CN101472057A - Image corrective system and image viewfinding device applying the system and image corrective method - Google Patents
Image corrective system and image viewfinding device applying the system and image corrective method Download PDFInfo
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- CN101472057A CN101472057A CNA200710173420XA CN200710173420A CN101472057A CN 101472057 A CN101472057 A CN 101472057A CN A200710173420X A CNA200710173420X A CN A200710173420XA CN 200710173420 A CN200710173420 A CN 200710173420A CN 101472057 A CN101472057 A CN 101472057A
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Abstract
The invention provides an image correcting system, an image acquisition device for applying the image correcting system and an image correcting method thereof. The image correcting system is arranged in the image acquisition device, the image acquisition device comprises an image sensing element, and the image sensing element generates a plurality of pixel signals corresponding to the scanning line images. The image correcting system comprises a storage unit, a decompression unit and a correcting processing unit, wherein, the storage unit is used for storing a plurality of compressed gain signals, the decompression unit is used for receiving the compressed gain signals to generate a plurality of gain signals, the gain signals correspond with the pixel signals one by one, and the correcting processing unit receives the pixel signals and the corresponding gain signals, and adjusts the pixel signals according to the gain signals to generate the corrected pixel signals.
Description
Technical field
The present invention relates to a kind of image correcting system and image correcting method thereof, and be particularly related to a kind of image correcting system and image correcting method thereof of image capture unit.
Background technology
In the field of photoinduction device, (Charge Couple Device CCD) has been the favorite of industry to charge coupled device far and away.On image capture units such as digital camera, digital camera, scanner or network video equipment are used, charge coupled device has outstanding performance, it provides color high-quality and image high-resolution meeting the need of market, thereby becomes the photoinduction device that the most widely uses now.So, under a large amount of market demands, how to reduce the application element thereof production cost of charge coupled device and periphery thereof, be the problem that industry is concerned about the most.
Charge coupled device is made up of numerous small photosensitive units, and this has also represented, and the photoperceptivity of each photosensitive unit is also inequality, thereby produces zonal image sensing difference, causes verily producing the signal of video signal that approaches raw video most.This phenomenon be called pixel response inhomogeneous (photo-response non-uniformity, PRNU).For instance, when image capture unit acquisition a blank sheet of paper, can find the brightness disproportionation one of some pixel.Therefore, in order to overcome the problem of PRNU, traditional image capture unit is taked different compensate, just gain calibration at the photoperceptivity of different photosensitive units.Gain calibration is to join to give gain signal of each photosensitive unit, with the deviation of compensation photoperceptivity.Especially under the high-resolution market demand now, make the photosensitive unit quantity that will use increase, relatively, the quantity of gain signal is just many more.Because gain signal is in the internal memory that is stored in advance in the image capture unit, when gain signal is many more, it is just big more to store the needed memory size of gain signal.In other words, production cost will promote widely.In addition, when photosensitive unit quantity is many more, also make the time of gain calibration long more, processor need constantly read the gain signal in the internal memory, causes gain signal to continue the committed memory frequency range.Because image capture unit can be carried out a plurality of handling procedures usually simultaneously; or carry out image capture and IPF simultaneously; each handling procedure all has the frequency range demand; therefore; if the ability of enhancement process device or increase the internal memory frequency range not; just can't keep the speed of image capture and output, to meet user's requirement.No matter but be to increase memory size, enhancement process device ability or increase the internal memory frequency range, these all are the production costs of increase industry, and do not meet very much economic benefit.
Summary of the invention
The present invention relates to a kind of image correcting system and image capture unit and the image correcting method thereof of using it.The present invention is stored in the gain signal that compresses in the internal memory of image capture unit by the design of compression and decompression, to reduce the memory size that must use.In addition, when wanting the signal of correcting image, only need read the gain signal of compression and, can produce gain signal apace, to reduce the internal memory frequency range that must use through decompression unit.Except promoting treatment effeciency, also can reduce the production cost of enterprise like this.
The present invention proposes a kind of image correcting system, in order to be installed in the image capture unit.Wherein image capture unit comprises Image Sensor, and Image Sensor produces a plurality of picture element signals of corresponding scan line image.Image correcting system comprises storage element, decompression unit and correction processing unit.Storage element is in order to store a plurality of compression gains signals.Decompression unit connects storage element, and in order to receive the compression gains signal and these compression gains signals that decompress producing a plurality of gain signals, and these gain signals are corresponding with each picture element signal one by one.Correction processing unit connects Image Sensor and decompression unit, to receive these picture element signals and corresponding gain signal thereof, and remove to adjust each picture element signal according to its pairing gain signal of each picture element signal, to produce a plurality of correction pixels signals corresponding with each picture element signal.
The present invention proposes a kind of image capture unit, and image capture unit comprises Image Sensor and image correcting system at least.Image Sensor produces a plurality of picture element signals of corresponding scan line image.Image correcting system comprises storage element, decompression unit and correction processing unit.Wherein storage element is in order to store a plurality of compression gains signals.Decompression unit connects storage element, and in order to receive compression gains signal and these compression gains signals that decompress to produce a plurality of gain signals, these gain signals are corresponding with each picture element signal one by one.Correction processing unit connects Image Sensor and decompression unit, to receive these picture element signals and corresponding gain signal thereof, and remove to adjust each picture element signal according to its pairing gain signal of each picture element signal, to produce a plurality of correction pixels signals corresponding with each picture element signal.
The present invention reintroduces a kind of image correcting method of image capture unit, comprises the following steps.At first, pick-up image is to produce a plurality of picture element signals.Then, a plurality of compression gains signals that decompress, to produce a plurality of gain signals, these gain signals are corresponding with each picture element signal one by one.Then, remove to adjust each picture element signal, to produce a plurality of correcting image signals corresponding with each picture element signal according to its pairing gain signal of each picture element signal.
For foregoing of the present invention can be become apparent, a preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below.
Description of drawings
Fig. 1 shows the functional block diagram according to the image capture unit of preferred embodiment of the present invention.
Fig. 2 shows the flow chart according to the image correcting method of preferred embodiment of the present invention.
Fig. 3 shows the functional block diagram according to a kind of image capture unit of the present invention.
Embodiment
Please refer to Fig. 1, it shows the image capture unit functional block diagram according to preferred embodiment of the present invention.Image capture unit 100 as shown in Figure 1 comprises Image Sensor 110, image correcting system 130 and special purpose integrated circuit (ASIC) 150.Image Sensor 110 produces a plurality of picture element signals of corresponding scan line image.Wherein image correcting system 130 comprises correction processing unit 132, decompression unit 134 and storage element 136.In image correcting system 130, storage element 136 is in order to store a plurality of compression gains signals.Decompression unit 134 connects storage elements 136, and in order to receive these compression gains signals and these compression gains signals that decompress to produce a plurality of gain signals, wherein gain signal is corresponding with each picture element signal one by one.Correction processing unit 132 connects Image Sensor 110 and decompression unit 134, to receive picture element signals from Image Sensor 110 and from decompression unit 134 receiving gain signals, and remove to adjust each picture element signal according to its pairing gain signal of each picture element signal, to produce a plurality of correction pixels signals corresponding with each picture element signal.The special purpose integrated circuit 150 of image capture unit 100 is in order to receive correction pixels signal.Perhaps the picture element signal exported of Image Sensor 110 can be temporarily stored in earlier in the storage element 136, and correction processing unit 132 receives these picture element signals from storage element 136 again.
Please refer to Fig. 2, it shows the image correcting method flow chart according to preferred embodiment of the present invention.Image correcting method as shown in Figure 2 comprises the following steps.At first, shown in step 201, acquisition scan line image is to produce a plurality of picture element signals.Then, shown in step 202, a plurality of compression gains signals that decompress are to produce a plurality of gain signals.These gain signals are corresponding with each picture element signal seriatim.Then, shown in step 203, remove to adjust each picture element signal, to produce a plurality of correcting image signals corresponding with each picture element signal according to its pairing gain signal of each picture element signal.Then, shown in step 204, export the correction pixels signal to special purpose integrated circuit 150.Therefore, in step 203, adjust picture element signal one by one, to produce correcting image signal according to picture element signal and gain signal.
In the present embodiment, preferable and non-exclusively, (Charge Couple Device is CCD) as the Image Sensor 110 of image capture unit 100 to select charge coupled device for use.Certainly to those skilled in the art, must understand Image Sensor 110 and also can be the contact-type Image Sensor (Contact Image Sensor, CIS) or other Photosensing Units.
Wherein, the Image Sensor 110 of image capture unit 100 has a plurality of sensing cells, and gain signal is also corresponding one to one with sensing cell.In other words, each sensing cell has a gain signal.Therefore, in storage element 136, the shared capacity of gain signal is directly proportional with the quantity of sensing cell.
Image Sensor 100 produces corresponding picture element signal by different sensing cells to the diverse location on the image.And the gain signal after decompressing is designed at the different pixels signal, so, when correction processing unit 132 is adjusted picture element signal, just produced the adjusted correction pixels of each picture element signal signal according to each picture element signal and corresponding gain signal thereof.
In addition, in image capture unit 100, can install analogue signal processor.Please refer to Fig. 3, it shows according to a kind of image capture unit of the present invention.Fig. 3 and Fig. 1 do not exist together, and are that the image capture unit 100 ' of Fig. 3 has analogue signal processor 160.So the element of Fig. 3 is continued to use the label of the similar elements of Fig. 1, and its similar elements has identical functions, so repeat no more.When Image Sensor 110 output pixel signals, with the picture element signal digitlization, become digital signal by analogue signal processor 160, the picture element signal that correction processing unit 132 is received is a digital signal.The advantage that picture element signal is converted to digital signal is to be that the accuracy of carrying out timing can improve.Analogue signal processor 160 for example be analog front end processor (Analog Front End, AFE) or analog/digital converter (Analog/DigitalConverter, ADC).
For embodiments of the invention, be that gain signal is compressed into packed data in advance, and be stored in the storage element 136.When wanting to use gain signal, decompression unit 134 packed data that will decompress is to produce gain signal.For example be circuit design, make packed data can convert gain signal apace to by decompressing.In storage element, directly store a large amount of gain signals and directly read a large amount of gain signals for tradition, memory size and internal memory frequency range are used inadequately so that regardless of expense go to increase memory size, and must adopt internal memory with a large amount of pins.For the purpose of the present invention, can reduce the memory headroom of gain signal by decompression unit, thereby need not adopt internal memory with a large amount of pins.The present invention can effectively solve memory size and the not enough problem of using of internal memory frequency range, and saves entreprise cost widely.
In sum, though the present invention with the preferred embodiment disclosure as above, yet it is not in order to limit the present invention.Those skilled in the art should make various variations and improvement under the situation that does not break away from the spirit and scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the scope that appending claims was defined.
The main element symbol description
100,100 ': image capture unit
110: Image Sensor
120: signal processing unit
130: image correcting system
132: correction processing unit
134: decompression unit
136: storage element
150: the special purpose integrated circuit
160: analogue signal processor
Claims (17)
1. image correcting system, in order to be installed in the image capture unit, it is characterized in that described image capture unit comprises Image Sensor, described Image Sensor produces a plurality of picture element signals corresponding to the scan line image, and described image correcting system comprises:
Storage element is in order to store a plurality of compression gains signals;
Decompression unit connects described storage element, in order to receive described a plurality of compression gains signal and the described a plurality of compression gains signal that decompresses to produce a plurality of gain signals, described a plurality of gain signals are corresponding one by one with described a plurality of picture element signals; And
Correction processing unit, connect described Image Sensor and described decompression unit, receive described a plurality of picture element signal and described a plurality of gain signal, described correction processing unit also removes to adjust described a plurality of picture element signal according to described a plurality of gain signals, to produce a plurality of correction pixels signals corresponding one by one with described each picture element signal.
2. image correcting system as claimed in claim 1, it is characterized in that, described Image Sensor has a plurality of sensing cells, and described a plurality of gain signals are corresponding one by one with described a plurality of sensing cells, and described Image Sensor produces described a plurality of picture element signal by described a plurality of sensing cells.
3. image correcting system as claimed in claim 1 is characterized in that, described image capture unit comprises that also the special purpose integrated circuit is in order to receive described a plurality of signal of correction pixels.
4. image correcting system as claimed in claim 1, it is characterized in that, described image capture unit also comprises analogue signal processor, and in order to the described a plurality of picture element signal digitlizations with Image Sensor output, described a plurality of picture element signals that described correction processing unit received are digital signal.
5. image correcting system as claimed in claim 4 is characterized in that, described analogue signal processor is analog front end processor or analog/digital converter.
6. image correcting system as claimed in claim 1 is characterized in that, the described Image Sensor of described image capture unit is charge coupled device or contact-type Image Sensor.
7. image correcting system as claimed in claim 1 is characterized in that described correction processing unit comprises multiplier.
8. an image capture unit is characterized in that, comprising:
Image Sensor, described Image Sensor produces a plurality of picture element signals corresponding to the scan line image; And
Image correcting system comprises:
Storage element is in order to store a plurality of compression gains signals;
Decompression unit connects described storage element, in order to receive described a plurality of compression gains signal and the described a plurality of compression gains signal that decompresses to produce a plurality of gain signals, described a plurality of gain signals are corresponding one by one with described a plurality of picture element signals; And
Correction processing unit, connect described Image Sensor and described decompression unit, receive described a plurality of picture element signal and described a plurality of gain signal, described correction processing unit also removes to adjust described a plurality of picture element signal according to described a plurality of gain signals, to produce a plurality of correction pixels signals corresponding one by one with described each picture element signal.
9. image capture unit as claimed in claim 8, it is characterized in that, described Image Sensor has a plurality of sensing cells, and described a plurality of gain signals are corresponding one by one with described a plurality of sensing cells, and described Image Sensor produces described a plurality of picture element signal by described a plurality of sensing cells.
10. image correcting system as claimed in claim 8 is characterized in that, described image capture unit comprises that also the special purpose integrated circuit is in order to receive described a plurality of signal of correction pixels.
11. image correcting system as claimed in claim 8, it is characterized in that, described image capture unit also comprises analogue signal processor, in order to the described a plurality of picture element signal digitlizations with described Image Sensor output, described a plurality of picture element signals that described correction processing unit received are digital signal.
12 image capture units as claimed in claim 11 is characterized in that, described analogue signal processor is analog front end processor or analog/digital converter.
13. image capture unit as claimed in claim 8 is characterized in that, described Image Sensor is charge coupled device or contact-type Image Sensor.
14. image capture unit as claimed in claim 8 is characterized in that, described correction processing unit comprises multiplier.
15. the image correcting method of an image capture unit is characterized in that, comprising:
(a) acquisition scan line image is to produce a plurality of picture element signals;
(b) a plurality of compression gains signals of decompression, to produce a plurality of gain signals, described a plurality of gain signals are corresponding one by one with described a plurality of picture element signals; And
(c) adjust described a plurality of picture element signal according to described a plurality of gain signals, to produce a plurality of signals of correcting image corresponding one by one with described each picture element signal.
16. image correcting method as claimed in claim 15 is characterized in that, in described step (c), adjusts described a plurality of picture element signal one by one according to described a plurality of picture element signals and described a plurality of gain signal, to produce described a plurality of signal of correcting image.
17. image correcting method as claimed in claim 15 is characterized in that, (c) also comprises afterwards in step:
(d) the described a plurality of signals of correction pixels of output are to the special purpose integrated circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200710173420XA CN101472057A (en) | 2007-12-27 | 2007-12-27 | Image corrective system and image viewfinding device applying the system and image corrective method |
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| CNA200710173420XA CN101472057A (en) | 2007-12-27 | 2007-12-27 | Image corrective system and image viewfinding device applying the system and image corrective method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110507287A (en) * | 2019-08-29 | 2019-11-29 | 付现敏 | A kind of Urology Surgery intelligent digital image processing system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110507287A (en) * | 2019-08-29 | 2019-11-29 | 付现敏 | A kind of Urology Surgery intelligent digital image processing system and method |
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Open date: 20090701 |