TW200942017A - Image capturing device and setting unit and method for gaining tables thereof - Google Patents

Abstract

The present invention relates to a setting unit for gaining tables. The setting unit is used to compensate a first raw image and a second raw image captured by an image capturing device. The setting unit includes an area dividing sub-unit, an average-value calculating sub-unit, a selecting sub-unit and a gain calculating sub-unit. The area dividing sub-unit divides the first raw image into a plurality of first sub-areas. The average-value calculating sub-unit calculates first red average luminance values, first green average luminance values and first blue average luminance values of each first sub-areas. The selecting sub-unit selects the biggest red average luminance value from the first red average luminance values, the biggest green average luminance value from the first green average luminance values, and the biggest blue average luminance value from the first blue average luminance values. The gain calculating sub-unit calculates red luminance gains, green luminance gains and blue luminance gains of each first sub-areas in order to get a gaining table of a red channel, a gaining table of a green channel and a gaining table of a blue channel. The gain calculating sub-unit inputs the gaining table of the red channel, the gaining table of the green channel and the gaining table of the blue channel into the image capturing device to compensate the second raw image. The present invention also relates to a setting method for gaining tables and an image capturing device using the same.

Description

The invention relates to an image processing technology, and in particular to a gain form establishing unit and a setting method, and an image capturing device having the gain form establishing unit. [Prior Art] At present, the lens used in the image capture device on the market is not uniform. Some lenses will have different brightness ratios depending on the ratio of the center of the lens to the periphery of the lens. When low, the periphery cannot obtain the brightness corresponding to the center, which is usually dark, that is, the lens shadowing effect is generated, which will cause a certain shadow on the image quality. In view of this, the present invention provides a gain form building unit and Method 8 is established to establish a gain form that compensates for the lens shading effect of the image. The present invention also provides a mirror-shading effect with the image acquisition means (4) having the gain form establishing unit (4), and the gain form (4) of the image capturing device is compensated to ensure image quality. A gain form establishing unit is configured to establish a gain table to capture the image and the mth image. The addition table early establishment early element includes a region division subunit, a parity: ... selection subunit, and a = molecular unit to divide the first-original image into multiple; Buckle domain. The average value is calculated as the sub-single μ (4)/original 200942017 1st image of each of the first sub-region pixels, the first-red average luminance value, the first-color average luminance value, and the first-blue average luminance value. The selection sub-level is used to select a maximum uniform luminance value from the plurality of first red average luminance values, and select a maximum blue luminance average luminance value from a plurality of first and green average luminance values. Selecting a maximum et et 鼻子 鼻子 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀 兀a red luminance gain of the sub-region to obtain: a glow=form, according to the maximum green average luminance value and the first green average luminance value of each of the::sub-region pixels, each first === , in order to obtain a luminance gain form of the green channel, the root luminance value and the 平均f-blue average luminance value of each of the first sub-region pixels, calculate the blue luminance increase of each first sub-region Taking a luminance gain form of the blue channel, and outputting a luminance addition sheet of the red channel, a luminance gain form of the green channel, and a luminance gain form of the blue channel to the image capturing device for the image The couch device is invoked to compensate for the second original image. a gain form establishing method, comprising the steps of: acquiring a first original f image; dividing the first original image into a plurality of first sub-regions; respectively calculating each of the first-original images a first red average luminance value, a first-green average luminance value, and a first-blue average luminance value of a sub-region pixel; a maximum red average luminance value selected from the plurality of the first-red average luminance values Selecting a maximum green average luminance value from the first green average luminance values, and selecting a maximum 200942017 2 average luminance value from the plurality of first blue average luminance values; according to the maximum red flatness value and the a first-red average luminance value of each of the first-sub-region pixels, and calculating a first-and-green luminance gain value according to the most-colored average luminance value and the first-green average luminance of the sub- & domain pixels a value, a green luminance gain of each of the :: regions is calculated, and a blue luminance of each of the first sub-regions is calculated according to the maximum blue blue; the first-blue average luminance value of each of the first-sub-region pixels Gain; according to The color luminance gain blue luminance is increased by 0. The luminance of the red channel is increased. The luminance gain form of the green channel is as follows: Table: the luminance gain form of the red channel, the green channel: the table ^ and the blue channel A luminance gain form is sent to the image capture device for the image capture device to call. There is an image manipulation device of the gain form creation unit as described above, which includes a mashup unit, a storage unit, and an image acquisition unit for acquiring the first original image and the first Two original images. The storage unit stores the gain of the red channel of the single 7G output, the benefit form, and the luminance gain form of the blue channel. The two colors=P are divided into the first sub-regions of the first sub-division of the first-sub-division divided by the same as the first sub-division, and the pixels of the second sub-region are respectively calculated. The second red average luminance value, the -: Γ 22 = average luminance value 'calls the luminance increase of the red channel: Table early, the luminance gain form of the # color channel, and the luminance gain table of the blue channel 200942017 ί The red luminance gain of the channel luminance increasing single towel is multiplied by the corresponding second sub-region of the parent image, such as the red pass luminance, and the value of the color is the green color of the color-increasing two-color shirt: ΐ辉二f performs green channel luminance compensation with the corresponding second greenness gain of each of the second sub-region pixels, and multiplies the blue luminance gain in the blue channel hui: 曰皿·¥ The second blue average luminance value of each of the second sub-region pixels is compensated for blue channel luminance. ...the image processing device and its gain form are established earlier than the prior art, and the method for establishing, using the first color of the first original image, the work color luminance gain, the green luminance gain And the blue luminance gain form forms a red channel rotation gain form, a green channel luminance gain form, and a blue channel luminance gain form, respectively, for the image capturing device to acquire the image week each time using the above form to the image The luminance complement compensates to compensate for the lens shadowing effect and ensure image quality. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. FIG. 1 is a gain form establishing unit 10 for establishing a gain form to compensate for a first original image acquired by the image capturing device 20 (shown in FIG. 4) due to lens quality reasons. The shadowing effect caused by the original image. The gain form establishing unit 10 includes a region dividing sub-unit 12, an average calculating sub-unit 14, a selecting sub-unit 16, a gain calculating sub-unit 18, and a comparing sub-unit 19. The area dividing sub-unit 12 is configured to divide the first original image into 200942017 as a plurality of first sub-areas, which is n in the present embodiment. The average value calculation sub-unit 14 is configured to respectively calculate a first red average luminance value Ri, a first green average luminance value Gi, and a first blue color of each first sub-region pixel of the first original image. The average luminance value is Βί(ί=1,...η). The selecting subunit 16 is configured to select a maximum red average luminance value Rmax from the plurality of first red average luminance values Ri, and select a largest green average luminance value from the plurality of first green average luminance values Gi. Gmax, the largest blue average luminance value Bmax is selected from the plurality of first blue average luminance values. The gain calculation sub-unit 18 is configured to respectively calculate a red luminance gain Kri of each first sub-region to obtain a luminance gain form of the red channel, and a green luminance gain Kgi of each first sub-region to obtain a green channel The luminance gain form, the blue luminance gain Kbi of each first sub-region, yields a luminance gain form for the blue channel. The gain calculation sub-unit 18 outputs a luminance gain form of the red channel, a luminance gain form of the green channel, and a luminance gain form of the blue channel to the image capturing device 20 (shown in FIG. 4) for supply The image capture device 20 (shown in Figure 4) invokes compensation for the second original image. The comparison subunit 19 is pre-set with a gain range for comparing whether the gains Kri, Kgi, and 1^1 are within a preset gain range, and if the red luminance gain, the green luminance gain, and the blue luminance gain are both Output a gain form to form a signal within a preset gain range, and output a clean image capture device lens and image sensing if any of the red luminance gain, the green luminance gain, and the blue luminance gain are not within the preset gain range Component signal. In order to ensure that the image acquired by the image capturing device 20 (shown in FIG. 4) causes excessive noise, it is preferable that the preset gain range in the present embodiment is 1 to 2. Therefore 1 S Kri' 2,1 $ Kgi‘ 2,1 S KbiS 2. If any of the items of Kri, Kgi, and Kbi exceeds 2, it indicates that the lens of the image capturing device 20 (shown in FIG. 4) is not clean or the image sensing element is not clean and needs to be cleaned. Referring to FIG. 2, a method for establishing a gain form according to the present invention includes the following steps: ❹ S100: Acquire a first original image. S102: divide the first original image into a plurality of first sub-regions. S104: Calculate, respectively, a first red average luminance value Ri, a first green average luminance value Gi, and a first blue average luminance value 仏 of each first sub-region pixel of the first original image. S106: Select a maximum red average luminance value Rmax, a maximum green average luminance value Gmax, and a maximum blue average luminance value Bmax from the values of Ri, Gi, and Bi, and calculate a red luminance gain Kri of each first sub-region. , green © color luminance gain Kgi and blue luminance gain Kbi. Where KrfRn^/Ri, Kgi — Gmax/Gi, Kbi — Bmax/Bi 〇 S108 : Compare whether the gains Kri, Kgi, Kbi are within a preset gain range. If any one of the gains Kri, Kgi, and Kbi is not within the preset gain range, step S114 is performed: cleaning the image capturing device lens and the image sensing element, and then returning to step S100, if the gains Kri, Kgi, and Kbi are all in advance In the gain range, step S110 is performed: a luminance gain form of a red channel, a luminance gain form of a green channel, and a luminance gain form of a blue channel are respectively formed according to the gains Kd, Kgi, and Kbi. 12 200942017 S112: outputting the luminance gain form of the red channel, the green, := and the luminance gain form of the blue channel to the image 掏 In order to clearly illustrate the gain form establishment method provided by the present invention, 浐=', obtain ^ After the first round image, the first round image is divided into 111 to one six; j -, and the first six sub-regions of U l23 are calculated in turn.

Flat, value...6, first green average luminance 仏 to two: color - blue average luminance value m6. From 1 to J, the value, the maximum green average === from Gl... to the maximum blue average luminance value in the heart, for example, the luminance gain of the red channel of the six first-sub-regions of R3 and =3, respectively. K = P Kr2 ~ ~ R3 / R2 ' Kr3 = R3 / R3 > Kr4 = R3 / R4 . Kr5 = R3 / R5 , / - is . The luminance gain of the green channel is ^ = 分别

3 2 ' Kg3 = G3/G3 ' Kg4 = G3/G4 ' Κ ς = G /Γ V 辉 The luminance of the blue channel ~ two f g5 3/G5, Kg6 = G3/G6. The luminance increase is Kbi = B3/Bi, Kb2 = B3/B2, Table 3, Kb4 = B3/B4, Kb5 == B3/B5, Kb6 = B3/B6. Specific reference

13 200942017 .^ ^ ^ ^ ο An image capture device of Windshield 20 'its two orders -26: two take early .22, one storage unit 24, one central location 猝 箪 箪-22 Μ Gain form creation unit 1G. The image is the first original image and the second original image. The storage ... is used to store a luminance gain form of the red channel from the output, a luminance wanted form of the green overnight, and a luminance gain form of the blue channel. The m luminance ^ is divided into the first sub-divided with the first original image by the division (4) image of the sub-unit 12

G

Til____ Β4 Kb 4 "85 β5 Kb5 ^g6 β6 Kb6 β3 ΐ==' respectively calculate the second red average luminance value Ri of each of the first: sub & domain pixels of the second original image, The average of the two greens = the table and the single number; The average luminance value...calls the red luminance increase in %, the luminance gain form of the green channel, and the blueness gain form 'sample the red color _ degree increase single towel (10) color gain gain Kd multiplied by the corresponding The second red == table R:: of each second sub-region pixel performs red channel luminance compensation, multiplying the green luminance gain Kgi of the green channel: a table by the corresponding per-degree centimeter, The blue Kbi in the luminance gain form of the blue channel is multiplied by the corresponding second blue 200942017 degree value Bi' of each of the second sub-region pixels to perform blue channel luminance compensation. See FIG. 5, For the image capturing device of the present invention, the second original image is compensated for the step of flow chart / / stomach table form pair S116: obtaining the second original image. S118: with the area Subdividing the second good picture into eight "the same partitioning form will sub-area--a plurality of second sub-areas. - ❹ SU0 of the knive: calculating each (four) == color average luminance value & respectively, of the second original image, and the luminance increase form of the red material of the second green domain benefit form for three-channel luminance compensation . ^ Increase the brightness of the red channel mm2 A body compensation is as follows: multiply the temple from the red luminance gain Kri of the early morning of the increase table to the pair, '[the second red average luminance value Ri of the second sub-region pixel) With the compensation of ❹. Multiplying the blue luminance gain ^ in the = pass = luminance gain form of the second green color of the green channel's luminance gain form by the second green $" multiply ^ corresponding to the corresponding parent side a second blue average luminance value of the area pixel for performing blue channel luminance compensation. The image capturing apparatus and the gain form establishing unit and method thereof provided by the present invention utilize each of the first original image a sub-area = color luminance gain, green luminance gain, and blue luminance gain respectively form a channel brightness increase order, a green channel_metric form, and a blue 15 200942017 color channel luminance gain form for the image capture device Each time the image is acquired, the above-mentioned form is called to compensate for the image luminance, thereby compensating for the lens shadowing effect and ensuring the image quality. In summary, the present invention has indeed met the patent requirements of the invention, and has filed a patent application according to law. The above is only a preferred embodiment of the present invention, and those skilled in the art will be equivalently modified or modified in the spirit of the invention. All of them should be included in the following patent application. ^ [Simple description of the drawings] Figure 1 is a block diagram of the gain form building unit of the present invention. Figure 2 is a flow chart of the steps of the method for establishing a gain form according to the present invention. Fig. 4 is a schematic diagram of a video capture device of the present invention. Fig. 5 is a flow chart of the steps of the image capture device of the present invention for calling a gain form. [Description of main component symbols] Gain form creation unit 10 Area division sub-unit 12 Average calculation sub-unit 14 Selection sub-unit 16 Gain calculation sub-unit 18 Comparison sub-unit 19 Image capture device 20 Image acquisition unit 22 Storage unit 24 Central processing unit 26 16

Claims (1)

200942017 X. Patent application scope, 1. A gain form establishing unit, which is configured to establish a gain form to compensate a first original image and a second original image acquired by the image capturing device, the benefit form establishing unit comprising: gjnL a region dividing sub-unit for dividing the first original image into a first sub-region; An average calculation subunit, wherein the ribs respectively calculate a first red average luminance value, a first green average luminance value, and a first blue average luminance value of each of the first sub-region pixels of the first original image; a selection subunit for selecting a maximum red average luminance value from the plurality of first red average luminance values, and selecting a maximum green average luminance value from the plurality of first green average luminance values The plurality of first-blue flat luminance values are selected from the largest blue average luminance values; and a gain calculation sub-unit is configured to use the maximum red average luminance values and the = mother-first sub-region pixels. a red average luminance value, and a red luminance gain per = sub-region is calculated to obtain a luminance enhancement of the red channel =, according to the maximum green average luminance value, and each of the first sub-regions is statically 2 green average a luminance value, calculating a green luminance of each of the first sub-regions to obtain a luminance addition sheet of the green channel, according to the maximum blue 2-average luminance value and the first blue of each of the first-sub-region pixels The blue luminance gain of each first sub-region is averaged to obtain the luminance private form of the blue channel, and the red channel _ degree gain table early, the green channel _ degree gain table material and the blue channel luminance gain The form is sent to the W image device to be called by the image capture device to compensate for the second original image of the 17 200942017. 2. The gain form establishing unit according to claim 1, wherein the cup form establishing unit further comprises a comparing subunit, wherein two gain ranges are pre-set, and the comparing subunit And comparing whether the red luminance gain of each of the first sub-regions is within a preset gain range, whether each of the first sub-regions, the color luminance cup is within a preset gain range, and each first In the sub-area, the blue luminance gain is within the preset gain range. If the red luminance increases ▲ the green luminance gain and the blue luminance gain are within the preset gain range, a gain form is formed to form a signal, if the red luminance gain, green Brightness Gain, Blue Luminance Gain Any item that is not within the preset gain range outputs a clean image capture device lens and image sensing element signal. An image pickup device having a gain form as described in item ii of the application scope includes an image acquisition unit, a storage unit and a middle domain unit, wherein the image acquisition unit is used for Acquiring the first original image and the second original image, wherein the storage element is configured to store a luminance increase form of the red channel outputted from the gain form establishing unit, a luminance gain form of the green channel, and The luminance of the blue channel ^2: The central processing unit is the same as the area dividing subunit: the divided original image is divided into the first sub-region divided by the first original image a sub-region, respectively calculating a second red average luminance value, a second color average luminance value, and a second blue average luminance value of each second sub-region pixel of the second original image, and calling the red [U] The luminance increase order, the green channel _ degree gain form, in the luminance gain form of the track, multiply the gain of the red channel luminance gain table t 18 200942017 by the corresponding second second of the second original image Domain pixel (four) two red flat _ degree value money line red pass = green luminance gain in the luminance gain form multiplied by: jin ^ the first value of each second sub-region pixel of the first original image for green channel luminance compensation And multiplying the blue luminance gain of the luminance two tr of the blue channel by the second pupil luminance compensation of the corresponding first sub-region pixels of the second original image. W is a value-added blue 4-step gain form creation method, the method for creating an add-on list includes acquiring a first original image; dividing the first-original image into a plurality of first-sub-regions; = a first original = the first luminance of each pixel of the first sub-region, the luminance value of the green average luminance value and the first blue average:: the maximum red luminance of the red average luminance value The t-material-green average luminance value is selected as the largest green flat color=degree t. The plurality of first-blue average luminance values are selected as the largest blue according to the maximum red average luminance value and each of the first Sub =- red average luminance value, calculate the red color of each first sub-region = calculate each first luminance benefit based on the maximum green average luminance value and the first-green average luminance value of each pixel Material range color _度丝19 200942017 The first blue average luminance value of the area pixel, the blue luminance gain of each first sub-area is calculated; according to the red luminance gain, the green luminance gain, and the blue luminance gain Separate shape a luminance gain form of the red channel, a luminance gain form of the green channel, and a luminance gain form of the blue channel; and a luminance gain form outputting the red channel, a luminance gain form of the green channel, and a luminance gain form of the blue channel to the The image capturing device is called by the image capturing device at 0. 5. The gain form establishing method according to claim 4, wherein a comparison step is further included between the luminance gain calculating step and the gain form forming step: comparing each of the first sub-regions Whether the red luminance gain is within a preset gain range, whether the green luminance gain of each first sub-region is within a preset gain range, and whether the blue luminance gain of each first sub-region is within a preset gain range, If the red luminance gain, the green luminance gain, and the blue luminance gain are within the preset gain range, a gain form © is formed to form a signal, if any of the red luminance gain, the green luminance gain, and the blue luminance gain is not at the preset gain Within the range, a clean image capture device lens and image sensing component signals are output. 20