CN103970293A - Optical navigation device and optical navigation method - Google Patents
Optical navigation device and optical navigation method Download PDFInfo
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- CN103970293A CN103970293A CN201310046926.XA CN201310046926A CN103970293A CN 103970293 A CN103970293 A CN 103970293A CN 201310046926 A CN201310046926 A CN 201310046926A CN 103970293 A CN103970293 A CN 103970293A
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Abstract
Disclosed are an optical navigation device and an optical navigation method. The optical navigation device comprises a light source element, an image sensing element and a processing unit. The processing unit is electrically connected with the light source unit and the image sensing element. The light source element is used for generating a light source. The image sensing element captures a first image at a first time when the light source projects to a reflecting surface. The processing unit calculates image quality parameters related to the first image, and determines a section size of comparison between the first image and a second image.
Description
Technical field
The invention relates to a kind of optical navigator and optical navigation method; Specifically, the invention relates to a kind of optical navigator and the optical navigation method that can dynamically adjust comparison resource block size.
Background technology
Computer has become modern in indispensable necessity in life.Existing computer peripheral device, most mouses that adopt are as one of main input media.In the time of user's operating computer, usually need to move the cursor on screen by mouse, even click needed option, application program etc. by mouse, therefore mouse has just like become the important bridge that user is connected with computer, therefore Ge Jia manufacturer also releases the mouse that adopts various different technologies.More release on the market in recent years optical navigator, for example: optics finger ring mouse (Optical Finger Mouse; OFM).
Optical navigator is to utilize light source component throw light to reflecting surface, and with an Image Sensor pick-up image, again with the processing unit comparison image of acquisition continuously, judge by this displacement of optical navigator in a time interval, and then according to the cursor on displacement control screen, reach the effect of navigation.
Existing optical navigator is that the comparison resource block size (for example: long and wide 8 pixels that are all) of presetting is compared adjacent image, so that optical navigator is moved to detection.That this default comparison block is of a size of is fixing, cannot adjust.(for example: the factors such as working surface is not good enough, out of focus) in some cases, the image that Image Sensor captured is comparatively fuzzy, if default comparison block is undersized, can cause navigation effect to be not so good as user's expection.But, if default comparison resource block size is strengthened, while comparison, will consume the too much resource of optical navigator.
In view of this, this area still need badly a kind of can be correctly and the means of optical navigation technique of carrying out efficiently image comparison.
Summary of the invention
For solving foregoing problems, the invention provides a kind of optical navigator and a kind of optical navigation method.
Optical navigator provided by the present invention comprises a light source component, an Image Sensor and a processing unit.This processing unit is electrically connected to this light source component and this Image Sensor.This light source component is in order to produce a light source.This Image Sensor is in the time of this light source projects to one reflecting surface, in very first time point acquisition one first image.This processing unit calculates the image quality parameter with this first correction of image, and determines that according to this image quality parameter one between this first image and one second image compare resource block size.
Optical navigation method provided by the present invention is applicable to an optical navigator.This optical navigator comprises a light source component, an Image Sensor and a processing unit.This optical navigation method comprises the following step: (a) in this light source component during by light source projects to reflecting surface, capture one first image by this Image Sensor in a very first time point, (b) calculated and an image quality parameter of this first correction of image by this processing unit, and (c) determine that according to this image quality parameter one first between this first image and one second image compare resource block size.
The present invention can be according to the various different information of image, calculates image quality parameter, then the comparison resource block size using while determining follow-up comparing according to image quality parameter.In the time that the quality of image is better, preferably compare effect because can obtain, therefore adopt less comparison resource block size, can carry out in more efficient mode with the comparison between image.In the time of the inferior quality of image, adopt larger comparison resource block size, to maintain the comparison result of certain quality.Accordingly, optical navigator provided by the present invention and optical navigation method can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
For above-mentioned purpose of the present invention, technical characterictic and advantage can be become apparent, below coordinate appended graphic being elaborated with preferred embodiment.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form limitation of the invention.In the accompanying drawings:
Figure 1A describes the schematic diagram of the optical navigator 1 of the first embodiment;
Figure 1B describes the associated schematic diagram of time point t1, t2 and image 102,104;
Fig. 2 A describes the schematic diagram of the optical navigator 2 of the 3rd embodiment;
Fig. 2 B describes the associated schematic diagram of time point t3, t4, t5 and image 202,204,206;
Fig. 2 C describes the schematic diagram of multiple correlations of the 3rd embodiment;
Fig. 3 describes the associated schematic diagram of time point t6, t7, t8, t9, t10 and image 301,302,303,304,305;
Fig. 4 describes the process flow diagram of the fifth embodiment of the present invention;
Fig. 5 A describes the main process flow diagram of the sixth embodiment of the present invention;
Fig. 5 B describes the first detail flowchart of step S54;
Fig. 5 C describes the second detail flowchart of step S54; And
Fig. 5 D describes the third detail flowchart of step S54.
Drawing reference numeral explanation:
1 optical navigator
11 light source components
13 processing units
15 Image Sensors
17 storage elements
100 corresponding tables
102,104 images
T1, t2 time point
2 optical navigators
202,204,206 images
T3, t4, t5 time point
Cor_0 ~ Cor_24 correlation
301,302,303,304,305 images
T6, t7, t8, t9, t10 time point
Embodiment
Below will explain optical navigator provided by the present invention and optical navigation method by embodiment.But embodiments of the invention not must can be implemented in any environment, application or mode as described embodiments in order to limit the present invention.Therefore, be only explaination object of the present invention about the explanation of embodiment, but not in order to direct restriction the present invention.Palpus expositor, in following examples and diagram, has omitted and has not illustrated with the non-directly related element of the present invention.
The first embodiment of the present invention is an optical navigator 1, and its schematic diagram is depicted in Figure 1A.Optical navigator 1 comprises a light source component 11, a processing unit 13, an Image Sensor 15 and a storage element 17, and processing unit 13 is electrically connected to light source component 11, Image Sensor 15 and storage element 17.
Light source component 11 can be light emitting diode (Light Emitting Diode; Or other light source components well-known to those skilled in the art LED).Processing unit 13 can be any one in various processor well-known to those skilled in the art, central processing unit (central processing unit), microprocessor or other calculation elements.Image Sensor 15 can be CMOS (Complementary Metal Oxide Semiconductor) semiconducting (Complementary Metal Oxide Semiconductor; CMOS) photo-sensitive cell or Image Sensor well-known to those skilled in the art.Storage element 17 can be various built-in storeies or those skilled in the art can expect and have the Storage Media of identical function easily.
In the time that the electric power of optical navigator 1 is unlocked, light source component 11 can produce a light source (not illustrating).In the time of light source projects to reflecting surface, Image Sensor 15 is sequentially in time point t1, t2 pick-up image 102,104 respectively, as Figure 1B describes.Below narration will describe with time point t1, t2 and image 102,104, but those skilled in the art should expect that optical navigator 1 can adopt identical technological means to process the image that Image Sensor 15 captures in other times point easily.
In the present embodiment, after Image Sensor 15 pick-up images 104, processing unit 13 can calculate an image quality parameter relevant to image 104, then determines the resource block size of comparing between image 102 and image 104 according to this image quality parameter.Afterwards, processing unit 13 is again according to this comparison resource block size, comparison image 102 and image 104, and the displacement in the time interval that calculating optical guider 1 defines at time point t1, t2 by this, and then reach the effect of navigation.Must expositor, how to compare image 102 and the technology of image 104 to determine that the displacement of optical navigator 1 is well known to those skilled in the art, and be not emphasis of the present invention, therefore superfluous words not.
How the present embodiment calculates image quality parameter and how to determine comparison resource block size according to image quality parameter if being hereby described in detail in detail.The present embodiment is for example, using the brightness fluctuation degree (: the standard deviation of the brightness value of image 104 interior all pixels) of image 104 as image quality parameter.The corresponding table 100 that storage element 17 stores, it records the corresponding comparison resource block size of different images Q factor.Processing unit 104 calculates after image quality parameter, just decides the size of comparison resource block size by inquiring about corresponding table 100.
Further, in the time that the brightness fluctuation degree of image 104 is larger, represent that the feature in image 104 is more, therefore, even if adopt less comparison resource block size to compare image 104 and image 102, still can easily compare correct position.Contrary, when the brightness fluctuation degree of image 104 hour, represent that the feature in image 104 is less, therefore, must adopt larger comparison resource block size compare image 104 and image 102, can improve the possibility of comparison to tram.In view of this,, if with the larger larger brightness fluctuation degree of image quality parameter representative, the content that corresponding table 100 is recorded can be that larger image quality parameter corresponds to less comparison resource block size.Otherwise if with the larger less brightness fluctuation degree of image quality parameter representative, the content that corresponding table 100 is recorded can be that large image quality parameter corresponds to larger comparison resource block size.
From above stated specification, the first embodiment is the resource block size of comparing using while deciding image 104 and image 102 to compare according to the brightness fluctuation degree of image 104.When the quality of image 104 better (contain more feature, brightness fluctuation degree is higher), adopt less comparison resource block size, so that comparing between image 104 and image 102 can be carried out in more efficient mode.When the inferior quality of image (contain less feature, brightness fluctuation degree is lower), adopt larger comparison resource block size, to maintain the comparison result of certain quality.By configuration and the technology of the first embodiment, optical navigator 1 can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
About the second embodiment of the present invention, please still consult Figure 1A and Figure 1B.Why the Main Differences of the second embodiment and the first embodiment is adopted image quality parameter.
In the present embodiment, after Image Sensor 15 pick-up images 104, processing unit 13 can first carry out filtering processing to image 104, and therefore obtains a filtering image (not illustrating).Palpus expositor, after 13 filtering of treated unit are processed, the larger person of absolute value of the pixel value of filtering image, represent its feature more obvious (for example: this place's brightness fluctuation is large), and the less person of the absolute value of pixel value (that is, more approach 0), represent that its feature is weaker.Then, processing unit 13, according to this filtering image, calculates the image quality parameter relevant to image 104.The present embodiment provides the multiple mode of calculating image quality parameter according to filtering image, can select a use, is described below.
If employing first kind of way, processing unit 13 can take absolute value to all pixel values of this filtering image, then add up be greater than a threshold value person with one add total value, and add total value as image quality parameter using this.If adopt the second way, processing unit 13 can take absolute value to all pixel values of this filtering image, then calculates a sum that is greater than a threshold value person, and using this sum as image quality parameter.If adopt the third mode, processing unit 13 can be using the standard deviation of all pixel values of this filtering image as image quality parameter.
No matter which kind of mode described in employing leading portion, in the time that image quality parameter is larger, even if represent to adopt less comparison resource block size to compare image 104 and image 102, still can easily compare correct position.Contrary, when image quality parameter more hour, represent to adopt larger comparison resource block size compare image 104 and image 102, can improve the possibility of comparison to tram.Therefore, the content that corresponding table 100 is recorded is that larger image quality parameter corresponds to less comparison resource block size, but less image quality parameter corresponds to larger comparison resource block size.
Similar with the first embodiment, storage element 17 stores a corresponding table 100, and it records the corresponding comparison resource block size of different images Q factor.Processing unit 104 calculates after image quality parameter, just decides the size of comparison resource block size by inquiring about corresponding table 100.Must expositor, while calculating in different ways image quality parameter, the content of the corresponding table 100 of the corresponding use of institute can be different, to suitably reflect image quality parameter and compare the relation between resource block size.
From above stated specification, the second embodiment utilizes the filtering image of image 104 to calculate image quality parameter, and determines according to this suitable comparison resource block size.Therefore, by configuration and the technology of the second embodiment, optical navigator 1 can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
The third embodiment of the present invention is an optical navigator 2, and its schematic diagram is depicted in Fig. 2 A.Optical navigator 2 comprises a light source component 11, a processing unit 13 and an Image Sensor 15, and processing unit 13 is electrically connected to light source component 11 and Image Sensor 15.The running that light source component 11, processing unit 13 and Image Sensor 15 carry out in the 3rd embodiment is similar to the running of carrying out in first and second embodiment, therefore be only elaborated for the two different locating below.
In the present embodiment, in the time of light source projects to reflecting surface, Image Sensor 15 is sequentially in time point t3, t4, t5 pick-up image 202,204,206 respectively, as Fig. 2 B describes.Below narration will describe with time point t3, t4, t5 and image 202,204,206, but those skilled in the art should expect that optical navigator 2 can adopt identical technological means to process the image that Image Sensor 15 captures in other times point easily.
In brief, after Image Sensor 15 pick-up images 204, processing unit 13 can calculate an image quality parameter relevant to image 204, then determines the resource block size of comparing between image 204 and image 206 according to this image quality parameter.Afterwards, processing unit 13 is again according to this comparison resource block size, comparison image 204 and image 206, and the displacement in the time interval that calculating optical guider 2 defines at time point t4, t5 by this, and then reach the effect of navigation.
The present embodiment is hereby first described in detail in detail and how calculates the image quality parameter relevant to image 204.Particularly, the previously determined comparison resource block size of processing unit 13 meeting foundations (that is, between image 202 and image 204, compare resource block size, hereby suppose its long and wide 8 pixels that are all), comparison image 202 and image 204, so that the displacement in the time interval that calculating optical guider 2 defines at time point t3, t4.In the time of comparison image 202 and image 204, processing unit 13 can for example, in a search area (: long and wide is respectively the search area of 5 pixels), calculate multiple correlations (correlation value) Cor_0 ~ Cor_24 between image 202 and image 204, as Fig. 2 C describes.Each correlation Cor_0 ~ Cor_24 represents between image 202 and image 204 in the time of different displacement, the degree of correlation between its sub-image (its size is comparison resource block size, that is long and wide 8 pixels that are all).For example, correlation Col_12 represents that the displacement between image 202 and image 204 is at 0 o'clock, the degree of correlation between its sub-image.For example, the mode of calculating correlation according to some, when correlation is larger, represents between sub-image more similar.Again, according to some, other calculate the mode of correlation, when correlation is less, represent between sub-image more similar.Must expositor, how to calculate the technology that the correlation Cor_0 ~ Cor_24 between image 202 and image 204 is well known to those skilled in the art, therefore superfluous words not.
Then, processing unit 13 can, according to correlation Cor_0 ~ Cor_24, determine the image quality parameter relevant to image 204.For convenience of follow-up explanation, hereby first explanation when correlation Cor_0 ~ Cor_24 larger, more similar situation between sub-image.The present embodiment provides the multiple mode of calculating image quality parameter according to correlation Cor_0 ~ Cor_24, can select a use.
In first kind of way, processing unit 13 is chosen maximal value in correlation Cor_0 ~ Cor_24 as image quality parameter.In the second way, processing unit 13 is first chosen the maximal value (for example: correlation Cor_8) in correlation Cor_0 ~ Cor_24, calculate again its mean value of eight correlation Cor_2, Cor_3, Cor_4, Cor_7, Cor_9, Cor_12, Cor_13, Cor_14 around, after again maximal value and mean value being subtracted each other, take absolute value, and be worth as image quality parameter using this.In the third mode, correlation Cor_0 ~ Cor_24 must be all nonnegative number.Processing unit 13 is first chosen the maximal value in correlation Cor_0 ~ Cor_24, then calculates its mean value of eight correlations around, then using maximal value divided by mean value as image quality parameter.If mean value is 0, processing unit 13 is using a preset upper limit value as image quality parameter, and this situation represents that image quality is very good.
In the 4th kind of mode, processing unit 13 is first chosen the maximal value (for example: correlation Cor_8) in correlation Cor_0 ~ Cor_24, again in getting rid of this maximal value and eight correlation Cor_2 around thereof, Cor_3, Cor_4, Cor_7, Cor_9, Cor_12, Cor_13, remaining correlation Cor_0 after Cor_14, Cor_1, Cor_5, Cor_6, Cor_10, Cor_11, in Cor_15 ~ Cor_24, choose another maximal value (for example: correlation Cor_21), after again maximal value and another maximal value being subtracted each other, take absolute value, and be worth as image quality parameter using this.In the 5th kind of mode, correlation Cor_0 ~ Cor_24 must be all nonnegative number.Processing unit 13 is first chosen the maximal value in correlation Cor_0 ~ Cor_24, then in getting rid of this maximal value and choosing another maximal value in remaining correlation after eight correlations around, then by maximal value divided by another maximal value using as image quality parameter.If another maximal value is 0, processing unit 13 is using a preset upper limit value as image quality parameter, and this situation represents that image quality is very good.In the 6th kind of mode, processing unit 13 can be chosen the maximal value in correlation Cor_0 ~ Cor_24, also can choose the maximal value in the correlation of previous stage, then the maximal value in this stage be deducted to the maximal value of previous stage, and be worth as image quality parameter using this.
If adopt aforementioned first to the 6th kind of mode to determine image quality parameter, in the time that image quality parameter is larger, represent that the quality of image 204 is better, therefore be more credible in the comparison result at this place.If adopt aforementioned the 6th kind of mode, when image quality parameter is larger, represent the inferior quality of image 204, therefore more insincere in the comparison result at this place.
If previously calculated the technology that correlation Cor_0 ~ Cor_24 uses, be to make correlation Cor_0 ~ Cor_24 less, more similar between sub-image, according to aforementioned first to the 6th kind of mode while determining image quality parameter, get maximal value place and need change into and get minimum value.Now, if adopt aforementioned first, the 3rd, the 5th and the 6th kind of mode determine image quality parameter, when image quality parameter more hour, represent that the quality of image 204 is better, thus in the comparison result at this place more for credible.If adopt aforementioned the 6th kind of mode, when image quality parameter is less, represent the inferior quality of image 204, therefore more insincere in the comparison result at this place.
The present embodiment is then described in detail in detail and how decides according to image quality parameter the comparison resource block size that next stage will use.Hereby first to represent that when image quality parameter is larger the better situation of image 204 qualities is illustrated.The present embodiment provides multiple different adjustment mode to decide/adjust the size of comparison resource block size.
In the first adjustment mode, processing unit 13 can be set one first threshold value and one second threshold values, and image quality parameter and the first threshold value and/or the second threshold value are compared, and wherein the first threshold value is higher than the second threshold value.In the time that processing unit 13 judges that image quality parameter is greater than the first threshold value, will downgrade comparison resource block size.This situation represents that the comparison resource block size using has at present been enough to make two sub-images to be compared accurately, therefore can downgrade comparison area piece size, to promote the efficiency of comparison.In the time that processing unit 13 judges that image quality parameter is between between the first threshold value and the second threshold value, will not adjust comparison area piece size.This situation represents that it is general acceptable state that the comparison resource block size using at present by chance makes the comparison result between two sub-images, does not therefore adjust comparison area piece size.In the time that processing unit 13 judges that image quality parameter is less than the second threshold value, will increase comparison resource block size.This situation represents that the comparison block undergage using is at present so that two sub-images can, by correct comparison, therefore can increase comparison area piece size, to reach good comparison result.
It is to adjust mode based on the first that the second is adjusted mode, then adds further the bound judgement of comparing resource block size.Particularly, in the time that processing unit 13 judges that image quality parameter is greater than the first threshold value, can judge further more whether comparison resource block size is greater than one the 3rd threshold value (for example: long and wide 4 pixels that are all).This 3rd threshold value can be considered the lower limit of comparison resource block size.If comparison resource block size is greater than the 3rd threshold value, processing unit 13 sides can downgrade comparison resource block size, are unrestrictedly downgraded to avoid comparing resource block size.In like manner, in the time that processing unit 13 judges that image quality parameter is less than the second threshold value, can judge further more whether comparison resource block size is less than one the 4th threshold value (for example: long and wide 16 pixels that are all).This 4th threshold value can be considered the upper limit of comparison resource block size.If comparison resource block size is less than the 4th threshold value, processing unit 13 sides can increase comparison resource block size, are unrestrictedly increased to avoid comparing resource block size, expend too much calculation resources.
The third adjustment mode is also to adjust mode based on the first, but adds further the judgement that downgrades assessment number of times and increase assessment number of times again.Downgrade assessment number of times and represent that having continuously several images to be judged as need to increase comparison resource block size, its preset value is 0; Increase assessment number of times and represented that continuously several images are judged as and need to downgrade comparison resource block size, its preset value is also 0.Particularly, in the time that processing unit 13 judges that image quality parameter is greater than the first threshold value, can first increase progressively and downgrade assessment number of times, then judge that further this downgrades assessment number of times and whether is greater than one the 5th threshold value.If this downgrade assessment number of times be greater than the 5th threshold value, representative really need to downgrade comparison resource block size, processing unit 13 sides can downgrade comparison resource block size, then will downgrade assess number of times make zero.In like manner, in the time that processing unit 13 judges that image quality parameter is less than the second threshold value, can first increase progressively and increase assessment number of times, then judge that further this increases assessment number of times and whether is greater than one the 6th threshold value.If this increase assessment number of times be greater than the 6th threshold value, representative really need to increase comparison resource block size, processing unit 13 sides can increase comparison resource block size, then will increase assess number of times make zero.
Adjust in the operating mechanism of mode at the third, if downgrade comparison resource block size continuous judged result be interrupted (that is, first aforementioned image is judged and will downgrades comparison resource block size, but at present image be judged needn't downgrade comparison resource block size), downgrading assessment number of times can be made zero.Similarly, be interrupted if increase the continuous judged result of comparison resource block size, increase assessment number of times and also can be made zero.By the third method of adjustment, in the time having continuously multiple images to be judged as need to increase (or downgrading) comparison resource block size, processing unit 13 sides can increase (or downgrading) comparison resource block size, to avoid erroneous judgement and/or to adjust too continually comparison resource block size.
The 4th kind of adjustment mode is to integrate aforementioned second and third kind of adjustment mode; In other words, meet three Rule of judgment simultaneously and just can increase or downgrade comparison resource block size.Particularly, in the time that processing unit 13 judges that image quality parameter is greater than the first threshold value, can judge further again comparison resource block size whether be greater than the 3rd threshold value (that is, compare the lower limit of resource block size).In the time that comparison resource block size is greater than the 3rd threshold value, processing unit 13 judges whether downgrade assessment number of times is greater than the 5th threshold value further.If this downgrade assessment number of times be greater than the 5th threshold value, representative really need to downgrade comparison resource block size, processing unit 13 sides can downgrade comparison resource block size, then will downgrade assess number of times make zero.Aforementionedly judge whether comparison resource block size is greater than the 3rd threshold value and judgement and downgrades the execution sequence whether assessment number of times be greater than the 5th threshold value and can be exchanged.
Similarly, in the time that processing unit 13 judges that image quality parameter is less than the second threshold value, can judge further again comparison resource block size whether be less than the 4th threshold value (that is, compare the upper limit of resource block size).In the time that comparison resource block size is less than the 4th threshold value, processing unit 13 judges whether increase assessment number of times is greater than the 6th threshold value further.If this increase assessment number of times be greater than the 6th threshold value, representative really need to increase comparison resource block size, processing unit 13 sides can increase comparison resource block size, then will increase assess number of times make zero.Aforementionedly judge whether comparison resource block size is less than the 4th threshold value and judgement and increases the execution sequence whether assessment number of times be greater than the 6th threshold value and can be exchanged.
As previously mentioned, under some situation, represent that when image quality parameter is less image 204 qualities are better.Hereby be illustrated under this kind of situation, how decide according to image quality parameter the comparison resource block size that next stage will use.Particularly, processing unit 13 is to change a little aforementioned first to the third adjustment mode, in the time that processing unit 13 judges that image quality parameter is greater than the first threshold value, change into and increase comparison resource block size, and in the time that processing unit 13 judges that image quality parameter is less than the second threshold value, change into and downgrade comparison resource block size.Those skilled in the art should adjust the narrating content of mode to the third based on aforementioned first, it are changed into and are applicable to when the less better situation of image 204 qualities that represents of image quality parameter, hereby superfluous words not.
Follow-up, after Image Sensor 15 pick-up images 206, processing unit 13 just can be according to the comparison resource block size being determined by image 202,204, comparison image 204 and image 206, a displacement in the time interval that calculating optical guider 2 defines at time point t4, t5 by this, and then reach the effect of navigation.
From above stated specification, the 3rd embodiment utilizes the correlation that produces of comparison image to calculate image quality parameter at 202,204 o'clock, then the comparison resource block size using while determining according to this next stage comparison (that is, comparison image 204,206).By configuration and the technology of the 3rd embodiment, optical navigator 2 can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
About the fourth embodiment of the present invention, refer to Fig. 2 A and Fig. 3.Why the Main Differences of the 4th embodiment and the 3rd embodiment is adopted image quality parameter.
In the present embodiment, in the time of light source projects to reflecting surface, Image Sensor 15 is sequentially in time point t6, t7, t8, t9, t10 pick-up image 301,302,303,304,305 respectively, as Fig. 3 describes.After Image Sensor 15 pick-up images 304, processing unit 13 can calculate an image quality parameter relevant to image 304, then determines the resource block size of comparing between image 304 and image 305 according to this image quality parameter.
Hereby suppose that processing unit 13 has calculated optical navigator 2 in the displacement between time point t6, t7, in the displacement between time point t7, t8 and the displacement between time point t8, t9.The present embodiment provides the multiple mode of calculating image quality parameter according to aforementioned displacements amount, can select a use, is described below.
In first kind of way, processing unit 13 calculating optical guiders 2 are in the displacement between time point t6, t7, in a mean value of the displacement between time point t7, t8 and the displacement between time point t8, t9, and image quality parameter using this mean value as image 305.In the second way, 13 of processing units directly using optical navigator 2 displacement between time point t7, t8 as the image quality parameter of image 305.In the second way, the displacement of processing unit 13 reference optical guiders 2 between time point t7, t8, gets the linear combination value of its x axle component and y axle component as the image quality parameter of image 305.
The image quality parameter that adopts aforementioned manner to determine, in the time that image quality parameter value is larger, the speed that expression optical navigator 2 is moved is faster.In the time that translational speed is faster, need less comparison resource block size, larger displacement can be detected.Contrary, when image quality parameter value more hour, represent that the speed that optical navigator 2 is moved is slower.In the time that translational speed is slower, adopts larger comparison resource block size can detect the change of its displacement, and have good comparison quality.Processing unit 13 just can be according to the adjustment mode described in the 3rd embodiment, determines the resource block size of comparing between image 304 and image 305.Follow-up, after Image Sensor 15 pick-up images 305, processing unit 13 just can be according to the comparison resource block size being determined by image 304,305, comparison image 304 and image 305, a displacement in the time interval that calculating optical guider 2 defines at time point t9, t10 by this, and then reach the effect of navigation.
From above stated specification, the 4th embodiment utilizes the displacement between different images to calculate image quality parameter, then the comparison resource block size using while determining according to this next stage comparison (that is, comparison image 304,305).By configuration and the technology of the 4th embodiment, optical navigator 2 can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
The fifth embodiment of the present invention is a kind of optical navigation method, and its process flow diagram is depicted in Fig. 4.This optical navigation method is applicable to an optical navigator, the optical navigator 1 of for example first and second embodiment.This optical navigator comprises a light source component, an Image Sensor and a processing unit.
First, optical navigation method execution step S41, in light source component during by light source projects to reflecting surface, by Image Sensor in very first time point acquisition one first image.Then, in step S43, in light source component by light source projects during to reflecting surface, by Image Sensor in one second time point acquisition one second image.Must expositor, the very first time is o'clock early than the second time point.
In step S45, processing unit calculates the image quality parameter with second correction of image.Implement in aspect in some, step S45 is the brightness fluctuation degree (for example: the standard deviation of the brightness value of all pixels in the second image) of being calculated the second image by processing unit, and using this brightness fluctuation degree as image quality parameter.And for example, in, some implements in aspect other, step S45 be by processing unit by the second images filter with a filtering image, then calculate image quality parameter according to filtering eiconometer.
In step S47, determine the resource block size of comparing between the first image and the second image by processing unit according to image quality parameter.For example, step S47 can be shown so that image quality parameter query one is corresponding by processing unit, and sets comparison resource block size with the result of inquiry.Afterwards, in step S49, by processing unit utilization comparison resource block size, by comparing the first image and the second image, a displacement of calculating optical guider.
Except aforesaid step, the 5th embodiment also can carry out all works and the function of first and second embodiment.Those skilled in the art can be directly acquainted with the 5th embodiment how based on above-mentioned first and second embodiment to carry out these operations and function, therefore do not repeat.
The sixth embodiment of the present invention is a kind of optical navigation method, and its main process flow diagram is depicted in Fig. 5 A.This optical navigation method is applicable to an optical navigator, and for example the 3rd and the optical navigator 2 of the 4th embodiment.This optical navigator comprises a light source component, an Image Sensor and a processing unit.
First, optical navigation method execution step S51, in light source component during by light source projects to reflecting surface, by Image Sensor in very first time point acquisition one first image.Then, in step S52, in light source component by light source projects during to reflecting surface, by Image Sensor in one second time point acquisition one second image.Must expositor, the very first time is o'clock early than the second time point.
In step S53, processing unit calculates the image quality parameter with second correction of image.Implement in aspect in some, step S53 calculates the multiple correlations between the first image and the second image by processing unit according to a comparison resource block size, then decides image quality parameter according to these correlations.And for example, in, some implements in aspect other, step S53 calculates the multiple correlations between the first image and the second image by processing unit according to a comparison resource block size, determine the displacement between the first image and the second image according to these correlations again, then go out image quality parameter according to this displacement calculation.
In the present embodiment, suppose in the time that image quality parameter value is larger, represent that image quality is better.Then,, in step S54, determine the resource block size of comparing between the second image and one the 3rd image by processing unit according to image quality parameter.Afterwards, in step S55, in light source component, by light source projects during to reflecting surface, by Image Sensor, in one the 3rd time point acquisition the 3rd image, wherein the 3rd time point is later than the second time point.Finally, in step S56, by processing unit utilization comparison resource block size, by comparing the second image and the 3rd image, the displacement of calculating optical guider.
Palpus expositor, the 5th embodiment provides three kinds of different modes to carry out abovementioned steps S54, is depicted in respectively Fig. 5 B, Fig. 5 C and Fig. 5 D, can select a use.
In the mode of describing in Fig. 5 B, optical navigator first performs step S501, judges whether image quality parameter is greater than one first threshold value.This step can be regarded as and judges that whether image quality is higher than a default high standard.If so, perform step S502 to downgrade comparison resource block size, perform step again afterwards S55.Be not more than one first threshold value if the judged result of step S501 is image quality parameter, then perform step S503, judge whether image quality parameter is less than one second threshold value.Step S503 can be regarded as and judges that whether image quality is lower than a default low mark.If the judged result of step S503 is yes, perform step S504 to increase comparison resource block size, perform step again afterwards S55.If the judged result of step S503 is no, directly perform step S55.
In the mode of describing in Fig. 5 C, optical navigator first performs step S501, judges whether image quality parameter is greater than one first threshold value.If so, then perform step S515, judge whether comparison resource block size is greater than one the 3rd threshold value.Step S515 can be regarded as and judges whether comparison resource block size is still greater than a resource block size lower limit.If the judged result of step S515 is yes, side execution step S502, to downgrade comparison resource block size, performs step S55 afterwards again.If the judged result of step S515 is no, directly perform step S55.On the other hand, if the result of step S501 is no, then perform step S503, to judge whether image quality parameter is less than one second threshold value.If the judged result of step S503 is no, directly perform step S55.If the judged result of step S503 is yes, perform step further again S516 to judge whether comparison resource block size is less than one the 4th threshold value.Step S516 can be regarded as and judges whether comparison resource block size is still less than a resource block size upper limit.If the judged result of step S516 is yes, side can perform step S504 to increase comparison resource block size, performs step afterwards S55 again.If the judged result of step S516 is no, directly perform step S55.
In the mode of describing in Fig. 5 D, optical navigator first performs step S501, judges whether image quality parameter is greater than one first threshold value.If so, first perform step S527 and downgrade assessment number of times to increase progressively one, and will increase assessment number of times and make zero, then perform step S525 and downgrade number of times and whether be greater than one the 5th threshold value with judgement.Step S525 can be regarded as continuous judgement need to downgrade comparison resource block size number of times whether reach according to preassigned.If the judged result of step S525 is yes, execution step S502 in side to be to downgrade comparison resource block size, then performs step S528 and will downgrade and assess number of times and make zero, and performs step afterwards S55 again.If the judged result of step S525 is no, directly perform step S55.
On the other hand, if the result of step S501 is no, then perform step S503, to judge whether image quality parameter is less than one second threshold value.If the judged result of step S503 is no, first perform step S529 and will downgrade assessment number of times and and increase assessment number of times and make zero, then perform step S55.If the judged result of step S503 is yes, first perform step S530 and increase assessment number of times to increase progressively, and will downgrade assessment number of times make zero.Afterwards, perform step further S526 to judge whether increase number of times is greater than one the 5th threshold value.Step S526 can be regarded as continuous judgement need to increase comparison resource block size number of times whether reach according to preassigned.If the judged result of step S526 is yes, side can perform step S504 to increase comparison resource block size, then perform step S532 will downgrade assess number of times make zero, perform step again afterwards S55.If the judged result of step S526 is no, directly perform step S55.
Other are implemented the flow process that aspects also can illustrate in conjunction with Fig. 5 C and Fig. 5 D and realize abovementioned steps S54.Particularly, this kind determines step S501, S503, S515 and the S516 of the mode meeting execution graph 5C of comparison resource block size.But, when the judged result of step S515 is when being, can follow the step S527 of execution graph 5D.Similarly, when the judged result of step S516 is when being, can follow the step S530 of execution graph 5D.
Except aforesaid step, the 6th embodiment also can carry out all works and the function of the 3rd and the 4th embodiment.Those skilled in the art can be directly acquainted with the 6th embodiment how based on the above-mentioned the 3rd and the 4th embodiment to carry out these operations and function, therefore do not repeat.
Moreover the described optical navigation method of the 5th and the 6th embodiment can be realized by a computer program product.When an optical navigator is written into this computer program product, and carry out after multiple instructions that this computer program product comprises, can complete the described optical navigation method of the 5th and the 6th embodiment.Aforesaid computer program product can be and can by the file of transmission over networks, also can be stored in computer-readable recording medium for example ROM (read-only memory) (read only memory; ROM), flash memory, floppy disk, hard disk, CD, USB flash disk, tape, can expect easily and have in any other Storage Media of identical function by the database of network access or those skilled in the art.
From the explanation of aforementioned each embodiment, the present invention can be according to the various different information of image, calculates image quality parameter, then the comparison resource block size using while determining follow-up comparing according to image quality parameter.In the time that the quality of image is better, preferably compare effect because can obtain, therefore adopt less comparison resource block size, can carry out in more efficient mode with the comparison between image.In the time of the inferior quality of image, adopt larger comparison resource block size, to maintain the comparison result of certain quality.Accordingly, optical navigator provided by the present invention and optical navigation method can not only carry out the comparison between image in efficient mode, and good comparison result also can be provided.
The above embodiments are only used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not used for limiting protection category of the present invention.Any those skilled in the art can unlabored change or the arrangement of isotropism all belong to the scope that the present invention advocates, the scope of the present invention should be as the criterion with claim scope.
Claims (32)
1. an optical navigator, is characterized in that, comprises:
One light source component, in order to produce a light source;
One Image Sensor, in the time of described light source projects to reflecting surface, in very first time point acquisition one first image; And
One processing unit, is electrically connected to described Image Sensor, and an image quality parameter of calculating and described first correction of image, and determines that according to described image quality parameter one first between described the first image and one second image compare resource block size.
2. optical navigator as claimed in claim 1, is characterized in that, described processing unit more judges that described image quality parameter is greater than a threshold value, and downgrades described the first comparison resource block size according to described judged result.
3. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is greater than one first threshold value, then judges that described the first comparison resource block size is greater than one second threshold value, then downgrades described the first comparison resource block size.
4. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is greater than one first threshold value, more increase progressively one and downgrade assessment number of times, described in judgement, downgrade again assessment number of times and be greater than one second threshold value, then downgrade described the first comparison resource block size.
5. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is greater than one first threshold value, judge that more described the first comparison resource block size is greater than one second threshold value, increase progressively again one and downgrade assessment number of times, described in judgement, downgrade again assessment number of times and be greater than one the 3rd threshold value, then downgrade described the first comparison resource block size.
6. optical navigator as claimed in claim 1, is characterized in that, described processing unit more judges that described image quality parameter is less than a threshold value, and increases described the first comparison resource block size according to described judged result.
7. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is less than one first threshold value, then judges that described the first comparison resource block size is less than one second threshold value, then increases described the first comparison resource block size.
8. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is less than one first threshold value, more increase progressively one and increase assessment number of times, described in judgement, increase again assessment number of times and be greater than one second threshold value, then increase described the first comparison resource block size.
9. optical navigator as claimed in claim 1, it is characterized in that, described processing unit more judges that described image quality parameter is less than one first threshold value, judge that more described the first comparison resource block size is less than one second threshold value, increase progressively again one and increase assessment number of times, described in judgement, increase again assessment number of times and be greater than one the 3rd threshold value, then increase described the first comparison resource block size.
10. optical navigator as claimed in claim 1, is characterized in that, more comprises:
One storage element, stores a corresponding table;
Wherein, described processing unit determines described the first comparison resource block size with corresponding table described in described image quality parameter query.
11. optical navigators as claimed in claim 1, it is characterized in that, when described light source projects is when the described reflecting surface, described Image Sensor more captures described the second image in one second time point, described the second time point is early than described very first time point, and described image quality parameter is relevant to a brightness fluctuation degree of described the first image.
12. optical navigators as claimed in claim 1, it is characterized in that, when described light source projects is when the described reflecting surface, described Image Sensor more captures described the second image in one second time point, described the second time point is early than described very first time point, described processing unit more by described the first images filter with a filtering image, and the described filtering correction of image of described image quality parameter and described the first image.
13. optical navigators as described in claim 11 or 12, is characterized in that, described processing unit more utilizes described the first comparison resource block size, by comparing described the first image and described the second image, calculates a displacement of described optical navigator.
14. optical navigators as claimed in claim 1, it is characterized in that, when described light source projects is when the described reflecting surface, described Image Sensor more captures described the second image and captures one the 3rd image in one the 3rd time point in one second time point, described the second time point is later than described very first time point, described the 3rd time point is early than described very first time point, described processing unit calculates the multiple correlations between described the first image and described the 3rd image according to one second comparison resource block size, described processing unit determines described image quality parameter according to described correlation, and described processing unit more utilizes described the first comparison resource block size, by comparing described the first image and described the second image, calculate a displacement of described optical navigator.
15. optical navigators as claimed in claim 1, it is characterized in that, when described light source projects is when the described reflecting surface, described Image Sensor more captures described the second image and captures one the 3rd image in one the 3rd time point in one second time point, described the second time point is later than described very first time point, described the 3rd time point is early than described very first time point, described processing unit calculates one first displacement between described the first image and described the 3rd image according to one second comparison resource block size, described processing unit determines described image quality parameter according to described the first displacement, and described processing unit more utilizes described the first comparison resource block size, by comparing described the first image and described the second image, calculate one second displacement of described optical navigator.
16. 1 kinds of optical navigation methods, is characterized in that, are applicable to an optical navigator, and described optical navigator comprises a light source component, an Image Sensor and a processing unit, and described optical navigation method comprises the following step:
In described light source component during by light source projects to reflecting surface, by described Image Sensor in very first time point acquisition one first image;
An image quality parameter by described processing unit calculating with described first correction of image; And
Determine that according to described image quality parameter one first between described the first image and one second image compare resource block size.
17. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is greater than a threshold value; And
Downgrade described the first comparison resource block size by described processing unit according to described judged result.
18. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is greater than one first threshold value;
Judge that by described processing unit described the first comparison resource block size is greater than one second threshold value; And
Downgrade described the first comparison resource block size by described processing unit.
19. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is greater than one first threshold value;
Increase progressively one by described processing unit and downgrade assessment number of times;
Be greater than one second threshold value by downgrading assessment number of times described in described processing unit judgement; And
Downgrade described the first comparison resource block size by described processing unit.
20. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is greater than one first threshold value;
Judge that by described processing unit described the first comparison resource block size is greater than one second threshold value;
Increase progressively one by described processing unit and downgrade assessment number of times;
Be greater than one the 3rd threshold value by downgrading assessment number of times described in described processing unit judgement; And
Downgrade described the first comparison resource block size by described processing unit.
21. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is less than a threshold value; And
Increase described the first comparison resource block size by described processing unit according to described judged result.
22. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is less than one first threshold value;
Judge that by described processing unit described the first comparison resource block size is less than one second threshold value; And
Increase described the first comparison resource block size by described processing unit.
23. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is less than one first threshold value;
Increase progressively one by described processing unit and increase assessment number of times;
Be greater than one second threshold value by increasing assessment number of times described in described processing unit judgement; And
Increase described the first comparison resource block size by described processing unit.
24. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Judge that by described processing unit described image quality parameter is less than one first threshold value;
Judge that by described processing unit described the first comparison resource block size is less than one second threshold value;
Increase progressively one by described processing unit and increase assessment number of times;
Be greater than one the 3rd threshold value by increasing assessment number of times described in described processing unit judgement; And
Increase described the first comparison resource block size by described processing unit.
25. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
Determine described the first comparison resource block size by described processing unit with the corresponding table of described image quality parameter query one.
26. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
When described light source projects is when the described reflecting surface, capture described the second image by described Image Sensor in one second time point, wherein said the second time point is early than described very first time point;
Wherein, described image quality parameter is relevant to a brightness fluctuation degree of described the first image.
27. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
When described light source projects is when the described reflecting surface, capture described the second image by described Image Sensor in one second time point, wherein said the second time point is early than described very first time point; And
By described processing unit by described the first images filter with a filtering image;
Wherein, the described filtering correction of image of described image quality parameter and described the first image.
28. optical navigation methods as described in claim 26 or 27, is characterized in that, more comprise the following step:
Utilize described the first comparison resource block size by described processing unit, by comparing described the first image and described the second image, calculate a displacement of described optical navigator.
29. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
When described light source projects is when the described reflecting surface, capture described the second image by described Image Sensor in one second time point, wherein said the second time point is later than described very first time point; And
When described light source projects is when the described reflecting surface, by described Image Sensor, in one the 3rd time point acquisition one the 3rd image, wherein said the 3rd time point is early than described very first time point;
Wherein, the step of calculating described image quality parameter comprises the following step:
Calculate the multiple correlations between described the first image and described the 3rd image by described processing unit according to one second comparison resource block size; And
Determine described image quality parameter by described processing unit according to described correlation.
30. optical navigation methods as claimed in claim 29, is characterized in that, more comprise the following step:
Utilize described the first comparison resource block size by described processing unit, by comparing described the first image and described the second image, calculate a displacement of described optical navigator.
31. optical navigation methods as claimed in claim 16, is characterized in that, more comprise the following step:
When described light source projects is when the described reflecting surface, capture described the second image by described Image Sensor in one second time point, wherein said the second time point is later than described very first time point; And
When described light source projects is when the described reflecting surface, by described Image Sensor, in one the 3rd time point acquisition one the 3rd image, wherein said the 3rd time point is early than described very first time point;
Wherein, the step of calculating described image quality parameter comprises the following step:
Calculate one first displacement between described the first image and described the 3rd image by described processing unit according to one second comparison resource block size; And
Determine described image quality parameter by described processing unit according to described the first displacement.
32. optical navigation methods as claimed in claim 31, is characterized in that, more comprise the following step:
Utilize described the first comparison resource block size by described processing unit, by comparing described the first image and described the second image, calculate one second displacement of described optical navigator.
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