WO2015103739A1 - 增强图像对比度的装置、电子设备及方法 - Google Patents
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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
- G06T5/00—Image enhancement or restoration
- G06T5/20—Image enhancement or restoration using local operators
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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
- G06T5/40—Image enhancement or restoration using histogram techniques
-
- 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
- G06T2207/20172—Image enhancement details
- G06T2207/20192—Edge enhancement; Edge preservation
Definitions
- the present invention relates to the field of image processing, and more particularly to an apparatus, an electronic device and a method for enhancing image contrast. Background technique
- the methods for enhancing image contrast are: overall tone reproduction method, overall histogram equalization method, homomorphic filtering method and multi-scale Retinex algorithm.
- the above-described contrast enhancement method in the prior art has the following problem: the overall tone reproduction method loses the contrast of a part of the image area, so that the image looks faded; the image output by the overall histogram equalization method is unnatural; the homomorphic filtering method makes the image The display of the edges is unclear and produces halos; the multi-scale Retinex algorithm still does not eliminate halos.
- Embodiments of the present invention provide an apparatus, an electronic device, and a method for enhancing image contrast, which can be accurately and effectively obtained by dividing an image into at least two layers having different levels of detail and performing different degrees of contrast enhancement on the at least two layers. Enhance image contrast to improve image display.
- an apparatus for enhancing image contrast comprising: a dividing unit, the dividing unit configured to divide an input image into at least two layers, wherein the at least two The level of detail of the layer is different; a reinforcing unit for respectively performing contrast enhancement on each layer of the at least two layers, wherein the degree of contrast enhancement is different for each layer; a synthesizing unit, the synthesizing unit The at least two layers after contrast enhancement are synthesized.
- an electronic device comprising the apparatus according to the first aspect of the embodiments of the invention.
- a method for enhancing image contrast comprising: dividing an input image into at least two layers, wherein at least two layers have different levels of detail; respectively The respective layers of at least two layers are subjected to contrast enhancement, wherein the degree of contrast enhancement is different for each layer; the at least two layers after contrast enhancement are synthesized.
- the invention has the beneficial effects that: by dividing the image into at least two layers with different degrees of detail, and performing different degrees of contrast enhancement on the at least two layers, the contrast of the image is effectively enhanced, thereby improving the display effect of the image. .
- FIG. 1 is a schematic structural diagram of an apparatus for enhancing image contrast according to Embodiment 1 of the present invention
- FIG. 2 is a schematic structural diagram of a dividing unit according to Embodiment 1 of the present invention.
- FIG. 3 is a flowchart of a method for dividing an image by a dividing unit according to Embodiment 1 of the present invention
- FIG. 4 is a schematic diagram showing a gain curve of a luminance gain function according to Embodiment 1 of the present invention.
- Figure 5 is a schematic diagram of a sigmoid function for detail amplification according to Embodiment 1 of the present invention.
- FIG. 6 is a schematic block diagram showing the system configuration of an electronic device according to Embodiment 2 of the present invention.
- FIG. 7 is a flow chart of a method for enhancing image contrast according to Embodiment 3 of the present invention.
- Figure 8 is a flow chart showing a method of enhancing image contrast in Embodiment 4 of the present invention. detailed description
- FIG. 1 is a view showing the configuration of an apparatus for enhancing image contrast according to a first embodiment of the present invention.
- the apparatus 100 includes: a dividing unit 101, an enhancement unit 102, and a synthesizing unit 103, where
- the dividing unit 101 is configured to divide the input image into at least two layers, wherein the at least two layers have different degrees of detail;
- the enhancement unit 102 is configured to perform contrast enhancement on each of the at least two layers, wherein the degree of contrast enhancement is different for each layer;
- the synthesizing unit 103 is for synthesizing the at least two layers after the contrast enhancement.
- the image contrast can be accurately and effectively enhanced, thereby improving the display effect of the image.
- the dividing unit 101 divides the input image into at least two layers having different degrees of detail, and can use any of the existing methods.
- the structure of the dividing unit and the dividing method used in the embodiment of the present invention will be exemplarily described below.
- Fig. 2 is a block diagram showing the structure of the dividing unit 101 of the first embodiment of the present invention.
- the dividing unit 101 includes: an extracting unit 201 and a filtering unit 202, where
- the extracting unit 201 is configured to extract a luminance component of the input image
- the filtering unit 202 is configured to perform edge preservation filtering on the luminance component by using different filter coefficients to obtain at least two layers, wherein the at least two layers include a background layer and at least one detail layer, and the background layer and the detail layer respectively include At least two areas with different contrasts.
- Step 301 Extract a luminance component of the input image.
- Step 302 Perform edge preservation filtering on the luminance component by using different filter coefficients to obtain at least two layers, where the at least two layers include a background layer and at least one detail layer, where the background layer and the detail layer respectively include different contrast ratios At least two areas.
- the display effect of the edge portion of the image can be improved, and the halo phenomenon can be avoided.
- the luminance component of the input image may be extracted using any of the existing methods.
- color space conversion can be performed on the input image, for example, converting the input image into a YCbCr space, and the obtained Y component is the luminance component of the input image; and if the input image is a grayscale image, Get the brightness of the input image directly.
- the luminance component Y is expressed in floating point form, 0 Y 1 .
- edge preservation filtering of the luminance component may use any of the existing methods.
- the edge preservation filtering method adopted by the embodiment of the present invention is exemplarily described below.
- edge-preserving filtering can be performed using Weighted Least Squares (WLS).
- WLS Weighted Least Squares
- the input image g is edge-preserved and filtered by the weighted least squares method to obtain the output image f, and the output image f is made as close as possible to the input image g, and at the same time, the image has a portion other than the gradient.
- the part is as smooth as possible.
- the optimization constraints of the weighted least squares filtering can be expressed by the following formulas (1) and (2): arg mm ( 1 )
- p denotes the spatial position of the pixel
- fli p (g ⁇ n a ⁇ (g) denotes the smoothing weight of the pixel p in the X-axis and y-axis directions respectively
- /1 denotes the filter coefficient, and the larger the value of /1, the filter
- the smoothness of the subsequent image f is higher
- a represents the gradient sensitivity index of the input image g
- represents a small constant for preventing the divisor from being zero, for example f 0.0001.
- the edge portion of the image can be better smoothed, thereby further improving the display effect of the edge portion of the image.
- At least two layers including a background layer and at least one detail layer may be constructed, for example, a background layer, an intermediate detail layer, and a high detail layer may be constructed by the following formula (4):
- C represents the brightness of the background layer
- M represents the brightness of the intermediate detail layer
- F represents the brightness of the highly detailed layer.
- the background layer has no detail components
- the high detail layer has more detail components than the intermediate detail layer.
- the embodiment of the present invention utilizes the structure and division method of the above-described exemplary division unit to obtain at least two layers having different degrees of detail. And, since the edge retention filtering method is employed, each of the at least two layers obtained has at least two regions having different contrasts.
- the enhancement unit 102 is configured to perform contrast enhancement on the respective layers of the at least two layers, respectively, wherein the degree of contrast enhancement is different for each layer.
- Embodiments of the present invention can perform the above enhancement of contrast using any of the existing methods.
- the method of contrast enhancement employed in the embodiment of the present invention is exemplarily described below.
- the enhancement unit 102 determines a luminance gain function for the background layer and the at least one detail layer based on the brightness of the background layer, and respectively uses the luminance gain function of the background layer and the luminance gain function of the at least one detail layer to respectively The background layer and at least one detail layer are contrast enhanced.
- the brightness gain functions of the respective detail layers of the at least one detail layer are the same, and the brightness gain function of the at least one detail layer is different from the brightness gain function of the background layer.
- the brightness gain function of the background layer determined by the enhancement unit 102 based on the brightness of the background layer can be expressed by the following equation (5):
- G(q X » denotes the brightness gain function of the background layer
- q x ) denotes the brightness of the background layer, 0 ⁇ C(x) ⁇ l
- p and q denote the underexposed gain coefficient
- s denotes the overexposure inhibition coefficient
- r Indicates the brightness invariance coefficient, 0 ⁇ p ⁇ q ⁇ r ⁇ s ⁇ l.
- the luminance gain function is different for regions of different brightness in the background layer.
- the gain of the luminance is performed by using p and q;
- the adjustment is performed by using r, p, q; for the luminance greater than or equal to r, and less than or equal to 1 Area, using r and s for brightness suppression.
- the brightness gain function of the at least one detail layer determined by the enhancement unit 102 based on the brightness of the background layer can be expressed by the following equation (6):
- R-1 (r ⁇ l)C(x) where H(C(x)) represents the luminance gain function of at least one detail layer, C( X ) represents the brightness of the background layer, 0 ⁇ (x) ⁇ l; p And q denotes an underexposed gain coefficient, s denotes an overexposure suppression coefficient, and r denotes a luminance invariance coefficient, 0 ⁇ p ⁇ q ⁇ r ⁇ s ⁇ l.
- the enhancement unit 102 utilizes the brightness gain function of the background layer and the brightness gain function of the at least one detail layer to respectively the background layer and the at least one The detail layer is contrast enhanced.
- G( X ), M X ) and (x) respectively represent the brightness of the background layer [, the intermediate detail layer M and the height detail F
- contrast enhancement C(x), M(x) and F(x) respectively Indicates the brightness of the background layer [, the intermediate detail layer M and the height detail layer F before contrast enhancement
- G(C(x)) represents the brightness gain function of the background layer
- H(C(x)) represents the intermediate detail layer M and height The brightness gain function of the detail layer F.
- FIG. 4 is a schematic diagram of a gain curve of the luminance gain function of the present embodiment.
- the abscissa indicates the input background layer brightness B
- the ordinate indicates the gain background layer brightness B e
- the solid line "-" indicates the use of G (C ( X ; background layer obtained after gain)
- the brightness B e indicates the background layer brightness B e obtained by using H (C ( X » gain).
- the apparatus 100 may further include an amplifying unit 104, wherein the amplifying unit 104 is configured to perform detail zooming processing on the detail layer with the most detailed detail components in the at least one detail layer after the contrast enhancement.
- the amplifying unit 104 is an optional component, which is indicated by a dashed box in Fig. 1.
- the display of the image details can be enhanced, thereby further improving the display effect of the image.
- the detail layer having the most detailed detail can be subjected to detail enlargement processing using any of the existing methods.
- the amplifying unit 104 converts the brightness of the detail layer having the most detailed detail components in the at least one detail layer after the contrast enhancement by the sigmoid function, thereby realizing the detail enlargement processing.
- Fig. 5 is a schematic diagram showing the s-type function for detail enlargement of the present embodiment.
- the sigmoid function can be expressed by the following formula (8):
- x. b ⁇ x ⁇ l where a represents the gain adjustment factor and b represents the luminance cutoff, a>0, 0 ⁇ b l.
- the detail layer with the highest detail component is a high detail layer?
- the brightness of the height detail layer after the enlargement process can be expressed by the following formula (9):
- (x) represents the brightness of the height detail layer F after the detail enlargement process
- ( ⁇ ) represents the brightness of the height detail F after the contrast enhancement
- the synthesizing unit 103 enhances the background layer after the contrast enhancement, the intermediate detail layer after the contrast enhancement, and the detail-enhanced processing.
- the brightness of the highly detailed layer is synthesized and expressed by the following formula (10):
- the output image may be directly output ( ⁇ ); if the input image is a color image, the color reconstruction may also be performed based on ( X ) and the RGB component of the input image, Among them, color reconstruction can be performed using any of the existing methods.
- (x) represents the reconstructed RGB component, /.
- ( x ) indicates the RGB component of the input image
- ⁇ ( ⁇ ) indicates the brightness of the input image
- ( ⁇ ) indicates the combined brightness
- the image contrast can be accurately and effectively enhanced, thereby improving the display effect of the image.
- the display effect of the edge portion of the image can be improved, and the halo phenomenon can be avoided.
- the edge portion of the image can be better smoothed, thereby further improving the display effect of the edge portion of the image.
- the display of the image details can be enhanced, thereby further improving the display effect of the image.
- An embodiment of the present invention provides an electronic device including the apparatus for enhancing image contrast as described in Embodiment 1.
- FIG. 6 is a schematic block diagram showing the system configuration of an electronic device 600 according to Embodiment 2 of the present invention.
- electronic device 600 can include central processor 601 and memory 602; memory 602 is coupled to central processor 601.
- the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.
- the electronic device 600 may further include: an imaging unit 603, a communication module 604, an input unit 605, an audio processor 606, a display 607, and a power source 608.
- the imaging unit 603 inputs the captured image to the memory 602 for storage.
- the functionality of the device that enhances image contrast may be integrated into central processor 601.
- the central processing unit 601 may be configured to: divide the input image into at least two layers, wherein the at least two layers have different degrees of detail; respectively, performing contrast enhancement on each of the at least two layers, wherein The degree of contrast enhancement is different for each layer; the at least two layers with enhanced contrast are synthesized.
- the dividing the input image into at least two layers includes: extracting a luminance component of the input image; performing edge preservation filtering on the luminance component by using different filter coefficients to obtain the at least two layers, where
- the at least two layers include a background layer and at least one detail layer, the background layer and the detail layer respectively including at least two regions having different contrasts.
- the performing edge-preserving filtering on the luma component by using different filter coefficients includes: performing the edge-preserving filtering by using a weighted least squares (WLS) method.
- WLS weighted least squares
- the performing contrast enhancement on the respective layers of the at least two layers respectively includes: determining brightness gain functions for the background layer and the at least one detail layer respectively based on brightness of the background layer; A brightness gain function of the background layer and a brightness gain function of the at least one detail layer respectively enhance contrast enhancement of the background layer and the at least one detail layer.
- the central processing unit 601 can be further configured to: the at least one detail layer after the contrast is enhanced
- the detail layer with the most detailed detail component is subjected to detail enlargement processing
- the synthesizing the at least two layers after the contrast enhancement includes: adding a contrast enhanced background layer, and the detail component having the most detailed detail layer
- the detail layer and the detail layer having the most detailed detail components subjected to the detail enlargement process are synthesized.
- the brightness gain functions of the respective detail layers of the at least one detail layer are the same, and the brightness gain function of the at least one detail layer is different from the brightness gain function of the background layer.
- the detail layer having the most detailed detail component in the at least one detail layer after the contrast enhancement is subjected to detail enlargement processing, comprising: using a sigmoid function to enhance the detail component in the at least one detail layer after the contrast enhancement
- the detail layer performs the transformation of the brightness of the detail.
- the apparatus for enhancing image contrast may be configured separately from the central processing unit 601.
- the apparatus for enhancing image contrast may be configured as a chip connected to the central processing unit 601, and the enhanced image is implemented by control of the central processing unit. The function of the contrast device.
- the electronic device 600 does not necessarily have to include all the components shown in FIG. 6.
- the central processing unit 601 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processing.
- the central processing unit 601 receives input and controls the operation of various components of the electronic device 600.
- Memory 602 can be one or more of a buffer, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable device.
- the above-mentioned information related to the failure can be stored, and a program for executing the related information can be stored.
- the central processing unit 601 can execute the program stored in the memory 602 to implement information storage or processing and the like.
- the functions of other components are similar to those of the existing ones and will not be described here.
- the various components of electronic device 600 may be implemented by special purpose hardware, firmware, software, or a combination thereof without departing from the scope of the invention.
- the electronic device is, for example, a portable radio communication device, including all devices such as mobile phones, smart phones, pagers, communication devices, electronic organizers, personal digital assistants (PDAs), smart phones, portable communication devices, and the like.
- the electronic device may also be a device having an imaging function, and the device may not have a communication function, and includes, for example, a camera, a video camera, and the like.
- the embodiments of the present invention do not limit the types of electronic devices.
- Figure 7 is a flow chart showing a method of enhancing image contrast according to Embodiment 3 of the present invention, corresponding to the apparatus for enhancing image contrast of Embodiment 1. As shown in Figure 7, the method includes:
- Step 701 Dividing the input image into at least two layers, wherein the at least two layers have different degrees of detail; Step 702: performing contrast enhancement on each of the at least two layers, wherein contrast enhancement is performed on each layer Different degrees;
- Step 703 Synthesize the at least two layers with enhanced contrast.
- the method of dividing the input image into at least two layers, the contrast enhancement for each layer, and the method of synthesizing the at least two layers are the same as those in the first embodiment, and are not described herein again.
- the image contrast can be accurately and effectively enhanced, thereby improving the display effect of the image.
- Figure 8 is a flow chart showing a method of enhancing image contrast in Embodiment 4 of the present invention for explaining an application example for enhancing the contrast of a color image by the apparatus for image contrast of Embodiment 1. As shown in Figure 8, the method includes:
- Step 801 Perform color space conversion on the input image.
- Step 802 For the luminance component ⁇ obtained after the color space conversion, using different filter coefficients and ⁇ for edge preservation filtering, obtaining the background layer C, the intermediate detail layer M and the high detail layer F;
- Step 803 Determine a brightness gain function G(C(x)) of the background layer C, a middle detail layer M, and a brightness gain function f(C(x)) of the height detail layer F based on the brightness of the background layer C ;
- Step 804 Based on the luminance gain function G(C(x; and H(C(x» respectively for the background layer C, the intermediate detail layer
- Step 805 performing a detail enlargement process on the height detail layer F after the contrast enhancement, and obtaining a high detail layer brightness (X) after detailed enlargement processing;
- Step 806 Synthesize the brightness of the contrast-enhanced background layer, the contrast-enhanced intermediate detail layer, and the detail-enhanced high-level detail layer to obtain the synthesized brightness! ( ⁇ );
- Step 807 Perform color reconstruction based on the synthesized brightness! ( ⁇ ) and the RGB component of the input image. Have to output an image.
- a method of performing color space conversion on an input image a method of dividing an input image into at least two layers, a method of determining a luminance gain function of each layer, performing contrast enhancement on each layer, and performing a height detail layer
- the method of the detail enlargement processing, the method of synthesizing the at least two layers, and the method of performing the color reconstruction are the same as those in the first embodiment, and are not described herein again.
- the image contrast can be accurately and effectively enhanced, thereby improving the display effect of the image.
- Embodiments of the present invention also provide a computer readable program, wherein when the program is executed in a device or an electronic device that enhances image contrast, the program causes a computer to perform the implementation in the device or electronic device that enhances image contrast The method of enhancing image contrast as described in Example 3 or Embodiment 4.
- Embodiments of the present invention also provide a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the enhanced image described in Embodiment 3 or Embodiment 4 in a device or an electronic device that enhances image contrast.
- the method of contrast is not limited to Embodiment 3 or Embodiment 4 in a device or an electronic device that enhances image contrast.
- the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
- the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
- the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.
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GB1610745.0A GB2536830B (en) | 2014-01-08 | 2014-01-08 | Apparatus for image contrast enhancement and method, electronic equipment |
JP2016544509A JP6418242B2 (ja) | 2014-01-08 | 2014-01-08 | 画像コントラストの強調装置、電子機器及び方法 |
CN201480072445.9A CN105900138B (zh) | 2014-01-08 | 2014-01-08 | 增强图像对比度的装置、电子设备及方法 |
PCT/CN2014/070287 WO2015103739A1 (zh) | 2014-01-08 | 2014-01-08 | 增强图像对比度的装置、电子设备及方法 |
US15/204,498 US10282830B2 (en) | 2014-01-08 | 2016-07-07 | Apparatus for image contrast enhancement and method, electronic equipment |
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US11354781B2 (en) | 2020-07-20 | 2022-06-07 | Samsung Electronics Co., Ltd. | Single-image detail and contrast enhancement |
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CN105900138A (zh) | 2016-08-24 |
US20160321790A1 (en) | 2016-11-03 |
US10282830B2 (en) | 2019-05-07 |
GB201610745D0 (en) | 2016-08-03 |
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JP6418242B2 (ja) | 2018-11-07 |
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