WO2006132014A1 - 画像変換装置および画像変換プログラム - Google Patents
画像変換装置および画像変換プログラム Download PDFInfo
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- WO2006132014A1 WO2006132014A1 PCT/JP2006/304242 JP2006304242W WO2006132014A1 WO 2006132014 A1 WO2006132014 A1 WO 2006132014A1 JP 2006304242 W JP2006304242 W JP 2006304242W WO 2006132014 A1 WO2006132014 A1 WO 2006132014A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 95
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 56
- 230000015572 biosynthetic process Effects 0.000 claims description 46
- 238000003786 synthesis reaction Methods 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 27
- 230000002194 synthesizing effect Effects 0.000 claims description 5
- 235000019557 luminance Nutrition 0.000 description 105
- 238000004364 calculation method Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 230000002457 bidirectional effect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 238000005286 illumination Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000002837 heart atrium Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 235000019615 sensations Nutrition 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/10—Image enhancement or restoration using non-spatial domain filtering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/90—Dynamic range modification of images or parts thereof
- G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20048—Transform domain processing
- G06T2207/20064—Wavelet transform [DWT]
Definitions
- the present invention relates to an image conversion apparatus and an image conversion program suitable for designing an optical environment.
- the present inventor has proposed a method capable of quantitatively predicting the feeling of brightness of a target region with high accuracy even when the luminance distribution is complex as in an actual space (see, for example, Patent Document 1). Furthermore, if this method is extended, it is possible to convert the brightness image into a brightness image.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-61150
- An object of the present invention is to provide an image conversion apparatus and an image conversion program that can reduce the calculation load when converting a luminance image into a brightness image.
- the image conversion apparatus performs wavelet decomposition of a luminance image
- J is a decomposition means for generating a subband image (CF is an integer of 2 or more), and a predetermined luminance and brightness feeling. Based on the relationship, the luminance value is converted into a value of brightness for each pixel of the subband image, and the luminance value is converted into the value of brightness by the conversion unit. It has wavelet synthesis of K sub-band images (K is an integer greater than or equal to 2; K ⁇ J), and a synthesis means for generating a brightness image.
- Another image conversion apparatus of the present invention performs wavelet decomposition of a luminance image N times (N is a natural number) and generates (3N + 1) subband images, and predetermined luminance and brightness. Based on the relationship with the feeling of brightness, a conversion means for converting the brightness value into a brightness feeling value for each pixel of the subband image, and the brightness value is converted into the brightness feeling value by the conversion means. And (3N + 1) sub-band image wavelet synthesis is performed N times to generate a brightness image.
- the decomposing means performs the wavelet decomposition using orthogonal wavelets
- the synthesizing means performs the wavelet combining using the orthogonal wavelets.
- the orthogonal wavelet is preferably a function having a substantially symmetrical shape.
- second decomposition means for performing wavelet decomposition of the brightness image generated by the combining means and generating a subband image of J ′ CF ′ is an integer of 2 or more)
- the brightness conversion value is converted by the second conversion means for converting the brightness value into the luminance value for each pixel of the sub-band image generated by the second decomposition means, and the brightness conversion value by the second conversion means.
- Wavelet synthesis of K 'sub-band images ( ⁇ ' is an integer greater than or equal to 2; K' ⁇ J ') whose values are converted to the luminance values, and a second synthesis means for generating luminance images It is preferable to provide.
- wavelet decomposition of the brightness image generated by the synthesizing means is performed N 'times ( ⁇ ' A natural number) and a second decomposing means for generating (3N ′ + 1) subband images, and based on the relationship, the subband image generated by the second decomposing means for each pixel of the subband image.
- the image conversion program performs wavelet decomposition of a luminance image, generates a J subband image (J is an integer of 2 or more), a predetermined luminance and brightness, Based on the relationship, a conversion procedure for converting the luminance value into a brightness value for each pixel of the subband image, and the luminance value is converted into the brightness value by the conversion means.
- wavelet synthesis of K sub-band images K is an integer greater than or equal to 2; K ⁇ J) V, and a synthesis procedure for generating a brightness image.
- Another image conversion program of the present invention performs a wavelet decomposition of a luminance image N times (N is a natural number) and generates a (3N + 1) subband image, a predetermined luminance, Based on the relationship with the feeling of brightness, a conversion procedure for converting the brightness value into a brightness feeling value for each pixel of the subband image, and the brightness value is converted into the brightness feeling value by the converting means.
- Wavelet synthesis of the converted (3N + 1) subband images is performed N times to make the computer execute a synthesis procedure for generating a brightness image.
- FIG. 1 is a block diagram showing a schematic configuration of an image conversion apparatus 10 of the present embodiment.
- FIG. 2 is a flowchart showing an image conversion procedure.
- FIG. 3 is a diagram for explaining wavelet decomposition.
- FIG. 4 is an explanatory diagram of a subband image generated by wavelet decomposition.
- FIG. 5 is a diagram illustrating an example of a coefficient representing a relationship between brightness and a feeling of brightness.
- FIG. 6 is an explanatory diagram of a subband image after coefficient processing.
- FIG. 7 is a diagram for explaining an evaluation scale for a feeling of brightness.
- FIG. 8 is a diagram for explaining each pattern used in accuracy evaluation.
- FIG. 9 is a schematic diagram showing the configuration of an experimental apparatus used for actually measuring brightness.
- FIG. 10 is a diagram showing the prediction accuracy of a feeling of brightness when each pattern of FIG. 8 is used.
- FIG. 11 is a diagram for explaining a change in a feeling of brightness (actual value) depending on the size of a target area.
- FIG. 12 is a diagram for explaining a change in a feeling of brightness (actual value) depending on the size of the target region.
- An image conversion apparatus 10 (FIG. 1) is a computer having an image conversion program power S installed.
- An input image to be processed (for example, a luminance image) and an output image (for example, a brightness image) to be processed are displayed.
- a recording medium CD-ROM, etc.
- a carrier wave including an image conversion program
- the image conversion apparatus 10 captures the luminance image (FIG. 3 (a)) into the memory 10A.
- the luminance image is a digital image related to the luminance distribution in the space predicted by an arbitrary lighting simulation, and expresses the spatial dependence of the real value of luminance.
- Lighting simulation is a simulation of the light environment created according to the arrangement of lighting fixtures in a room, for example. In addition to lighting simulations, it is also possible to capture luminance images using a CCD power camera.
- step S2 the calculation unit 10B of the image conversion apparatus 10 calculates the logarithm of each pixel value of the luminance image, and then proceeds to the process of step S2.
- orthogonal wavelet for example, symlet6
- wavelet decomposition of the luminance image is performed, so that four sub-band images LL (-1), LL (-1), HL (-1), LH (-1), HH (-1) are generated.
- the subband image LL (-l) is obtained by extracting the low frequency component of the luminance change in the luminance image, and can be considered as an approximate image of the luminance image.
- the other subband images HL (-l), LH (-1), and HH (-1) are high-frequency
- the wave component, horizontal high-frequency component, and oblique high-frequency component are extracted.
- the number of pixels in the subband images LL (-1), HL (-1), LH (-1), and HH (-1) is 1/4 of the number of pixels in the luminance image.
- step S3 the image conversion apparatus 10 determines whether or not the above wavelet decomposition has been performed to the minimum level. If the minimum level has been reached, the process returns to step S2. Repeat the wavelet decomposition while lowering the level one by one.
- the lowest level is set to, for example, -11 level. In this case, the number of iterations of step S2 (wavelet decomposition) is 11.
- the second wavelet decomposition is a wavelet decomposition from the first level to the second level, and is performed on the low-frequency component subband image LL (-l) of the first level.
- the subband image LL (-2) is a low frequency component extracted from the luminance change in the subband image LL (-l), and similar to the subband image LL (-l), Can think.
- the other sub-band images HL (-2), LH (-2), and HH (-2) are the high-frequency component in the vertical direction and the high-frequency component in the horizontal direction of the luminance change in the sub-band image LL (-1), respectively. Components and high-frequency components in the diagonal direction are extracted.
- the second wavelet decomposition (Fig. 3 (b) ⁇ (c)) has a lower (rough) luminance change. Can be extracted.
- the sub-band image LL (-2) with two levels of low frequency components and the four sub-band images LL (-3), HL (-3), LH (- 3) and HH (-3) are generated (Fig. 3 (d)), and each time the level is lowered, coarser luminance changes are extracted.
- the image conversion apparatus 10 performs the next step. Proceed to S4.
- the wavelet decomposition has been repeatedly performed 11 times, and the three subband images HL (-1), LH (-1), HH (-1), HL (-2), LH (-2), HH (-2), ..., LL (-11), HL (-11), LH (-11), HH (-11) are generated and image It is stored in the memory 10A of the conversion device 10.
- step S4 the calculation unit 10B of the image conversion device 10 performs a predetermined brightness and brightness feeling.
- coefficient alpha (-1), for each level shown in example FIG. 5 ⁇ (- 2), whil , ⁇ (-11), ⁇ (-11) relationship between on the basis of the coefficients the following process , LL (-1), LH (-1), HH (-l), HL (-2), LH (-2), HH (-2), ..., LL
- the luminance value is converted into a value of brightness.
- the pixel value luminance of 11-level low-frequency component subband image LL (-ll) Is converted into a brightness value (subband image LL '(-11) pixel value).
- Pixel value of LL '(-11) j8 (-11) X (pixel value of LL (-11)) +4.653435 ... ii)
- Subband image LL' (-11) is the brightness image to be finally obtained This corresponds to the 11th level low frequency component.
- the subband images HL ′ ( ⁇ N), LH ′ ( ⁇ N), and HH ′ ( ⁇ N) correspond to the N-level high-frequency components of the brightness image to be finally obtained.
- HH '(-N) pixel value ⁇ (-N) X (HH (-N) pixel value) --- (4)
- the coefficient processing (Step S4) using the above equations (1) to (4) is the effect of brightness changes at various frequencies extracted from the original brightness image on the brightness (that is, the coefficient ⁇ (-1 ), ⁇ ( ⁇ 2),... ⁇ circle around (3) ⁇ , ⁇ ( ⁇ 11), ⁇ ( ⁇ 11)).
- the subband images HL ′ ( ⁇ l), LH ′ ( ⁇ 1), HH ′ ( ⁇ 1),..., LL shown in FIG. '(-11), HL' (-11), LH '(-11), HH' (-11) are stored.
- the pixel value (value of brightness) in the subband image LL '(-ll) corresponds to the brightness (Bu) at uniform luminance.
- the pixel values of the subband images HL ′ ( ⁇ N), LH ′ ( ⁇ N), and HH ′ ( ⁇ N) (value of brightness feeling) correspond to the brightness feeling (Be) due to the brightness contrast effect.
- the determination of the coefficients oc (-1), a (-2),..., ⁇ (-11), j8 (-11) in Fig. 5 will be described last.
- step S5 the calculation unit 10B of the image conversion apparatus 10 is the same as that used in step S2.
- step S6 the same orthogonal wavelet (for example, symlet6)
- symlet6 the same orthogonal wavelet
- the subband image LL '(-10) of the low frequency component of the next higher level (1-10 level) can be generated.
- step S6 it is determined whether or not the above wavelet synthesis is performed up to the level of the original image (in this case, the luminance image in Fig. 3 (a)). If this is the case, return to step S5 and repeat wavelet synthesis while increasing the level one by one. In the present embodiment, since the lowest level is 11, the number of repetitions of the processing of step S5 (wavelet synthesis) is 11.
- the second wavelet synthesis is a wavelet synthesis from the 10th level to the 9th level.
- a subband image LL ′ (-9) of a low frequency component that is one level higher (19 levels).
- the third and subsequent wavelet synthesis is performed in the same manner.
- the one-level subband image LL '(-l) generated by the tenth wavelet synthesis and three one-level images shown in FIG.
- Subband image Based on HL '(-1), LH' (-1), and HH '(-1) the subband image (that is, brightness) of the low frequency component at the level of the original image (0 level)
- the image conversion apparatus 10 ends the image conversion calculation process of FIG.
- the pixel value (value of brightness) of the brightness image in which the luminance image (Fig. 3 (a)) force is also converted in this way is obtained as a numerical value (1 to 13) of the evaluation scale shown in Fig. 7. It is done. Therefore, by knowing the adjectives (very dark to very bright) corresponding to the pixel values (1 to: L3) of the brightness image, it is possible to grasp the “feel of brightness” adapted to human senses. .
- the evaluation scale in Fig. 7 is a numerical value (1 to 13) compared to the adjectives of brightness (very dark to very bright) commonly used in the field of light environment design. Allocated.
- the pixel value (predicted value) of the brightness image converted from the luminance image (FIG. Make a comparison.
- the experimental apparatus consists of a milky white panel 11 covering a field of view of 180 °, a black paper tube 12 attached from the center of the panel 11 to the outside, and the tip of the tube 12 It consists of a daylight fluorescent lamp 13 attached to the tube, a film 15 attached to the other end of the tube 12 (panel 11 side), and a number of fluorescent lamps 14 provided on the entire outside of the panel 11. Has been.
- the brightness of the surrounding area is adjusted by the amount of light from the fluorescent lamp 14 in the room shielded by the black curtain, and the brightness of the target area is adjusted by the fluorescent lamp 13.
- the adjustment was made according to the amount of light, while adjusting the size of the target area.
- the brightness of the peripheral area near the target area was adjusted by changing the transmittance of the film 15.
- the subjects were nine men and women in their twenties with normal vision of 1.0 or higher, including corrected vision with an ophthalmoscope. Actual measurement was performed 2 to 3 times (Z1 name) for each pattern to stabilize the evaluation. Various patterns were randomly presented to the subjects.
- the measurement of the feeling of brightness using this experimental apparatus is based on the numerical value (1) of the evaluation scale in FIG. 7 as the feeling of brightness of the target area of each presented pattern according to each sense. ⁇ 1 Select one from 3).
- the numerical value of the evaluation scale selected for each subject is averaged for each pattern, and the average value obtained is taken as the “actual value”.
- Figure 10 shows a comparison between the predicted brightness value and the measured value for each pattern obtained as described above.
- the horizontal axis in Fig. 10 represents the actual measurement value, and the vertical axis represents the predicted value.
- Fig. 10 As can be seen, the points ( ⁇ ) representing the combination of the measured and predicted values of each pattern are gathered on the approximately 45 ° line. The error is about ⁇ 1 on the rating scale.
- the image conversion calculation process (FIG. 2) in the image conversion apparatus 10 of the present embodiment is sufficiently accurate. That is, according to the image conversion apparatus 10 of the present embodiment, even when the luminance distribution is complex, it is possible to quantitatively predict the feeling of brightness of the target area in the luminance image with high accuracy.
- the wavelet decomposition in step S2 and the wavelet synthesis in step S5 in FIG. 2 are combined (that is, applying the so-called discrete wavelet transform method), Since the luminance image power is also converted into a brightness image, the computational load at that time can be reduced. Therefore, it is possible to obtain a brightness image and a brightness image at a high speed in a very short time compared to the conventional case.
- wavelet decomposition and wavelet synthesis are performed using orthogonal wavelets (steps S2 and S5 in Fig. 2). Can be very small. Therefore, after conversion from the brightness image to the brightness image as described above, the same orthogonal wavelet is used to perform reverse conversion from the brightness image cover to the brightness image to restore the original brightness image. be able to. That is, according to the image conversion apparatus 10, bidirectional conversion between a luminance image and a brightness image can be performed at high speed.
- the coefficient processing is performed according to the following equations (5) to (8).
- the N-level subband images of the brightness image are LL '(-N), HL' (-N), LH '(-N), and HH' (-N).
- the N-level subband images of the luminance image are LL (-N), HL (-N), LH (-N), and HH (-N).
- HL (-N) pixel value (HL '(-N) pixel value) ⁇ ⁇ ; (-N)--(6)
- the subband images LL '(-l), ... generated by wavelet decomposition are obtained by extracting low frequency components and high frequency components of the brightness change in the brightness image.
- the pixel value (luminance value) of the subband image LL (-11) corresponds to uniform luminance.
- the pixel values (luminance values) of the subband images HL (-N), LH (-N), and HH (-N) correspond to the luminance contrast effect.
- the inverse transformation process as described above may be applied to a brightness image that has been subjected to luminance image power conversion in advance, or may be applied to a brightness image that is newly generated by some method. In the former case, it is preferable to use the same orthogonal wavelet as that used when the luminance image power changes to a brightness image. In addition, in the inverse conversion from the brightness image to the luminance image, each pixel shows a logarithmic value in the luminance image at the time when the wavelet synthesis is completed. For this reason, it is preferable to calculate each pixel value to a real value to obtain a final luminance image.
- the pixel value (luminance value) of the subband image is expressed using the expressions (1) to (4). It is possible to generate a brightness image by converting to the value of and performing wavelet synthesis of the converted subband image.
- the pixel value (value of brightness) of the subband image is converted into a luminance value using Equations (5) to (8), and the converted subband is converted.
- a luminance image can be generated by performing wavelet synthesis of the image.
- the image conversion apparatus 10 of the present embodiment can perform bidirectional conversion between the luminance image and the brightness image as described above at high speed, the following illumination design and illumination control are performed. Can be realized efficiently.
- the conventional lighting design is a lighting design that uses illuminance, and it can guarantee the visibility of letters written on the paper, but it is used to create an indoor atmosphere, wall lighting in the atrium, light-up lighting. Etc. (brightness distribution created by light) is hardly supported.
- Etc. (brightness distribution created by light) is hardly supported.
- a brightness image can be captured in real time using a CCD camera and converted into a brightness image (an image that directly represents how a person looks).
- a pixel value value of brightness
- control system is used not only for the adjustment of the artificial lighting described above but also for the adjustment of the window blind inclination, the output adjustment of the monitor device of various devices, the output adjustment of the PC projector, and the like. Can do.
- a function having a substantially symmetrical shape as an orthogonal wavelet For example, using symlet6
- it is possible to perform conversion suitable for the characteristics of the human eye's sense of brightness the contrast effect of the sense of brightness is symmetrical with respect to the center of the field of view and has no directionality). it can.
- the pattern prepared as the luminance image is the same as that shown in Figs. 8 (a) and 8 (b).
- Fig. 11 and Fig. 12 show the measured values of the brightness of each pattern, for example, for a luminance ratio of 100 and a luminance ratio of 0.3.
- the horizontal axis of FIGS. 11 and 12 is a logarithmic axis representing the size (deg ′) of the target area, and the vertical axis represents the actual value of the sense of brightness. "X" in Fig. 11 and Fig. 12
- the size of the target area is “ ⁇ ”, which corresponds to the viewing angle 180 ° of the target area of each pattern.
- the target brightness is uniformly distributed over the entire field of view of 180 °.
- the actual measurement value when the size of the target area is “ ⁇ ” corresponds to the brightness (Bu) with uniform luminance.
- the brightness feeling (Be) due to the contrast effect of the luminance is the measured value when the size of the target area is " ⁇ " (see Bu in Figs. 11 and 12) and the measured value when it is finite. It can be thought that it corresponds to the difference of S. As shown in Fig. 11, when the luminance ratio is> 1 (the target area is higher in luminance), the brightness feeling Be due to the luminance contrast effect has a positive value, and the luminance ratio becomes 1 ( In the case where the target area has lower brightness), the brightness Be due to the brightness contrast effect has a value of “minus”.
- symlet6 is used as the orthogonal wavelet, but the present invention is not limited to this.
- the same calculation can be performed by using a substantially symmetrical function (for example, symlet4, 8).
- a function other than symlet6 it is necessary to re-determine a value that is different from that in Fig. 5 and Equation (1) 5) as a coefficient representing the relationship between brightness and brightness.
- the method of obtaining is the same as described above.
- the same orthogonal wavelet is used for the conversion from the luminance image power to the brightness image and the inverse conversion from the brightness image to the luminance image, but different orthogonal wavelets are used. It may be used. In this case, it is appropriate for each orthogonal wavelet. Since there is a sharp coefficient (relationship between brightness and brightness), it is necessary to obtain an appropriate coefficient using the above method and use it in the image conversion calculation process.
- the present invention can also be applied to the case where force non-orthogonal wavelets using orthogonal wavelets are used. In this case, since each function is not independent, approximate calculation is required for the wavelet synthesis.
- each wavelet of decomposition Z synthesis is non-orthogonal.
- approximate calculation is not required. Therefore, even in the case of using the bi-orthogonal wavelet, as in the case of using the above-described orthogonal wavelet, the error in the image conversion calculation process can be made extremely small, and bidirectional conversion between the luminance image and the brightness image can be performed. It can be performed at high speed.
- the present invention is effective not only when the wavelets of decomposition Z synthesis form orthogonal systems, but also when they form an orthogonal system when they are combined (bi-orthogonal). Have the same effect.
- the power obtained by performing wavelet decomposition up to the 11th level is not limited to this.
- the minimum level may be set according to the required accuracy of image conversion.
- the wavelet decomposition may be terminated at that point. In any case, the lowest level when the wavelet decomposition is finished is
- Equation (1) 5 If it is different from the 11th level, instead of calculating Equation (1) 5), the following equation (9) 10) is applied for each pixel of the subband image (LL) of the lowest level low frequency component. You can go to In Equation (9) 1 0), the lowest level is the M level.
- coefficients ⁇ (-1), «(-2), ..., hi (-11), ⁇ (-11) representing the relationship between brightness and brightness
- the image conversion apparatus 10 may be chipped by dedicated hardware (LSI). By using the tip, real-time control such as lighting control becomes possible.
- LSI dedicated hardware
- the present invention is not limited to this.
- the logarithmic calculation described above is a calculation that takes into account the nonlinearity of the visual system, and the same effect can be obtained by using a power function such as 1Z3 power in addition to the logarithm.
- the power function may be set according to the expression of the uniform perceptual space.
- the result of psychological evaluation experiment using an absolute scale is used for brightness perception, but scaled using a threshold value (a boundary value indicating whether a difference can be recognized) or the like. You can do it.
- the resolution of the image is set to about 0.1 °, but the present invention is not limited to this.
- a resolution other than 0.1 ° (for example, a higher resolution) may be set.
- the number of wavelet decompositions is set to N (N is a natural number), and (3N + 1) subband images are generated by N wavelet decompositions.
- N is a natural number
- 3N + 1) subband images are generated by N wavelet decompositions.
- the present invention is not limited to this.
- the coefficient processing of the subband images is performed and all the processed subband images (3 N + 1) are wavelet synthesized (N times). Of the subband images after coefficient processing, any number smaller than (3N + 1) may be wavelet synthesized.
- 3N + 1 any number smaller than (3N + 1) may be wavelet synthesized.
- more accurate conversion can be performed, and bidirectional conversion between luminance and brightness images is possible. It becomes.
- the power for generating four subband images by one wavelet decomposition is not limited to this.
- the present invention can be applied if the number of subband images generated by one wavelet decomposition is two or more.
- the upper level subband image may be generated from two or more subband images. .
- the number of wavelet decompositions is set to the same number (for example, 11 times) during bidirectional conversion between a luminance image and a brightness image, but the present invention is not limited to this.
- the number of wavelet decompositions performed at the time of conversion from a luminance image to a brightness image and the number of wavelet decompositions performed at the time of reverse conversion from a brightness image to a luminance image may be set to different numbers.
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US7970236B2 (en) | 2006-04-18 | 2011-06-28 | Tokyo Institute Of Technology | Image transform apparatus and image transform program |
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Also Published As
Publication number | Publication date |
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EP1890120A1 (en) | 2008-02-20 |
US20080037892A1 (en) | 2008-02-14 |
JPWO2006132014A1 (ja) | 2009-01-08 |
EP1890120A4 (en) | 2014-07-09 |
EP2866192A3 (en) | 2015-09-23 |
EP2866192A2 (en) | 2015-04-29 |
JP4016072B2 (ja) | 2007-12-05 |
US7787710B2 (en) | 2010-08-31 |
CN101194151A (zh) | 2008-06-04 |
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