TWI798874B - Brightness difference correction system, brightness difference correction method, and chart display structure - Google Patents

Abstract

The present invention provides a brightness difference correction system, a brightness difference correction method, and a chart display structure. The brightness difference correction system includes a measured object carrying device, and a brightness difference correction device. The brightness difference correction device includes a chart display structure. The chart display structure includes a left upper region chart, a left lower region chart, a right upper region chart, a right lower region chart, a middle region chart, and a control region chart that are separate from each other. Therefore, the brightness difference correction system can be configured to obtain a plurality of MTF values by calculating a _Modulation transfer function. the brightness difference correction system can be configured to use a control region MTF value to transfer an original left upper region MTF value into an amended left upper region MTF value, to transfer an original left lower region MTF value into an amended left lower region MTF value, to transfer an original right upper region MTF value into an amended right upper region MTF value, to transfer an original right lower region MTF value into an amended right lower region MTF value, and to transfer an original middle region MTF value into an amended middle region MTF value.

Description

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

The invention relates to a correction system, a correction method and a display structure, in particular to a brightness difference correction system, a brightness difference correction method and a chart display structure.

In the prior art, the image capture module includes a lens holder, a lens structure, and an image sensor chip, and the image capture module needs to pass through a predetermined chart for optical testing, but the predetermined chart will be damaged due to long-term use. In this way, light attenuation or brightness reduction occurs, which leads to the failure of the lens structure of the image capture module to pass the optical test.

The technical problem to be solved by the present invention is to provide a luminance difference correction system, a luminance difference correction method and a graph display structure in view of the deficiencies in the prior art.

為最小亮度值。其中，亮度差異修正系統用於透過調變轉換函數的計算，以得到對照區域圖表的一對照區域MTF值(G _M)、得到左上區域圖表的一原始的左上區域MTF值(UL _M)、得到左下區域圖表的一原始的左下區域MTF值(LL _M)、得到右上區域圖表的一原始的右上區域MTF值(UR _M)、得到右下區域圖表的一原始的右下區域MTF值(LR _M)以及得到中間區域圖表的一原始的中間區域MTF值(CT _M)。其中，亮度差異修正系統用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值(UL _M’)、將原始的左下區域MTF值轉換為一修正的左下區域MTF值(LL _M’)、將原始的右上區域MTF值轉換為一修正的右上區域MTF值(UR _M’)、將原始的右下區域MTF值轉換為一修正的右下區域MTF值(LR _M’)以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值(CT _M’)。 In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a brightness difference correction system, which includes: an object-under-test carrying device and a brightness difference correction device. The object-to-be-tested carrying device is used for carrying an image capture module, and the image capture module includes a lens bracket, a lens structure arranged on the lens bracket, and an image sensing chip corresponding to the lens structure. The brightness difference correction device includes a graph display structure, and the graph display structure includes an upper left area graph, a lower left area graph, an upper right area graph, a right lower area graph, a middle area graph and a comparison area graph; wherein, The luminance difference correction system is used to obtain multiple MTF values through the calculation of a modulation transfer function (MTF), and the modulation transfer function conforms to the following formula:

is the minimum brightness value. Wherein, the luminance difference correction system is used to obtain a control area MTF value (G _M ) of the control area chart through the calculation of the modulation transfer function, obtain an original upper left area MTF value (UL _M ) of the upper left area chart, and obtain An original lower left area MTF value (LL _M ) for the lower left area chart, an original upper right area MTF value (UR _M ) for the upper right area chart, and an original lower right area MTF value for the lower right area chart (LR _M ) and get an original middle zone MTF value (CT _M ) of the middle zone chart. Among them, the luminance difference correction system is used to convert the original upper-left region MTF value into a modified upper-left region MTF value (UL _M '), and convert the original lower-left region MTF value into a modified lower-left region MTF value through the comparison region MTF value Region MTF value (LL _M '), convert the original upper-right region MTF value into a revised upper-right region MTF value (UR _M '), convert the original lower-right region MTF value into a modified lower-right region MTF value ( LR _M ') and converting the original mid-region MTF value into a modified mid-region MTF value (CT _M ').

為最小亮度值；亮度差異修正系統用於透過調變轉換函數的計算，以得到對照區域圖表的一對照區域MTF值(G _M)、得到左上區域圖表的一原始的左上區域MTF值(UL _M)、得到左下區域圖表的一原始的左下區域MTF值(LL _M)、得到右上區域圖表的一原始的右上區域MTF值(UR _M)、得到右下區域圖表的一原始的右下區域MTF值(LR _M)以及得到中間區域圖表的一原始的中間區域MTF值(CT _M)；以及，亮度差異修正系統用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值(UL _M’)、將原始的左下區域MTF值轉換為一修正的左下區域MTF值(LL _M’)、將原始的右上區域MTF值轉換為一修正的右上區域MTF值(UR _M’)、將原始的右下區域MTF值轉換為一修正的右下區域MTF值(LR _M’)以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值(CT _M’)。 In order to solve the above 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, a chart display structure of the brightness difference correction system includes an upper left area separated from each other graph, a lower left area graph, an upper right area graph, a lower right area graph, a middle area graph, and a control area graph; the luminance difference correction system is used to obtain multiple MTFs through the calculation of a modulation transfer function (MTF) value, and the modulation transfer function conforms to the following formula:

is the minimum luminance value; the luminance difference correction system is used to obtain a control area MTF value (G _M ) of the control area chart and an original upper left area MTF value (UL _{M )} of the upper left area chart through the calculation of the modulation transfer function. ), get an original lower left area MTF value (LL _M ) of the lower left area chart, obtain an original upper right area MTF value (UR _M ) of the upper right area chart, and obtain an original lower right area MTF value of the lower right area chart (LR _M ) and obtain an original middle region MTF value (CT _M ) of the middle region chart; and, the luminance difference correction system is used to transform the original upper left region MTF value into a corrected upper left region MTF value through the control region MTF value Area MTF value (UL _M '), convert the original lower left area MTF value into a modified left lower area MTF value (LL _M '), convert the original upper right area MTF value into a modified upper right area MTF value (UR _M '), converting the original lower-right region MTF value into a modified lower-right region MTF value (LR _M '), and converting the original middle region MTF value into a modified middle region MTF value (CT _M ').

In order to solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a chart display structure, which includes an upper left area chart, a left lower area chart, an upper right area chart, and a right lower area chart, which are separated from each other. a chart, a middle area chart, and a comparison area chart; wherein, the area of the upper left area chart, the area of the lower left area chart, the area of the upper right area chart, the area of the lower right area chart, and the area of the middle area chart are the same or similar to each other, and The area of the control area chart is between 3 and 10 times larger than the area of the middle area chart.

為最小亮度值”以及“亮度差異修正系統用於透過調變轉換函數的計算，以得到對照區域圖表的一對照區域MTF值、左上區域圖表的一原始的左上區域MTF值、左下區域圖表的一原始的左下區域MTF值、右上區域圖表的一原始的右上區域MTF值、右下區域圖表的一原始的右下區域MTF值以及中間區域圖表的一原始的中間區域MTF值”的技術方案，以使得亮度差異修正系統可以用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值、將原始的左下區域MTF值轉換為一修正的左下區域MTF值、將原始的右上區域MTF值轉換為一修正的右上區域MTF值、將原始的右下區域MTF值轉換為一修正的右下區域MTF值以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值。 One of the beneficial effects of the present invention is that a brightness difference correction system provided by the present invention can be used to carry an image capture module through the "object bearing device to be tested, and the image capture module includes a lens bracket, a set A lens structure on the lens support and an image sensing chip corresponding to the lens structure", "the brightness difference correction device includes a graph display structure, and the graph display structure includes an upper left area graph, a left lower area graph, a The upper right area chart, a lower right area chart, a middle area chart and a control area chart", "the luminance difference correction system is used to obtain multiple MTF values through the calculation of a modulation transfer function (MTF), and the modulation conversion The function conforms to the following formula:

is the minimum luminance value" and "the luminance difference correction system is used through the calculation of the modulation transfer function to obtain a control area MTF value for the control area chart, an original upper left area MTF value for the upper left area chart, and an MTF value for the lower left area chart. Original lower left area MTF value, an original upper right area MTF value of the upper right area chart, an original lower right area MTF value of the lower right area chart, and an original middle area MTF value of the middle area chart", with The luminance difference correction system can be used to convert the original upper-left region MTF value into a modified upper-left region MTF value, convert the original lower-left region MTF value into a modified left-lower region MTF value, and Convert the original upper-right region MTF value to a modified upper-right region MTF value, convert the original lower-right region MTF value to a modified lower-right region MTF value, and convert the original middle region MTF value to a modified middle region MTF value value.

為最小亮度值”以及“亮度差異修正系統用於透過調變轉換函數的計算，以得到對照區域圖表的一對照區域MTF值、左上區域圖表的一原始的左上區域MTF值、左下區域圖表的一原始的左下區域MTF值、右上區域圖表的一原始的右上區域MTF值、右下區域圖表的一原始的右下區域MTF值以及中間區域圖表的一原始的中間區域MTF值”的技術方案，以使得亮度差異修正系統可以用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值、將原始的左下區域MTF值轉換為一修正的左下區域MTF值、將原始的右上區域MTF值轉換為一修正的右上區域MTF值、將原始的右下區域MTF值轉換為一修正的右下區域MTF值以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值。 One of the beneficial effects of the present invention is that a brightness difference correction method provided by the present invention can be achieved by "providing a brightness difference correction system, a graph display structure of the brightness difference correction system includes an upper left area graph separated from each other, a A lower left area graph, an upper right area graph, a lower right area graph, a middle area graph, and a control area graph", "The luminance difference correction system is used to obtain multiple MTF values through the calculation of a modulation transfer function (MTF) , and the modulation transfer function conforms to the following formula:

is the minimum luminance value" and "the luminance difference correction system is used through the calculation of the modulation transfer function to obtain a control area MTF value for the control area chart, an original upper left area MTF value for the upper left area chart, and an MTF value for the lower left area chart. Original lower left area MTF value, an original upper right area MTF value of the upper right area chart, an original lower right area MTF value of the lower right area chart, and an original middle area MTF value of the middle area chart", with The luminance difference correction system can be used to convert the original upper-left region MTF value into a modified upper-left region MTF value, convert the original lower-left region MTF value into a modified left-lower region MTF value, and Convert the original upper-right region MTF value to a modified upper-right region MTF value, convert the original lower-right region MTF value to a modified lower-right region MTF value, and convert the original middle region MTF value to a modified middle region MTF value value.

Another beneficial effect of the present invention is that a graph display structure provided by the present invention can pass "the graph display structure includes an upper left area chart, a left lower area chart, an upper right area chart, and a right lower area chart, which are separated from each other." chart, a middle area chart, and a control area chart", "the area of the upper left area chart, the area of the lower left area chart, the area of the upper right area chart, the area of the lower right area chart, and the area of the middle area chart are the same or similar to each other" and The technical solution of "the area of the chart in the control area is 3 to 10 times larger than the area of the chart in the middle area" enables the chart display structure to be applied to the brightness difference correction system and the brightness difference correction method provided by the present invention.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

The following is a description of the implementation of the "luminance difference correction system, brightness difference correction method, and chart display structure" disclosed by the present invention through specific specific examples. Those skilled in the art can understand the advantages of the present invention from the content disclosed in this specification with effect. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, it should be stated in advance that the drawings of the present invention are only schematic illustrations, and are not drawn according to actual dimensions. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[first embodiment]

Referring to FIGS. 1 to 5 , the first embodiment of the present invention provides a brightness difference correction system S, which at least includes: an object-under-test carrying device 1 and a brightness difference correction device 2 .

First, as shown in FIG. 1 and FIG. 2 , the object-under-test carrying device 1 can be used to carry an image capture module M, and the image capture module M includes a lens mount M1 and a lens mounted on the lens mount M1. The structure M2 and an image sensor chip M3 corresponding to the lens structure M2. In addition, the brightness difference correction device 2 includes a graph display structure 21, and the graph display structure 21 includes an upper left area graph 211 (or the graph area of the upper left part) and a lower left area graph 212 (or the lower left part) that are separated from each other. chart area), an upper right area chart 213 (or the chart area of the upper right part), a right lower area chart 214 (or the chart area of the lower right part), a middle area chart 215 (or the middle part of the chart area area) and a control area chart 216 (or a partial chart area for comparison). For example, the object-under-test carrying device 1 can be any fixing device or a clamping device that can be used to position or fix the image capture module M, and the lens structure M2 can include a protective shell disposed inside the lens holder M1 (not numbered) and at least one lens (or a lens group composed of multiple lenses, not numbered) arranged in the protective casing, and the image sensing chip M3 may be a charge-coupled device (Charge-coupled Device, CCD) Or complementary metal-oxide-semiconductor (Complementary metal-Oxide-Semiconductor, CMOS) sensor. In addition, the brightness difference correction device 2 may also include a data processing module 22 (such as a microprocessor of a computer) electrically connected to the image sensing chip M3 through a circuit substrate (not labeled), and a display structure for carrying a chart. A chart carrying module of 21 (not numbered). It is worth noting that, for example, as shown in FIG. 1 , the chart display structure 21 may be composed of a plurality of small grid areas, and the upper left area chart 211, the lower left area chart 212, the upper right area chart 213, the lower right area chart 214, the middle area Either one of the chart 215 and the comparison area chart 216 may include complete multiple small grid areas, or may include incomplete multiple small grid areas. However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

為最小亮度值。更進一步來說，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到對照區域圖表216的“一對照區域MTF值(G _M)”、得到左上區域圖表211的“一原始的左上區域MTF值(UL _M)”、得到左下區域圖表212的“一原始的左下區域MTF值(LL _M)”、得到右上區域圖表213的“一原始的右上區域MTF值(UR _M)”、得到右下區域圖表214的“一原始的右下區域MTF值(LR _M)”以及得到中間區域圖表215的“一原始的中間區域MTF值(CT _M)”。值得注意的是，舉例來說，調變轉換函數可以儲存於資料處理模組22內，以用於處理透過影像感測晶片M3以從圖表顯示結構21所擷取到的圖表資訊。 Furthermore, as shown in FIG. 1 and FIG. 2, the luminance difference correction system S can be used to obtain multiple MTF values through the calculation of a modulation transfer function (Modulation Transfer Function, MTF), and the modulation transfer function can comply with the following formula:

is the minimum brightness value. Furthermore, the luminance difference correction system S can be used to obtain “a control area MTF value (G _M )” of the control area chart 216 through the calculation of the modulation transfer function, and to obtain “a original Upper left area MTF value (UL _M )", get "an original lower left area MTF value (LL _M )" of the lower left area chart 212, obtain "an original upper right area MTF value (UR _M )" of the upper right area chart 213, Obtain "an original lower right area MTF value (LR _M )" of the lower right area chart 214 and "an original middle area MTF value (CT _M )" of the middle area chart 215 . It should be noted that, for example, the modulation transfer function can be stored in the data processing module 22 for processing the graph information captured from the graph display structure 21 through the image sensor chip M3.

)以及一最小亮度值(

)之後，依據對照區域圖表216的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到對照區域圖表216的對照區域MTF值(G _M)。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the contrast region diagram 216 to obtain a maximum brightness value of the contrast region diagram 216 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the control area chart 216, the luminance difference correction system S can be used to obtain the control area MTF value ( G _M ).

)以及一最小亮度值(

)之後，依據左上區域圖表211的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到左上區域圖表211的原始的左上區域MTF值。藉此，亮度差異修正系統S可以用於透過對照區域MTF值(G _M)，以將原始的左上區域MTF值(UL _M)轉換為一修正的左上區域MTF值(UL _M’)，並且修正的左上區域MTF值可以符合下列公式：UL _M’＝UL _M/G _M。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the upper-left region graph 211 to obtain a maximum brightness value of the upper-left region graph 211 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the upper left area chart 211, the luminance difference correction system S can be used to obtain the original upper left area MTF of the upper left area chart 211 through the calculation of the modulation transfer function value. In this way, the luminance difference correction system S can be used to convert the original upper-left area MTF value (UL _{M ) into a modified upper-left area MTF value (UL M ') through the comparison area MTF value (G M ) ,} and correct The MTF value of the upper left region of can conform to the following formula: UL _M '=UL _M /G _M .

)以及一最小亮度值(

)之後，依據左下區域圖表212的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到左下區域圖表212的原始的左下區域MTF值。藉此，亮度差異修正系統S可以用於透過對照區域MTF值(G _M)，以將原始的左下區域MTF值(LL _M)轉換為一修正的左下區域MTF值(LL _M’)，並且修正的左上區域MTF值可以符合下列公式：LL _M’＝LL _M/G _M。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the lower left region graph 212 to obtain a maximum luminance value of the lower left region graph 212 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the lower left region graph 212, the brightness difference correction system S can be used to obtain the original lower left region MTF of the lower left region graph 212 through the calculation of the modulation transfer function value. In this way, the luminance difference correction system S can be used to convert the original lower-left region MTF value (LL _M ) into a modified lower-left region MTF value (LL _M ') through the comparison region MTF value (G _M ), and correct The MTF value of the upper left region of can conform to the following formula: LL _M '=LL _M /G _M .

)以及一最小亮度值(

)之後，依據右上區域圖表213的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到右上區域圖表213的原始的右上區域MTF值。藉此，亮度差異修正系統S可以用於透過對照區域MTF值(G _M)，以將原始的右上區域MTF值(UR _M)轉換為一修正的右上區域MTF值(UR _M’)，並且修正的右上區域MTF值可以符合下列公式：UR _M’＝UR _M/G _M。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the upper-right region graph 213 to obtain a maximum brightness value of the upper-right region graph 213 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the upper right area chart 213, the luminance difference correction system S can be used to obtain the original upper right area MTF of the upper right area chart 213 through the calculation of the modulation transfer function value. In this way, the luminance difference correction system S can be used to convert the original upper-right region MTF value (UR _M ) into a corrected upper-right region MTF value (UR _M ') through the comparison region MTF value (G _M ), and correct The MTF value of the upper right region of can conform to the following formula: UR _M '=UR _M /G _M .

)以及一最小亮度值(

)之後，依據右下區域圖表214的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到右下區域圖表214的原始的右下區域MTF值。藉此，亮度差異修正系統S可以用於透過對照區域MTF值(G _M)，以將原始的右下區域MTF值(LR _M)轉換為一修正的右下區域MTF值(LR _M’)，並且修正的右下區域MTF值可以符合下列公式：LR _M’＝LR _M/G _M。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the lower-right region graph 214 to obtain a maximum brightness value of the lower-right region graph 214 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the lower right area chart 214, the luminance difference correction system S can be used to obtain the original right Lower area MTF value. In this way, the luminance difference correction system S can be used to convert the original lower-right region MTF value (LR _M ) into a modified lower-right region MTF value (LR _M ') through the comparison region MTF value (G _M ), And the corrected MTF value of the lower right area may conform to the following formula: LR _M ′=LR _M /G _M .

)以及一最小亮度值(

)之後，依據中間區域圖表215的最大亮度值以及最小亮度值所提供的亮度資訊，亮度差異修正系統S可以用於透過調變轉換函數的計算，以得到中間區域圖表215的原始的中間區域MTF值。藉此，亮度差異修正系統S可以用於透過對照區域MTF值(G _M)，以將原始的中間區域MTF值(CT _M)轉換為一修正的中間區域MTF值(CT _M’)，並且修正的中間區域MTF值可以符合下列公式：CT _M’＝CT _M/G _M。 For example, as shown in FIG. 1 and FIG. 2 , when the image sensor chip M3 is used to capture the middle region graph 215 to obtain a maximum brightness value of the middle region graph 215 (

) and a minimum brightness value (

), according to the luminance information provided by the maximum luminance value and the minimum luminance value of the middle region chart 215, the brightness difference correction system S can be used to obtain the original middle region MTF of the middle region diagram 215 through the calculation of the modulation transfer function value. In this way, the luminance difference correction system S can be used to convert the original mid-region MTF value (CT M ) into a modified mid-region MTF value (CT _{M '} ) through the contrast region MTF value (G _M ), and correct The MTF value of the middle region of can conform to the following formula: CT _M '=CT _M /G _M .

In this way, the luminance difference correction system S can be used for "using the graphic information captured from the graphic display structure 21 through the image sensor chip M3" and "using the modulation transfer function stored in the data processing module 22 to modify the graphic information" 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, and the corrected The MTF value of the upper left region, the modified MTF value of the lower left region, the modified MTF value of the upper right region, the modified MTF value of the lower right region, and the modified MTF value of the middle region. It is worth noting that 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, and the original MTF value of the middle area can be modified respectively. Corrected lower left MTF value, corrected upper right region MTF value, corrected lower right region MTF value, and corrected middle region MTF value are replaced for optical testing to avoid errors caused by original upper left region MTF value, original lower left region MTF value value, the original upper-right area MTF value, the original lower-right area MTF value, and the original middle area MTF value are too small (the problem of too small value due to light attenuation or brightness reduction) causes the lens of the image capture module M to Structure M2 failed optical testing.

For example, as shown in any one of FIGS. 2 to 5 , the middle area chart 215 and the comparison area chart 216 can be located at the upper left area chart 211 , the lower left area chart 212 , the upper right area chart 213 and the lower right area chart 214 between. In addition, the control area chart 216 may be set above the middle area chart 215, and between the upper left area chart 211, the upper right area chart 213 and the middle area chart 215 (as shown in FIGS. 2 and 4); or, The control area chart 216 can also be set below the middle area chart 215 and between the lower left area chart 212 , the lower right area chart 214 and the middle area chart 215 (as shown in FIG. 3 and FIG. 5 ). It should be noted that the comparison area chart 216 can be fixed on the chart display structure 21 , or the comparison area chart 216 is replaceable instead of being fixed on the chart display structure 21 . That is to say, according to different requirements, the comparison area chart 216 can be fixedly or detachably arranged on the chart display structure 21 . However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

For example, as shown in any one of Figures 2 to 5, the upper left area chart 211 is located in the upper left area of the middle area chart 215, the lower left area chart 212 is located in the lower left area of the middle area chart 215, and the upper right area chart 213 is located in the upper right area of the middle area chart 215 , and the lower right area chart 214 is located in the lower right area of the middle area chart 215 . It should be noted that any one of the upper left area graph 211 , the lower left area graph 212 , the upper right area graph 213 , and the lower right area graph 214 has the same shortest distance as the middle area graph 215 . That is to say, relative to the middle area chart 215 , the upper left area chart 211 , the left lower area chart 212 , the right upper area chart 213 and the right lower area chart 214 can be symmetrically arranged on the chart display structure 21 . However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

For example, as shown in any one of FIG. 2 to FIG. 5 , the upper left area chart 211 has a plurality of upper left black areas 211B and a plurality of upper left white areas 211W, and the lower left area chart 212 has a plurality of lower left black areas 212B and A plurality of lower left white areas 212W, an upper right area chart 213 has a plurality of upper right black areas 213B and a plurality of upper right white areas 213W, a lower right area chart 214 has a plurality of lower right black areas 214B and a plurality of lower right white areas 214W, the middle area Chart 215 has a plurality of middle black regions 215B and a plurality of middle white regions 215W, and the contrast region chart 216 has a plurality of contrast black regions 216B and a plurality of contrast white regions 216W (as shown in FIGS. 2 and 3 ), or contrast regions The chart 216 has at least one contrasting black region 216B and at least one contrasting white region 216W (as shown in FIGS. 4 and 5 ). However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

For example, as shown in any one of Figures 2 to 5, the area of the upper left area chart 211, the area of the lower left area chart 212, the area of the upper right area chart 213, the area of the lower right area chart 214, and the middle area The areas of the graphs 215 may be the same or similar to each other. Furthermore, the total area of the plurality of upper left black regions 211B in the upper left region graph 211, the total area of the plurality of lower left black regions 212B in the lower left region graph 212, the total area of the plurality of upper right black regions 213B in the upper right region graph 213, The total area of the plurality of lower right black regions 214B of the lower right region graph 214 and the total area of the plurality of middle black regions 215B of the middle region graph 215 may be the same or similar to each other. In addition, the total area of the plurality of upper left white regions 211W in the upper left region graph 211, the total area of the plurality of lower left white regions 212W in the lower left region graph 212, the total area of the plurality of upper right white regions 213W in the upper right region graph 213, and the lower right region The total area of the plurality of lower right white regions 214W of the graph 214 and the total area of the plurality of middle white regions 215W of the middle region graph 215 may be the same or similar to each other. However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

For example, as shown in any one of FIGS. 2 to 5 , the area of the control area chart 216 may be 3 to 10 times larger than the area of the middle area chart 215 . Furthermore, the area of at least one contrasting black region 216B of the contrasting region chart 216 or the total area of a plurality of contrasting black regions 216B of the contrasting region chart 216 may be greater than the total area of a plurality of middle black regions 215B of the middle region chart 215 Between 3 and 10 times. In addition, the area of at least one contrasting white region 216W of the contrasting region chart 216 or the total area of the plurality of contrasting white regions 216W of the contrasting region chart 216 may be 3 to 10 greater than the total area of the plurality of intermediate white regions 215W of the intermediate region chart 215 . between times. However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention.

[Second embodiment]

為最小亮度值；然後，亮度差異修正系統S用於透過調變轉換函數的計算，以得到對照區域圖表216的一對照區域MTF值(G _M)、得到左上區域圖表211的一原始的左上區域MTF值(UL _M)、得到左下區域圖表212的一原始的左下區域MTF值(LL _M)、得到右上區域圖表213的一原始的右上區域MTF值(UR _M)、得到右下區域圖表214的一原始的右下區域MTF值(LR _M)以及得到中間區域圖表215的一原始的中間區域MTF值(CT _M)（步驟S104）；接下來，亮度差異修正系統S用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值(UL _M’)、將原始的左下區域MTF值轉換為一修正的左下區域MTF值(LL _M’)、將原始的右上區域MTF值轉換為一修正的右上區域MTF值(UR _M’)、將原始的右下區域MTF值轉換為一修正的右下區域MTF值(LR _M’)以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值(CT _M’)（步驟S106）。 Referring to FIG. 1 to FIG. 6 , the second embodiment of the present invention provides a brightness difference correction method. The main difference between the second embodiment of the present invention and the first embodiment is that the brightness difference correction method provided by the second embodiment of the present invention includes at least the following steps: first, a brightness difference correction system S is provided, and the brightness difference correction A graph display structure 21 of the system S comprises an upper left region graph 211, a lower left region graph 212, an upper right region graph 213, a lower right region graph 214, a middle region graph 215 and a comparison region graph 216 separated from each other (step S100); Next, the brightness difference correction system S is used to obtain multiple MTF values through the calculation of a modulation transfer function (MTF) (step S102), and the modulation transfer function conforms to the following formula:

is the minimum luminance value; then, the luminance difference correction system S is used to obtain a control area MTF value (G _M ) of the control area chart 216 through the calculation of the modulation transfer function, and obtain an original upper left area of the upper left area chart 211 MTF value (UL _M ), obtain an original lower left area MTF value (LL _M ) of the lower left area chart 212, obtain an original upper right area MTF value (UR _M ) of the upper right area chart 213, obtain the lower right area chart 214 An original lower right area MTF value (LR _M ) and an original middle area MTF value (CT _M ) obtained from the middle area chart 215 (step S104); Next, the luminance difference correction system S is used to pass through the comparison area MTF value , to convert the original upper-left MTF value into a modified upper-left MTF value (UL _M '), convert the original lower-left MTF value into a modified lower-left MTF value (LL _M '), and convert the original upper-right Convert the region MTF value to a modified upper-right region MTF value (UR _M '), convert the original lower-right region MTF value to a modified lower-right region MTF value (LR _M '), and convert the original middle region MTF value is a corrected middle area MTF value (CT _M ') (step S106).

In this way, the luminance difference correction system S can be used for "using the graphic information captured from the graphic display structure 21 through the image sensor chip M3" and "using the modulation transfer function stored in the data processing module 22 to modify the graphic information" 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, and the corrected The MTF value of the upper left region, the modified MTF value of the lower left region, the modified MTF value of the upper right region, the modified MTF value of the lower right region, and the modified MTF value of the middle region. It is worth noting that 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, and the original MTF value of the middle area can be modified respectively. Corrected lower left MTF value, corrected upper right region MTF value, corrected lower right region MTF value, and corrected middle region MTF value are replaced for optical testing to avoid errors caused by original upper left region MTF value, original lower left region MTF value value, the original upper-right area MTF value, the original lower-right area MTF value, and the original middle area MTF value are too small (the problem of too small value due to light attenuation or brightness reduction) causes the lens of the image capture module M to Structure M2 failed optical testing.

[Advantageous Effects of Embodiment]

為最小亮度值”以及“亮度差異修正系統S用於透過調變轉換函數的計算，以得到對照區域圖表216的一對照區域MTF值、左上區域圖表211的一原始的左上區域MTF值、左下區域圖表212的一原始的左下區域MTF值、右上區域圖表213的一原始的右上區域MTF值、右下區域圖表214的一原始的右下區域MTF值以及中間區域圖表215的一原始的中間區域MTF值”的技術方案，以使得亮度差異修正系統S可以用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值、將原始的左下區域MTF值轉換為一修正的左下區域MTF值、將原始的右上區域MTF值轉換為一修正的右上區域MTF值、將原始的右下區域MTF值轉換為一修正的右下區域MTF值以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值。 One of the beneficial effects of the present invention is that a brightness difference correction system S provided by the present invention can be used to carry an image capture module M through "the object carrying device 1 to be tested, and the image capture module M includes a The lens holder M1, a lens structure M2 arranged on the lens holder M1, and an image sensing chip M3 corresponding to the lens structure M2", "the brightness difference correction device 2 includes a graph display structure 21, and the graph display structure 21 includes separate An upper left area chart 211, a lower left area chart 212, an upper right area chart 213, a lower right area chart 214, a middle area chart 215, and a contrast area chart 216", "brightness difference correction system S is used to adjust The calculation of the variable transfer function (MTF) is used to obtain multiple MTF values, and the modulation transfer function conforms to the following formula:

is the minimum luminance value" and "the luminance difference correction system S is used to calculate the modulation transfer function to obtain a control area MTF value of the control area chart 216, an original upper left area MTF value of the left upper area chart 211, and a lower left area An original lower left region MTF value for graph 212, an original upper right region MTF value for upper right region graph 213, an original lower right region MTF value for lower right region graph 214, and an original middle region MTF for middle region graph 215 Value" technical solution, so that the brightness difference correction system S can be used to convert the original upper left area MTF value into a modified upper left area MTF value, and convert the original lower left area MTF value into a Corrected lower left region MTF value, convert original upper right region MTF value to a modified upper right region MTF value, convert original lower right region MTF value to a modified lower right region MTF value and convert original middle region MTF value Converted to a modified mid-region MTF value.

為最小亮度值”以及“亮度差異修正系統S用於透過調變轉換函數的計算，以得到對照區域圖表216的一對照區域MTF值、左上區域圖表211的一原始的左上區域MTF值、左下區域圖表212的一原始的左下區域MTF值、右上區域圖表213的一原始的右上區域MTF值、右下區域圖表214的一原始的右下區域MTF值以及中間區域圖表215的一原始的中間區域MTF值”的技術方案，以使得亮度差異修正系統S可以用於透過對照區域MTF值，以將原始的左上區域MTF值轉換為一修正的左上區域MTF值、將原始的左下區域MTF值轉換為一修正的左下區域MTF值、將原始的右上區域MTF值轉換為一修正的右上區域MTF值、將原始的右下區域MTF值轉換為一修正的右下區域MTF值以及將原始的中間區域MTF值轉換為一修正的中間區域MTF值。 One of the beneficial effects of the present invention is that a method for correcting brightness difference provided by the present invention can be achieved by "providing a brightness difference correction system S, and a graph display structure 21 of the brightness difference correction system S includes an upper left area separated from each other Chart 211, a left lower area chart 212, a right upper area chart 213, a right lower area chart 214, a middle area chart 215 and a contrast area chart 216", "brightness difference correction system S is used to pass a modulation transfer function ( MTF) to obtain multiple MTF values, and the modulation transfer function conforms to the following formula:

is the minimum luminance value" and "the luminance difference correction system S is used to calculate the modulation transfer function to obtain a control area MTF value of the control area chart 216, an original upper left area MTF value of the left upper area chart 211, and a lower left area An original lower left region MTF value for graph 212, an original upper right region MTF value for upper right region graph 213, an original lower right region MTF value for lower right region graph 214, and an original middle region MTF for middle region graph 215 Value" technical solution, so that the brightness difference correction system S can be used to convert the original upper left area MTF value into a modified upper left area MTF value, and convert the original lower left area MTF value into a Corrected lower left region MTF value, convert original upper right region MTF value to a modified upper right region MTF value, convert original lower right region MTF value to a modified lower right region MTF value and convert original middle region MTF value Converted to a modified mid-region MTF value.

Another beneficial effect of the present invention is that a kind of chart display structure 21 provided by the present invention can pass "the chart display structure 21 comprises an upper left area chart 211, a left lower area chart 212, and a right upper area chart 213 separated from each other." , a lower right area chart 214, a middle area chart 215 and a contrast area chart 216", "the area of the upper left area chart 211, the area of the lower left area chart 212, the area of the upper right area chart 213, the area of the lower right area chart 214 And the areas of the middle area chart 215 are the same or close to each other" and the technical solutions of "the area of the control area chart 216 is 3 to 10 times larger than the area of the middle area chart 215", so that the chart display structure 21 can be applied to this The invention provides a brightness difference correction system S and a brightness difference correction method.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

S: Brightness difference correction system 1: Object carrying device to be tested 2: Brightness difference correction device 21: Diagram showing structure 211: Upper left area chart 211B: upper left black area 211W: upper left white area 212: Lower left area chart 212B: the lower left black area 212W: lower left white area 213: Upper right area chart 213B: upper right black area 213W: upper right white area 214: Lower right area chart 214B: lower right black area 214W: lower right white area 215: Middle area chart 215B: middle black area 215W: middle white area 216: Control area chart 216B: Control black area 216W: Control white area 22: Data processing module M: Image capture module M1: lens holder M2: lens structure M3: Image sensor chip

FIG. 1 is a schematic diagram of a brightness difference correction system provided by the present invention.

FIG. 2 is a schematic diagram of the first graph display structure provided by the brightness difference correction device of the present invention.

FIG. 3 is a schematic diagram of a second graph display structure provided by the brightness difference correction device of the present invention.

FIG. 4 is a schematic diagram of a third graph display structure provided by the brightness difference correction device of the present invention.

FIG. 5 is a schematic diagram of a fourth graph display structure provided by the brightness difference correction device of the present invention.

FIG. 6 is a flow chart of the brightness difference correction method provided by the present invention.

21: Diagram showing structure

211: Upper left area chart

211B: upper left black area

211W: upper left white area

212: Lower left area chart

212B: the lower left black area

212W: lower left white area

213: Upper right area chart

213B: upper right black area

213W: upper right white area

214: Lower right area chart

214B: lower right black area

214W: lower right white area

215: Middle area chart

215B: middle black area

215W: middle white area

216: Control area chart

216B: Control black area

216W: Control white area

Claims (10)

A brightness difference correction system, which includes: an object-under-test carrying device, the object-under-test carrying device is used to carry an image capture module, the image capture module includes a lens bracket, arranged on the lens A lens structure on the bracket and an image sensing chip corresponding to the lens structure; and a brightness difference correction device, the brightness difference correction device includes a graph display structure, and the graph display structure includes an upper left part separated from each other area chart, a lower left area chart, an upper right area chart, a right lower area chart, a middle area chart and a comparison area chart; wherein the brightness difference correction system is used for calculation through a modulation transfer function (MTF) To obtain multiple MTF values, and the modulation transfer function conforms to the following formula: MTF=[( I _max - I _min )/( I _max + I _min )]×100%, where I _max is the maximum brightness value, I _min is the minimum brightness value; wherein, the brightness difference correction system is used to obtain a control area MTF value (G _M ) of the control area chart through the calculation of the modulation transfer function, and obtain the upper left area chart an original upper-left area MTF value (UL _M ), obtain an original lower-left area MTF value (LL _M ) of the lower-left area chart, and obtain an original upper-right area MTF value (UR _M ) of the upper-right area chart , obtaining an original lower right region MTF value (LR _M ) of the lower right region chart and obtaining an original middle region MTF value (CT _M ) of the middle region chart; wherein, the brightness difference correction system uses Through the MTF value of the control area, the original upper left area MTF value is converted into a modified upper left area MTF value (UL _M '), and the original lower left area MTF value is converted into a modified lower left area MTF value (LL _M '), converting the original upper right region MTF value into a modified upper right region MTF value (UR _M '), converting the original lower right region MTF value into a modified lower right region MTF value (LR _M ') and converting the original mid-region MTF value into a modified mid-region MTF value (CT _M '). The luminance difference correction system according to claim 1, wherein the luminance difference correction device includes a data processing module with the modulation transfer function stored in it, for processing the data extracted from the graph display structure 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 middle region MTF value, the modified upper left region MTF value, the modified lower left region MTF value, the modified upper right region MTF value, the modified lower right region MTF value and the modified Middle area MTF value; wherein, the MTF value of the upper left area of the correction conforms to the following formula: UL _M '=UL _M /G _M ; wherein, the MTF value of the upper left area of the amendment conforms to the following formula: LL _M '=LL _M / G _M ; wherein, the revised MTF value of the upper right area conforms to the following formula: UR _M '=UR _M /G _M ; wherein, the revised MTF value of the lower right area conforms to the following formula: LR _M '=LR _M /G _M ; wherein, the corrected MTF value of the middle region conforms to the following formula: CT _M '=CT _M /G _M . The luminance difference correction system according to claim 1, wherein when the image sensor chip is used to capture the comparison area chart After obtaining a maximum brightness value and a minimum brightness value of the comparison area chart, according to the maximum brightness value and the minimum brightness value of the comparison area chart, the brightness difference correction system is used to adjust Calculation of a transfer function to obtain the contrast area MTF value of the contrast area chart; wherein, when the image sensor chip is used to capture the upper left area chart to obtain a maximum brightness of the upper left area chart value and a minimum brightness value, according to the maximum brightness value and the minimum brightness value of the upper left area graph, the brightness difference correction system is used to obtain the upper left The original upper-left area MTF value of the area chart; wherein, when the image sensor chip is used to capture the lower-left area chart to obtain a maximum brightness value and a minimum brightness value of the lower-left area chart, According to the maximum luminance value and the minimum luminance value of the lower left region graph, the brightness difference correction system is used to obtain the original lower left region graph through the calculation of the modulation transfer function. Regional MTF value; wherein, after the image sensor chip is used to capture the upper right region graph to obtain a maximum brightness value and a minimum brightness value of the upper right region graph, according to the value of the upper right region graph The maximum luminance value and the minimum luminance value, the luminance difference correction system is used to obtain the original upper right area MTF value of the upper right area chart through the calculation of the modulation transfer function; wherein, when the After the image sensing chip is used to capture the lower right area graph to obtain a maximum brightness value and a minimum brightness value of the lower right area graph, according to the maximum brightness value and the minimum brightness value of the lower right area graph The minimum luminance value, the luminance difference correction system is used to convert through the modulation Calculation of conversion function to obtain the original lower right region MTF value of the lower right region graph; wherein, when the image sensing chip is used to capture the middle region graph to obtain the middle region graph After a maximum luminance value and a minimum luminance value, according to the maximum luminance value and the minimum luminance value of the middle region chart, the luminance difference correction system is used to calculate the modulation transfer function to Obtaining the original middle region MTF value of the middle region graph. The brightness difference correction system according to claim 1, wherein the middle area chart and the comparison area chart are located in the upper left area chart, the lower left area chart, the upper right area chart and the lower right area chart , and the control area chart is located between the upper left area chart, the upper right area chart and the middle area chart, or between the lower left area chart, the lower right area chart and the middle Between the three area charts; wherein, the upper left area chart is located in the upper left area of the middle area chart, the lower left area chart is located in the lower left area of the middle area chart, and the upper right area chart is located in the middle The upper right area of the area chart, the lower right area chart is located in the lower right area of the middle area chart, and the upper left area chart, the lower left area chart, the upper right area chart and the lower right area chart Any one of them has the same shortest distance with the middle region diagram; wherein, the upper left region diagram has a plurality of upper left black regions and a plurality of upper left white regions, and the lower left region diagram has a plurality of lower left black regions and a plurality of lower left white areas, the upper right area graph has a plurality of upper right black areas and a plurality of upper right white areas, the lower right area chart has a plurality of a lower right black area and a plurality of lower right white areas, the middle area diagram has a plurality of middle black areas and a plurality of middle white areas, and the comparison area chart has at least one contrast black area and at least one contrast white area, Or the control area chart has a plurality of contrast black areas and a plurality of contrast white areas; wherein, the total area of the plurality of the upper left black areas of the upper left area chart, the plurality of the lower left black areas of the lower left area chart The total area of the region, the total area of the plurality of the upper right black regions of the upper right region graph, the total area of the plurality of the lower right black regions of the lower right region graph, and the plurality of all of the middle region graphs The total areas of the middle black areas are the same or close to each other, and the area of the at least one contrast black area of the comparison area chart or the total area of a plurality of the contrast black areas of the comparison area chart is larger than the middle area The total area of the plurality of middle black areas of the graph is greater than 3 to 10 times; wherein, the total area of the plurality of the upper left white areas of the upper left area graph, the plurality of the lower left areas of the lower left area graph The total area of the white area, the total area of the plurality of the upper right white areas of the upper right area graph, the total area of the plurality of the lower right white areas of the lower right area graph, and the plurality of the middle area graphs The total areas of the middle white areas are the same or similar to each other, and the area of the at least one contrast white area of the comparison area chart or the total area of a plurality of the contrast white areas of the comparison area chart is larger than the middle area. The total area of the multiple middle white areas of the area chart is greater than 3 to 10 times. A brightness difference correction method, which includes: providing a brightness difference correction system, a graph display structure of the brightness difference correction system includes an upper left area graph, a left lower area graph, an upper right area graph, and a right lower area A chart, a middle area chart, and a contrast area chart; the brightness difference correction system is used to obtain multiple MTF values through the calculation of 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 is the maximum brightness value, and I _min is the minimum brightness value; the brightness difference correction system is used to pass through the modulation Calculation of conversion functions to obtain a control area MTF value (G _M ) of the control area chart, an original upper left area MTF value (UL M ) of the upper left area chart, and a control area MTF value (UL _M ) of the lower left area chart The original lower left area MTF value (LL _M ), get an original upper right area MTF value (UR _M ) of the upper right area chart, get an original lower right area MTF value (LR _M ) of the lower right area chart and obtain an original middle region MTF value (CT _M ) of the middle region chart; and the brightness difference correction system is used to pass through the control region MTF value to convert the original upper left region MTF value into a Revised upper left region MTF value (UL _M '), converting the original lower left region MTF value into a modified left lower region MTF value (LL _M '), converting the original upper right region MTF value into a modified upper right region MTF value (UR _M '), converting the original lower right region MTF value to a modified lower right region MTF value (LR _M ') and converting the original middle region MTF value to a modified MTF value in the middle region (CT _M '). The brightness difference correction method as described in claim 5, wherein the brightness difference correction system includes a data processing module with the modulation transfer function stored in it, for processing the data extracted from the graph display structure 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 middle region MTF value, the modified upper left region MTF value, the modified lower left region MTF value, the modified upper right region MTF value, the modified lower right region MTF value and the modified Middle area MTF value; wherein, the MTF value of the upper left area of the correction conforms to the following formula: UL _M '=UL _M /G _M ; wherein, the MTF value of the upper left area of the amendment conforms to the following formula: LL _M '=LL _M / G _M ; wherein, the revised MTF value of the upper right area conforms to the following formula: UR _M '=UR _M /G _M ; wherein, the revised MTF value of the lower right area conforms to the following formula: LR _M '=LR _M /G _M ; wherein, the corrected MTF value of the middle region conforms to the following formula: CT _M '=CT _M /G _M . The brightness difference correction method as described in claim 5, wherein the brightness difference correction method uses an image sensor chip; wherein, when the image sensor chip is used to capture the comparison area chart to obtain the After a maximum luminance value and a minimum luminance value of the comparison area chart, according to the maximum luminance value and the minimum luminance value of the comparison area chart, the brightness difference correction system is used to pass the modulation transfer function calculation to obtain the control area MTF value of the control area chart; wherein, when the image sensor chip is used to capture the upper left area chart to obtain a maximum luminance value of the upper left area chart and a minimum brightness value Afterwards, according to the maximum brightness value and the minimum brightness value of the upper left region graph, the brightness difference correction system is used to obtain the original value of the upper left region graph through the calculation of the modulation transfer function. MTF value of the upper left region; wherein, when the image sensor chip is used to capture the lower left region graph to obtain a maximum brightness value and a minimum brightness value of the lower left region graph, according to the lower left region graph The maximum luminance value and the minimum luminance value, the luminance difference correction system is used to obtain the original lower left region MTF value of the lower left region chart through the calculation of the modulation transfer function; wherein, After the image sensor chip is used to capture the upper right area graph to obtain a maximum brightness value and a minimum brightness value of the upper right area graph, according to the maximum brightness value and the The minimum luminance value, the luminance difference correction system is used to obtain the original upper right area MTF value of the upper right area chart through the calculation of the modulation transfer function; wherein, when the image sensing chip is After acquiring a maximum brightness value and a minimum brightness value of the lower right region graph by extracting the lower right region graph, according to the maximum brightness value and the minimum brightness value of the lower right region graph, The luminance difference correction system is used to obtain the original lower right area MTF value of the lower right area chart through the calculation of the modulation transfer function; wherein, when the image sensor chip is used to capture After obtaining a maximum brightness value and a minimum brightness value of the middle region graph by taking the middle region graph, according to the maximum brightness value and the minimum brightness value of the middle region graph, the brightness difference correction system for obtaining the original middle of the middle region diagram through the calculation of the modulation transfer function The MTF value of the inter-region. The brightness difference correction method according to claim 5, wherein the middle area chart and the comparison area chart are located in the upper left area chart, the lower left area chart, the upper right area chart and the lower right area chart , and the control area chart is located between the upper left area chart, the upper right area chart and the middle area chart, or between the lower left area chart, the lower right area chart and the middle Between the three area charts; wherein, the upper left area chart is located in the upper left area of the middle area chart, the lower left area chart is located in the lower left area of the middle area chart, and the upper right area chart is located in the middle The upper right area of the area chart, the lower right area chart is located in the lower right area of the middle area chart, and the upper left area chart, the lower left area chart, the upper right area chart and the lower right area chart Any one of them has the same shortest distance with the middle region diagram; wherein, the upper left region diagram has a plurality of upper left black regions and a plurality of upper left white regions, and the lower left region diagram has a plurality of lower left black regions and A plurality of lower left white areas, the upper right area chart has a plurality of upper right black areas and a plurality of upper right white areas, the lower right area chart has a plurality of lower right black areas and a plurality of lower right white areas, the middle area chart having a plurality of intermediate black areas and a plurality of intermediate white areas, and the contrast area chart has at least one contrast black area and at least one contrast white area, or the contrast area chart has a plurality of contrast black areas and a plurality of contrast white areas ; Wherein, the total area of the plurality of upper left black areas of the upper left area chart, the total area of the plurality of lower left black areas of the lower left area chart, the The total area of the plurality of upper right black areas in the upper right area chart, the total area of the plurality of lower right black areas in the lower right area chart, and the total area of the plurality of middle black areas in the middle area chart The areas are the same or similar to each other, and the area of the at least one contrasting black area of the comparison area chart or the total area of a plurality of the comparison black areas of the comparison area chart is larger than that of the multiple comparison black areas of the middle area chart. The total area of the middle black area is greater than 3 to 10 times; wherein, the total area of the multiple upper left white areas of the upper left area chart, the total area of the multiple lower left white areas of the lower left area chart, The total area of the plurality of upper right white areas in the upper right area chart, the total area of the plurality of lower right white areas in the lower right area chart, and the area of the plurality of middle white areas in the middle area chart The total areas are the same or close to each other, and the area of the at least one contrasting white area of the comparison area chart or the total area of the plurality of comparison white areas of the comparison area chart is larger than that of the multiple comparison white areas of the middle area chart. The total area of the middle white area is greater than 3 to 10 times. A graph display structure, the graph display structure includes an upper left area graph, a lower left area graph, an upper right area graph, a lower right area graph, a middle area graph and a comparison area graph that are separated from each other; wherein, the upper left The area of the area chart, the area of the lower left area chart, the area of the upper right area chart, the area of the lower right area chart and the area of the middle area chart are the same or similar to each other, and the area of the comparison area chart 3 to 10 times larger than the area of the middle area chart; wherein, the middle area chart and the control area chart are located in the upper left area chart, the lower left area chart, the upper right area chart and the Between the lower right area charts, and the control area chart is located in the upper left area chart, Between the upper right area chart and the middle area chart, or between the lower left area chart, the lower right area chart and the middle area chart. The chart display structure according to request item 9, wherein the upper left area chart is located in the upper left area of the middle area chart, the lower left area chart is located in the lower left area of the middle area chart, and the upper right area chart is Located in the upper right area of the middle area chart, the lower right area chart is located in the lower right area of the middle area chart, and the upper left area chart, the lower left area chart, the upper right area chart and the right There is the same shortest distance between any one of the four diagrams in the lower area and the middle area diagram; wherein, the upper left area diagram has a plurality of upper left black areas and a plurality of upper left white areas, and the lower left area diagram has a plurality of The lower left black area and a plurality of lower left white areas, the upper right area chart has a plurality of upper right black areas and a plurality of upper right white areas, the lower right area chart has a plurality of lower right black areas and a plurality of lower right white areas, so The middle area chart has a plurality of middle black areas and a plurality of middle white areas, and the contrast area chart has at least one contrast black area and at least one contrast white area, or the contrast area chart has a plurality of contrast black areas and a plurality of a contrast white area; wherein, the total area of the plurality of the upper left black areas of the upper left area chart, the total area of the plurality of the lower left black areas of the lower left area chart, and the plurality of all the upper left black areas of the upper right area chart The total area of the upper right black area, the total area of the plurality of the lower right black areas of the lower right area chart, and the total area of the plurality of the middle black areas of the middle area chart are the same or similar to each other, and the Said at least one contrasting black area of said contrasting area chart The area of the domain or the total area of the plurality of contrast black areas of the control area chart is greater than the total area of the plurality of the middle black areas of the middle area chart between 3 and 10 times; wherein, the upper left The total area of the plurality of upper left white areas in the area graph, the total area of the plurality of lower left white areas in the lower left area graph, the total area of the plurality of upper right white areas in the upper right area graph, the The total area of the plurality of lower right white areas of the lower right area chart and the total area of the plurality of middle white areas of the middle area chart are the same or similar to each other, and the at least one comparison of the comparison area chart The area of the white area or the total area of the multiple control white areas in the control area chart is 3 to 10 times larger than the total area of the multiple intermediate white areas in the middle area chart.

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