CN1065099C - Image signal processor - Google Patents

Image signal processor Download PDF

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Publication number
CN1065099C
CN1065099C CN971176132A CN97117613A CN1065099C CN 1065099 C CN1065099 C CN 1065099C CN 971176132 A CN971176132 A CN 971176132A CN 97117613 A CN97117613 A CN 97117613A CN 1065099 C CN1065099 C CN 1065099C
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signal
technicolo
image signal
analog
signal processor
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CN1208303A (en
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欧阳启彬
蔡嘉林
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Transpacific IP Pte Ltd.
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Transpacific IP Ltd
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Abstract

The present invention relates to an image signal processor which comprises a photosensitive element, a proposing processing circuit, an analog-to-digital converter, a postposition processing device and a storage body, wherein the proposing circuit comprises a multi-path conveyor and a regulator; the postposition processing device comprises a compensator and an enhancement device which also comprises a corresponding table according to a gamma curved line so as to correspond to each compensated coloured electric signal to a corresponding coloured electric signal. Besides, the number of the corresponding colour electric signals is less than that of the compensated colour electric signals. Therefore, the present invention can save memory space. The memory body is stored in a sequence mode. The present invention has the advantages of fast image signal processing speed, high quality and low cost.

Description

Image signal processor
The present invention relates to a kind of image signal processor.
Image processor is meant uses reflection ray and light-sensitive element (for example charge coupled cell), produces signal of video signal, and this signal of video signal is as required further through handling, storing and show.Image scanning device, camera and facsimile machine promptly are the exemplary that modern offices and house signal of video signal are handled application.
Shown in Figure 1 is the calcspar of traditional image processing system.After the reflection of image on the file via the irradiation of fluorescent tube 10 and minute surface 11, focused on by lens 12.After the image of this focusing is detected by light-sensitive element (charge coupled cell) 13, handle via a preposing signal process circuit 14 (being generally the DC current gain amplifier) again.Then, signal of video signal converts digital form to by analog to digital converter (ADC) 15, and wherein the reference signal of analog to digital converter 15 input system is provided by 16 of digital to analog converters (DAC).Above-mentioned digital signal is handled via rearmounted processing unit 17 (for example gamma γ (Gamma) processor) again, and is last, it is stored in the memory buffer (abbreviating memory as) 18, to do further processing or demonstration again.
Traditional image processing system has following shortcoming.The first, when the bit number of analog to digital converter 15 increased according to system requirements, the bit number of digital to analog converter 16 also will and then increase.Because after the bit number of digital to analog converter 16 increased, its inner equivalent resistance also and then increased, thereby makes that the speed of whole system is slack-off.The second, when the bit number increase of digital to analog converter 16, then cost and then increases, and this element also is difficult for obtaining on market.The 3rd, because the reaction time of digital to analog converter 16 is longer usually, therefore by the reference signal of digital to analog converter 16 with adjustment analog to digital converter 15, the speed that will slow down analog to digital converter 15 greatly.In addition, constantly the reference signal that changes more can produce the interference signal of system, thereby further causes the shakiness of system.
In Fig. 1, the circuit from preposing signal process circuit 14 to memory between 18 all is to be used to handle colour signal (promptly red, edge, indigo plant) a kind of signal wherein.If handle other two kinds of color signals, need to increase again two groups of same circuit, yet so will consume many circuit and power.
The object of the present invention is to provide a kind of speed of the processing image that can overcome above-mentioned shortcoming very fast, quality better and the also not high image signal processor of cost.
The object of the present invention is achieved like this, and a kind of image signal processor is characterized in, it comprises: photosensitive components converts the strength signal of the scintigram point of the picture behind the reflect focalization to a plurality of technicolo signals; Multiplex's device is connected with described photosensitive components, and should a plurality of technicolo signals multipath conversion in addition; Adjusting device is connected with described multiplex's device, is used to adjust the DC potential of the colour signal of above-mentioned multichannel output; Analog to digital converter is connected with described adjusting device, and being used for this adjusted analog color signal of conversion becomes digital signal; Compensation arrangement is connected with described analog to digital converter, is used to compensate the shade line phenomenon that above-mentioned digitized colour signal is caused because of these system's other parts; Intensifier is connected with described compensation arrangement, according to the intensity of the colour signal after the above-mentioned compensation, to strengthen the technicolo signal after part should compensate; And memory is connected with described intensifier, in order to storing the colour signal after this enhancing, and stores in the sequence mode.
Above-mentioned image signal processor, wherein, intensifier comprises corresponding intrument at least, and this corresponding intrument is according to gamma curve, with the technicolo signal of corresponding each technicolo signal to a correspondence that should compensate.
Above-mentioned image signal processor, wherein, the corresponding method that corresponding intrument adopted is an interpolation method.
Above-mentioned image signal processor, wherein, corresponding technicolo signal is stored in and stores in the body, and the number of technicolo signal that should correspondence is less than the number of the technicolo signal of this compensation.
Above-mentioned image signal processor, wherein, photosensitive components contains several light-sensitive elements.
Above-mentioned image signal processor, wherein, several light-sensitive elements are a row charge coupled cell.
Above-mentioned image signal processor, wherein, multiplex's device comprises a plurality of multiplexers, the multipath conversion of the red, green, blue signal of its technicolo signal is controlled by two control signals.
Above-mentioned image signal processor, wherein, adjusting device comprises an operational amplification circuit that is used to import a technicolo signal and the reference signal after the multipath conversion and produces an amplifying signal at least; Reach, be used to adjust the DC potential of this amplifying signal, make its DC current gain amplifying circuit in the opereating specification of analog to digital converter.
Above-mentioned image signal processor wherein, installs one and strengthens and weaken the technicolo signal that processor strengthens with further processing between intensifier in the after-treatment device and the described memory.
Above-mentioned image signal processor, wherein, reinforcement and reduction processor comprise strengthening and processing device at least, are used to emphasize the partly intensity of the technicolo signal of this enhancing.
Above-mentioned image signal processor, wherein, reinforcement and reduction processor comprise the reduction processing unit at least, are used to weaken the partly intensity of the technicolo signal of this enhancing.
In this device owing to behind light-sensitive element, adopted multiplex's device, compensating circuit and intensifier behind analog to digital converter, have been adopted, therefore very fast to the speed of institute's signal of video signal processing to be processed, quality is also higher and do not increase more circuit, so cost is not high yet, therefore, this device can be made various types of image processing usefulness.
Details are as follows to structure of the present invention below by the accompanying drawing of an embodiment:
Fig. 1 is the calcspar of traditional image processing system.
Fig. 2 is the block diagram of one of embodiment of the invention.
Fig. 3 is the signal waveforms of multiplex's device among Fig. 2.
To be gamma (Gamma) value strengthen curve chart less than one signal to Fig. 4.
To be gamma (Gamma) value strengthen curve chart greater than one signal to Fig. 5.
Fig. 6 is an example of interpolating method.
The calcspar of one of embodiment of the invention shown in Figure 2.The scintigram point of picture or file is detected by the photosensitive components (CCD) 20 (using charge coupled cell in the present embodiment) of row via after reflection, focusing on, thereby the intensity-conversion of image is become colored (red, green, blue) electronic signal.This technicolo signal is distributed by multiplex's device 22 again, makes red, green, blue be inserted into the adjacent position in the mode of sequence.The output system of multiplex's device 22 is determined that by selection signal S0, S1 as shown in Figure 3, wherein signal C is the signal of video signal from charge coupled cell 20, and the part of its high potential system represents one to scan the starting point that figure is ordered.When " S0 ", " S1 " are " 0 " " 0 ", then pass through danger signal; When " S0 ", " S1 " are " 0 " " 1 ", then pass through green; And work as " S0 ", when " S1 " is " 1 " " 0 ", then pass through blue signal.As everyone knows, the selection signal number of Fig. 3 not necessarily will be two, and the order passed through of colour signal also not necessarily need be according to order shown in the embodiment.
Adjust circuit 24 in order to adjust, make it meet the optimum operation scope of ensuing analog to digital converter (ADC) 26 by the DC potential of multiplex technicolo signal.In the present embodiment, have the operational amplifier 240 of feedback loop, according to one with reference to direct voltage 242 to produce amplifying signal.The gain of this amplifying signal is then adjusted by gain amplifier 244.
Analog to digital converter (ADC) the 26th, the technicolo signal of adjusting the back in order to conversion makes it to become digital form.The bit number of analog to digital converter (ADC) 26 then decides according to the accuracy requirement and the cost of system.
The image that generally scans all can have the phenomenon of shade line (Shading); the common meeting of these lines is regional dark or light than vicinity; sometimes in addition the concealed wire or the light line that have a whole band (band) take place, thereby make that the image that shows or print out can't discrimination.This kind shade line phenomenon is normally caused by the heterogeneity light reflection (photo-response non-uniformity) of the distortion of the defective of light source, mirror, lens or charge coupled cell or light, is perhaps caused by the dust in system aging or the environment.This kind shade line phenomenon can be compensated by compensating circuit 28 (being shade line phenomenon processor among Fig. 2).Traditional shade line phenomenon compensating circuit and method can be used for doing this kind compensation.
Intensifier 30 is used gamma γ (Gamma) circuit in the present embodiment, according to the intensity of the compensate for color signal of telecommunication that comes self-compensation circuit 28, to strengthen the technicolo signal after part compensates.Shown in Figure 4 one has gamma (Gamma) value less than one curve, shows near being positioned at 1024 bright signal thereby being enhanced.Opposite, shown in Figure 5 one has gamma γ (Gamma) value greater than one curve, show lean on carry in 0 dark signal thereby be enhanced.Tradition gamma γ (Gamma) circuit 30 is with corresponding (mapping) method, according to gamma γ (Gamma) curve, comes the enhancing signal of each compensate for color signal to a correspondence of self-compensation circuit 28 with correspondence.After system's bit number increased, the corresponding data (being correspondence table) that is stored in the memory block will become excessive.In order to overcome the problems referred to above, in the present embodiment, only use tradition half or 1/4th corresponding data.For the corresponding data that can't in correspondence table, find, then use interpolating method to produce the corresponding data of gamma (Gamma).An example of interpolating method shown in Figure 6, wherein X1, X2 and Y1, Y2 are respectively known input and output.For an input value X that can't find in correspondence table, its corresponding output valve Y can be produced by following formula:
Y=[(X-X1)／(X2-X1)] *(Y2-Y1)+Y1
Following formula can be obtained by the hardware approach combination, and it has fast speeds.Yet,, can reach with software approach if speed is not very big considering.
Also can strengthen and reduction circuit 32 in installing one behind the intensifier circuit in after-treatment device and between the memory, reinforcement (highlight) or reduction (shadow) effect are the enhancing colour signals that is used for further being handled from gamma γ (Gamma) circuit 30.Except strengthening (highlight) or reduction (shadow) circuit, put treatment circuit after other tradition and also can be used for this and make appropriate signals and handle.
At last, the processed signal of finishing then be stored in memory 34 (random access memory for example, RAM) in.Because the signal of video signal from charge coupled cell 20 is distributed by multiplex's device 22, therefore when being stored in the memory 34 just with R1G1B1R2B2G2 ... the sequence mode store, wherein R1 represents the danger signal that first figure is ordered, the green that on behalf of first figure, G1 then order, the blue signal that on behalf of first figure, B1 then order, by that analogy.Yet traditional image processing system is owing to there is no multiplex distribution, so its signal of video signal is with R1R2R3 ... RnG1G2G3 ... GnB1B2B3 ... the mode of Bn stores.

Claims (11)

1. image signal processor is characterized in that it comprises:
Photosensitive components converts the strength signal of the scintigram point of the picture behind the reflect focalization to a plurality of technicolo signals;
Multiplex's device is connected with described photosensitive components, and should a plurality of technicolo signals multipath conversion in addition;
Adjusting device is connected with described multiplex's device, is used to adjust the DC potential of the colour signal of above-mentioned multichannel output;
Analog to digital converter is connected with described adjusting device, and being used for this adjusted analog color signal of conversion becomes digital signal;
Compensation arrangement is connected with described analog to digital converter, is used to compensate the shade line phenomenon that above-mentioned digitized colour signal is caused because of these system's other parts;
Intensifier is connected with described compensation arrangement, according to the intensity of the colour signal after the above-mentioned compensation, to strengthen the technicolo signal after part should compensate; And
Memory is connected with described intensifier, in order to storing the colour signal after this enhancing, and stores in the sequence mode.
2. image signal processor according to claim 1 is characterized in that described intensifier comprises corresponding intrument at least, and this corresponding intrument is according to gamma curve, with the technicolo signal of corresponding each technicolo signal to a correspondence that should compensate.
3. image signal processor according to claim 2 is characterized in that the corresponding method that described corresponding intrument adopted is an interpolation method.
4. image signal processor according to claim 2 is characterized in that, the technicolo signal of described correspondence is stored in the memory, and the number of technicolo signal that should correspondence is less than the number of the technicolo signal of this compensation.
5. according to claim 1 or 4 described image signal processors, it is characterized in that described photosensitive components contains several light-sensitive elements.
6. image signal processor according to claim 5 is characterized in that, described several light-sensitive elements are a row charge coupled cell.
7. according to claim 1 or 4 described image signal processors, it is characterized in that described multiplex's device comprises a plurality of multiplexers, the multipath conversion of the red, green, blue signal of its technicolo signal is controlled by two control signals.
8. according to claim 1 or 4 described image signal processors, it is characterized in that described adjusting device comprises an operational amplification circuit that is used to import a technicolo signal and the reference signal after the multipath conversion and produces an amplifying signal at least; And
Be used to adjust the DC potential of this amplifying signal, make its DC current gain amplifying circuit in the opereating specification of analog to digital converter.
9. according to claim 1 or 4 described image signal processors, it is characterized in that, install one between intensifier in described after-treatment device and the described memory and strengthen and weaken the technicolo signal that processor strengthens with further processing.
10. image signal processor according to claim 9 is characterized in that, described reinforcement and reduction processor comprise strengthening and processing device at least, are used to emphasize the partly intensity of the technicolo signal of this enhancing.
11, image signal processor according to claim 9 is characterized in that, described reinforcement and reduction processor comprise the reduction processing unit at least, are used to weaken the partly intensity of the technicolo signal of this enhancing.
CN971176132A 1997-08-13 1997-08-13 Image signal processor Expired - Fee Related CN1065099C (en)

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CN1065099C true CN1065099C (en) 2001-04-25

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613098A2 (en) * 1993-02-25 1994-08-31 Kabushiki Kaisha Toshiba Image processing apparatus and method of controlling the same
EP0701362A2 (en) * 1994-08-26 1996-03-13 Eastman Kodak Company Color image reproduction of scenes with color enhancement and preferential tone mapping

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613098A2 (en) * 1993-02-25 1994-08-31 Kabushiki Kaisha Toshiba Image processing apparatus and method of controlling the same
EP0701362A2 (en) * 1994-08-26 1996-03-13 Eastman Kodak Company Color image reproduction of scenes with color enhancement and preferential tone mapping

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