CN1235393C - Image picking apparatus and method thereof - Google Patents
Image picking apparatus and method thereof Download PDFInfo
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- CN1235393C CN1235393C CN 02152982 CN02152982A CN1235393C CN 1235393 C CN1235393 C CN 1235393C CN 02152982 CN02152982 CN 02152982 CN 02152982 A CN02152982 A CN 02152982A CN 1235393 C CN1235393 C CN 1235393C
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Abstract
The present invention provides an Image picker used for detecting images and generating pixel data of the images. The present invention comprises a sensor, a light source and a controller, wherein the sensor comprises a plurality of detection units, and the detection units are orderly exposed in respective exposure time and generate the pixel data; the exposure time is overlapped; the light source irradiates the images and cause the images to be detected by the sensor; the controller turns on the light source during the overlapping period of the exposure time of the detection units, and reaches the effects of electricity saving and skewness avoidance of the picked images.
Description
Technical field
The present invention relates to a kind of image pick-up device and method thereof, designs especially a kind of pixel data in the same picture to be obtained at one time, when avoiding picking up dynamic image, produces the crooked phenomenon of picture.
Background technology
Fig. 1 shows the circuit block diagram of image pick-up device, comprising exposure control unit 11, transducer array 12 and light source 13.Also have vertical counter 111 and horizontal counter 112 in the exposure control unit 11.Transducer array 12 is made up of a plurality of detecting unit (not shown)s that are arranged in matrix, and detecting unit constantly receives external light and accumulates corresponding electric charge.Light source 13 is the images that will detect in order to irradiation, makes this image can produce the light of injecting transducer array 12, so that its detecting unit exposure.
The operation of the image pick-up device among Fig. 1 is as follows.Having 16 horizontal lines (being that transducer array 12 has 16 row detecting units) with transducer array 12 be example, and exposure control unit 11 is exported respectively and read signal R0～R15 and reset signal R0_reset～R15_reset and the 0th walk to the 15th capable detecting unit to the transducer array 12.When reset signal R0_reset～R15_reset is in high potential, can discharges in the detecting unit because of exposure and charges accumulated, and detecting unit be exposed again and the electric charge accumulation.When reading signal R0～R15 and be in high potential, detecting unit can be exported the magnitude of voltage that its stored charge generates, as a pixel data value of this detecting unit output.These pixel data values then are combined into a width of cloth and have 16 horizontal pictures.In addition, reset signal R0_reset～R15_reset makes expose again successively line by line operation with output pixel data of detecting unit with reading signal R0～R15, as shown in Figure 2.
Fig. 2 shows the sequential chart of the traditional sensors array scanning of the image pick-up device among Fig. 1.At first, reset signal R0_reset produces a high potential exposes the detecting unit of the row of the 0th in the transducer array 12 again, and after through a time for exposure t1, read signal R0 and produce detecting unit that a high potential makes the row of the 0th in the transducer array 12 magnitude of voltage output that its stored charge produced pixel data as this horizontal line (OK).Then, reset signal R1_reset～R15_reset signal then produces high potential successively with a horizontal sweep interval, and the detecting unit of the 1st～15 row is also exposed successively again, read signal R1～R15 signal after the process time identical with time for exposure t1, follow the counting operation of horizontal counter 112, produce high potential successively with a horizontal sweep interval (being the time in counting interval of horizontal counter 112), and the detecting unit of the 1st～15 row is also exported the magnitude of voltage that its stored charge produced as pixel data successively.
In addition, read the high potential pulse of representing read operation among signal R0～R15 and produce the i.e. frame frequency of image pick-up device for this reason of frequency, its relative image time is T.Traditionally, the generation time of this high potential is controlled by the horizontal counter 112 in the time for exposure controller 11.Horizontal counter 112 has a final count value identical with the horizontal line number (16) of picture, and constantly repeat the operation that counts up to 16 (or 0 to 15) from 1, read signal R0～R15 and then finish the time of a count cycle as the cycle that produces high potential, i.e. image time with horizontal counter.
In above-mentioned traditional scan mode, by the sequential chart of Fig. 2 as can be known, because the count cycle of horizontal counter 112 is identical with the time that is scanned up to the 15th row detecting unit from the 0th row detecting unit, make that the time for exposure t1 of the 0th row must be less than the time (being image time T) from the 0th line scanning to the 15 row detecting units, otherwise will finish a count cycle at an image time because of horizontal counter 112, the detecting unit of the 0th row is not reset when finishing exposing operation as yet.So, the time for exposure t1 and the 15th time for exposure t2 that goes of the 0th row can not be overlapped (because of the 15th time for exposure of going detecting unit postponed an image time than the 0th time for exposure of going detecting unit, and the time for exposure of the 0th row is again less than an image time) under this structure.
Because the 0th row can't overlap with the time for exposure of the 15th row detecting unit, with causing the pixel data in the same picture is to obtain in different time, so the picture that produces will have phenomenon crooked, distortion to take place, when scanning frequency is not high, excuse tail two row pixel datas to obtain the time difference bigger, this phenomenon is especially serious.
Summary of the invention
In order to address the above problem, the invention provides and a kind of pixel data in the same picture is obtained at one time, when avoiding picking up dynamic image, produce the crooked phenomenon of picture.
One object of the present invention is to provide a kind of image pick-up device, in order to detected image and produce a plurality of pixel datas of this image, this image pick-up device comprises: transducer, have a plurality of detecting units, these detecting units expose in a plurality of time for exposure successively and export these pixel datas, and these time for exposure partly overlap; Light source shines this image and makes this image by this sensor; And controller, the time for exposure of these detecting units partly overlap during in open this light source, wherein, these detecting units are formed an array, described controller comprises a horizontal counter, and these detecting units are followed the counting of this horizontal counter and exported these pixel datas line by line successively, and described horizontal counting appliance has a final count value, this final count value is greater than the line number of described array, so that these time for exposure partly overlap.
Another object of the present invention is to provide a kind of image pickup method, in order to utilize the image pick-up device detected image and to produce a plurality of pixel datas of this image, this image pick-up device comprises: light source; A plurality of detecting units of forming array; And the controller that comprises horizontal counter, this image pickup method may further comprise the steps: use these detecting units that this image is detected successively in a plurality of time for exposure, these detecting units are followed the counting of this horizontal counter and are exported these pixel datas line by line successively, and produce these pixel datas, and these time for exposure are partly overlapped; The time for exposure of these detecting units partly overlap during in open this image of this light source irradiation by controller, make this image detected; And make the line number of the final count value of described horizontal counter greater than described array, so that these time for exposure partly overlap.
Thus, the count cycle that the present invention utilizes the operation of " imaginary number " to prolong horizontal counter, make the time for exposure amount can be greater than time difference of two row pixel datas end to end, just can occur, in one section special time, all detecting units in the transducer array all were in the time for exposure, only opened light source in this special time simultaneously, the picture that makes last generation mainly is that the pixel data that is picked up in the special time is thus formed, and can avoid that picture in the tradition is crooked, the phenomenon of distortion.
Description of drawings
Below, with regard to the embodiment of accompanying drawings according to a kind of image pick-up device of the present invention and method thereof.
Fig. 1 shows the circuit block diagram of image pick-up device;
Fig. 2 shows the sequential chart of traditional transducer array scanning of the image pick-up device among Fig. 1;
Fig. 3 shows the sequential chart of the transducer array scanning of image pick-up device according to an embodiment of the invention;
Fig. 4 shows the light source among this embodiment of the present invention;
Fig. 5 shows another light source among this embodiment of the present invention;
Fig. 6 shows the flow chart of the captured image method among this embodiment of the present invention.
Symbol description
11～exposure control unit;
111～vertical counter;
112～horizontal counter;
12～transducer array;
13～light source;
131～transistor;
132,132a, 132b, 132c～light-emitting diode;
133,133a, 133b, 133c～resistance
Embodiment
Image pick-up device in the present embodiment has identical circuit structure with image pick-up device among Fig. 1, yet therefore the mode of its exposure control unit 11 control transducer arrays 12 and light source 13 and traditional different, will cooperate Fig. 1 and Fig. 3 to describe.
Please consult Fig. 1 again, the image pick-up device in the present embodiment comprises exposure control unit 11, transducer array 12 and light source 13.Also have vertical counter 111 and horizontal counter 112 in the exposure control unit 11.12 of transducer arrays are made up of a plurality of detecting unit (not shown)s that are arranged in matrix, and detecting unit constantly receives external light and accumulates corresponding electric charge.Light source 13 is the images that will detect in order to irradiation, makes this image can produce the light of injecting transducer array 12, so that its detecting unit exposure.
The operation of the image pick-up device of present embodiment is as follows: having 16 horizontal lines (being that transducer array 12 has 16 row detecting units) with transducer array 12 be example, and exposure control unit 11 is exported respectively and read signal R0～R15 and reset signal R0_reset～R15_reset and the 0th walk to the 15th capable detecting unit to the transducer array 12.When reset signal R0_reset～R15_reset is in high potential, can discharges in the detecting unit because of the exposure charges accumulated, and detecting unit be exposed again and the electric charge accumulation.When reading signal R0～R15 and be in high potential, detecting unit can be exported the magnitude of voltage that its stored charge produces, as a pixel data value of this detecting unit output.These pixel data values then are combined into a width of cloth and have 16 horizontal pictures.In addition, reset signal R0_reset～R15_reset makes expose again successively line by line operation with output pixel data of detecting unit with reading signal R0～R15, as shown in Figure 3.
Fig. 3 shows the transducer array scanning sequence figure of the image pick-up device in the present embodiment.At first, reset signal R0_reset produces a high potential exposes the detecting unit of the 0th row in the transducer array 12 again, and after through one section time for exposure t1, read signal R0 and produce detecting unit that a high potential makes the 0th row in the transducer array 12 magnitude of voltage output that its stored charge produced pixel data as this horizontal line (OK).Then, reset signal R1_reset～R15_reset signal then produces high potential successively with a horizontal sweep interval, and the detecting unit of the 1st～15 row is also exposed successively again, read signal R1～R15 signal after the process time identical with time for exposure t1, follow the counting operation of horizontal counter 112, produce high potential successively with a horizontal sweep interval (being the time in counting interval of horizontal counter 112), and the detecting unit of the 1st～15 row is also exported the magnitude of voltage that its stored charge produced as pixel data successively.
In addition, read the high potential pulse of representing read operation among signal R0～R15 and produce the i.e. frame frequency of image pick-up device for this reason of frequency, its corresponding image time is T.The generation time of this high potential is controlled by the horizontal counter 112 in the time for exposure controller 11.Horizontal counter 112 has a final count value 32 greater than the horizontal line number (16) of picture, and constantly repeat the operation that counts up to 32 (or 0 to 31) from 1, read signal R0～R15 and finish the time of a count cycle with horizontal counter as the cycle that produces high potential, i.e. image time.
In above-mentioned scan mode, by the sequential chart of Fig. 3 as can be known, the count cycle of horizontal counter 112 is for being scanned up to the twice (32/16=2) of the 15th row detecting unit time from the 0th row detecting unit, meaning is promptly when being scanned up to the 15th row detecting unit, concerning the detecting unit of the 0th row, horizontal counter 112 is not finished a count cycle (only finishing count cycle half) as yet, therefore, not that traditional horizontal counter makes zero like that and carries out next count cycle, but continue counting with half count cycle after finishing.During this period, horizontal counter 112 is operations of carrying out " imaginary number ", and the counting of promptly horizontal counter 112 does not have following of horizon scan line operation, does not also have corresponding pixel data to produce, and the effect of elongating image time is only arranged.Like this, make that the time for exposure t1 of the 0th row can be greater than (being half of image time by time of the 0th line scanning to the 15 row detecting units, 1/2T), and, can not produce the situation (, can not reset) that the 0th detecting unit of going is reset to the detecting unit of the 0th row because of horizontal counter 112 is not finished a count cycle as yet when not finishing exposing operation as yet.So, the time for exposure t1 of the 0th row and the time for exposure t2 of the 15th row can overlapped under this structure in period t3.Overlapping time value t3 promptly equal exposure time values t1 deduct from the 0th walk to the 15th the row detecting unit value sweep time.
Mainly be made up of the pixel data of obtaining in the time t3 that overlaps for the picture that makes last generation, exposure control unit 11 is further controlled light source 13, light source 13 is only opened in the time t3 that overlaps, and closed in the non-overlapping time.Its control signal LED_CS as shown in the figure 3.Like this,, not only can reach the dynamic image of avoiding being picked up crooked, distortion takes place, the effect of power saving also can be arranged if be applied in the wireless optical mouse.
Fig. 4 and Fig. 5 have then shown the composition of light source 13 in the present embodiment.Light source can be made of transistor 131, light-emitting diode 132 and the resistance 133 as switch in Fig. 4.Wherein, transistorized grid is to be connected in exposure control unit 11 and received signal LED_CS, and its source electrode is connected with the negative terminal of light-emitting diode 132, and then ground connection drains.Resistance 133 is connected between the anode of voltage source V DD and light-emitting diode 132.Fig. 5 shows another circuit that can be used as light source 13.Similar with the circuit of Fig. 4, it is light-emitting diode 132a, 132b, the 132c that connects three parallel connections at the source electrode of transistor 131, and three resistance 133a, 133b, 133c then are connected between light-emitting diode 132a, 132b, 132c and the voltage source V DD.
Fig. 6 shows the flow chart of captured image method in this embodiment of the invention.
At first, in step 61, provide transducer array and light source.The transducer array has a plurality of detecting units that are arranged in matrix.
Then, in step 62, in the different time for exposure, use the detecting unit of transducer array image to be detected and produces the pixel data of this image successively, and the time for exposure of each detecting unit is overlapped.
At last, in step 63, during time for exposure of detecting unit overlaps in unlatching light source irradiation image, make image detected.
Comprehensively above-mentioned, the count cycle that the present invention utilizes the operation of " imaginary number " to prolong horizontal counter, make the time for exposure amount can be greater than time difference of two row pixel datas end to end, just can make in one section special time, all detecting units in the transducer array all are in the time for exposure, simultaneously only open light source in this special time, the picture that makes last generation mainly is that the pixel data that is picked up in the special time is thus formed, and can avoid that picture in the tradition is crooked, the phenomenon of distortion.
Though the present invention discloses as above with a preferred embodiment; yet; it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; can do a spot of change and modification, therefore, protection scope of the present invention should be as the criterion with the scope institute restricted portion of claims.
Claims (4)
1. image pick-up device, in order to detected image and produce a plurality of pixel datas of this image, this image pick-up device comprises:
Transducer has a plurality of detecting units, and these detecting units expose in a plurality of time for exposure successively and export these pixel datas, and these time for exposure partly overlap;
Light source shines this image and makes this image by this sensor; And
Controller, the time for exposure of these detecting units partly overlap during in open this light source,
Wherein, these detecting units are formed an array, and described controller comprises a horizontal counter, and these detecting units are followed the counting of this horizontal counter and exported these pixel datas line by line successively,
Described horizontal counting appliance has a final count value, and this final count value is greater than the line number of described array, so that these time for exposure partly overlap.
2. image pick-up device as claimed in claim 1, wherein, this light source comprises:
Light-emitting diode;
Resistance is connected between the anode of a voltage source and this light-emitting diode; And
Switch, an end are connected in the negative terminal of this light-emitting diode and other end ground connection, and this switch is disconnected by the control of described controller and be closed.
3. image pick-up device as claimed in claim 2, wherein, this switch is a transistor, and its grid is connected with described controller, and source electrode is connected and grounded drain with the negative terminal of this light-emitting diode.
4. image pickup method, in order to utilize the image pick-up device detected image and to produce a plurality of pixel datas of this image, this image pick-up device comprises: light source; A plurality of detecting units of forming array; And the controller that comprises horizontal counter,
This image pickup method may further comprise the steps:
In a plurality of time for exposure, use these detecting units that this image is detected successively, these detecting units are followed the counting of this horizontal counter and are exported these pixel datas line by line successively, and produce these pixel datas, and these time for exposure are partly overlapped;
The time for exposure of these detecting units partly overlap during in open this image of this light source irradiation by controller, make this image detected; And
Make the line number of the final count value of described horizontal counter, so that these time for exposure partly overlap greater than described array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152982 CN1235393C (en) | 2002-11-29 | 2002-11-29 | Image picking apparatus and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152982 CN1235393C (en) | 2002-11-29 | 2002-11-29 | Image picking apparatus and method thereof |
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|---|---|
| CN1505385A CN1505385A (en) | 2004-06-16 |
| CN1235393C true CN1235393C (en) | 2006-01-04 |
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| CN 02152982 Expired - Fee Related CN1235393C (en) | 2002-11-29 | 2002-11-29 | Image picking apparatus and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016212776A1 (en) * | 2016-07-13 | 2018-01-18 | Robert Bosch Gmbh | Subpixel unit for a light sensor, light sensor, method of sensing a light signal, and method of generating an image |
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Granted publication date: 20060104 Termination date: 20201129 |