lower left partition chart. M Obtain the original upper right region MTF value UR of the upper right partition chart. M Obtain the original lower right region MTF value LR of the lower right partition chart. M And to obtain an original intermediate region MTF value CT of the intermediate partition chart. M ; The brightness difference correction system is used to convert the original upper-left region MTF value into a corrected upper-left region MTF value UL using the reference region MTF value. M The original lower left region MTF value is converted into a modified lower left region MTF value LL. M 'Convert the original upper right region MTF value into a modified upper right region MTF value UR.' M The original lower right region MTF value is converted into a modified lower right region MTF value LR. M 'and convert the original intermediate region MTF value into a modified intermediate region MTF value CT' M '.

2. The brightness difference correction system according to claim 1, characterized in that, in, The brightness difference correction device includes a data processing module that stores the modulation conversion function, for processing chart information obtained from the chart display system to obtain the MTF value of the control area, the original MTF value of the upper left area, the original MTF value of the lower left area, the original MTF value of the upper right area, the original MTF value of the lower right area, the original MTF value of the middle area, the corrected MTF value of the upper left area, the corrected MTF value of the lower left area, the corrected MTF value of the upper right area, the corrected MTF value of the lower right area, and the corrected MTF value of the middle area. The modified upper left region MTF value conforms to the following formula: UL M '=UL M / G M ; The modified lower left region MTF value conforms to the following formula: LL M '=LL M / G M ; The corrected MTF value in the upper right region conforms to the following formula: UR M '=UR M / G M ; The corrected lower right region MTF value conforms to the following formula: LR M '=LR M / G M ; The corrected intermediate region MTF value conforms to the following formula: CT M '=CT M / G M .

3. The brightness difference correction system according to claim 1, characterized in that, in, After the image sensing chip is used to acquire the reference partition map and obtain a maximum brightness value and a minimum brightness value of the reference partition map, the brightness difference correction system is used to obtain the MTF value of the reference region of the reference partition map by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the reference partition map. Wherein, after the image sensing chip is used to acquire the upper left partition chart and obtain a maximum brightness value and a minimum brightness value of the upper left partition chart, the brightness difference correction system is used to obtain the original upper left region MTF value of the upper left partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the upper left partition chart. Wherein, after the image sensing chip is used to acquire the lower left partition map and obtain a maximum brightness value and a minimum brightness value of the lower left partition map, the brightness difference correction system is used to obtain the original lower left region MTF value of the lower left partition map by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the lower left partition map. Wherein, after the image sensing chip is used to acquire the upper right partition chart and obtain a maximum brightness value and a minimum brightness value of the upper right partition chart, the brightness difference correction system is used to obtain the original upper right region MTF value of the upper right partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the upper right partition chart. Wherein, after the image sensing chip is used to acquire the lower right partition chart and obtain a maximum brightness value and a minimum brightness value of the lower right partition chart, the brightness difference correction system is used to obtain the original lower right region MTF value of the lower right partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the lower right partition chart. Wherein, after the image sensing chip is used to acquire the intermediate partition map and obtain a maximum brightness value and a minimum brightness value of the intermediate partition map, the brightness difference correction system is used to obtain the original intermediate region MTF value of the intermediate partition map by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the intermediate partition map.

4. The brightness difference correction system according to claim 1, characterized in that, in, The middle partition chart and the reference partition chart are located between the top left partition chart, the bottom left partition chart, the top right partition chart and the bottom right partition chart, and the reference partition chart is located between the top left partition chart, the top right partition chart and the middle partition chart, or between the bottom left partition chart, the bottom right partition chart and the middle partition chart. Wherein, the top left partition chart is located in the upper left area of ​​the middle partition chart, the bottom left partition chart is located in the lower left area of ​​the middle partition chart, the top right partition chart is located in the upper right area of ​​the middle partition chart, and the bottom right partition chart is located in the lower right area of ​​the middle partition chart, and any one of the top left partition chart, the bottom left partition chart, the top right partition chart, and the bottom right partition chart has the same shortest distance to the middle partition chart; The upper left partition chart has multiple upper left black areas and multiple upper left white areas; the lower left partition chart has multiple lower left black areas and multiple lower left white areas; the upper right partition chart has multiple upper right black areas and multiple upper right white areas; the lower right partition chart has multiple lower right black areas and multiple lower right white areas; the middle partition chart has multiple middle black areas and multiple middle white areas; and the comparison partition chart has at least one comparison black area and at least one comparison white area, or the comparison partition chart has multiple comparison black areas and multiple comparison white areas. Wherein, the total area of ​​the plurality of upper left black areas in the upper left partition chart, the total area of ​​the plurality of lower left black areas in the lower left partition chart, the total area of ​​the plurality of upper right black areas in the upper right partition chart, the total area of ​​the plurality of lower right black areas in the lower right partition chart, and the total area of ​​the plurality of middle black areas in the middle partition chart are the same or similar to each other, and the area of ​​the at least one reference black area in the reference partition chart or the total area of ​​the plurality of reference black areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle black areas in the middle partition chart; Wherein, the total area of ​​the plurality of upper left white areas in the upper left partition chart, the total area of ​​the plurality of lower left white areas in the lower left partition chart, the total area of ​​the plurality of upper right white areas in the upper right partition chart, the total area of ​​the plurality of lower right white areas in the lower right partition chart, and the total area of ​​the plurality of middle white areas in the middle partition chart are the same as or similar to each other, and the area of ​​the at least one reference white area in the reference partition chart or the total area of ​​the plurality of reference white areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle white areas in the middle partition chart.

5. A method for correcting brightness differences, characterized in that, The brightness difference correction method includes: A brightness difference correction system is provided, wherein a chart display system of the brightness difference correction system includes a top left partition chart, a bottom left partition chart, a top right partition chart, a bottom right partition chart, a middle partition chart and a reference partition chart that are separated from each other. The brightness difference correction system is used to obtain multiple MTF values ​​by calculating a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula: ,in This is the maximum brightness value. This is the minimum brightness value; The brightness difference correction system is used to obtain the MTF value G of a control region in the control zoning chart by calculating the modulation conversion function. M Obtain the original upper left region MTF value UL of the upper left partition chart. M Obtain the original lower left region MTF value LL of the lower left partition chart. M Obtain the original upper right region MTF value UR of the upper right partition chart. M Obtain the original lower right region MTF value LR of the lower right partition chart. M And to obtain an original intermediate region MTF value CT of the intermediate partition chart. M ;as well as The brightness difference correction system is used to convert the original upper-left region MTF value into a corrected upper-left region MTF value UL using the reference region MTF value. M The original lower left region MTF value is converted into a modified lower left region MTF value LL. M 'Convert the original upper right region MTF value into a modified upper right region MTF value UR.' M The original lower right region MTF value is converted into a modified lower right region MTF value LR. M 'and convert the original intermediate region MTF value into a modified intermediate region MTF value CT' M '.

6. The brightness difference correction method according to claim 5, characterized in that, in, The brightness difference correction system includes a data processing module that stores the modulation conversion function, for processing chart information obtained from the chart display system to obtain the MTF value of the control area, the original MTF value of the upper left area, the original MTF value of the lower left area, the original MTF value of the upper right area, the original MTF value of the lower right area, the original MTF value of the middle area, the corrected MTF value of the upper left area, the corrected MTF value of the lower left area, the corrected MTF value of the upper right area, the corrected MTF value of the lower right area, and the corrected MTF value of the middle area. The modified upper left region MTF value conforms to the following formula: UL M '=UL M / G M ; The modified lower left region MTF value conforms to the following formula: LL M '=LL M / G M ; The corrected MTF value in the upper right region conforms to the following formula: UR M '=UR M / G M ; The corrected lower right region MTF value conforms to the following formula: LR M '=LR M / G M ; The corrected intermediate region MTF value conforms to the following formula: CT M '=CT M / G M .

7. The brightness difference correction method according to claim 5, characterized in that, in, The brightness difference correction method uses an image sensing chip; Wherein, after the image sensing chip is used to acquire the reference partition chart and obtain a maximum brightness value and a minimum brightness value of the reference partition chart, the brightness difference correction system is used to obtain the reference region MTF value of the reference partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the reference partition chart. Wherein, after the image sensing chip is used to acquire the upper left partition chart and obtain a maximum brightness value and a minimum brightness value of the upper left partition chart, the brightness difference correction system is used to obtain the original upper left region MTF value of the upper left partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the upper left partition chart. Wherein, after the image sensing chip is used to acquire the lower left partition map and obtain a maximum brightness value and a minimum brightness value of the lower left partition map, the brightness difference correction system is used to obtain the original lower left region MTF value of the lower left partition map by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the lower left partition map. Wherein, after the image sensing chip is used to acquire the upper right partition chart and obtain a maximum brightness value and a minimum brightness value of the upper right partition chart, the brightness difference correction system is used to obtain the original upper right region MTF value of the upper right partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the upper right partition chart. Wherein, after the image sensing chip is used to acquire the lower right partition chart and obtain a maximum brightness value and a minimum brightness value of the lower right partition chart, the brightness difference correction system is used to obtain the original lower right region MTF value of the lower right partition chart by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the lower right partition chart. Wherein, after the image sensing chip is used to acquire the intermediate partition map and obtain a maximum brightness value and a minimum brightness value of the intermediate partition map, the brightness difference correction system is used to obtain the original intermediate region MTF value of the intermediate partition map by calculating the modulation conversion function based on the maximum brightness value and the minimum brightness value of the intermediate partition map.

8. The brightness difference correction method according to claim 5, characterized in that, in, The middle partition chart and the reference partition chart are located between the top left partition chart, the bottom left partition chart, the top right partition chart and the bottom right partition chart, and the reference partition chart is located between the top left partition chart, the top right partition chart and the middle partition chart, or between the bottom left partition chart, the bottom right partition chart and the middle partition chart. Wherein, the top left partition chart is located in the upper left area of ​​the middle partition chart, the bottom left partition chart is located in the lower left area of ​​the middle partition chart, the top right partition chart is located in the upper right area of ​​the middle partition chart, and the bottom right partition chart is located in the lower right area of ​​the middle partition chart, and any one of the top left partition chart, the bottom left partition chart, the top right partition chart, and the bottom right partition chart has the same shortest distance to the middle partition chart; The upper left partition chart has multiple upper left black areas and multiple upper left white areas; the lower left partition chart has multiple lower left black areas and multiple lower left white areas; the upper right partition chart has multiple upper right black areas and multiple upper right white areas; the lower right partition chart has multiple lower right black areas and multiple lower right white areas; the middle partition chart has multiple middle black areas and multiple middle white areas; and the comparison partition chart has at least one comparison black area and at least one comparison white area, or the comparison partition chart has multiple comparison black areas and multiple comparison white areas. Wherein, the total area of ​​the plurality of upper left black areas in the upper left partition chart, the total area of ​​the plurality of lower left black areas in the lower left partition chart, the total area of ​​the plurality of upper right black areas in the upper right partition chart, the total area of ​​the plurality of lower right black areas in the lower right partition chart, and the total area of ​​the plurality of middle black areas in the middle partition chart are the same or similar to each other, and the area of ​​the at least one reference black area in the reference partition chart or the total area of ​​the plurality of reference black areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle black areas in the middle partition chart; Wherein, the total area of ​​the plurality of upper left white areas in the upper left partition chart, the total area of ​​the plurality of lower left white areas in the lower left partition chart, the total area of ​​the plurality of upper right white areas in the upper right partition chart, the total area of ​​the plurality of lower right white areas in the lower right partition chart, and the total area of ​​the plurality of middle white areas in the middle partition chart are the same as or similar to each other, and the area of ​​the at least one reference white area in the reference partition chart or the total area of ​​the plurality of reference white areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle white areas in the middle partition chart.

9. A chart display system, characterized in that, The chart display system includes a top-left partition chart, a bottom-left partition chart, a top-right partition chart, a bottom-right partition chart, a middle partition chart, and a reference partition chart, all separated from each other. The areas of the top-left partition chart, the bottom-left partition chart, the top-right partition chart, the bottom-right partition chart, and the middle partition chart are the same or similar to each other, and the area of ​​the reference partition chart is 3 to 10 times greater than the area of ​​the middle partition chart. The middle partition chart and the reference partition chart are located between the upper left partition chart, the lower left partition chart, the upper right partition chart and the lower right partition chart, and the reference partition chart is located between the upper left partition chart, the upper right partition chart and the middle partition chart, or between the lower left partition chart, the lower right partition chart and the middle partition chart. Wherein, the top left partition chart is located in the upper left area of ​​the middle partition chart, the bottom left partition chart is located in the lower left area of ​​the middle partition chart, the top right partition chart is located in the upper right area of ​​the middle partition chart, and the bottom right partition chart is located in the lower right area of ​​the middle partition chart, and any one of the top left partition chart, the bottom left partition chart, the top right partition chart, and the bottom right partition chart has the same shortest distance to the middle partition chart; The upper left partition chart has multiple upper left black areas and multiple upper left white areas; the lower left partition chart has multiple lower left black areas and multiple lower left white areas; the upper right partition chart has multiple upper right black areas and multiple upper right white areas; the lower right partition chart has multiple lower right black areas and multiple lower right white areas; the middle partition chart has multiple middle black areas and multiple middle white areas; and the comparison partition chart has at least one comparison black area and at least one comparison white area, or the comparison partition chart has multiple comparison black areas and multiple comparison white areas. Wherein, the total area of ​​the plurality of upper left black areas in the upper left partition chart, the total area of ​​the plurality of lower left black areas in the lower left partition chart, the total area of ​​the plurality of upper right black areas in the upper right partition chart, the total area of ​​the plurality of lower right black areas in the lower right partition chart, and the total area of ​​the plurality of middle black areas in the middle partition chart are the same or similar to each other, and the area of ​​the at least one reference black area in the reference partition chart or the total area of ​​the plurality of reference black areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle black areas in the middle partition chart; Wherein, the total area of ​​the plurality of upper left white areas in the upper left partition chart, the total area of ​​the plurality of lower left white areas in the lower left partition chart, the total area of ​​the plurality of upper right white areas in the upper right partition chart, the total area of ​​the plurality of lower right white areas in the lower right partition chart, and the total area of ​​the plurality of middle white areas in the middle partition chart are the same as or similar to each other, and the area of ​​the at least one reference white area in the reference partition chart or the total area of ​​the plurality of reference white areas in the reference partition chart is greater than 3 to 10 times the total area of ​​the plurality of middle white areas in the middle partition chart.

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