CN1394077A - Device and method for mapping look-up of table in photographic system - Google Patents
Device and method for mapping look-up of table in photographic system Download PDFInfo
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- CN1394077A CN1394077A CN01119826.5A CN01119826A CN1394077A CN 1394077 A CN1394077 A CN 1394077A CN 01119826 A CN01119826 A CN 01119826A CN 1394077 A CN1394077 A CN 1394077A
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- 238000013507 mapping Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 10
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Abstract
The invention discloses the device and method for looking up table in the camera shor system. The invented mapping table look-up method is executed in the device. In includes at least following steps. With the digital signal possessing the high order part and the low order part being received, the mapping table look-up in carried out based on the curve table. Processing the high order part obtains the high order signal. The partial high order part is processed by the slope table so as to obtain a factor. Calculating the low order part of the digital signal and the factor gets the low order signal. Combining the high order signal with the low order signal obtains the output signal. The invented curve table and slope table can reduce the storage space needed by the traditional mapping table look-up of camera shot system.
Description
The invention relates to a kind of table look-up (look-up table, apparatus and method LUT) of apparatus and method, particularly a kind of scanner equipment of the acquisition equipment of making a video recording; It can reduce the storage space of the required use of look-up table.
Optical scanner generally is used for capturing digitized image; For instance, an optical scanner can be used to capture the image that is printed on a piece of paper, and these digitized videos can be stored, or is handled generation ASCLL sign indicating number through identification software.Traditional scanner comprises: a light source, analog/digital converter, controller and random access memory.
With reference to shown in Figure 1, in a camera system, for example the photoelectric sensor 110 of one scan device changes its light that receives and becomes charge signal, and the size of charge signal is relevant with the time for exposure with the reception light intensity.Then, change these into aanalogvoltage from photoelectric sensor 110 electric charges, pass through analog/digital converter 120 again, handle and store at random access memory for digitized video with its digitlization by analogue amplifier (not drawing on the figure).Yet, follow a problem of present scanner to be: not to be the light that directly is proportional to image and is reflected by the M position digital signal that optical sensor produced.In other words, for the optical sensor scope of application, the output of optical sensor is not to be linear relation with input light.Therefore, for the processing of prining, between input light and digital signal conversion, the transducer conversion process must be arranged.The conversion of M position digital signal can be finished by being positioned at light and shade compensation 130 (Shading compensation) agate afterwards 140 (gamma look-up table) that table look-up.From add agate table look-up 140 output output signals reach host computer through a memory 150 again.
Form in the look-up table some mapping (enum) datas that prestore, these mapping (enum) datas are produced by a curve (can select a monotonic increase curve usually) of correspondence, and it can be considered a memory, when its is each when receiving an address, will produce an output information.Yet one of shortcoming of utilizing look-up table is, when input signal comprised more multidigit, the shared storage space of form was just considerable.As shown in Figure 2, input signal Si and output signal So are all 16 bit formats, add agate and table look-up and 140 need go to shine upon input signal Si up to 370K bit memory space, and the preferable output signal So of quality just can be arranged.In order to reduce the cost of tabling look-up, the mapping of tabling look-up just applies to interpolation method; The utilization interpolation method must be carried out twice read cycle or need read form twice, is one of shortcoming for device at a high speed.Another kind of settling mode is that the work of will shine upon moves to host computer, yet, so will expend the more time, and increase the amount of expending of memory.
In above-mentioned background of invention, the invention provides a kind of method and device of the mapping of in camera system, tabling look-up; This tables look-up and takies less storage space.
Another object of the present invention is to provide a kind of method and device of the mapping of in high speed scanner, tabling look-up; The work of mapping of tabling look-up does not need to carry the read cycle twice or read two groups of data and just can finish.
A further object of the present invention is to provide method and the device that shines upon in the scanner; The signal of lowest order part also can be contained in the output signal through tabling look-up in digital signal.
According to above-described purpose, a kind of apparatus and method of tabling look-up in camera system are disclosed, this mapping look-up of table method is carried out in device, and it comprises at least: receive one and have a high position (high-bit) part and low level (low-bit) digital signal partly; Carry out mapping look-up of table with curve tables; The high bit part of processing digital signal is to obtain high signal; With a slope form processing section high-order portion to obtain a factor; The low portion of computing digital signal and the factor are to obtain a low level signal; In conjunction with high signal and low level signal to obtain an output signal.Curve tables of the present invention and slope form can reduce the required storage space of occupying of mapping look-up of table of camera system.
Apparatus and method of the present invention can be widely applied in many camera systems; when the present invention illustrates the inventive method with a preferred embodiment; those skilled in the art are well known that many steps and element can change, and these general replacements do not break away from spirit of the present invention and protection range far and away yet.
Secondly, the present invention is described in detail as follows with schematic diagram, and when the embodiment of the invention was described in detail in detail, the part schematic diagram of expression camera system can be done local the amplification in order to explanation not according to general ratio, but should be with this as the reason of the present invention of qualification is arranged.
The drawing explanation:
Fig. 1 is the schematic flow sheet that traditional camera system is obtained image;
Fig. 2 is the conventional method schematic diagram of tabling look-up;
Fig. 3 is the inventive method schematic flow sheet;
Fig. 4 is the schematic diagram that the inventive method is finished with hardware designs.
Embodiment:
In this embodiment, be disclosed in the apparatus and method of tabling look-up in the camera system, this mapping look-up of table method is carried out in device, and it comprises at least: receive one and have a high position (high-bit) part and low level (low-bit) digital signal partly.Carry out mapping look-up of table with curve tables, the high-order portion of processing digital signal is to obtain high signal.With a slope form processing section high-order portion to obtain a factor.The low portion of computing digital signal and the factor are to get a low level signal.Curve tables of the present invention and slope form can reduce the required storage space of occupying of mapping look-up of table of camera system.
As shown in Figure 3, be the schematic flow sheet of the inventive method, step of the present invention is described.One digital input signals (the step 10) that comprises image information at first is provided; Usually (most significant bit, MSB) (least significantbit LSB) forms digital input signals with lowest order by highest order.The MSB of digital input signals partly carries out high position mapping and handles (step 12); On the other hand, the LSB of Bu Fen MSB and digital input signals part is then hanged down bit arithmetic (step 11).Be combined into an output signal (step 15) again through high position mapping processing and the signal behind low bit arithmetic; These a little steps of the present invention can utilize hardware or software design to come complete.
As shown in Figure 4, be the schematic diagram that the inventive method is finished with hardware designs.So-called hardware designs, for example memory and peripheral circuit.In a preferred embodiment, curve tables 22 is stored in the memory, for example read-only memory (ROM) or random-access memory (ram).Computing district 23 can utilize computing circuit to finish with land 24, for example combination of adder or multiplier.
Multistation digital signal S is divided into MSB part S
(MSB)With LSB part S
(LSB)S
(MSB)Form S by some institutes that comprise highest order
(LSB)Then form by some institutes that comprise lowest order.In this preferred embodiment, S is 16 signals, S
(MSB)With S
(LSB)Then be all 8.At first, S
(MSB)Be sent to curve tables 22 to carry out mappings work.In curve tables 22 existing one default add the Maqu line with S
(MSB)Carry out mappings work, S
(MSB)With curve tables 22 mapping back outputs one signal S
OM1Add the Maqu line and can set S according to user's different needs
(MSB)With S
OM1Figure place identical; Yet, S
(MSB)With S
OM1Figure place also can be different, for example, examine and filter higher accuracy, S
OM1Can be 16 bits.In this preferred embodiment, S
OM1Be 8 bits.
On the other hand, by S
(MSB)The S that the part position produces
IM2Be sent to slope form 21 to carry out computing, output S
(LSB)The multiplying factor S
OM2In this preferred embodiment, S
IM2Be 3, and the multiplying factor S
OM2It is 8.Slope form 21 is the set that adds the slope value of Maqu line in curve tables, is to be divided into some differential sections and to obtain this a little slopes adding the Maqu line.The number of differential section is decided with adding the breakover point number in the line of Maqu according to the slope variation that adds the Maqu line; Differential section number is many more, the multiplying factor S of gained
OM2Just accurate more.Moreover, slope value can be on the occasion of or negative value, according to adding the Maqu line and deciding.Therefore, the multiplying factor also can be on the occasion of or negative value.
In computing district 23 with the multiplying factor S
OM2With S
(LSB)Do multiplying, export S again
OL1In this preferred embodiment, S
OL1Be one 8 signals.Then, in the land 24 with S
OL1With S
OM1Make sum operation; Then the 24 signal SO that export one 16 handle for follow-up host computer from the land.
Use the inventive method many advantages are arranged.At first, utilize this method can reduce the shared storage space of the form of tabling look-up, because the shared amount of memory of slope form is less.Utilize following table 1 that conventional art and memory use amount of the present invention are done one relatively:
Table 1
M in the table 1, n represent the figure place that input signal and output signal are comprised respectively.As shown in Table 1, when the figure place of input signal and output signal not for a long time, the shared storage space of method of the present invention is half of conventional art; When the figure place of input signal and output signal was increased to 16, method of the present invention can be saved the storage space of 1M nearly.Secondly, the slope in the slope form changes according to the Maqu line that adds in curve tables, can write in advance in the slope form according to user's needs.And be to try to achieve different output effects, curve tables of the present invention and slope form can change arbitrarily, to storage space to take influence also little, be exactly always change curve tables output signal figure place shown in the table 2 and the input of slope form, output signal figure place take storage space:
| ?m | ?n | The table look-at method | Two-stage mapping look-up of table method | The inventive method |
| ??9 | ??8 | ??512*8＝4096 | ??256*8+256*8＝4352 | ??256*8+8*8＝2112 |
| ??10 | ??8 | ??2^10*8＝8192 | ??256*10+256*8＝4608 | ??256*8+8*8＝2112 |
| ??12 | ??8 | ??2^12*8＝32768 | ??256*12+256*8＝5120 | ??256*8+8*8＝2112 |
| ??16 | ??8 | ??2^16*8＝524288 | ??256*16+256*8＝6144 | ??256*8+8*8＝2112 |
| ??16 | ??12 | ??2^16*12＝786432 | ??256*16+4096*12＝114688 | ??256*8+8*8＝2112 |
| ??16 | ??16 | ??2^16*16＝1048576 | ??256*16+63536*16＝1052672 | ??256*8+8*8＝2112 |
Table 2
In addition, the present invention reduces the required time of mapping of tabling look-up, and compared with the two traditional stages mapping of tabling look-up, need once look into and to add Maqu line form, so the present invention is applicable in the high speed scanner.
| Curve tables | The slope form | Total memory space | |||
| MO | Storage space | M1 | ?M0 | Storage space | |
| ?8 | ?256*8 | ?3 | ?8 | ?2^3*8＝64 | ?256*8+64＝2112 |
| ?8 | ?256*8 | ?4 | ?16 | ?2^4*16＝256 | ?256*8+256＝2304 |
| ?12 | ?256*12 | ?3 | ?8 | ?2^3*8＝64 | ?256*12+64＝3136 |
| ?12 | ?256*12 | ?4 | ?16 | ?2^4*16＝256 | ?256*12+256＝3328 |
| ?16 | ?256*16 | ?3 | ?8 | ?2^3*8＝64 | ?256*16+64＝4160 |
| ?16 | ?256*16 | ?4 | ?16 | ?2^4*16＝256 | ?256*16+256＝4352 |
More than explanation only is better embodiment of the present invention, is not to be used for limiting protection scope of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all is included in protection scope of the present invention.
Claims (10)
1. method of in camera system, tabling look-up, it is characterized in that: this method comprises at least:
Receive a digital signal, this digital signal has a high-order portion and a low portion;
Carry out mapping look-up of table with a curve tables, this high-order portion of handling this digital signal is to obtain a high signal;
With this high-order portion of slope form processing section to obtain a factor;
This low portion and the factor of this digital signal of computing are to obtain a low level signal;
In conjunction with this high signal and this low level signal to obtain an output signal.
2. method of tabling look-up in camera system according to claim 1 is characterized in that: this high-order portion comprises a highest order of this digital signal at least.
3. method of tabling look-up in camera system according to claim 1 is characterized in that: this low portion comprises a lowest order of this digital signal at least.
4. method of tabling look-up in camera system according to claim 1 is characterized in that: this high-order portion of processing section comprises at least:
One curve is divided into a plurality of differential sections, and this curve is relevant with a plurality of maps values in this curve tables;
Produce a plurality of slope numerical value according to these differential sections;
Store these slope numerical value in this slope form with as this this high-order portion of mapping part.
5. method of tabling look-up in camera system according to claim 4 is characterized in that: this curve comprises that at least one adds the Maqu line, in order to add the agate revisal as this camera system.
6. mapping look-up of table device that in camera system, reduces memory usage, it is characterized in that: this device comprises at least:
One high-order mapping device shines upon a high-order portion of this digital signal to produce a high signal in order to reception;
One low level arithmetic unit, in order to receive and a low portion of this digital signal of computing to export a low level signal;
One coupling apparatus is in order to output signal to a controller in conjunction with this high signal and this low level signal to export one.
7. the mapping look-up of table device that in camera system, reduces memory usage according to claim 6, it is characterized in that: this low level arithmetic unit comprises at least:
One section factor mapping device is in order to shine upon this high-order portion and a slope form.To export a factor;
Arithmetic unit is in order to carry out multiplying with this factor and this low portion.
8. the mapping look-up of table device that in camera system, reduces memory usage according to claim 6, it is characterized in that: this slope form comprises a plurality of slope numerical value at least, and these slope numerical value one are added the Maqu line and obtain by what differential stored in this high position mapping device.
9. the mapping look-up of table device that reduces memory usage in camera system according to claim 8, it is characterized in that: this adds the Maqu line and is divided into a plurality of differential sections with these slope numerical value of computing.
10. the storage in a camera system is adorned, and this storage device is responsible for mapping look-up of table and is handled, and it is characterized in that: this storage device is enough to carry out the following step:
Receive a digital signal, this digital signal has a high-order portion and a low portion;
Carry out mapping look-up of table with a curve tables, the high-order portion of handling this digital signal is to obtain a high signal;
With this high-order portion of slope form processing section to obtain a factor;
This low portion of this digital signal of computing and this factor are to obtain a low level signal;
In conjunction with this high signal and this low level signal, to obtain an output signal.
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|---|---|---|---|
| CN01119826.5A CN1394077A (en) | 2001-06-29 | 2001-06-29 | Device and method for mapping look-up of table in photographic system |
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|---|---|---|---|
| CN01119826.5A CN1394077A (en) | 2001-06-29 | 2001-06-29 | Device and method for mapping look-up of table in photographic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105632425A (en) * | 2014-10-29 | 2016-06-01 | 新相微电子（开曼）有限公司 | Digital gamma correction method and digital gamma correction circuit based on thin-film transistor display driving |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105632425A (en) * | 2014-10-29 | 2016-06-01 | 新相微电子（开曼）有限公司 | Digital gamma correction method and digital gamma correction circuit based on thin-film transistor display driving |
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