CN102104707B - Contact type image scanning device and scanning control method of same - Google Patents
Contact type image scanning device and scanning control method of same Download PDFInfo
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Abstract
The invention provides a contact type image scanning device and a scanning control method of the same. Scanning position errors of three-primary colors are reduced through controlling the lighting sequence and the time history of red, green and blue LED light sources so as to improve the color difference phenomenon that colors can not be completely aligned due to image scanning; meanwhile, an output result different from a RGB (Red, Blue and Green) color space, for example, a YCbCr color space, can be provided according to use requirements.
Description
Technical field
The present invention relates to a kind of image-scanning device and scan control method thereof, relate in particular to a kind of contact type image scanning means and scan control method thereof.
Background technology
Contact-type image sensor (Contact Image Sensor, CIS) is a kind of of linear sensor, can be used for image or the file on plane are scanned into electronic format, so that the photoelectric cell that stores, shows, processes or transmit.The modular design that its maximum characteristic is integrated not only makes application product have light, thin characteristic, and because assembling easily, also can be saved production cost.
Fig. 1 is the configuration diagram that the contact-type image sensor of a contact type image scanning means carries out image scanning.This contact-type image sensor comprises a red-light LED 10, a green light LED 11, a blue-ray LED 12, a light-guide device 13, a set of lenses 14 and a light-sensing element array 15.Wherein this light-sensing element array 15 is by the action of one scan starting impulse; And on the other hand, in this contact-type image sensor motion scan, red-light LED 10, green light LED 11 and 12 of blue-ray LEDs that should light-sensing element array 15 be sequentially lighted between each sweep-initiating pulse respectively.And each LED during lighting emitted light all reflect by these light-guide device 13 guiding directives one original copy 20 surfaces to be scanned, focused on this light-sensing element array 15 by this set of lenses 14 again.Whereby, this contact-type image sensor can move according to linear direction and finish horizontal scanning, and learns trichromatic image information on this scan line.Fig. 2 further discloses light-sensing element array sweep-initiating pulse and the primitive colours LED of known technology and lights the time-histories graph of a relation.As shown in Figure 2, when red-light LED 10 starts prior to the first sweep-initiating pulse, light time T r section; Then green light LED 11 when the second sweep-initiating pulse starts, is lighted time T g section again; Thereafter, blue-ray LED 12 when the 3rd sweep-initiating pulse starts, is lighted time T b section again.Because contact-type image sensor continues linear translation when scanning motion, thus the red image that this light-sensing element array 15 reads at the first scanning impulse, the path difference when green image that reads with the second scanning impulse has a section; And the red image that reads at the first scanning impulse, the path difference when blue image that reads with the 3rd scanning impulse also has two sections.So when continuing the motion scan position along with contact-type image sensor, three-color light source is sequentially in time difference that different starting impulse sequences are lighted, to cause three color scanning site errors and make scan image produce the aberration that color is not aimed at fully, thereby cause so-called color site error (color misregistration) phenomenon.
For foregoing problems, United States Patent (USP) card US6,545,777 propositions are a kind of lights the image read-out that time-histories reduces the color site error by adjusting LED.Its light-sensing element array sweep-initiating pulse and primitive colours LED are lighted the time-histories graph of a relation as shown in Figure 3.Because the time-histories that LED lights often is less than a scanning impulse phase, therefore this known technology is then lighted the impulsive synchronization of the time started of time T g section by concluding time and green light LED that the control red-light LED is lighted time T r section, and then the color site error of each scanning yoke picture can slightly be shorter than shown in Fig. 2, also be that total period b slightly is shorter than total period a.Yet under sweep speed required faster now, the mode that this known technology provides still can cause very large error, can't satisfy the demands.
United States Patent (USP) card US7,535,606 propose the sampling method of a kind of contact-type image sensor RYB (red-luminance-blue) pattern.Fig. 4 namely discloses its light-sensing element array sweep-initiating pulse and primitive colours LED is lighted the time-histories graph of a relation.Because the conversion formula between RGB color space and YCbCr color space is: Y=0.29900 * R+0.58700 * G+0.11400 * B; Cb=-0.16874 * R-0.33126 * G+0.50000 * B=0.56433 * (B-Y); And Cr=0.50000 * R-0.41869 * G-0.08131 * B=0.71327 * (R-Y), so this known technology is lighted red-light LED and blue-ray LED after respectively at the first and the 3rd scanning impulse, and in the second scanning impulse in the phase, sequentially light ruddiness, green glow and blue light three LED, and control red-light LED and light time-histories Ty, r=0.299 * Tr, green light LED light time-histories Ty, g=0.587 * Tg and blue-ray LED are lighted time-histories Ty, and the time span ratio of b=0.114 * Tb is to know Y value.And just can be by formula Cr=0.71327 * (R-Y) after obtaining the RYB value, and Cb=0.56433 * (B-Y) is known Y, Cr, Cb value.But when practical application, this known technology still approximately has three scanning impulse phases in the color site error of every delegation image that it scans, can't reduce the time difference of lighting because of ruddiness, green glow and blue-ray LED sequence and cause the RGB scanning site error, and make scan image produce the obvious aberration that color is not aimed at fully.
Therefore, how to solve and the restriction that improves known technology and defective, and propose a kind of contact type image scanning means and scan control method thereof, real is present problem in the urgent need to address.
Summary of the invention
Main purpose of the present invention is for providing a kind of contact type image scanning means, light sequence and time-histories by control ruddiness, green glow and blue-ray LED light source, reduce trichromatic scanning position error, and then improvement because producing color, scan image the aberration phenomenon of not aiming at fully.
For reaching above-mentioned purpose, a better embodiment of the present invention comprises at least for a kind of contact type image scanning means is provided: light source cell, and the first light source, secondary light source and the 3rd light source with different colored light sources are in order to shine object surface; Control unit is connected to light source cell, in order to control the time-histories of lighting of the first light source, secondary light source and the 3rd light source; Wherein the first light source and secondary light source start respectively the first light source igniting time-histories and secondary light source and light time-histories according to sweep-initiating pulse, and secondary light source lights that time-histories starts synchronously when the first light source igniting time-histories finishes or retardation one given period between start; The first light source, secondary light source and the 3rd light source start simultaneously the first light source and light time-histories, inferior time-histories and the inferior time-histories of lighting of the 3rd light source lighted of secondary light source according to another sweep-initiating pulse; And photosensitive unit, receive light source cell shines the object surface back reflection when object surface moves image, and output image information, wherein the first light source igniting time-histories receives the first image data value, secondary light source is lighted time-histories and is received the second image data value, and lights time-histories, secondary light source and light and receive the 3rd image data value when time-histories and the 3rd light source are lighted time-histories in starting simultaneously the first light source.
A further object of the present invention is for providing a kind of scan control method of contact type image scanning means, light sequence and time-histories by control ruddiness, green glow and blue-ray LED light source, reduce trichromatic scanning position error, and then improvement because producing color, scan image the aberration phenomenon of not aiming at fully; Can provide according to user demand simultaneously to be different from the RGB color space, such as the YCbCr color space, Output rusults.
For reaching above-mentioned purpose, a better embodiment of the present invention is for providing a kind of scan control method of contact type image scanning means, at least comprise step: (a) provide the first light source, secondary light source and the 3rd light source of different colours, in order to move the line scanning irradiation of going forward side by side relative to an object surface; (b) according to sweep-initiating pulse, light the first light source, with between the first light source igniting time-histories, irradiation object surface and reflection produce the first view data; (c) when the first light source igniting time-histories finishes, light synchronously or retardation one given period between after light secondary light source, lighting between time-histories in secondary light source, irradiation object surface and reflection produce the second view data; And (d) according to another sweep-initiating pulse, light simultaneously the first light source, secondary light source and the 3rd light source, to light time-histories, the inferior time-histories of lighting of secondary light source respectively at the first light source, reach the 3rd light source and light between time-histories, the irradiation object surface also reflects generation the 3rd view data.
The present invention lights sequential and time-histories by three primary colors light sources such as control ruddiness, green glow and blue-ray LED etc., the error that on scanning position, produces to reduce the RGB three primary colors, and then improve because scan image produces color and the aberration phenomenon of not aiming at fully; Simultaneously also can provide the Output rusults that is different from RGB three color spaces according to user demand, such as YCbCr or the output of CMYB color space, this can't reach for known technology.
Description of drawings
Fig. 1: be the configuration diagram that the contact-type image sensor of a contact type image scanning means carries out image scanning.
Fig. 2: for light-sensing element array sweep-initiating pulse and the primitive colours LED of traditional scan control mode are lighted the time-histories graph of a relation.
Fig. 3: for light-sensing element array sweep-initiating pulse and the primitive colours LED of another traditional scan control mode are lighted the time-histories graph of a relation.
Fig. 4: for light-sensing element array sweep-initiating pulse and the primitive colours LED of another traditional scan control mode are lighted the time-histories graph of a relation.
Fig. 5: it is the architecture block diagram of the contact type image scanning means of announcement preferred embodiment of the present invention.
Fig. 6 A: for showing sweep-initiating pulse and the three primary colors light source igniting time-histories graph of a relation of the present invention's one better scan control method.
Fig. 6 B: for showing sweep-initiating pulse and the three primary colors light source igniting time-histories graph of a relation of another better scan control method of the present invention.
Fig. 6 C: for showing sweep-initiating pulse and the three primary colors light source igniting time-histories graph of a relation of the another better scan control method of the present invention.
Fig. 7: the scan control flow chart that is applied to the contact type image scanning means for preferred embodiment of the present invention.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
10 red-light LEDs, 11 green light LEDs
12 blue-ray LEDs, 13 light-guide devices
14 set of lenses, 15 light-sensing element array
20 original copys, 4 contact type image scanning means
40 object surfaces, 41 light source cells
411 first light sources, 412 secondary light sources
413 the 3rd light sources, 42 control units
43 photosensitive units, 44 image informations
Tr the first light source (red-light LED) is lighted time-histories
Tb secondary light source (blue-ray LED) is lighted time-histories
Tg the 3rd light source (green light LED) is lighted time-histories
Ty, the inferior time-histories of lighting of r the first light source (red-light LED)
Ty, the inferior time-histories of lighting of b secondary light source (blue-ray LED)
Ty, the inferior time-histories of lighting of g the 3rd light source (green light LED)
The G value of the R value G RGB color space of R RGB color space
The Y value of the B value Y YCbCr color space of B RGB color space
The Cr value of the Cb value Cr YCbCr color space of Cb YCbCr color space
S61～S66 process step T
1During the specific delays
Embodiment
Some exemplary embodiments that embody feature ﹠ benefits of the present invention will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations in different modes, it does not depart from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to limit the present invention.
The present invention is a kind of contact type image scanning means and scan control method thereof, by importing the scan control mechanism of particular schedule, control ruddiness, green glow and blue-ray LED three primary colors light source light sequential and time-histories, reducing trichromatic scanning position error, and then improve because scan image produces color and the aberration of not aiming at fully.Below the embodiment take the RGB color space conversion as the YCbCr color space is further specified content of the present invention, yet can use the structure of the technology of the present invention and the embodiment that method is not limited to carry, the structure of other any applicable the technology of the present invention and method all can be incorporated reference at this.
See also Fig. 5, it is the architecture block diagram of the contact type image scanning means of announcement preferred embodiment of the present invention.As shown in Figure 5, contact type image scanning means 4 comprises light source cell 41 at least, has the first light source 411, secondary light source 412 and the 3rd light source 413 of different colored light sources, in order to shine an object surface 40; Control unit 42 is connected to light source cell 41, in order to control the first light source 411, secondary light source 412 and the 3rd light source 413 light time-histories and the order; And photosensitive unit 43, receive light source cell 41 shines object surface 40 back reflections when object surface 40 moves image, and output image information 44.In the present embodiment, the first light source 411 is red-light LED, and secondary light source 412 is blue-ray LED, and the 3rd light source 413 then is green light LED, thus control unit 42 can control red-light LED, blue-ray LED and green light LED light time-histories and the order.
Carrying out coloured image when scanning at image-scanning device, because the three primary colors light source can be because of the different differences that luminosity is arranged of technique difference and intrinsic propesties, therefore need to adjust by optimization ground time-histories and the order of three primary colors light source igniting, make the luminous energy optimization of three primary colors light source and consistent, to improve precision and the quality of scan image.Therefore for knowing optimized data value range, first the time-histories of lighting of each light source is carried out the optimization adjustment, in the present embodiment, the first light source 411 (red-light LED), secondary light source 412 (blue-ray LED) and the 3rd light source 413 (green light LED) after optimization all respectively given the first light source igniting time-histories Tr, secondary light source light time-histories Tb and the 3rd light source igniting time-histories Tg, and the time span of each light source igniting time-histories all is shorter than the cycle of sweep-initiating pulse relatively.
Fig. 6 A is for showing sweep-initiating pulse and the three primary colors light source igniting time-histories graph of a relation of the present invention's one better scan control method.As shown in the figure, a plurality of sweep-initiating pulses that the first light source 411 (red-light LED) and secondary light source 412 (blue-ray LED) provide according to control unit 42 are respectively lighted time-histories Tb with the first light source igniting time-histories Tr and secondary light source to sequence and are lighted.In the present embodiment, the first light source 411 (red-light LED) is lighted with the first light source igniting time-histories Tr first, afterwards, when the starting time of a sweep-initiating pulse that continues, the first light source 411 (red-light LED) is closed, and also namely the concluding time of the first light source igniting time-histories Tr is identical in fact with the starting time of this sweep-initiating pulse that continues.After the first light source 411 (red-light LED) is closed, light time-histories Tb with secondary light source immediately and start synchronously or light secondary light source (blue-ray LED).Certainly, in certain embodiments, shown in Fig. 6 B, also can after the first light source 411 (red-light LED) is closed, postpone T between a given period
1Light time-histories Tb startup or light secondary light source (blue-ray LED) with secondary light source afterwards.
Then, the first light source 411 (red-light LED), secondary light source 412 (blue-ray LED) and the 3rd light source 413 (green light LED) start simultaneously according to another sweep-initiating pulse that continues, wherein the first light source 411 (red-light LED) continues to light the inferior time-histories Ty that lights of the first light source, close behind the r, secondary light source 412 (blue-ray LED) continues to light secondary light source and time lights time-histories Ty, close behind the b, the 3rd light source 413 (green light LED) then continues to light the 3rd light source and lights time-histories Ty, closes behind the g.Because the present embodiment can be the application of YCbCr color space for the RGB color space conversion, therefore aforesaid the first light source is lighted time-histories Ty, r=0.299 * Tr, secondary light source is lighted time-histories Ty, b=0.114 * Tb, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg.And in contact type image scanning means 4 relative object surface 40 motion scans, photosensitive unit 43 is on the each point correspondence position, receive the first image data value when continuing to light the first light source igniting time-histories Tr respectively at the first light source 411 (red-light LED), be recorded as the R value; When secondary light source 412 (blue-ray LED) continues to light secondary light source point time-histories Tb, receive the second image data value, be recorded as the B value; And receive the 3rd image data value in starting simultaneously three-color light source when closing, be recorded as Y value.And the image data value of each point correspondence position gained by formula Cb=0.56433 * (B-Y) and Cr=0.71327 * (R-Y) calculate, gets final product to get the image information 44 of YCbCr color space information.
In further embodiments, shown in Fig. 6 C, the first light source 411 can be blue-ray LED, secondary light source 412 for red-light LED, the 3rd light source 413 are green light LED, also is that the order that red-light LED and blue-ray LED are lighted can be exchanged.Therefore, when the first light source igniting time-histories is Tb, it is Tr that secondary light source is lighted time-histories, and given the 3rd light source igniting time-histories is when being Tg, and the first light source is lighted time-histories Ty, b=0.114 * Tb, secondary light source is lighted time-histories Ty, r=0.299 * Tr, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg.In addition, be B according to the first obtained image data value of same way as, the second image data value is R, the 3rd image data value is Y, the then Cb=0.56433 of YCbCr color space information * (B-Y), and Cr=0.71327 * (R-Y).
According to conception of the present invention, the present invention provides the scan control method of contact type image scanning means simultaneously.Fig. 7 namely discloses the scan control flow chart that preferred embodiment of the present invention is applied to the contact type image scanning means.As shown in the figure, at first provide the first light source 411, secondary light source 412 and the 3rd light source 413 of different colours, in order to the go forward side by side line scanning irradiation of relative object surface traveling priority, shown in step S61.In certain embodiments, the first light source 411 can be red-light LED, secondary light source 412 can be blue-ray LED, and the 3rd light source 413 then is green light LED.Then, before to object surface 40 scanning first respectively according to cycle of sweep-initiating pulse, optimization the first light source 411, secondary light source 412 and the 3rd light source 413, and given the first light source igniting time-histories Tr, secondary light source light the time length of time-histories Tb and the 3rd light source igniting time-histories Tg, shown in step S62, with reflecting the image data value of generation all in an optimization scope so that the first light source 411, secondary light source 412 and the 3rd light source 413 shine object surfaces 40.
Then, when contact type image scanning means 4 relative object surfaces 40 continue motion scan, according to the one scan starting impulse, light the first light source 411, with between the first light source igniting time-histories Tr, irradiation object surface 40 and reflection produce the first view data, are recorded as the R value, shown in step S63.And when the first light source igniting time-histories Tr finishes, light synchronously or postpone that T1 lights secondary light source 412 between a given period, to light in secondary light source between time-histories Tb, irradiation object surface 40 and reflection produce the second view data, are recorded as the B value, shown in step S64.Subsequently, according to another sweep-initiating pulse, start simultaneously the first light source 411, secondary light source 412 and the 3rd light source 413, to light time-histories Ty respectively at the first light source, r, secondary light source are lighted time-histories Ty, b, reach the 3rd light source and light time-histories Ty, between g, irradiation object surface 40 and reflection generation the 3rd view data, be recorded as Y value, shown in step S65.Be the application of YCbCr color space for the RGB color space conversion, aforesaid the first light source is lighted time-histories Ty, r=0.299 * Tr, and secondary light source is lighted time-histories Ty, b=0.114 * Tb, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg.And when contact type image scanning means 4 relative object surfaces 40 continued motion scan, repeating step S63 to S65 was until photosensitive unit 43 is finished R, B and the Y value on all correspondence positions on reception and the record object surface 40, shown in step S66.Because the image data value of each point correspondence position gained, by formula Cb=0.56433 * (B-Y) and Cr=0.71327 * (R-Y) calculate, can know the image information 44 of YCbCr color space information complete on the object surface 40.
In previous embodiment of the present invention, the lighting time-histories and can exchange of red-light LED and blue-ray LED, do not affect the YCbCr color space information result of final output, but continue at the shorter sortord of lighting time-histories with the relatively long time-histories of lighting, can obtain shorter unit length sweep time.In other words, if the given time-histories of lighting of blue-ray LED light the time greater than the given of red-light LED, then with red-light LED as the first light source, blue-ray LED can be known better result as secondary light source.Briefly, known technology when carrying out a unit scanning motion, finish red bluish-green light time-histories just must cost about time of three sweep-initiating pulses.And the present invention is by specific light source igniting scheduling, shortened during three primary colors light source igniting in the unit scanning motion total, also be to light time-histories Ty by time started to the 3rd last light source of the first light source igniting time-histories Tr among Fig. 6 A-Fig. 6 C, the total time length of the concluding time of g, more any known technology all comes shortly, therefore can effectively improve the aberration problem of not aiming at fully because of image scanning color that the time difference produces.
In addition, in some alternate embodiment, except lighting time-histories can exchange of red-light LED and blue-ray LED, the step that obtains Y value also can be early than the step that obtains R value and B value.In other words, can obtain first Y value, obtain again the R value, obtain at last the B value.Perhaps, obtain first Y value, obtain again the B value, obtain again at last the R value.In this embodiment, can start first the first light source 411, secondary light source 412 and the 3rd light source 413, also namely light time-histories Ty prior to the first light source, r, secondary light source are lighted time-histories Ty, b reaches the 3rd light source and lights time-histories Ty, and g shines object surface 40, and reflection generation the 3rd view data, be recorded as Y value.Afterwards, the mode according to previous embodiment obtains the first view data R value and the second view data B value etc. again, does not so affect the YCbCr color space information result of final output.
In sum, the invention provides a kind of contact type image scanning means and scan control method thereof, light sequential and time-histories by three primary colors light sources such as control ruddiness, green glow and blue-ray LED etc., the error that on scanning position, produces to reduce the RGB three primary colors, and then improvement the aberration phenomenon of not aiming at fully because scan image produces color; Simultaneously also can provide the Output rusults that is different from RGB three color spaces according to user demand, such as YCbCr or the output of CMYB color space, this can't reach for known technology.
Can be appointed by those of ordinary skills even if the present invention has been described in detail by the above embodiments and to execute that the craftsman thinks and be to modify as all, not take off the scope such as the wish protection of attached claim institute.
Claims (13)
1. contact type image scanning means comprises at least:
One light source cell has the first light source, secondary light source and the 3rd light source of different colours, in order to shine an object surface;
One control unit is connected to this light source cell, in order to control the time-histories of lighting of this first light source, this secondary light source and the 3rd light source; Wherein this first light source and this secondary light source are according to the one scan starting impulse, start respectively one first light source igniting time-histories and a secondary light source and light time-histories, and this secondary light source lights that time-histories starts synchronously when this first light source igniting time-histories finishes or retardation one given period between start; This first light source, this secondary light source and the 3rd light source start simultaneously one first light source and light time-histories, inferior time-histories and the inferior time-histories of lighting of one the 3rd light source lighted of a secondary light source according to another sweep-initiating pulse; And
One photosensitive unit, receive this light source cell shines this object surface back reflection when this object surface moves image, and export an image information, wherein this first light source igniting time-histories receives one first image data value, this secondary light source is lighted time-histories and is received one second image data value, and lights time-histories, a secondary light source and light and receive one the 3rd image data value when time-histories and one the 3rd light source are lighted time-histories in starting simultaneously one first light source.
2. contact type image scanning means as claimed in claim 1, wherein this image information is the YCbCr color space information.
3. contact type image scanning means as claimed in claim 2, wherein this first light source is that red-light LED, this secondary light source are that blue-ray LED, the 3rd light source are green light LED.
4. contact type image scanning means as claimed in claim 3, wherein working as this first light source igniting time-histories is Tr, it is Tb that this secondary light source is lighted time-histories, and given the 3rd light source igniting time-histories is when being Tg, and this first light source is lighted time-histories Ty, r=0.299 * Tr, this secondary light source is lighted time-histories Ty, b=0.114 * Tb, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg; And wherein this first image data value is R, and this second image data value is B, and the 3rd image data value is Y, the Cb=0.56433 of this YCbCr color space information * (B-Y) then, and Cr=0.71327 * (R-Y).
5. contact type image scanning means as claimed in claim 4, the order that wherein obtains this first image data value, this second image data value and the 3rd image data value is sequentially R, B, Y or Y, R, B.
6. contact type image scanning means as claimed in claim 2, wherein this first light source is that blue-ray LED, this secondary light source are that red-light LED, the 3rd light source are green light LED.
7. contact type image scanning means as claimed in claim 6, wherein working as this first light source igniting time-histories is Tb, it is Tr that this secondary light source is lighted time-histories, and given the 3rd light source igniting time-histories is when being Tg, and this first light source is lighted time-histories Ty, b=0.114 * Tb, this secondary light source is lighted time-histories Ty, r=0.299 * Tr, the 3rd light source is lighted time-histories Ty, g=0.587 * Tg; And wherein this first image data value is B, and this second image data value is R, and the 3rd image data value is Y, the Cb=0.56433 of this YCbCr color space information * (B-Y) then, and Cr=0.71327 * (R-Y).
8. contact type image scanning means as claimed in claim 7, the order that wherein obtains this first image data value, this second image data value and the 3rd image data value is sequentially B, R, Y or Y, B, R.
9. the scan control method of a contact type image scanning means comprises step at least:
(a) provide one first light source, a secondary light source and one the 3rd light source of different colours, in order to move the line scanning irradiation of going forward side by side relative to an object surface;
(b) according to the one scan starting impulse, light this first light source, with between one first light source igniting time-histories, shine this object surface and reflection generation one first view data;
(c) when this first light source igniting time-histories finishes, light synchronously or retardation one given period between after light this secondary light source, to light between time-histories in a secondary light source, shine this object surface and reflection produces one second view data; And
(d) according to another sweep-initiating pulse, light simultaneously this first light source, this secondary light source and the 3rd light source, with time light time-histories respectively at one first light source, a secondary light source lights time-histories and one the 3rd light source is lighted between time-histories, shines this object surface and reflection produces one the 3rd view data.
10. scan control method as claimed in claim 9, wherein this first light source igniting time-histories, this secondary light source light time-histories and the 3rd light source igniting time-histories time length all less than cycle of the described sweep-initiating pulse of step (b).
11. scan control method as claimed in claim 9, wherein this contact type image scanning means comprises a photosensitive unit, it receives a light source cell shines this object surface back reflection when this object surface moves image, and export an image information, and this image information is the YCbCr color space information.
12. scan control method as claimed in claim 11, wherein this first light source is that red-light LED, this secondary light source are that blue-ray LED, the 3rd light source are green light LED; Wherein working as this first light source igniting time-histories is Tr, it is Tb that this secondary light source is lighted time-histories, and given the 3rd light source igniting time-histories is when being Tg, this first light source is lighted time-histories Ty, r=0.299 * Tr, this secondary light source is lighted time-histories Ty, b=0.114 * Tb, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg; And wherein this first image data value is R, and this second image data value is B, and the 3rd image data value is Y, the Cb=0.56433 of this YCbCr color space information * (B-Y) then, and Cr=0.71327 * (R-Y).
13. scan control method as claimed in claim 11, wherein this first light source is that blue-ray LED, this secondary light source are that red-light LED, the 3rd light source are green light LED; Wherein working as this first light source igniting time-histories is Tb, it is Tr that this secondary light source is lighted time-histories, and given the 3rd light source igniting time-histories is when being Tg, this first light source is lighted time-histories Ty, b=0.114 * Tb, this secondary light source is lighted time-histories Ty, r=0.299 * Tr, and the 3rd light source is lighted time-histories Ty, g=0.587 * Tg; And wherein this first image data value is B, and this second image data value is R, and the 3rd image data value is Y, the Cb=0.56433 of this YCbCr color space information * (B-Y) then, and Cr=0.71327 * (R-Y).
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| CN1933531A (en) * | 2005-09-16 | 2007-03-21 | 致伸科技股份有限公司 | Image scanner and image data compensating method |
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| CN1933531A (en) * | 2005-09-16 | 2007-03-21 | 致伸科技股份有限公司 | Image scanner and image data compensating method |
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