CN101478627B - Video capture apparatus and method - Google Patents
Video capture apparatus and method Download PDFInfo
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- CN101478627B CN101478627B CN2008100322724A CN200810032272A CN101478627B CN 101478627 B CN101478627 B CN 101478627B CN 2008100322724 A CN2008100322724 A CN 2008100322724A CN 200810032272 A CN200810032272 A CN 200810032272A CN 101478627 B CN101478627 B CN 101478627B
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Abstract
The present invention discloses an image picking-up device and a method thereof. The image picking-up device comprises the following components: an image sensor which is used for outputting a plurality of first analog image signals which are corresponding with a plurality of pixels; an analog/digital converter which is used for converting the plurality of analog image signals to a plurality of digital image signals; a digital/analog converter which is used for converting the plurality of digital image signals to a plurality of analog image signals that respectively have actual voltage magnitudes; a comparing unit which is used for respectively comparing the actual voltage magnitude of the second analog image signal to reference voltage magnitude for generating a plurality of corresponding comparing results; a counting unit which is used for adjusting the count value according to each comparing result in the comparing results; and a control unit which is used for determining whether the scanning operation is stopped according to the count value.
Description
Technical field
The invention relates to a kind of image capture unit and image acquisition method, refer to a kind of image capture unit and image acquisition method that does not need to use any inductor and can in scanning process, judge the size of scanning target especially.
Background technology
Generally speaking, at traditional image capture unit (for example in the falt bed scanner (flatbed scanner), for the size of detecting sweep object (for example file or picture) mainly contains two kinds with the known image acquisition method that determines scanning area, wherein first kind of known image acquisition method is that a plurality of inductors are installed in this image capture unit, infrared inductor (infrared sensor for example, IR sensor), but when sweep object has multiple different size, the inductor quantity of required installation will and then increase, and this also just means and uses this known image acquisition method need spend very high cost with relevant image capture unit.
Second kind of known image acquisition method then is after elder generation is scanned whole scanning window (scan window) zone of this image capture unit, utilize algorithmic approach to obtain the image of sweep object again, in other words, when follow-up use software upload scan-data, the scan-data that this known image acquisition method must be uploaded the image that comprises whole scanning window zone just can obtain the image of sweep object.Thus, required data quantity transmitted will maintain a very big quantity always, so central processing unit (CPU) that uses this known image acquisition method and relevant image capture unit to arrange in pairs or groups to have higher disposal ability and direct memory access (direct memory access faster, DMA) controller (clearly, use this known image acquisition method equally also to need to spend very high cost) with relevant image capture unit, otherwise this image capture unit just can't efficiently carry out scan operation, but also may have the situation generation that data are lost.
Summary of the invention
In view of this, one of purpose of the present invention is to provide a kind of image capture unit and image acquisition method that does not need to use any inductor and can judge the size of sweep object in scanning process, to solve the above problems.
Include image sensor, analog/digital converter (analog-to-digital converter according to image capture unit of the present invention, ADC), digital/analog converter (digital-to-analog converter, DAC), comparing unit, counting unit and control unit, wherein, this image sensor is used to export a plurality of first analog image signals of corresponding a plurality of pixels; It is a plurality of digital image signals that this analog/digital converter is used for these first analog image conversion of signals; This digital/analog converter is coupled to this analog/digital converter, and is used for these digital image signals are converted to a plurality of second analog image signals that have actual voltage value respectively; This comparing unit is coupled to this digital/analog converter, and is used for respectively relatively that the actual voltage value and the reference voltage level of these second analog image signals produce corresponding a plurality of comparative result; This counting unit is coupled to this comparing unit, and is used for adjusting count value according to each comparative result of these comparative results; And this control unit is coupled to this counting unit, and is used for determining whether stopping scan operation according to this count value, and wherein, when count value did not reach special value, then control unit continued scan operation according to the count value decision; And when count value reached special value, then control unit stopped scan operation according to the count value decision.
Include according to image acquisition method of the present invention: set reference voltage level; Export a plurality of first analog image signals of corresponding a plurality of pixels; With these first analog image conversion of signals is a plurality of digital image signals; These digital image signals are converted to a plurality of second analog image signals that have actual voltage value respectively; Relatively actual voltage value and this reference voltage level of these second analog image signals produce corresponding a plurality of comparative result respectively; Adjust count value according to each comparative result in these comparative results; And determine whether stopping scan operation according to this count value, wherein, determine whether that according to count value the step that stops scan operation including: when count value did not reach special value, then control unit continued scan operation according to the count value decision; And when count value reached special value, then control unit stopped scan operation according to the count value decision.
Description of drawings
What Fig. 1 was shown is the schematic diagram of the image capture unit of embodiments of the invention.
Fig. 2 is a flow chart of summarizing the image acquisition method of the first embodiment of the present invention according to the function mode of the image capture unit among Fig. 1.
Fig. 3 is a flow chart of summarizing the image acquisition method of the second embodiment of the present invention according to the function mode of the image capture unit among Fig. 1.
The main element symbol description
105: image sensor
100: image capture unit
110: analog/digital converter
120: digital/analog converter
130: comparing unit
140: counting unit
150: control unit
Embodiment
In the middle of this specification and claims, used some vocabulary to censure specific element, and those skilled in the art should be appreciated that, hardware manufacturer may be called same element with different nouns, the this specification and claims book is not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function, be open term mentioned " including " in specification and follow-up claims in the whole text, so should be construed to " include but be not limited to ", in addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this, therefore, be coupled to second device if describe first device in the literary composition, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device indirectly through other device or connection means.
Please refer to Fig. 1, what Fig. 1 was shown is the schematic diagram of the image capture unit 100 of embodiments of the invention.As shown in Figure 1, image capture unit 100 includes image sensor 105, analog/digital converter (analog-to-digital converter, ADC) 110, digital/analog converter (digital-to-analog converter, DAC) 120, comparing unit 130, counting unit 140 and control unit 150, wherein, analog/digital converter 110 is coupled to image sensor 105, digital/analog converter 120 is coupled to analog/digital converter 110, comparing unit 130 is coupled to digital/analog converter 120, counting unit 140 is coupled to comparing unit 130, and control unit 150 is coupled to counting unit 140, in addition, analog/digital converter 120 can be used analog front end processor, and (analog front end AFE) realizes.At first, image acquisition method of the present invention is set reference voltage level Vr earlier as the critical value (threshold value) that is used for judging background video in the image capture unit 100 (background image), wherein, can decide the optimum setting value of reference voltage level Vr when setting reference voltage level Vr according to different scanning demands, for instance, when this background video is all black, reference voltage level Vr can be set at the relative voltage that equals or be higher than this background video a little, and when this background video was whole white, reference voltage level Vr can be set at and equal or a shade below the relative voltage of this background video.Then, scan target (for example file) when carrying out scan operation 100 pairs of image capture units, can utilize image sensor 105 to export a plurality of first analog image signals corresponding to a plurality of pixels, then, utilizing analog/digital converter 110 is a plurality of digital image signals with these first analog image conversion of signals, and then utilize digital/analog converter 120 these digital image signals to be converted to a plurality of second analog image signals that have actual voltage value respectively, then, utilize comparing unit 130 respectively relatively the actual voltage value of these second analog image signals and reference voltage level Vr to produce corresponding a plurality of comparative result, and then utilize counting unit 140 to adjust count value according to each comparative result in these comparative results, at last utilize control unit 150 to determine whether stopping this scan operation of image capture unit 100 according to this count value again, please note at this, above-described embodiment is not a restrictive condition of the present invention only for illustrating.
In the image acquisition method of the first embodiment of the present invention, suppose that this background video is a whole white, and reference voltage level Vr is set at equals or a shade below the relative voltage of this background video, therefore, when one of them is greater than or equal to reference voltage level Vr when these actual voltage values, then counting unit 140 reduces or increases this count value according to this comparative result, and when these actual voltage values when one of them is lower than reference voltage level Vr, then counting unit 140 can determine not adjust this count value according to this comparative result, wherein, these pixels can be the pixels that scan line had of specific quantity, if and scanning this specific quantity scan line after, when this count value corresponding to these comparative results does not reach special value, then control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value, and the count value of (reset) counting unit 140 of resetting; And when this count value reached this special value, then control unit can decide the scan operation that stops image capture unit 100 according to this count value, and the count value of replacement counting unit 140.In addition, if when counting unit 140 decides this count value of adjustment according to this comparative result this count value is increased progressively gradually from initial value, the difference of this initial value and this special value is exactly the pixel total amount corresponding to these pixels so.For instance, suppose these pixels to be set at 3 pixels that scan line had and the initial value of this count value is set at 0 at this, and every scan line has 300 pixels respectively, if and when these actual voltage values when one of them is greater than or equal to reference voltage level Vr, counting unit 140 can decide according to this comparative result and adjust this count value increase by 1, then above-mentioned special value is 900, so when counting unit 140 with this count value when 0 is incremented to 900 gradually, just represent that these actual voltage values all are greater than or equal to reference voltage level Vr, just image capture unit 100 has scanned this background video, so control unit 150 can decide the scan operation that stops image capture unit 100 according to this count value, and with the count value of counting unit 140 reset (reset) be 0; Otherwise, when this image capture unit 100 has scanned 3 scan lines, and this count value does not reach at 900 o'clock, then represent to have at least in these actual voltage values an actual voltage value to be lower than reference voltage level Vr, just image capture unit 100 is also at this scanning target image of scanning, and do not scan this background video as yet, so control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value, and the count value of counting unit 140 reset to 0.On the other hand, also counting unit 140 can be set in the present invention according to this comparative result decides this count value of adjustment to reduce 1, so when counting unit 140 with this count value when 900 are decremented to 0 gradually, represent that then these actual voltage values all are greater than or equal to reference voltage level Vr, just image capture unit 100 has scanned this background video, so control unit 150 can decide the scan operation that stops image capture unit 100 according to this count value; Otherwise, when this count value does not reach 0, then represent to have at least in these actual voltage values an actual voltage value to be lower than reference voltage level Vr, just image capture unit 100 is also at this scanning target image of scanning, and do not scan this background video as yet, so control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value, please note at this, above-described embodiment is not a restrictive condition of the present invention only for illustrating.
Please refer to Fig. 2, Fig. 2 is a flow chart of summarizing the image acquisition method of the first embodiment of the present invention according to the function mode of above-mentioned image capture unit 100.Step in the flow process not necessarily needs to carry out according to order shown in Figure 2, and it is continuous also not necessarily needing, and that is to say, the step of inserting other between these steps also can obtain identical result substantially.First embodiment of the inventive method includes the following step:
Step 200: utilize control unit 150 to control image capture unit 100 with the beginning scan operation.
Step 210: set reference voltage level Vr as the critical value that is used for judging the background video in the image capture unit 100.
Step 220: utilize image sensor 105 to export a plurality of first analog image signals corresponding to a plurality of pixels, wherein these pixels are specific quantity (for example 3 s') the pixel that scan line had (for example 900 pixels).
Step 230: utilizing analog/digital converter 110 is a plurality of digital image signals with these first analog image conversion of signals.
Step 240: utilize digital/analog converter 120 these digital image signals to be converted to a plurality of second analog image signals that have actual voltage value respectively.
Step 250: utilize comparing unit 130 respectively relatively the actual voltage value of these second analog image signals and reference voltage level Vr to produce corresponding a plurality of comparative result, wherein, when one of them is greater than or equal to reference voltage level Vr when these actual voltage values, then then carry out step 260; And when one of them is lower than reference voltage level Vr, then then carry out step 270 when these actual voltage values.
Step 260: utilize counting unit 140 to adjust count value, then carry out step 280 according to this comparative result; Wherein, this counting unit decides when adjusting this count value according to this comparative result this count value is increased progressively (or successively decreasing) gradually from initial value (for example 0).
Step 270: utilize counting unit 140 not adjust this count value, then carry out step 280 according to this comparative result.
Step 280: when this count value corresponding to these comparative results does not reach special value (for example 900), then carry out step 220; When this count value reaches this special value (for example 900), then carry out step 290; Wherein, the difference of this initial value (for example 0) and this special value (for example 900) is corresponding to the pixel total amount of these pixels (for example 900).
Step 290: utilize control unit 150 to stop this scan operation of image capture unit 100.
On the other hand, similar with the image acquisition method of the first embodiment of the present invention, in the image acquisition method of the second embodiment of the present invention, be to utilize the image capture unit 100 among Fig. 1 to carry out scan operation equally, so the detailed content about image capture unit 100 is not just given unnecessary details at this, in addition, the image acquisition method of the second embodiment of the present invention is utilizing comparing unit 130 respectively these actual voltage values to be compared with reference voltage level Vr that all the image acquisition method with the first embodiment of the present invention is identical with the method flow before producing corresponding this step of a plurality of comparative result, yet, this background video of hypothesis is an all black in the image acquisition method of the second embodiment of the present invention, and reference voltage level Vr is set at the relative voltage that equals or be higher than this background video a little, therefore, when one of them is less than or equal to reference voltage level Vr when these actual voltage values, then counting unit 140 reduces or increases this count value according to this comparative result, and when these actual voltage values when one of them is higher than reference voltage level Vr, then counting unit 140 can determine not adjust this count value according to this comparative result, wherein, these pixels also can be the pixels that scan line had of specific quantity, if and scanning this specific quantity scan line after, when this count value corresponding to these comparative results does not reach special value, then control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value, and the count value of (reset) counting unit 140 of resetting; And when this count value reached this special value, then control unit can decide the scan operation that stops image capture unit 100 according to this count value, and the count value of replacement counting unit 140.In addition, if when counting unit 140 decides this count value of adjustment according to this comparative result this count value is increased progressively gradually from initial value, the difference of this initial value and this special value is exactly the pixel total amount corresponding to these pixels so.For instance, suppose these pixels to be set at 3 pixels that scan line had and the initial value of this count value is set at 0 at this, and every scan line has 300 pixels respectively, if and when these actual voltage values when one of them is less than or equal to reference voltage level Vr, counting unit 140 can decide according to this comparative result and adjust this count value increase by 1, then above-mentioned special value is 900, so when counting unit 140 with this count value when 0 is incremented to 900 gradually, just represent that these actual voltage values all are less than or equal to reference voltage level Vr, just image capture unit 100 has scanned this background video, so control unit 150 can decide the scan operation that stops image capture unit 100 according to this count value, and with the count value of counting unit 140 reset (reset) be 0; Otherwise, when this count value does not reach 900, then represent to have at least in these actual voltage values an actual voltage value to be higher than reference voltage level Vr, just image capture unit 100 is also at this scanning target image of scanning, and do not scan this background video as yet, so control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value, and the count value of counting unit 140 is reset to 0.On the other hand, also counting unit 140 can be set in the present invention according to this comparative result decides this count value of adjustment to reduce 1, so when counting unit 140 with this count value when 900 are decremented to 0 gradually, represent that then these actual voltage values all are less than or equal to reference voltage level Vr, just image capture unit 100 has scanned this background video, so control unit 150 can decide the scan operation that stops image capture unit 100 according to this count value; Otherwise, when this count value does not reach 0, then represent to have at least in these actual voltage values an actual voltage value to be higher than reference voltage level Vr, just image capture unit 100 is also at this scanning target image of scanning, and do not scan this background video as yet, so control unit 150 can decide the scan operation that continues image capture unit 100 according to this count value.
Please refer to Fig. 3, Fig. 3 is a flow chart of summarizing the image acquisition method of the second embodiment of the present invention according to the function mode of above-mentioned image capture unit 100.Step in the flow process not necessarily needs to carry out according to order shown in Figure 3, and it is continuous also not necessarily needing, and that is to say, the step of inserting other between these steps also can obtain identical result substantially.First embodiment of the inventive method includes the following step:
Step 300: utilize control unit 150 to control image capture unit 100 with the beginning scan operation.
Step 310: set reference voltage level Vr as the critical value that is used for judging the background video in the image capture unit 100.
Step 320: utilize image sensor 105 to export a plurality of first analog image signals corresponding to a plurality of pixels, wherein these pixels are specific quantity (for example 3 s') the pixel that scan line had (for example 900 pixels).
Step 330: utilizing analog/digital converter 110 is a plurality of digital image signals with these first analog image conversion of signals.
Step 340: utilize digital/analog converter 120 these digital image signals to be converted to a plurality of second analog image signals that have actual voltage value respectively.
Step 350: utilize comparing unit 130 respectively relatively the actual voltage value of these second analog image signals and reference voltage level Vr to produce corresponding a plurality of comparative result, wherein, when one of them is less than or equal to reference voltage level Vr when these actual voltage values, then then carry out step 360; And when one of them is higher than reference voltage level Vr, then then carry out step 370 when these actual voltage values.
Step 360: utilize counting unit 140 to adjust count value, then carry out step 380 according to this comparative result; Wherein, this counting unit decides when adjusting this count value according to this comparative result this count value is increased progressively (or successively decreasing) gradually from initial value (for example 0).
Step 370: utilize counting unit 140 not adjust this count value, then carry out step 380 according to this comparative result.
Step 380: when this count value corresponding to these comparative results does not reach special value (for example 900), then carry out step 320; When this count value reaches this special value (for example 900), then carry out step 390; Wherein, the difference of this initial value (for example 0) and this special value (for example 900) is corresponding to the pixel total amount of these pixels (for example 900).
Step 390: utilize control unit 150 to stop this scan operation of image capture unit 100.
In sum, image capture unit that the present invention is disclosed and image acquisition method do not need to use any inductor and can judge the size of scanning target in scanning processes, and can not be subjected to the restriction of inductor quantity and other factors, and need spend very high cost with relevant image capture unit unlike known image acquisition method, central processing unit (CPU) that also not needing arranges in pairs or groups has higher disposal ability and direct memory access (direct memory access faster, DMA) controller, just can efficiently carry out scan operation, nor have the situation generation that data are lost.
The above only is preferred embodiment of the present invention, and all equivalent variations and improvement of doing according to claims of the present invention all should belong to covering scope of the present invention.
Claims (13)
1. an image capture unit is characterized in that, includes:
Image sensor is used to export a plurality of first analog image signals of corresponding a plurality of pixels;
Analog/digital converter, being used for described a plurality of first analog image conversion of signals is a plurality of digital image signals;
Digital/analog converter is coupled to described analog/digital converter, is used for described a plurality of digital image signals are converted to a plurality of second analog image signals that have actual voltage value respectively;
Comparing unit is coupled to described digital/analog converter, and the actual voltage value and the reference voltage level that are used for more described respectively a plurality of second analog image signals produce corresponding a plurality of comparative result;
Counting unit is coupled to described comparing unit, is used for adjusting count value according to each comparative result of described a plurality of comparative results; And
Control unit is coupled to described counting unit, is used for determining whether stopping scan operation according to described count value,
Wherein, when described count value did not reach special value, then control unit continued described scan operation according to described count value decision; And when described count value reached described special value, then control unit stopped described scan operation according to described count value decision.
2. image capture unit as claimed in claim 1, it is characterized in that, background video in described image capture unit is a whole white, and reference voltage level is set at equals or a shade below the relative voltage of described background video, when one of them was greater than or equal to described reference voltage level when described a plurality of actual voltage values, then described counting unit reduced or increases described count value according to described comparative result.
3. image capture unit as claimed in claim 1, it is characterized in that, background video in described image capture unit is an all black, and reference voltage level is set at the relative voltage that equals or be higher than described background video a little, when one of them was less than or equal to described reference voltage level when described a plurality of actual voltage values, then described counting unit reduced or increases described count value according to described comparative result.
4. image capture unit as claimed in claim 1, it is characterized in that, described a plurality of pixel is the pixel that scan line had of specific quantity, when described counting unit is adjusted described count value according to described comparative result, described count value is increased progressively gradually from initial value, and the difference of described initial value and described special value is corresponding to the pixel total amount of described a plurality of pixels.
5. image capture unit as claimed in claim 1, it is characterized in that, described a plurality of pixel is the pixel that scan line had of specific quantity, when described counting unit is adjusted described count value according to described comparative result, described count value is successively decreased gradually from initial value, and the difference of described initial value and described special value is corresponding to the pixel total amount of described a plurality of pixels.
6. image capture unit as claimed in claim 1, it is characterized in that, also comprise background video, wherein said reference voltage level is corresponding to first gray value of described background video, and described a plurality of actual voltage value corresponds respectively to a plurality of second gray values of target image.
7. image capture unit as claimed in claim 1 is characterized in that, described analog/digital converter is the AFE (analog front end) element.
8. an image acquisition method is characterized in that, includes:
Set reference voltage level;
Export a plurality of first analog image signals of corresponding a plurality of pixels;
With described a plurality of first analog image conversion of signals is a plurality of digital image signals;
Described a plurality of digital image signals are converted to a plurality of second analog image signals that have actual voltage value respectively;
The actual voltage value of more described respectively a plurality of second analog image signals and described reference voltage level produce corresponding a plurality of comparative result;
Adjust count value according to each comparative result in described a plurality of comparative results; And
Determine whether stopping scan operation according to described count value,
Wherein, determine whether that according to described count value the step that stops scan operation including:
When described count value did not reach special value, then control unit continued described scan operation according to described count value decision; And when described count value reached described special value, then control unit stopped described scan operation according to described count value decision.
9. image acquisition method as claimed in claim 8, it is characterized in that the step that the actual voltage value of more described respectively a plurality of second analog image signals and reference voltage level produce each comparative result adjustment count value in corresponding a plurality of comparative result and the described a plurality of comparative results of foundation includes in addition:
Background video in the image capture unit of implementing described image acquisition method is a whole white, and reference voltage level is set at equals or a shade below the relative voltage of described background video, when one of them is greater than or equal to described reference voltage level when described a plurality of actual voltage values, then reduce or increase described count value according to described comparative result.
10. image acquisition method as claimed in claim 8, it is characterized in that the step that the actual voltage value of more described respectively a plurality of second analog image signals and reference voltage level produce each comparative result adjustment count value in corresponding a plurality of comparative result and the described a plurality of comparative results of foundation includes in addition:
Background video in the image capture unit of implementing described image acquisition method is an all black, and reference voltage level is set at the relative voltage that equals or be higher than described background video a little, when one of them is less than or equal to described reference voltage level when described a plurality of actual voltage values, then reduce or increase described count value according to described comparative result.
11. image acquisition method as claimed in claim 8 is characterized in that, described a plurality of pixels are the pixel that scan line had of specific quantity, and the step of adjusting described count value includes in addition:
Described count value is increased progressively gradually from initial value;
The difference of wherein said initial value and described special value is corresponding to the pixel total amount of described a plurality of pixels.
12. image acquisition method as claimed in claim 8 is characterized in that, described a plurality of pixels are the pixel that scan line had of specific quantity, and the step of adjusting described count value includes in addition:
Described count value is successively decreased gradually from initial value;
The difference of wherein said initial value and described special value is corresponding to the pixel total amount of described a plurality of pixels.
13. image acquisition method as claimed in claim 8 is characterized in that, described reference voltage level is corresponding to first gray value of background video, and described a plurality of actual voltage value corresponds respectively to a plurality of second gray values of target image.
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| JP5126346B2 (en) * | 2010-11-24 | 2013-01-23 | カシオ計算機株式会社 | Imaging apparatus, image processing method, and program |
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| CN1219820A (en) * | 1997-12-08 | 1999-06-16 | 鸿友科技股份有限公司 | Test method for scanning boundary and its device |
| US5987163A (en) * | 1996-06-26 | 1999-11-16 | Minolta Co., Ltd. | Apparatus and method for determining the size of a page size in an image reader |
| CN1392511A (en) * | 2001-06-20 | 2003-01-22 | 力捷电脑股份有限公司 | Scanning speed control device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5987163A (en) * | 1996-06-26 | 1999-11-16 | Minolta Co., Ltd. | Apparatus and method for determining the size of a page size in an image reader |
| CN1219820A (en) * | 1997-12-08 | 1999-06-16 | 鸿友科技股份有限公司 | Test method for scanning boundary and its device |
| CN1392511A (en) * | 2001-06-20 | 2003-01-22 | 力捷电脑股份有限公司 | Scanning speed control device and method |
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