CN111970433B - Scanning system and method for controlling aiming light source - Google Patents
Scanning system and method for controlling aiming light source Download PDFInfo
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H04N23/667—Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
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- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
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Abstract
The application provides a scanning system and a method for controlling aiming light sources, which are characterized by comprising an image sensor, wherein a pixel array is sequentially exposed through a rolling shutter to collect a target image, the pixel array comprises effective pixels and non-imaging pixels, the effective pixels are pixels which are actually used for image decoding, and the non-imaging pixels are pixels which are not actually used for image decoding; an aiming light source for projecting an aiming pattern to aim at a target; a control unit to control the image sensor and the aiming light source such that the aiming light source is in an off state during an exposure time of the active pixels and the aiming light source is in an on state during at least a portion of the exposure time of the non-imaging pixels.
Description
Technical Field
The application relates to a scanning system and a method for controlling aiming light sources.
Background art:
the existing image reader is divided into two exposure modes of global exposure and rolling shutter exposure, wherein the global exposure generally refers to simultaneous exposure of all pixels, the rolling shutter exposure refers to sequential exposure of a pixel array, the global exposure mode can avoid a jelly effect and can generate a clear image for a high-speed moving object, and the rolling shutter exposure can generate a jelly effect because of the time difference of pixel exposure and can not generate a clear image for the moving object. Generally, ccd (Charge Coupled Device) and cmos (Complementary Metal Oxide Semiconductor) are used for global exposure, and cmos (Complementary Metal Oxide Semiconductor) is used for rolling shutter exposure, so that cmos of rolling shutter exposure has price advantage, less noise and clearer imaging compared with ccd and cmos of global exposure, and thus, the application is wider.
In the field of optical image reading, an aiming light source is generally required to project an aiming pattern to indicate the reading range of an image reader, and since the brightness of the aiming pattern is higher than that of the surrounding environment, local overexposure of an image is often caused, and the reading efficiency is affected. The image reader of global exposure can stagger the starting time of the aiming light source and the exposure time of all pixels through a blanking technology because the exposure of all pixels is synchronous, so that aiming patterns cannot appear in the acquired image, and local overexposure is avoided; the rolling shutter exposure cannot adopt the same blanking technology as the global exposure because the pixels are sequentially exposed and the exposure time of the pixels is asynchronous.
The present application addresses the above problems by providing a new scanning system and method for controlling aiming light source, and adopting new methods and technical means to solve these problems.
Disclosure of Invention
In view of the problems encountered in the background art, the present application is directed to a scanning system and method for controlling an aiming light source to avoid an image overexposure caused by an aiming pattern projected by the aiming light source.
In order to achieve the purpose, the following technical means are adopted in the application:
the application provides a scanning system of control sighting light source, its characterized in that includes:
an image sensor sequentially exposing a pixel array through a rolling shutter to acquire a target image, the pixel array including effective pixels and non-imaging pixels, the effective pixels being pixels actually used for image decoding, the non-imaging pixels being pixels not actually used for image decoding;
an aiming light source for projecting an aiming pattern to aim at a target;
a control unit to control the image sensor and the aiming light source such that the aiming light source is in an off state during an exposure time of the active pixels and the aiming light source is in an on state during at least a portion of the exposure time of the non-imaging pixels.
Optionally, the image sensor is sequentially exposed in units of pixel rows, a pixel row in which the effective pixels exist in one row is defined as an effective pixel row, and the aiming light source is in an off state during an exposure time of the effective pixel row.
Optionally, the entire row is defined as a non-imaging pixel row of the non-imaging pixels, and the aiming light source is in an on state for at least part of the exposure time of the non-imaging pixel row.
Optionally, the exposure time of the non-imaging pixel row partially coincides with the exposure time of the effective pixel row, and the aiming light source is in an on state during the exposure time when the non-imaging pixel row is exposed alone and in an off state when the exposure times coincide.
Optionally, the effective pixels are pixels actually participating in light sensing, and the non-imaging pixels are pixels not actually participating in light sensing.
Optionally, the image of the active pixels is used to extract characters for decoding, and the image of the non-imaged pixels is removed during image pre-processing.
Optionally, the aiming pattern includes an aiming box for framing a target, the image of the aiming box on the pixel array framing substantially all of the active pixels.
Optionally, an illumination source is included to provide illumination light, and the control unit controls the illumination source to be in an on state during the exposure time of the active pixels of the image sensor and to be in an off state during the exposure time of the non-imaging pixels.
The application provides a method for controlling aiming light sources, which is characterized by comprising the following steps:
projecting an aiming pattern through an aiming light source to aim at a target;
the pixel array of the image sensor is sequentially exposed, and the aiming light source is turned off when the pixel is an effective pixel, and is turned on according to a preset program when the pixel is a non-imaging pixel.
Optionally, the preset program comprises turning on the aiming light source only for the exposure time of the non-imaged pixels alone and turning off the aiming light source when the exposure time of the non-imaged pixels coincides with the exposure time of the active pixels.
The application provides a scanning system of control sighting light source, its characterized in that includes:
the camera comprises a lens and an image sensor, wherein the lens is used for collecting a target image, and the image sensor sequentially exposes the pixel array through a rolling shutter to convert the target image into an electric signal;
an aiming light source to project an aiming pattern aiming at a target, the aiming pattern comprising a spot located in a field of view of the lens, the spot remaining relatively positionally fixed relative to the field of view of the lens over a depth of field of the lens such that the aiming pattern remains relatively positionally fixed via images of the lens on the pixel array;
and the control unit is used for controlling the camera and the aiming light source so that the aiming light source is in a closed state within the exposure time of the pixel corresponding to the image of the facula on the pixel array.
Optionally, the pixel array is sequentially exposed in units of pixel rows, and the aiming light source is in an off state during the exposure time of the pixel row corresponding to the image of the light spot.
Alternatively, the pixel array is sequentially exposed in units of pixel rows, and the aiming light source is in an on state for an exposure time of the pixel rows that is shifted from the image of the aiming pattern.
Optionally, the aiming light source periodically projects the aiming pattern.
Optionally, the control unit controls automatic exposure of the camera to adjust an exposure time of a next frame of image according to a quality of a previous frame of image, and adjusts an on-time of the aiming light source according to the exposure time of the next frame of image.
Optionally, the aiming pattern includes an aiming box for framing a target, the aiming box indicating a field of view range of the lens.
The application provides a method for controlling aiming light sources, which is characterized by comprising the following steps:
projecting an aiming pattern by an aiming light source to aim a target, the aiming pattern comprising a spot of light located in a field of view of the lens;
sequentially exposing a pixel array of an image sensor;
turning off the aiming light source during an exposure time of a pixel corresponding to an image of the aiming pattern on the pixel array.
Optionally, the pixel array is sequentially exposed in units of pixel rows, and the aiming light source is turned off during the exposure time of the pixel row corresponding to the image of the light spot.
Optionally, the pixel array is sequentially exposed in units of pixel rows, and the aiming light source is turned on within an exposure time of a pixel row on the pixel array, which is staggered from the pixel of the light spot.
Optionally, the aiming light source periodically projects the aiming pattern.
The application provides a scanning system of control sighting light source, its characterized in that includes:
the camera is used for collecting a target image;
an aiming light source for projecting an aiming pattern to aim at a target;
and the control unit is used for controlling the camera and the aiming light source so that the aiming light source is started only at partial frames in multi-frame images continuously acquired by the camera.
Optionally, the control unit decodes only images captured by the camera when the aiming light source is turned off.
Optionally, the camera transmits only images acquired when the aiming light source is turned off to the control unit.
Optionally, the camera comprises an image sensor that sequentially exposes an array of pixels through a rolling shutter to convert a target image into an electrical signal; defining the control unit to control the aiming light source to be switched on to a first mode only in part of frames; defining the control unit to control the aiming light source to be in an off state in a second mode within the exposure time of a pixel row corresponding to the image of the aiming pattern in the pixel array; the control unit starts a first mode when the exposure time of the pixel row is greater than a threshold value, and starts a second mode when the exposure time of the pixel row is lower than the threshold value.
Optionally, the control unit controls automatic exposure of the camera to adjust an exposure time of a next frame image according to a quality of a previous frame image, and selects to start the first mode or the second mode according to the exposure time of the next frame image.
The application provides a method for controlling aiming light sources, which is characterized by comprising the following steps:
projecting an aiming pattern through an aiming light source to aim at a target;
the method comprises the steps that a target image is collected through a camera, and in a multi-frame image continuously collected by the camera, the aiming light source is started only in partial frames.
Optionally, the control unit decodes only images captured by the camera when the aiming light source is turned off.
Optionally, the camera transmits only images acquired when the aiming light source is turned off to the control unit.
Optionally, the camera comprises an image sensor that sequentially exposes an array of pixels through a rolling shutter to convert a target image into an electrical signal; defining the control unit to control the aiming light source to be switched on to a first mode only in part of frames; defining the control unit to control the aiming light source to be in an off state in a second mode within the exposure time of a pixel row corresponding to the image of the aiming pattern in the pixel array; the control unit starts a first mode when the exposure time of the pixel row is greater than a threshold value, and starts a second mode when the exposure time of the pixel row is lower than the threshold value.
Optionally, the control unit controls automatic exposure of the camera to adjust an exposure time of a next frame image according to a quality of a previous frame image, and selects to start the first mode or the second mode according to the exposure time of the next frame image.
Compared with the prior art, the invention has the following beneficial effects:
the image sensor sequentially exposes the pixel array through the rolling shutter to collect a target image, the pixel array comprises effective pixels and non-imaging pixels, the effective pixels are pixels actually used for image decoding, the non-imaging pixels are pixels not actually used for image decoding, the control unit controls the image sensor and the aiming light source, so that the aiming light source is in a closed state within the exposure time of the effective pixels, the aiming light source is in an open state within at least part of the exposure time of the non-imaging pixels, the open time of the aiming light source is staggered with the exposure time of the effective pixels, and local overexposure of the image collected by exposure of the effective pixels is avoided.
The image sensor sequentially exposes the pixel array through the rolling shutter to convert a target image into an electric signal, and the control unit controls the camera and the aiming light source to enable the aiming light source to be in a closed state within the exposure time of the pixel corresponding to the image of the light spot on the pixel array, so that the light spot cannot be acquired by the image sensor, and the image is prevented from being locally overexposed due to the light spot.
The control unit controls the camera and the aiming light source, so that the aiming light source is started only in partial frames in multi-frame images continuously collected by the camera, aiming is performed by projecting aiming patterns through the aiming light source, and meanwhile, the aiming light source is not started in other frames, and the collected images cannot be overexposed due to the aiming patterns.
Drawings
FIG. 1 is a schematic diagram of a handheld terminal according to the present application;
FIG. 2 is an enlarged schematic view of the scan head of FIG. 1;
FIG. 3 is a block diagram of a scanning system of the present application;
FIG. 4 is a schematic diagram of an image sensor according to the present application;
FIG. 5 is a schematic view of another image sensor of the present application;
FIG. 6 is a timing diagram of the control unit controlling the image sensor and the aiming light source according to an embodiment of the present application;
FIG. 7 is a timing diagram of the control unit controlling the image sensor and the aiming light source in another embodiment of the present application;
FIG. 8 is a timing diagram of the control unit controlling the image sensor and the aiming light source in another embodiment of the present application;
FIG. 9 is a timing diagram of the control unit controlling the image sensor and the aiming light source in another embodiment of the present application;
FIG. 10 is a flow chart of a method of controlling an aiming light source according to an embodiment of the present application;
FIG. 11 is a flow chart of a method of controlling aiming a light source according to another embodiment of the present application;
FIG. 12 is a flow chart of a method of controlling aiming a light source according to another embodiment of the present application.
Detailed description of the embodiments reference is made to the accompanying drawings in which:
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Detailed Description
For a better understanding of the objects, structure, features, and functions of the present application, reference should be made to the drawings and detailed description that follow.
The scanning system for controlling the aiming light source 7 is mainly applied to a scanning system of a rolling shutter, and is used for avoiding or reducing local overexposure of an image caused by the aiming pattern 8 projected by the aiming light source 7. The scanning system can be used for various scanning engines, scanning guns, ring scanners, handheld terminals 1 (PDAs), stationary scanners, image recognition robots, and the like. The structure, function and control method of the scanning system of the present application will be described in detail below by taking the handheld terminal 1 as an example.
As shown in fig. 1, fig. 2 and fig. 3, the scanning system of the embodiment of the present application is applied to the handheld terminal 1, where the handheld terminal 1 mainly includes: camera 3, aiming light source 7 and control unit 12.
The camera 3 comprises a lens for collecting a target image and an image sensor 4 for performing photoelectric conversion on the target image, the field of view of the lens is known in advance, and the image sensor 4 sequentially exposes a pixel array through a rolling shutter to collect the target image in cooperation with the lens and converts the target image into an electric signal. The rolling shutter generally refers to sequential exposure in units of pixel rows, but there are sequential exposure in units of a plurality of rows of pixel rows, regional exposure of pixels, and the like, and the rolling shutter of the present application is preferably a progressive exposure method. Referring additionally to the image sensor 4 shown in fig. 4, the pixel array (which is only schematic and does not represent the size and number of actual pixels) includes effective pixels 5 and non-imaging pixels 6, the effective pixels 5 are pixels actually used for image decoding, the non-imaging pixels 6 are pixels not actually used for image decoding, and the effective pixels 5 and the non-imaging pixels 6 will be further explained later with reference to the two embodiments shown in fig. 4 and 5.
The aiming light source 7 is used to project an aiming pattern 8 to guide a user to aim at a target. The aiming light source 7 can generate the aiming pattern 8 by means of a laser matched with a Diffraction Optical Element (DOE) or an LED matched with a lens, so that the aiming pattern 8 has a clear shape or outline and the brightness is obviously higher than the brightness of the surrounding environment. The aiming pattern 8 comprises a centrally located spot 9 (typically cross-shaped, but also straight or circular, etc.) and peripherally located aiming blocks 10, some of the aiming patterns 8 having no aiming block 10 but only the spot 9. Within the depth of field of the lens, the spot 9 is arranged to be centered in the field of view of the lens so that the position relative to the field of view of the lens remains fixed, since, although the field of view of the lens varies proportionally with distance, the size of the spot 9 also varies in approximately the same proportion with distance, so that the position occupied by the spot 9 in the field of view of the lens remains substantially unchanged. The image 11 of the light spot 9 formed by the lens on the pixel array of the image sensor 4 is then kept relatively fixed, and it is also known in advance that the image 11 of the light spot 9 usually falls on several pixel rows in the center of the pixel array.
Turning back to the image sensor 4 in the embodiment shown in fig. 4, the imaging range 15 of the lens is shown by a circular dotted line, which covers a part of the pixel array, and these pixels actually used for photosensitive imaging are the effective pixels 5; pixels outside the imaging range 15 of the lens are not actually used for light sensing, so that photoelectric conversion cannot be performed to generate an image, and are not used for image decoding, the pixels are the non-imaging pixels 6, the non-imaging pixels 6 can be used for calculating dark current generated in pixels, so that the dark current in the effective pixels 5 can be removed through an algorithm, the current generated by the effective pixels 5 through photoelectric conversion is obtained, and the noise reduction effect is achieved. When the pixel array is exposed sequentially in a pixel row unit, the whole row is defined as a non-imaging pixel 6 row 60 of the non-imaging pixels 6, and the pixel row with the effective pixels 5 is defined as an effective pixel 5 row 50, so that the non-imaging pixel 6 row 60 is actually a pixel row not participating in light sensing, and the effective pixel 5 row 50 is a pixel row at least partially or completely having pixels actually participating in light sensing. The image 11 of the light spot 9 is located in the center of the molding range of the lens and also in the center of the pixel array, and keeps a relative position fixed relative to the pixel array, and the aiming frame 10 is slightly larger than the field range of the lens and cannot be collected by the camera 3, so that the image overexposure cannot be caused.
In another embodiment of the image sensor 4 shown in fig. 5, the imaging range 15 of the lens is shown as a circular dotted line, which covers substantially the entire pixel array, so that the entire pixel array is sensitive to light. The aiming pattern 8 projected by the aiming light source 7 also comprises a light spot 9 (generally in a cross shape, and also in a straight shape or a circle shape, etc.) and an aiming frame 10, wherein the light spot 9 and the aiming frame 10 are both located in the field of view of the camera 3, unlike the previous embodiment, the aiming frame 10 is collected by the lens, the position of the image 11 of the aiming frame 10 on the pixel array is known in advance, the image 11 formed by the aiming frame 10 on the pixel array is set in advance to roughly frame out all the effective pixels 5, other pixels on the pixel array are defined as non-imaging pixels 6, and the image 11 of the aiming frame 10 is actually located on the non-imaging pixels 6, so that even if the aiming frame 10 is located in the field of view of the lens, the image overexposure is not caused. Firstly, image signals acquired by the pixel array are subjected to image preprocessing, and image signals acquired by the non-imaging pixels 6 are cut off and do not need to be subjected to image decoding; the image signal acquired by the effective pixel 5 will be used for extracting characters and for image decoding.
In some embodiments (not shown, the same applies below), the imaging range of the lens is not necessarily circular, and the imaging range 15 of some special-shaped lenses may also be elliptical or even square.
An illumination source 13 is also typically included to provide illumination light to illuminate the target.
The control unit 12 is used to control the image sensor 4 and the aiming light source 7, and specifically, to control the exposure process of the pixel array of the image sensor 4 according to a preset program stored in the memory and to control the on-state and off-state of the aiming light source 7 during the exposure process.
The control unit 12 controls the frame rate of the camera 3 according to a preset program stored in the memory, and controls the exposure time of the pixel row of the image sensor 4 through automatic exposure, so as to adjust the exposure time of the pixel row when the next frame of image is acquired according to the quality of the previous frame of image.
The control unit 12 may control the timing of the aiming light source 7 and the image sensor 4 by various schemes, all aimed at eliminating or reducing the local overexposure of the target pattern by the aiming pattern 8 (mainly the light spot 9).
The first scheme is as follows: referring to fig. 4 and 5, since the image 11 of the light spot 9 is located on the effective pixel 5 row 50, when the on-time of the aiming light source 7 is synchronized with the exposure time of the effective pixel 5 row 50, the image is partially overexposed. Referring to the timing diagram of fig. 6, first turning on the aiming light source 7 to aim at a target, then exposing through the camera 3 to capture a target image, the image sensor 4 of the camera 3 sequentially exposes the pixel array through a rolling shutter, first exposing a number of the non-imaging pixel 6 rows 60 located at the edge of the pixel array, the individual exposure time of the non-imaging pixel 6 rows 60 will last for a preset time t, and then the active pixel 5 rows 50 will start to expose. After the non-imaging pixel 6 row 60 is continuously exposed for a preset time t, the aiming light source 7 is turned off, and then the effective pixel 5 row 50 is sequentially exposed, at this time, the effective pixel 5 row 50 and the non-imaging pixel 6 row 60 are simultaneously exposed, the exposure time of the two is overlapped, and since the aiming light source 7 is in a turned-off state at this time, an image overexposure is not caused. When all the effective pixel 5 rows 50 in one frame are exposed, the aiming light source 7 is turned on to project the aiming pattern 8, and the remaining non-imaging pixel 6 rows 60 are sequentially exposed, at this time, the image sensor 4 may have started the exposure acquisition of the image of the next frame, and the image of the next frame is still at the exposure time of the first non-imaging pixel 6 rows 60, but the exposure time of the effective pixel 5 rows 50 is not started, and the aiming light source 7 is turned on during this time, so that the image is not overexposed. Usually, the control unit 12 controls the exposure time of the pixel rows of the image sensor 4 through automatic exposure to adjust the exposure time of the pixel rows when acquiring the next frame image according to the quality of the previous frame image, and the frame rate of the image sensor 4 is preset, and the start time interval of the sequential exposure between the pixel rows is also preset, and after the control unit 12 sets the exposure time of the next frame image, the on-time of the aiming light source 7 can be set according to the exposure times of the non-imaging pixel 6 row 60 and the effective pixel 5 row 50, so that the aiming light source 7 is always in the off-state during the exposure time of the effective pixel 5 and is in the on-state during at least part of the exposure time of the non-imaging pixel 6.
Of course, the control unit 12 may not control the image sensor 4 by automatic exposure, but may set a fixed exposure time such that the exposure time of the pixel row is maintained at a fixed length, the pixel array periodically and sequentially exposes the non-imaging pixel 6 row 60 and the effective pixel 5 row 50, the aiming light source 7 is also configured to periodically project the aiming pattern 8, the aiming light source 7 is turned on for the exposure time of the non-imaging pixel 6 row 60 alone, and the aiming light source 7 is turned off for the exposure time of the effective pixel 5 row 50.
Scheme II: referring to fig. 4 and 5, since the image 11 of the light spot 9 is located on the effective pixel 5 row 50, when the on-time of the aiming light source 7 is synchronized with the exposure time of the effective pixel 5 row 50, the image is partially overexposed. Note that the position of the image 11 of the light spot 9 on the pixel array is kept substantially fixed, as long as it is ensured that the aiming light source 7 is in the off state within the exposure time of the pixel rows where the image 11 of the light spot 9 is located, the light spot 9 will not cause image overexposure, and the pixel rows corresponding to the image 11 of the light spot 9 are known in advance. Referring to the timing chart of fig. 7, the aiming light source 7 is turned on first, then the pixel array is sequentially exposed, when the exposure of the pixel row corresponding to the image 11 of the light spot 9 is started, the aiming light source 7 is turned off, and when the exposure of the pixel row corresponding to the image 11 of the light spot 9 is completed, the aiming light source 7 is turned on again. Since the proportion of the pixel row corresponding to the image 11 of the light spot 9 to the total pixel array is small, the second scheme controls the on and off time of the aiming light source 7 through precise control in space (the pixel row corresponding to the image 11 of the light spot 9 and other pixel rows), and the second scheme has longer on time of the aiming light source 7 relative to the first scheme, so that the aiming pattern 8 can be clearer; of course, it is also possible to switch off the aiming light source 7 during the exposure time of the pixel row corresponding to the image 11 of the spot 9, and to switch on the aiming light source 7 during some but not all of the other time.
The third scheme is as follows: referring to the timing chart shown in fig. 8, in the multi-frame images continuously captured by the camera 3, the aiming light source 7 is turned on only in a part of frames, so that the aiming pattern 8 is not captured in other multi-frame images, the camera 3 only transmits the image captured when the aiming light source 7 is turned off to the control unit 12, and the control unit 12 only decodes the image captured by the camera 3 when the aiming light source 7 is turned off, thereby improving the decoding efficiency. Of course, the camera 3 may also transmit all the acquired images to the control unit 12, but the control unit 12 only decodes the images acquired by the camera 3 when the aiming light source 7 is turned off. The third scheme is not only applicable to the rolling shutter, but also applicable to the global shutter. However, scheme three sacrifices decoding speed by decoding only partial images, as compared to scheme one and scheme two.
And the scheme is as follows: referring to the timing chart shown in fig. 9, when the control unit 12 adjusts the exposure time of the pixel array through automatic exposure so that the exposure time of the pixel row is long, as the exposure times of the effective pixel 5 rows 50 of the previous two frames of images are connected together, there is no exposure time of the non-imaging pixel 6 row 60 in the middle, so that the first and second schemes cannot be adopted, and only the third scheme can be adopted; and the exposure time of the third frame image is shorter, the exposure time of the second frame image and the third frame image directly existing in the non-imaging pixel 6 row 60 is independent, the aiming light source 7 can be started to project the aiming pattern 8, and therefore the scheme one or the scheme two can be adopted. Defining an adopted scheme three as a first mode, defining an adopted scheme one or scheme two as a second mode, starting the first mode by the control unit 12 when the control unit 12 judges that the exposure time of the pixel row is greater than a threshold value, and starting the second mode by the control unit 12 when the exposure time of the pixel row is less than the threshold value; the threshold value may be set to an appropriate value by calculation or after a plurality of tests in advance.
The camera 3, the aiming light source 7 and the illumination source 13 of this embodiment are integrated together to form a scanning head 2, and then the control unit 12 on the main board of the handheld terminal 1 controls the scanning head 2 to collect a target image. In some embodiments (not shown, the same applies hereinafter), the camera 3, the aiming light source 7, the illumination source 13, and the control unit 12 are integrated together to form the scanning engine, and then the target image can be acquired by the scanning engine through an integrated control switch, and the ring scanner adopts a similar structure. In some embodiments, a decoding chip dedicated to decoding the target image may be additionally provided, and not decoded by the control unit 12.
The scanning system and method for controlling aiming light sources have the following beneficial effects:
the image sensor 4 sequentially exposes a pixel array through a rolling shutter to acquire a target image, wherein the pixel array comprises effective pixels 5 and non-imaging pixels 6, the effective pixels 5 are pixels actually used for image decoding, the non-imaging pixels 6 are pixels not actually used for image decoding, the control unit 12 controls the image sensor 4 and the aiming light source 7, so that the aiming light source 7 is in a closed state within the exposure time of the effective pixels 5, the aiming light source 7 is in an open state within at least part of the exposure time of the non-imaging pixels 6, the open time of the aiming light source 7 is staggered with the exposure time of the effective pixels 5, and partial overexposure of the image acquired by exposing the effective pixels 5 is avoided.
The image sensor 4 sequentially exposes the pixel array through the rolling shutter to convert a target image into an electric signal, and the control unit 12 controls the camera 3 and the aiming light source 7 to enable the aiming light source 7 to be in a closed state within the exposure time of the pixel corresponding to the image 11 of the light spot 9 on the pixel array, so that the light spot 9 cannot be acquired by the image sensor 4, and the image is prevented from being locally overexposed due to the light spot 9.
The control unit 12 controls the camera 3 and the aiming light source 7, so that in a plurality of frames of images continuously collected by the camera 3, the aiming light source 7 is turned on only in a part of frames, namely, the aiming pattern 8 is projected by the aiming light source 7 to play an aiming role, and meanwhile, the aiming light source 7 is not turned on in other frames, and the collected images cannot be overexposed due to the aiming pattern 8.
The above detailed description is only for the purpose of illustrating the preferred embodiments of the present application, and not for the purpose of limiting the scope of the present application, therefore, all technical changes that can be made by applying the present specification and the drawings are included in the scope of the present application.
Claims (8)
1. A scanning system for controlling an aiming light source, comprising:
the camera is used for collecting a target image and comprises an image sensor, and the image sensor sequentially exposes pixel rows of a pixel array through a rolling shutter to convert the target image into an electric signal;
an aiming light source for projecting an aiming pattern to aim at a target;
the control unit is used for controlling the camera and the aiming light source, and defining that the aiming light source is started to be in a first mode only in partial frames in multi-frame images continuously collected by the camera by the control unit; defining the control unit to control the aiming light source to be in an off state in a second mode within the exposure time of a pixel row corresponding to the image of the aiming pattern in the pixel array; the control unit activates a first mode when an exposure time of the pixel row of the pixel array is greater than a threshold value, and activates a second mode when the exposure time of the pixel row of the pixel array is lower than the threshold value.
2. The scanning system of claim 1, wherein: the control unit only decodes images acquired by the camera when the aiming light source is turned off.
3. The scanning system of claim 1, wherein: the camera only transmits the image collected when the aiming light source is turned off to the control unit.
4. The scanning system of claim 1, wherein: the control unit controls the automatic exposure of the camera so as to adjust the exposure time of the next frame of image according to the quality of the previous frame of image, and the first mode or the second mode is selected and started according to the exposure time of the next frame of image.
5. A method of controlling a targeting light source, comprising the steps of:
projecting an aiming pattern through an aiming light source to aim at a target;
acquiring a target image through a camera, wherein the camera comprises an image sensor, the image sensor sequentially exposes pixel rows of a pixel array through a rolling shutter to convert the target image into an electric signal, and the control unit is defined to control the aiming light source to be started in a first mode only in partial frames in multi-frame images continuously acquired by the camera; defining the control unit to control the aiming light source to be in an off state in a second mode within the exposure time of a pixel row corresponding to the image of the aiming pattern in the pixel array; the control unit starts a first mode when the exposure time of the pixel row is greater than a threshold value, and starts a second mode when the exposure time of the pixel row is lower than the threshold value.
6. The method of controlling a collimated light source of claim 5, wherein: the control unit only decodes images acquired by the camera when the aiming light source is turned off.
7. The method of controlling a collimated light source of claim 5, wherein: the camera only transmits the image collected when the aiming light source is turned off to the control unit.
8. The method of controlling a collimated light source of claim 5, wherein: the control unit controls the automatic exposure of the camera so as to adjust the exposure time of the next frame of image according to the quality of the previous frame of image, and the first mode or the second mode is selected and started according to the exposure time of the next frame of image.
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| CN115577726A (en) * | 2022-11-11 | 2023-01-06 | 无锡盈达聚力科技有限公司 | Image forming apparatus and image forming method |
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| CN113542592A (en) | 2021-10-22 |
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