CN104008522A - Self-adaptation current regulation and control method in photoelectric navigation device - Google Patents
Self-adaptation current regulation and control method in photoelectric navigation device Download PDFInfo
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- CN104008522A CN104008522A CN201410266211.XA CN201410266211A CN104008522A CN 104008522 A CN104008522 A CN 104008522A CN 201410266211 A CN201410266211 A CN 201410266211A CN 104008522 A CN104008522 A CN 104008522A
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Abstract
The invention relates to a self-adaptation current regulation and control method in a photoelectric navigation device. The self-adaptation current regulation and control method comprises the following steps that first, a DSP processing module controls a pixel array to collect images, a digital image is obtained after AD sampling, and the DSP processing module judges the image quality of the digital image; second, the DSP processing module compares the image quality of the digital image with a preset image quality threshold, and when the image quality of the digital image is not matched with the preset image quality threshold, the DSP processing module regulates a working current value of a reading circuit or a programmable gain amplifier or an analog-digital conversion module through a current control module to made the image quality of the digital image be matched with the preset image quality threshold, wherein the digital image is processed through AD sampling and then transmitted to the DSP processing module. The self-adaptation current regulation and control method in the photoelectric navigation device is convenient to operate, the quality of images can be regulated in an adaptive mode, positioning accuracy is improved, power consumption is reduced, the cruising ability of a mobile device is improved, and the method is wide in application range, safe and reliable.
Description
Technical field
The present invention relates to a kind of regulate and control method, self-adaptive current regulate and control method in especially a kind of optical navigation equipment, belongs to the technical field that optical navigation regulates and controls.
Background technology
The capturing images of the device such as optical imagery pointing device and optical video equipment, as wireless optical mouse, optical navigation device etc.This kind equipment all needs to feed back acquisition image series by illumination, then image is processed and provided motion vector.Owing to having used portable power source, in order to extend single, use duration, need to carry out power consumption control processing.
As shown in Figure 1, block diagram for existing conventional capturing images system, DSP processing module is controlled exposure, then turn-on data passage: the data in pel array output to sensing circuit, after view data being amplified through programmable gain amplifier, carry out digital-to-analog conversion, finally obtain digital signal.Whole process is referred to as AD sampling, after AD has sampled, just can obtain digital picture that a frame is complete.
DSP processing module is carried out image processing to the image collecting, and calculates motion vector, to realize optical navigation.In the specific implementation, the working current in sensing circuit, programmable gain amplifier and analog-to-digital conversion module is a fixed value, and described fixing working current is set according to characteristics of signals and/or sample frequency.When running into different external environment conditions, the image quality transferring to after AD sampling in DSP processing module also can be different, and the image of different qualities can affect the positioning precision of DSP processing module, or can increase the power consumption of whole picture system.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, self-adaptive current regulate and control method in a kind of optical navigation equipment is provided, it is easy to operate, energy self-adaptation is adjusted the quality of image, improve the precision of location, reduce power consumption, the flying power of lifting mobile equipment, wide accommodation, safe and reliable.
According to technical scheme provided by the invention, self-adaptive current regulate and control method in described optical navigation equipment, comprises DSP processing module and the pel array, the analog-to-digital conversion module that are connected with described DSP processing module; Pel array is connected with analog-to-digital conversion module by sensing circuit, programmable gain amplifier; In described DSP processing module, current control module is set, DSP processing module is connected with sensing circuit, programmable gain amplifier and analog-to-digital conversion module respectively by current control module; Described self-adaptive current regulate and control method comprises the steps:
A, DSP processing module are controlled pel array and are gathered image, and obtain digital picture after AD sampling, and DSP processing module judges the image quality of described digital picture;
B, DSP processing module are by the image quality of described digital picture and the comparison of default image quality threshold value, when the image quality of described digital picture does not mate with default image quality threshold value, DSP processing module is adjusted the working current value in sensing circuit, programmable gain amplifier or analog-to-digital conversion module by current control module, so that transfer to image quality and the default image quality threshold value of the digital picture in DSP processing module after AD sampling, matches.
The working current form that described current control module is adjusted in sensing circuit, programmable gain amplifier or analog-to-digital conversion module is increase electric current or reduce electric current.
The advantage that the present invention compared with prior art had or good effect:
1, current-mode more flexibly, runs into severe external environment condition (illumination condition, background contrasts etc.), can promote the quality of image by increasing the mode of electric current, thereby location is more accurately provided.And prior art has been solidified size of current, even if when image quality is extremely low, also cannot reach the object that promotes image quality by adjusting electric current.
When 2, guaranteeing positioning precision, greatly reduced the power consumption of navigator.When external environment condition is more excellent, guarantee, under the prerequisite of image quality, can lower electric current.Likely under extremely low current-mode, the image quality that also can provide.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of conventional images acquisition.
Fig. 2 is structured flowchart of the present invention.
Fig. 3 is a kind of implementing procedure figure of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 2: the quality for energy self-adaptation adjustment image, improve the precision of location, reduce power consumption, the flying power of lifting mobile equipment, comprises DSP processing module and the pel array, the analog-to-digital conversion module that are connected with described DSP processing module; Pel array is connected with analog-to-digital conversion module by sensing circuit, programmable gain amplifier; In described DSP processing module, current control module is set, DSP processing module is connected with sensing circuit, programmable gain amplifier and analog-to-digital conversion module respectively by current control module; Described self-adaptive current regulate and control method comprises the steps:
A, DSP processing module are controlled pel array and are gathered image, and obtain digital picture after AD sampling, and DSP processing module judges the image quality of described digital picture;
B, DSP processing module are by the image quality of described digital picture and the comparison of default image quality threshold value, when the image quality of described digital picture does not mate with default image quality threshold value, DSP processing module is adjusted the working current value in sensing circuit, programmable gain amplifier or analog-to-digital conversion module by current control module, so that transfer to image quality and the default image quality threshold value of the digital picture in DSP processing module after AD sampling, matches.
Particularly, current control module is the part in DSP processing module, for to the reading and carry out corresponding adjusting and arrange of sensing circuit, programmable gain amplifier or analog-to-digital conversion module working current, analog-to-digital conversion module can be also a part for DSP processing module.Mimic channel has the concept of Time Created, and simulating signal is stablized the needed shortest time.Affect in the factor of Time Created, electric current is a very important parameter wherein; When electric current is larger, signal is set up more fully, otherwise signal shows as unstable.
From iconology angle, the higher random noise of unsettled signal correspondence, but different application is different to the requirement of image quality.For optical navigation equipment, image quality that might not demand optimum is to calculate movement locus, and the image quality that meets certain condition also can be realized precision navigation.
In the embodiment of the present invention, can be according to the requirement of the aspects such as environment for use of optical navigation equipment, in DSP processing module, store default image quality threshold value, described default image quality threshold value can make to enter the requirement that digital picture in DSP processing module can meet the aspects such as precision navigation.In sensing circuit, programmable gain amplifier or analog-to-digital conversion module, generally all there is configuration register, in sensing circuit, programmable gain amplifier or analog-to-digital conversion module, there are a plurality of working current values, the value of corresponding configuration register is set by current control module, can realizes the regulation and control to the working current value of sensing circuit, programmable gain amplifier or analog-to-digital conversion module.
When work, DSP processing module can control pixel array exposure and sampling starts, after the AD sampling of sensing circuit, programmable gain amplifier and analog-to-digital conversion module, can be by Digital Image Transmission to DSP processing module, DSP processing module can be carried out quality judgement to described digital picture, method to digital image quality judgement can adopt the conventional method of the art, repeats no more herein.After the quality judgement of digital picture, by the quality of described digital picture and the comparison of default image quality threshold value, sensing circuit, programmable gain amplifier and/or analog-to-digital conversion module are carried out to working current adjusting, until the digital picture transferring in DSP processing module after adjusting is mated with default image quality threshold value.In the embodiment of the present invention, digital picture quality is not mated and is referred to that digital picture quality is not identical with default image quality threshold value with default image quality threshold value, can not meet the interior request for utilization for digital picture of DSP processing module.In the specific implementation, default image quality threshold value can be selected according to specific requirement for a concrete numerical value or a numerical value interval, repeats no more herein.
In the specific implementation, the working current form in described current control module adjustment sensing circuit, programmable gain amplifier or analog-to-digital conversion module is for increasing electric current or reducing electric current.When the quality of digital picture is during higher than default image quality threshold value, current control module reduces the electric current of sensing circuit, programmable gain amplifier and/or analog-to-digital conversion module, when digital picture quality is during lower than default image quality threshold value, current control module increases the current value of read current, programmable gain amplifier and/or analog-to-digital conversion module.Can be for one of them or all adjust for the electric current adjustment in sensing circuit, programmable gain amplifier, analog-to-digital conversion module.For the electric current in sensing circuit, programmable gain amplifier, analog-to-digital conversion module, regulate ratio by current control module, to be arranged as required by DSP processing module, as long as meet the default image quality threshold value of Image-matching after AD sampling.
As shown in Figure 3, the image quality of take has level Four, and as example, the present invention is described further, wherein, and for being categorized as of image quality: Good, Normal, Bad and Very_Bad.If the quality of DSP processing module judgement digital picture is Very_Bad, current control module need to be the electric current of some or all modules fast lifting (increment is Δ 1) up.If the quality of DSP processing module judgement digital picture is Bad, need the electric current of some or all modules up to promote (increment is Δ 2).Wherein Δ 2≤Δ 1.If the quality of DSP processing module judgement digital picture is Normal, current control module is without adjusting electric current.If the quality of DSP processing module judgement digital picture is Good, current control module can reduce electric current (increment is Δ 3) so.In the present embodiment, when the quality of digital picture is Normal, the quality of representative digit image is mated with default image quality threshold value, and described Normal is default image quality threshold value.When digital quality is Good, the quality of representative digit image is higher than default image quality threshold value.
The advantage that the present invention compared with prior art had or good effect:
1, current-mode more flexibly, runs into severe external environment condition (illumination condition, background contrasts etc.), can promote the quality of image by increasing the mode of electric current, thereby location is more accurately provided.And prior art has been solidified size of current, even if when image quality is extremely low, also cannot reach the object that promotes image quality by adjusting electric current.
When 2, guaranteeing positioning precision, greatly reduced the power consumption of navigator.When external environment condition is more excellent, guarantee, under the prerequisite of image quality, can lower electric current.Likely under extremely low current-mode, the image quality that also can provide.
In sum, than prior art, the invention provides a kind of adaptive electric current regulate and control method, the method has larger adaptability, location more accurately can be provided, and have great power consumption advantages.The lifting of the flying power of mobile device is had to good realistic price.
Claims (2)
1. a self-adaptive current regulate and control method in optical navigation equipment, comprises DSP processing module and the pel array, the analog-to-digital conversion module that are connected with described DSP processing module; Pel array is connected with analog-to-digital conversion module by sensing circuit, programmable gain amplifier; It is characterized in that, in described DSP processing module, current control module is set, DSP processing module is connected with sensing circuit, programmable gain amplifier and analog-to-digital conversion module respectively by current control module; Described self-adaptive current regulate and control method comprises the steps:
(a), DSP processing module controls pel array and gathers image, and obtains digital picture after AD sampling, DSP processing module judges the image quality of described digital picture;
(b), DSP processing module is by the image quality of described digital picture and the comparison of default image quality threshold value, when the image quality of described digital picture does not mate with default image quality threshold value, DSP processing module is adjusted the working current value in sensing circuit, programmable gain amplifier or analog-to-digital conversion module by current control module, so that transfer to image quality and the default image quality threshold value of the digital picture in DSP processing module after AD sampling, matches.
2. self-adaptive current regulate and control method in optical navigation equipment according to claim 1, is characterized in that: the working current form that described current control module is adjusted in sensing circuit, programmable gain amplifier or analog-to-digital conversion module is increase electric current or reduce electric current.
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| CN111107275A (en) * | 2018-10-26 | 2020-05-05 | 原相科技股份有限公司 | Low-energy-consumption navigation device |
| CN111694447A (en) * | 2019-03-11 | 2020-09-22 | 原相科技股份有限公司 | Multimode optical navigation device and method |
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Application publication date: 20140827 |