CN1253016C - Image processor - Google Patents
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- CN1253016C CN1253016C CN 03105496 CN03105496A CN1253016C CN 1253016 C CN1253016 C CN 1253016C CN 03105496 CN03105496 CN 03105496 CN 03105496 A CN03105496 A CN 03105496A CN 1253016 C CN1253016 C CN 1253016C
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0428—Gradation resolution change
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
Abstract
A display device comprises a display (2), a display memory (1) and an image processing apparatus (20). Input colour component samples representative of a colour image are stored in the display memory (1) prior to being displayed. The input colour component samples are read out from the display memory (1) and processed by the image processing apparatus (20) before being displayed by the display device. The image processing apparatus comprises a colour dynamic range converter (30) operable to increase the resolution of the input colour component samples, a low pass filter (36) operable to filter the increased resolution colour component signal samples, and a detection processor (34). The detection processor (34) analyses the input colour component samples to detect a difference between samples associated with detail appearing in the colour image. Consequent upon detection of this detail the detection processor (34) adjusts the bandwidth of the low pass filter in correspondence with the detected detail. The image processor thereby increases a colour palette available to display the colour image, with an advantage that detail is preserved in the reproduced image which may otherwise be lost.
Description
Technical field
The present invention relates to strengthen the image processing apparatus and the method for coloured image.
Background of invention
Corresponding great majority are used, and the needed data volume of expression coloured image requires to carry out the compression of certain form or reduces bandwidth and must transmit or data quantity stored to reduce.This is because the coloured image requirement will transmit at least or redness, green and blueness (RGB) representation in components of memory image.Mobile radiotelephone of future generation may need a kind of device, receives and color display by wireless connections, and coloured image is presented on the screen of installing as a phone part.Equally, transmit and store the demonstration coloured image for application requirements such as PDA(Personal Digital Assistant)s.Use for these, coloured image can receive with compressed format, also can compress when receiving, and transmits or the needed data volume of memory image thereby reduce.
A kind of technology that reduces storage color graphical representation desired data amount is to be used to represent that by minimizing the figure place of RGB component reduces the dynamic range of rgb signal sampling.For example, if each pixel is distributed 6 place values for each RGB component so with 18 bit representations, for each component provide one 64 may value of colors scope, produces 262144 kinds of different colours.If be used to represent that the figure place of each component reduces to 4, so can enough each pixels of 12 bit representations, the needed memory size of storage color image has reduced 33%.But the result of Jian Shaoing reduces to 4096 with the possible colored number that each pixel can be represented like this, has therefore reduced so-called " palette " that can be used for presentation video.Thereby the quality in the time of may influencing memory image regeneration.For example, specific images such as face or sunset can produce contour effects, and this is that the specific region at image occurs owing to the restriction of available colored number, are that the palette that reduces causes.Therefore preferably under the situation that does not reduce the reproduced picture quality, reduce the figure place that is used to represent signal sampling.
Summary of the invention
According to the present invention, a kind of image processing apparatus is provided, be used to handle the color component signal sampling expression of input color image, the output color component signal sampling that produces expression input color image enhanced form.Device comprise an enhancement process device that is used to increase input color component samples dynamic range, one be used to filter increased dynamic range the colour sampling to form low pass filter and a measurement processor of the sampling of output chrominance component.Measurement processor is used for detecting with the details that input color image exists represents relevant input color component samples.According to detection, use measurement processor the bandwidth of low pass filter to be adjusted to consistent subsequently with detected details to image detail.
Embodiment of the present invention plan provides a kind of minimizing to represent the needed data volume of coloured image, strengthens simultaneously or the device of quality when keeping image regeneration at least.For this reason, specific implementation image processor of the present invention has disposed the colored enhancement process device that an arrangement is used to improve image color component dynamic range, and the image color component is to be used to represent that by increase the figure place of RGB chrominance component sampling represents.Using low pass filter to filter has then increased the sampling of dynamic range, thereby the level and smooth conversion between the reproduced picture colour is provided.But,, dispose a measurement processor and come the signal sampling of detected image details to represent and the bandwidth of low pass filter is adjusted to consistent with detected details in order to reduce the possibility of losing the reproduced picture details.In one embodiment, arrange the sampling bypass low pass filter of expression details.Thereby reduced the possibility of losing image detail, reduced the result who reduces as palette simultaneously and the possibility of contour effects may occur in image, this is that low-dynamic range by the color component signal sampling causes.
By describing embodiment, other useful feature of the present invention will display.The image processor of the colour sampling that particularly can use a few components to realize providing to have strengthened dynamic range provides a kind of cost-effective realization.
Other various aspects and feature of the present invention have been defined in the dependent claims.
Description of drawings
Only describe embodiment of the present invention by way of example with reference to accompanying drawing now, wherein similarly part is distributed corresponding reference numerals, wherein:
Fig. 1 is the schematic block diagram of LCD display module;
Fig. 2 is the schematic block diagram that comprises the LCD display module of an image processor according to an embodiment of the invention;
Fig. 3 is that a width of cloth produces contour effects because of limited palette example coloured image is represented;
Fig. 4 is the schematic block diagram that appears at the image processor among Fig. 2;
Fig. 5 is the schematic block diagram that appears at the dynamic range transducer among Fig. 4;
Fig. 6 is a table, provides increasing the explanation of the needed value of signal sampling according to the dynamic range that increases, and dynamic range is with respect to increasing by highest significant position being copied to the correspondence that least significant bit obtains;
Fig. 7 is the schematically illustrating of impulse response of the moving average filter of one eight tap duration;
Fig. 8 is the schematic block diagram that appears at the low pass filter among Fig. 4;
Fig. 9 is the schematic block diagram that appears at the measurement processor among Fig. 4;
Figure 10 is the flow chart of the image processor work of key diagram 4 demonstrations; And
Figure 11 is the expression of example coloured image after the image processor that is shown by Fig. 3 is handled.
Embodiment
Referring now to the LCD display module one embodiment of the invention are described.Fig. 1 provides an explanation to typical LCD display module, and such LCD display module will use in mobile radiotelephone or personal digital assistant.Along with mobile radiotelephone to the next generation, the promptly so-called third generation (3G) development will continue to increase the needs that show digital picture on the mobile radiotelephone display module.The typical display module that is used for this application is the LCD display panel, and as shown in Figure 1, such module comprises a display-memory 1, and configuration is used to store the signal sampling of the digital picture that can show and represents on LCD display panel 2.Pixel is the expression of the coloured image that will show, receives and uses write address logical circuit 8 to write display-memory 1 by interface channel 4.When wanting display image, read the signal sampling that is stored in the memory 1 by reading address logic circuit 10, be transformed into analog domain by digital to analog converter 12, be presented at then on the LCD plate 2.
As explaining, the invention provides a kind of device, reduce memory data output, i.e. the size of display-memory 1 in this example, keeping simultaneously will be in, the quality of the image that shows on the LCD plate 2 for example.Reducing memory data output is to finish by the signal sampling dynamic range that reduces the expression chrominance component.As selection, the sampling of the component signal of the coloured image that receives can be to have been reduced dynamic range because of blocking, and this may be that transmitted image is needed.As will be seen, will block identical amount to the RGB component.For these examples of two sides, specific implementation image processor arrangement of the present invention is used to improve the expression of coloured image that receive or storage.As will be explained, this improvement can help loyal or the regeneration original image of the property improved at least, and reduces the possibility that may occur contour effects in image.
One embodiment of the invention have been described among Fig. 2.Fig. 2 has shown the LCD display module in conjunction with Fig. 1 of image processing circuit 20.As shown in Figure 2, the pixel of the coloured image that receives by passage 4 is only with 12 bit representations, rather than 18 shown in Figure 1.Colored truncation device 15 can realize reducing the resolution of signal sampling.By removing two least significant bits of each RGB component, colored truncation device 15 can be truncated to 12 from 18 with signal sampling, thereby can reduce the dynamic range of signal sampling.Therefore the RGB chrominance component makes the storage of display-memory 1 need reduce 33% with 4 rather than 6 bit representations.
By being truncated to 4 results that reduce its dynamic range from 6, the colour signal sampling reduced the palette that can be used for showing reproduced picture.Therefore the quality reduction may appear in coloured image, can cause occurring in reproduced picture profile or tangible smooth segmentation.Fig. 3 has shown a this example that reduces the coloured image that contour effects takes place because of palette.
In order to reduce in the reproduced picture possibility that contour effects takes place, according to display module configuration of the present invention image processor 20.Image processor 20 arrangement is used for increasing the dynamic range of the color component signal sampling of reading from display-memory 1.As shown in Figure 2, for the example embodiment that will illustrate, be used to represent that the figure place of each pixel is increased to 6 from 4.Fig. 4 has shown image processor 20 in more detail.
In Fig. 4, image processor 20 receives 4 RGB color component signal sampling by interface channel 22 from reading address logic circuit 10.Parallel colored dynamic range transducer 30 and the measurement processor 34 of offering of color component signal sampling.Dynamic range transducer 30 arranges to be used to increase the figure place that is used for from 4 to the sampling of 6 bit representation color component signals.The color component signal sampling that strengthens then offers low pass filter 36, and after this signal sampling of Zeng Qianging offers output channel 24.
According to the increase that obtains by dynamic range transducer 30 dynamic range, can amplify 4 signal sampling values in proportion, by figure place being increased to 6 reflection increased dynamic scopes.In order to adjust the chrominance component sample value according to the dynamic range that has increased, the input signal sample value multiply by gain coefficient G.Gain coefficient G calculates to the increase of q position according to the original resolution and the resolution of n position, is shown below:
To realize the needed number of components of gain coefficient G in order reducing, to copy to two interpolations by two highest significant positions and come using gain coefficient G for the least significant bit of 6 defeated sampling 4 input sampling.Fig. 5 has illustrated this with the arrangement of gain application to the input signal sampling.In Fig. 5,4 input signal sampling that are stored in the level Four register 40 are represented with alphabetical A, B, C, D.Six grades of register 42 configurations are used to form the output signal sampling.Interface channel 44 is connected to six grades of registers with the level Four register.As shown in Figure 5, the interface channel arrangement is used in 2 place value A of two-stages before the shift register 40, the back two-stage that B copies to register 42.Therefore, the value of two least significant bits of output signal sampling is to form according to the highest significant position that input signal is sampled.
Fig. 6 provides a table, has illustrated with respect to the signal sampling value is adjusted to 6 probable values that all 4 input signals of the gain that needs are sampled to utilize the dynamic range that increases from 4.Duplicate the gain that obtains with respect to the register arrangement that shows according to Fig. 5 by the position, shown the gain of calculating by top formula.As can be seen from Figure 6, the position is duplicated and is arranged to provide the gain coefficient G to calculating well approximate, and an advantage is arranged is without any need for Multiplier elements, has therefore reduced the realization cost.
For the level and smooth conversion between the value of color is provided, uses low pass filter 36 to filter the color component signal that strengthens and sample.The effect of trap signal sample value is to reduce the possibility that may occur contour effects in reproduced picture.In preferred embodiments, the low pass filter 36 of realization is a moving average filter as shown in Figure 7, that have an impulse response.Fig. 7 illustrates that the effective width that an impulse response of eight tap moving average filters has is T
w
According to the mean value of input signal sampling in a window that is formed by moving average filter impulse response, moving average filter has effectively formed the input signal sampling.The image outline that the filter arrangement is used for the limited dynamic range by each signal sampling resolution is caused produces smoothing effect.
For the current example that in Fig. 7, shows, used the moving average filter of one eight tap, therefore form output sampling according to the mean value in the eight tap windows.As will be explained briefly, in other embodiments, as eight tap moving average filters, low pass filter 36 also comprises one four tap moving average filter and one two tap moving average filter.These filters increase the bandwidth of passing through of low pass filter when being used for sampling in the expression details near the centre tap of eight tap filters.This provides milder filtration yield for the signal sampling that strengthens, and wherein measurement processor is determined the signal sampling of these expression details.
Fig. 8 provides the explanation according to the low pass filter 36 of an example embodiment.In Fig. 8, low pass filter 36 has three moving average filters, comprises eight tap filters of the impulse response that has as shown in Figure 7.As shown in Figure 8, used eight tapped delay 50 with eight sampling of input signal sample delay.In output place of eight taps, use adder 51,54 and the one-level register 56 common output samplings that form.The filter 36 that shows among Fig. 8 is by carrying out next eight the signal sampling values that add up by adder 54, and by adder 52 realize deducting by and drop on last value of eight tap windows outside, effectively realized moving average filter.Therefore adder 52,54 and register 56 have formed the unit 58 that adds up, and realize calculating rolling average output.
Therefore, moving average filter has effectively been realized in the unit 58 that adds up that shows among Fig. 8, does not need to sue for peace and all signal sampling components of dividing in the eight tap windows calculate each output signal sampling.Therefore an advantage providing of the circuit that shows among Fig. 8 is to have reduced the needed number of components of realization moving average filter, and is optional for this circuit multiplier.Relative, the second and the 3rd add up unit 58 ', 58 " formed the output signal sampling of representing four taps and two tap moving average filters.For this reason, second accumulator 58 ' arrangement is used to receive the sampling from the second level and the fourth stage, forms four tap moving average filters, and the 3rd accumulator 58 " arranges to be used to receive the sampling from the third level and level V.Therefore eight, four and two tap filters are with respect to shared time reference and align center.
As shown in Figure 8, selection processor 9 receives control signal by passage 38.Selection processor 59 has four input channels 51,53,55,57.Four input channels 51,53,55,57 arrange to be used for receiving respectively the output sampling of eight tap moving average filters 51, the output sampling of four tap moving average filters 53, the output sampling of two tap moving average filters 55 and the signal sampling of shift register 50 fourth stages.Determine to select from the output of any two tap, four taps or eight taps output or the bypass sampling of the shift register fourth stage according to the control signal that receives from measurement processor 34.
For fear of the possibility that reduces resolution detail such as edge or single pixel object in the reproduced picture, use measurement processor to detect such details.Measurement processor produces a control signal then, thereby selects output sampling or bypass sampling from any eight tap, four taps or two tap moving average filters.Select signal effectively the bandwidth of low pass filter to be adjusted to consistent about tapped relative position with the pixel of representing details.Fig. 9 provides an example implementation of measurement processor 34.As shown in Figure 9, measurement processor 34 comprises one eight grades shift register 60, the shift register 50 that uses in level and the low pass filter 36 grade corresponding.As shown in Figure 9, adder 62 arranges to be used for the signal sampling of receiving inputted signal sampling and the output of shift register 60 second level.Adder 62 arranges to be used for deducting the signal sampling that newly receives from the signal sampling that is present in the second level, and 64 places obtain a difference in output.Threshold values processor 66 compares the difference and the predefined threshold values of signal sampling then, if poor greater than threshold values, then processor 66 produces a control signal on control channel 38.Determine threshold values, make when all three rgb signals sampling are all greater than a corresponding RGB sample value from the pixel of two sampling periods of front, to detect details.But except adder 62, another adder 68 arranges to be used to calculate poor between the fourth stage and the second level output, and this difference also offers threshold values processor 66.
Figure 10 is with the work of flowchart text measurement processor.As shown in Figure 9, adder 62 is carried out the comparison of the content of up-to-date second signal sampling of signal sampling and front.The threshold values processor determines whether to detect details between these two signal samplings that are subjected to comparison, and this represents with step S2 in Figure 10.
As mentioned above, threshold values processor 66 also receives the comparative result between the output that carried out by adder 68, the partial output of shift register and the shift register fourth stage.Therefore, as the step S4 in the flow chart, the threshold values processor determines whether effectively to detect details between second signal sampling in front in fresh signal sampling and the four tap windows that are made of the sample value of the 3rd, the 4th, the 5th and the 6th register stage output place.
If the threshold values processor is according to the comparison of second and fourth stage content of eight tapped delay, determine in four tap filters, not detect details, but in eight tap filters, exist, at step S4, the threshold values processor determines select four tap filters to produce the output pixel sampling at step S5 so.If the threshold values measurement processor is determined the details sampling in four tap filters, but lucky before two centre taps that form two tap filters, then handle and forward step S8 to.
At step S8, the signal sampling value in the fourth stage also and detecting second threshold values that forms between details and the predefine deviant compares, and is as follows:
Threshold values＜sample value＜(threshold values+skew)
If the signal sampling value is greater than threshold values, but add deviant, then carry out, on passage 38, produce control signal, select the output of two tap moving average filters 55 as step 10 less than threshold values.If but the signal sampling value adds deviant greater than threshold values, then select the bypass sampling from the 4th tap output of shift register 50.
If do not detect details at step S2 or S4, forward processing the beginning of step S2 to by circulation S6 so, produce the output that control signal is selected eight tap filters.
Another advantage that provides is to select the relative position of the sampling of expression details in four taps output or two tap outputs and the coloured image and the sample value of expression coloured image to have nothing to do.The threshold values processor is effectively adjusted to the bandwidth of low pass filter consistent with the relative frequency bandwidth of sampling by the pixel of filter.Therefore, if detect details pixel sampling among eight tap windows, but just before four tap windows, then select four taps output.If detect details pixel sampling among four tap windows, but just before two tap windows, then select the output of two tap windows.Otherwise select the output sampling of eight tap moving average filters.By selecting degree of filtration, provide the enhancing of coloured image to represent, thereby reduced the possibility of contour effects according to the relative position in eight tap filters.
Have been found that in addition when sampling in determining coloured image represents that details drops on threshold values and threshold values and adds between the predefine skew,, then can improve color image quality if use two tap moving average filters to produce output sampling.The predefine deviant is set, detects the sample value that surpasses the threshold values lesser amt.Have been found that using two tap moving average filters to filter such sample value has strengthened the regeneration coloured image.This is that the sample value that has been no more than skew because these have just surpassed threshold values is represented to need degree of filtration that the middle details of some restrictions is arranged with respect to two sampling just around in the reproduced picture.Therefore shown in step S7, S8 and S10, if the difference between the signal sampling adds skew greater than threshold values, bypass filter then, be included in the fourth stage of register 60 in the middle of sampling pass to filter output.
Shown among Figure 11 and used the treatment of picture result who shows among the 20 couples of Fig. 3 of image processor, represent with 12 signal samplings.As in Figure 12, seeing, removed the facial contour effects that occurs of woman among Fig. 3.But in this image, kept good detailed information.
Though in the example embodiment of Miao Shuing, the low pass filter arrangement is used for only filtering the one-dimensional signal sampling, can use two dimensional filter in alternate embodiment, reaches further enhancing reproduced picture in the above.Therefore admirable is the horizontal or vertical component samples that can arrange the filter filtering image.
Can carry out various modifications to the embodiment of the present invention of describing before here without departing from the present invention.Admirable especially is to come compressed color image by represent colored sampling with littler figure place.When going out the colour signal sampling from memory read, can by increasing bit resolution color image restoration be arrived original resolution then according to above-described embodiment.Therefore admirable is that the resolution of the storage color image of imagination except that 12 and 18 enhancing resolution are sampled.
Claims (17)
1. an image processing apparatus can be operated the input color component signal sampling that is used to handle the expression input color image, thereby produces the output color component signal sampling of the described input color image enhanced form of expression, and this device comprises:
An enhancement process device can be operated the dynamic range that is used to increase the input color component samples,
A low pass filter can be operated and is used to filter the colour signal sampling that has increased dynamic range, thereby forms described output chrominance component sampling, and
A measurement processor, can operate to be used for detecting and represent relevant input color component samples with the details that this input color image occurs, subsequently according to the detection of described details, described measurement processor can be operated and is used for: by adjusting the bandwidth of the described colour sampling that has increased dynamic range being carried out low-pass filtering, adjust to the described low-pass filtering that has increased the colour sampling of dynamic range consistent with detected details.
2. the image processing apparatus as requiring in the claim 1, wherein, described measurement processor can be operated and is used for sampling as the sampling of output color component signal, not by described low pass filter by the described colour that has increased dynamic range of selecting the described details of expression, adjusts the described low-pass filtering that increased the signal sampling of dynamic range relevant with described details.
3. the image processing apparatus as requiring in the claim 1, wherein, described input color signal sampling is represented with predefined n figure place, described enhancement process device can be operated and be used for copying to 1 least significant bit (LSB) by 7 extra least significant bit (LSB) numbers that add the predefine number to described input color signal sampling and 1 most significant digit of corresponding number that described input component signal is sampled, to improve the resolution of described input color component samples.
4. as the image processing apparatus of requirement in the claim 1, wherein, described low pass filter comprises a moving average filter that has d predefine tap number.
5. the image processing apparatus as requiring in the claim 4, wherein, described input color component samples is passed through moving average filter, form described output chrominance component sampling, subsequently according to the details that detects, when correlated sampling arrived the centre tap of moving average filter, the sampling of the described input color component samples relevant with described details was delivered to described output.
6. the image processing apparatus as requiring in the claim 1, wherein, described low pass filter comprises a plurality of low pass filters, the bandwidth difference of each low pass filter, measurement processor can be operated and be used for adjusting the described low-pass filtering that has increased the colour sampling of dynamic range by the output of selecting one of described low pass filter.
7. the image processing apparatus as requiring in the claim 6, wherein, in the described low pass filter each comprises a moving average filter, the tap number difference of each moving average filter, each moving average filter provides the input signal sampling window of different length, window is with respect to shared time sample position align center, described measurement processor can be operated and is used to detect the sampling of representing described details with respect to shared time reference, subsequently according to detection, before the details sampling enters filtering window, from described moving average filter, select the output signal sampling for corresponding one.
8. as the image processing apparatus of requirement in the claim 6, wherein, described measurement processor can be operated and is used for detecting the sampling relevant with described details by the sequential sampling that more described moving average filter tap exists.
9. the image processing apparatus as requiring in the claim 8, wherein, described measurement processor can operate that to be used to detect the sampling relevant with details be to compare by each chrominance component sampling of a pixel is sampled with the corresponding chrominance component of contiguous pixels, if each chrominance component sampling of contiguous pixels all changes, then detect the details of representing by described contiguous pixels.
10. the image processing apparatus as requiring in claim 8 or 9, wherein, the described sampling interval that is compared two sampling periods.
11. display device, comprise a display, a display-memory and an image processing apparatus, the input color component samples of wherein representing coloured image was stored in the display-memory before showing, described input color component samples is read from described display-memory, handling the back by image processing apparatus is shown by display device, described image processing apparatus can be operated the input color component signal sampling that is used to handle the expression input color image, thereby produce the output color component signal sampling of the described input color image enhanced form of expression, this image processing apparatus comprises:
An enhancement process device can be operated the dynamic range that is used to increase the input color component samples,
A low pass filter can be operated and is used to filter the colour signal sampling that has increased dynamic range, thereby forms described output chrominance component sampling, and
A measurement processor, can operate to be used for detecting and represent relevant input color component samples with the details that this input color image occurs, subsequently according to the detection of described details, described measurement processor can be operated and is used for: by adjusting the bandwidth of the described colour sampling that has increased dynamic range being carried out low-pass filtering, adjust to the described low-pass filtering that has increased the colour sampling of dynamic range consistent with detected details.
12. the display device as requiring in the claim 11 comprises:
A compression processor, can operate and be used to receive described input color component samples, reduce the resolution of each sampling by at least one least significant bit that removes each sampling, the sampling that has reduced resolution is stored in the described memory, wherein stores the least significant digit that the needed memory span of described coloured image removes according to each sampling and reduces.
13. as the display device that requires in the claim 11, wherein, described display is LCD (LCD).
14. as the display device that requires in the claim 11,12 or 13, wherein, analog to digital converter converts the enhancing color component signal sampling that described image processing apparatus produces to show analog form on LCD display.
15. a computing equipment has a display device, this display device comprises a display, a display-memory and an image processing apparatus,
The input color component samples of wherein representing coloured image was stored in the display-memory before showing, described input color component samples is read from described display-memory, handling the back by image processing apparatus is shown by display device, described image processing apparatus can be operated the input color component signal sampling that is used to handle the expression input color image, thereby produce the output color component signal sampling of the described input color image enhanced form of expression, this image processing apparatus comprises:
An enhancement process device can be operated the dynamic range that is used to increase the input color component samples,
A low pass filter can be operated and is used to filter the colour signal sampling that has increased dynamic range, thereby forms described output chrominance component sampling, and
A measurement processor, can operate to be used for detecting and represent relevant input color component samples with the details that this input color image occurs, subsequently according to the detection of described details, described measurement processor can be operated and is used for: by adjusting the bandwidth of the described colour sampling that has increased dynamic range being carried out low-pass filtering, adjust to the described low-pass filtering that has increased the colour sampling of dynamic range consistent with detected details.
16. a mobile radiotelephone has a display device, this display device comprises a display, a display-memory and an image processing apparatus,
The input color component samples of wherein representing coloured image was stored in the display-memory before showing, described input color component samples is read from described display-memory, handling the back by image processing apparatus is shown by display device, described image processing apparatus can be operated the input color component signal sampling that is used to handle the expression input color image, thereby produce the output color component signal sampling of the described input color image enhanced form of expression, this image processing apparatus comprises:
An enhancement process device can be operated the dynamic range that is used to increase the input color component samples,
A low pass filter can be operated and is used to filter the colour signal sampling that has increased dynamic range, thereby forms described output chrominance component sampling, and
A measurement processor, can operate to be used for detecting and represent relevant input color component samples with the details that this input color image occurs, subsequently according to the detection of described details, described measurement processor can be operated and is used for: by adjusting the bandwidth of the described colour sampling that has increased dynamic range being carried out low-pass filtering, adjust to the described low-pass filtering that has increased the colour sampling of dynamic range consistent with detected details.。
17. an input color component signal sampling of handling the expression input color image is to produce the method for the output color component signal sampling of representing described input color image enhanced form, this method comprises
Increase the resolution of input color component samples,
Low-pass filtering is carried out in the color component signal sampling that has increased resolution, form described output chrominance component sampling, and
Detect with described input color image in the details that occurs represent relevant input color component samples, subsequently according to detected details, the bandwidth of the low-pass filtering that the described colour that has increased dynamic range is sampled is adjusted to consistent with detected details.
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| Application Number | Priority Date | Filing Date | Title |
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| GB0204239A GB2385764A (en) | 2002-02-22 | 2002-02-22 | Increasing colour palette with preservation of detail |
| GB0204239.8 | 2002-02-22 |
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| CN1253016C true CN1253016C (en) | 2006-04-19 |
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| CN101317213B (en) * | 2005-09-28 | 2010-12-01 | 索尼爱立信移动通讯股份有限公司 | Method for enhancing colour resolution and device exploiting the method |
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| CN100378674C (en) * | 2004-06-10 | 2008-04-02 | 明基电通股份有限公司 | Method for detecting resolution ratio of electronic display device, storing media and display device |
| CN102622736B (en) * | 2011-01-28 | 2017-08-04 | 鸿富锦精密工业（深圳）有限公司 | Image processing system and method |
| KR102134030B1 (en) * | 2014-10-23 | 2020-07-15 | 엘지디스플레이 주식회사 | Image conversion apparatus and display apparatus having the same |
| CN107154237B (en) * | 2017-07-03 | 2019-08-23 | 江西厚普电子科技有限公司 | Brightness adaptive regulation method based on POV-LED screen |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5012333A (en) * | 1989-01-05 | 1991-04-30 | Eastman Kodak Company | Interactive dynamic range adjustment system for printing digital images |
-
2002
- 2002-02-22 GB GB0204239A patent/GB2385764A/en not_active Withdrawn
-
2003
- 2003-02-17 EP EP20030250945 patent/EP1387319B1/en not_active Expired - Fee Related
- 2003-02-17 DE DE2003608282 patent/DE60308282T2/en not_active Expired - Fee Related
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101317213B (en) * | 2005-09-28 | 2010-12-01 | 索尼爱立信移动通讯股份有限公司 | Method for enhancing colour resolution and device exploiting the method |
Also Published As
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|---|---|
| EP1387319B1 (en) | 2006-09-13 |
| CN1440001A (en) | 2003-09-03 |
| GB0204239D0 (en) | 2002-04-10 |
| GB2385764A (en) | 2003-08-27 |
| DE60308282D1 (en) | 2006-10-26 |
| EP1387319A3 (en) | 2004-10-27 |
| DE60308282T2 (en) | 2007-04-05 |
| EP1387319A2 (en) | 2004-02-04 |
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