CN101634555B - Image motion compensation method of area array CCD camera - Google Patents
Image motion compensation method of area array CCD camera Download PDFInfo
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- CN101634555B CN101634555B CN2009103049748A CN200910304974A CN101634555B CN 101634555 B CN101634555 B CN 101634555B CN 2009103049748 A CN2009103049748 A CN 2009103049748A CN 200910304974 A CN200910304974 A CN 200910304974A CN 101634555 B CN101634555 B CN 101634555B
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Abstract
The invention relates to an image motion compensation method of an area array CCD camera, which belongs to the technical field of photography measurement and mainly solves the technical problems of enhanced design difficulty, complex structure, difficult control, low compensation precision, high cost, and the like of mechanical compensation which needs to design a complicated electromechanical control system to trace the running state of a plane due to the limit of own elements of aerial photography measurement in the prior art. The image motion compensation method comprises the following steps: acquiring earth surface scenery information through a high-velocity image reading circuit; continuously collecting images; storing the images into an image buffering storage circuit; obtaining a flight sate parameter during the exposure of the camera from an input control part with velocity-height ratio V/H; processing the obtained information; determining the displacement of each image, and modifying the displacement of each image; aligning the images point by point by an image displacement summation circuit; adding pixels point by point to obtain a final image; and outputting a brilliant image by an image output circuit so as to realize image motion compensation.
Description
Technical field
The present invention relates to a kind of photogrammetric technology, especially relate to a kind of image motion compensation method of area array CCD camera.
Background technology
Photogrammetric measurement (aerial photogrammetry) refers to aboard absorbs photo with aerophotographic apparatus continuously to ground, the combined ground control point survey, transfers and to paint and step such as stereo mapping, the operation of drawing out topomap.
Image drift is meant that in the camera shooting process there is the phenomenon of motion in the picture of ground scenery on image planes, and the speed of motion is commonly referred to image drift speed.For the shake of camera or the mobile displacement that can produce image of camera.The existence of image drift will cause image blur, make the photograph of camera resemble resolving power decline, greatly influence the camera imaging quality.Therefore,, the image of high definition be expected, just high-precision forward motion compensation must be carried out for the aerospace camera of high resolution.
At present, ubiquitous IMC technology is a mechanical compensation, yet mechanical compensation need design the complicated Mechatronic control system of a cover, with the tracking aircraft running status, because the restriction of the factor of photogrammetric measurement own makes mechanical compensation increase design difficulty, complex structure and restive, compensation precision is low, the cost height.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of image motion compensation method of area array CCD camera, it mainly is to solve the existing in prior technology mechanical compensation need design the complicated Mechatronic control system of a cover, with the tracking aircraft running status, because the restriction of the factor of photogrammetric measurement own, make mechanical compensation increase design difficulty, complex structure and restive, compensation precision is low, the technical matters that cost is high.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:
A kind of image motion compensation method of area array CCD camera of the present invention is characterized in that:
Form by high speed image sensing circuit, visual buffer storage circuit, figure image shift summation circuit, fast height ratio V/H input control section, visual output circuit;
Obtain face of land scene information by the high speed image sensing circuit, the continuous acquisition image stores visual buffer storage circuit into;
Flight status parameter when height ratio V/H input control section obtains camera exposure rapidly simultaneously;
Information to above acquisition is handled, and treatment step comprises: determine the displacement of every images, revise the displacement of image, utilize figure image shift summation circuit that image is carried out the pointwise alignment, pixel pointwise addition obtains final image;
Utilize visual output circuit output picture rich in detail, realize IMC.
The present invention realizes the high speed IMC by utilizing multiple exposure, view data to superpose, and gets a distinct image.Suppose and to be divided into n time the time shutter, gather n width of cloth image, in the compensation process, by operation to data image pointwise alignment, pixel pointwise stack, make the data of each pixel become the n dual intensity, improved signal to noise ratio (S/N ratio), the time shutter of every width of cloth image becomes T/n, as long as guarantee that image moves less than a pixel in exposure, then every width of cloth image all is clearly, the energy recovery of having got back of the every width of cloth image in back that adds up, thus motion blur eliminated, reach the effect of IMC.
As preferably, described continuous acquisition image is multiple exposure, and the time shutter is divided into n time, gathers the n images.
As preferably, described V/H parameter and camera exposure time parameter according to input calculates the displacement of determining every images, revises the displacement of image, makes n images pointwise alignment, with the pixel pointwise addition of n images.
As preferably, the velocity of displacement of described hypothesis image on image planes is V, and the shutter time shutter is T, the pixel size is P, and then image drift amount is S=(V*T)/P, and makes multiple exposure frequency n=S, the time shutter of every width of cloth image is T/n, and the image drift amount of image is not more than 1.
Therefore, the present invention has the method that has adopted multiple exposure, view data to superpose, and recovers the energy of every width of cloth image, improve the quality of image, and compare to the mechanical compensation method, it does not need the Mechatronic control system of project organization complexity, thereby is convenient to characteristics such as control when reducing cost yet.
Description of drawings
Accompanying drawing 1 is a theory diagram of the present invention;
Accompanying drawing 2 is the image shift of the present invention synoptic diagram that add up;
Accompanying drawing 3 is IMC principle schematic of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: a kind of image motion compensation method of area array CCD camera of this example the steps include:
By accompanying drawing 1 as can be seen imaging system comprise camera lens, shutter and CCD device, be responsible for to gather the ground scene information, the high speed image sensing circuit is responsible for obtaining image.Utilize the image buffers memory circuit that image is stored in the buffer zone, will store in the buffer zone in the lump by the flight status information that fast height ratio V/H input control section obtains simultaneously.Image is mobile less than a pixel in the exposure, and every width of cloth all is clearly.Suppose that the velocity of displacement of image on image planes is V, the shutter time shutter is T, the pixel size is P, then image drift amount is S=(V*T)/P, therefore, for guaranteeing the clarity of image, can set the multiple exposure number of times is n=S, the time shutter of then every width of cloth image is reduced into T/n, makes the image drift amount of image be not more than 1.
Utilize the displacement that canned data such as fast height ratio, time shutter etc. are calculated every width of cloth image in the buffer zone, the displacement of correction image makes each width of cloth image pointwise align, as shown in Figure 2.By E=T*L, T is the time shutter, E is an energy, L is that each exposure obtains light intensity, as can be seen: the time shutter has shortened, and the energy of every width of cloth image becomes original n/one, makes that the energy of center section each point reverts to initial value on the image but by the image shift summation circuit each width of cloth image pointwise is added up, just edge fraction energy is short of to some extent, as shown in Figure 3.Image energy is restored, and has eliminated motion blur, thereby has realized the IMC of high speed image.
The picture rich in detail that finally obtains is transmitted by image output circuit.
Claims (4)
1. image motion compensation method of area array CCD camera is characterized in that:
Obtain face of land scene information by the high speed image sensing circuit, the continuous acquisition image stores visual buffer storage circuit into;
Flight status parameter when height ratio V/H input control section obtains camera exposure rapidly simultaneously;
Information to above acquisition is handled, and treatment step comprises: determine the displacement of every images, revise the displacement of image, utilize figure image shift summation circuit that image is carried out the pointwise alignment, pixel pointwise addition obtains final image;
Utilize visual output circuit output picture rich in detail, realize IMC.
2. a kind of image motion compensation method of area array CCD camera according to claim 1 is characterized in that described continuous acquisition image is multiple exposure, and the time shutter is divided into n time, gathers the n images.
3. a kind of image motion compensation method of area array CCD camera according to claim 1 and 2, it is characterized in that described V/H parameter and camera exposure time parameter according to input calculates the displacement of determining every images, revise the displacement of image, make the pointwise of n images align, with the pixel pointwise addition of n images.
4. a kind of image motion compensation method of area array CCD camera according to claim 1 and 2, it is characterized in that the velocity of displacement of described hypothesis image on image planes is V, the shutter time shutter is T, the pixel size is P, then image drift amount is S=(V*T)/P, and making that multiple exposure frequency n=S, the time shutter of every width of cloth image are T/n, the image drift amount of image is not more than 1.
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| CN2009103049748A CN101634555B (en) | 2009-07-30 | 2009-07-30 | Image motion compensation method of area array CCD camera |
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| CN101634555B true CN101634555B (en) | 2011-09-21 |
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| CN102209198B (en) * | 2011-06-13 | 2013-01-02 | 中国科学院长春光学精密机械与物理研究所 | Aerospace-application-based integration time adjustable linear array charge coupled device (CCD) camera system |
| CN103558858A (en) * | 2013-11-13 | 2014-02-05 | 魏树桂 | Collecting robot implement system based on machine vision |
| CN107121152B (en) * | 2017-04-28 | 2020-01-03 | 长春长光睿视光电技术有限责任公司 | Forward image motion compensation method of three-axis gyroscope stabilization platform |
| CN108174188B (en) * | 2017-12-14 | 2019-08-27 | 中国科学院西安光学精密机械研究所 | Image motion compensation error measuring method of camera device |
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