CN102651796B - Residual image correcting method of electronic images and electronic image forming device - Google Patents
Residual image correcting method of electronic images and electronic image forming device Download PDFInfo
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- CN102651796B CN102651796B CN201110056478.2A CN201110056478A CN102651796B CN 102651796 B CN102651796 B CN 102651796B CN 201110056478 A CN201110056478 A CN 201110056478A CN 102651796 B CN102651796 B CN 102651796B
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Abstract
The invention provides a residual image correcting method of electronic images and is used for an electronic image forming device with a light sensing body. The residual image correcting method comprises the following steps that: a page of image data required to form images is converted into a page of data bitmap; whether parts causing residual image generation exist in the page of image data or not is judged, if so, the initial position of the part causing the residual image generation is determined, and the initial position of the residual image generation part corresponding to the part causing the residual image generation is obtained through calculation according to the circumference length of the light sensing body and the initial position of the residual image generation part; whether the initial position of the residual image generation part is in the range of the page or not is judged, if so, the size of the part causing the residual image generation is determined, and in addition, the size of the effective residual image generation part of the residual image generation part in the range of the page is determined; and the data bitmap corresponding to the effective residual image generation part is corrected, and a new data bitmap is formed for offsetting residual images.
Description
Technical field
The image retention correction method and the electronic image that the present invention relates to a kind of electronic image form device.
Background technology
As shown in Figure 1, in traditional image processing system such as photocopier, printer etc., by charged roller, make photosensitive body surface wear upper uniform current potential, the photosensitive surface of the Ear Mucosa Treated by He Ne Laser Irradiation uniform charged of recycling laser (laser diode) transmitting is to remove corresponding current potential, thus formation electrostatic latent image.Then, by developer roll, developer is transferred on photosensitive surface and formed visual image, by transfer roll, the visual image of photosensitive surface is transferred on paper.Yet according to the characteristic of photoreceptor self, after the last week, electronic image formed, photosensitive surface has the residual phenomenon of static, is subject to the impact of this residual electric potential, when within next week, electronic image forms, image retention can occur, as shown in grey piece P ', Q ' in Fig. 3.In order to overcome this defect, common way is, in charged roller, makes one of the charged front increase of photosensitive surface except electric light, gets rid of the residual electric potential of photosensitive surface, thereby guarantees image retention not to occur.Should put position a or the b place that for example can be arranged on as shown in the figure except electric light.
Because use except electric light, so be necessary for its reserved necessary space in image processing system, this is unfavorable for the miniaturization of device to a certain extent, also needs certain cost except electric light itself simultaneously, thus reduce installation cost aspect also without any advantage.On the other hand, except electric light is to have a plurality of LED to form, and the function of LED, the power of LED can not arbitrarily change, uncontrolled, furthermore, when the environment for use of device or due to the deviation of photoreceptor self, when forming, electronic image also can there is the halfway phenomenon of image retention correspondence.
Summary of the invention
One object of the present invention is to provide a kind of image retention correction method of electronic image, for having the electronic image of photoreceptor, forms device, comprises the following steps:
One page view data that a. need to form image is converted to a page data bit figure;
B. according to this page data bit figure, judge in this one page view data whether have the part that causes that image retention occurs, if had, enter step c;
C. determine the original position that this causes the part that image retention occurs, and cause this original position of the part that image retention occurs according to the girth of this photoreceptor and this, calculate the original position that part occurs the image retention corresponding with this part that causes that image retention occurs;
D. judge that part occurs this image retention this original position whether within the scope of this one page, if so, determines the size that this causes the part that image retention occurs, and enter step e;
There is this original position partly in the size and this image retention that e. according to this, cause this region of the part that image retention occurs, determines that the size that part occurs effective image retention of part within the scope of this one page occurs this image retention; And
F. be there is to data bitmap corresponding to part in this effective image retention and carry out revisal, form new data bitmap to offset image retention.
Preferably, the array that this page data bit figure is comprised of a plurality of pixels position, and each pixel position is represented by binary code " 1 " or " 0 " respectively, wherein, a pixel position is " 1 ", being illustrated in this this one page view data corresponding to place, pixel position has view data, and a pixel position is " 0 ", and being illustrated in this this one page view data corresponding to place, pixel position does not have view data.
Preferably, in this step b, this array to this page data bit figure detects, when being consecutively detected the above pixel position for " 1 " of M and listing and be consecutively detected while more than N being the pixel position of " 1 " one in a line, judge and in this one page view data, have corresponding this of the data bit graph region that detects with this cause the part that image retention occurs, otherwise be just judged as and do not have, wherein, this M, N be in this page data bit figure with the line number and the columns that cause the corresponding array of least part that image retention occurs.
Preferably, in this step c, in this page data bit figure, this this original position that causes the part that image retention occurs causes that for this part of image retention generation is from the position of the upper end beeline of this page.
Preferably, in this step e, this original position that causes the part that image retention occurs from this, detect and calculate in this line continuously for the number A of the pixel position of " 1 " and at this number B who lists continuously as the pixel position of " 1 ", with the size of determining that this causes the part that image retention occurs.
Preferably, in step f, be there is to data bitmap corresponding to part in this image retention and carry out revisal and be: take continuous four figures according to being one group, while having two 1 or three 1 in these continuous four pixel positions, one of them 1 is changed into 0.
Preferably, between step e and f, further comprise the step of selecting revisal pattern according to the serviceable bife of this photoreceptor.
Preferably, between step e and f, further comprise according to the step of the humidity of this photoreceptor surrounding environment or temperature selection revisal pattern.
Another object of the present invention is to provide a kind of electronic image to form device, this image processing system is implemented the image retention correction method of electronic image as above.
By the inventive method, can in the situation that not using except electric light, reach equally the effect of avoiding image retention to occur.Use the electronic image of the inventive method to form the object that device can reach miniaturization, and, owing to not needing, except electric light, therefore can to reduce costs.
Accompanying drawing explanation
Fig. 1 is that existing electronic image forms the schematic diagram that device forms image;
Fig. 2 is the flow chart of the image retention correction method of electronic image according to an embodiment of the invention;
Fig. 3 is that schematically illustrated Minimum Residual is as the figure of the example of generating unit;
Fig. 4 causes the part of image retention and the figure of the example of image retention generating unit according to an embodiment of the invention;
To image retention, there is the chart that data bitmap partly carries out revisal according to an embodiment of the invention in Fig. 5;
To image retention, there is the chart that data bitmap partly carries out revisal according to another embodiment of the present invention in Fig. 6; And
Fig. 7 is the chart that carries out revisal according to the data bitmap to image retention generation part of further embodiment of this invention.
Embodiment
Below, with reference to the accompanying drawings execution mode involved in the present invention is described.
Fig. 2 is the flow chart of the image retention correction method of electronic image according to an embodiment of the invention.The same with prior art, in image processing system, be provided with controller, laser and photoreceptor, image processing system is connected with external host.
First, this controller receives and need to form one page view data of image from external host, and one page view data is converted to a page data bit figure (step S21).
Referring to Fig. 3, shown the schematic diagram corresponding to a page data bit figure of for example A4 paper.The array that this page data bit figure is comprised of a plurality of pixels position, for simplicity, has only shown a plurality of pixels position of the first row in Fig. 3.The length L of A4 paper is 297 millimeters, and width W is 210 millimeters.In addition, the upper left end points of A4 paper of take is initial point, and horizontal direction is as X-axis, and vertical direction is that Y-axis forms coordinate system, and there is its concrete coordinate each pixel position, and for example, the coordinate of upper left first pixel position in drawing is (0,0).Each pixel position is respectively by binary code " 1 " or " 0 " expression, and wherein, a pixel position is " 1 ", and being illustrated in this place, pixel position has view data, and a pixel position is " 0 ", and being illustrated in this place, pixel position does not have view data.For example, coordinate is that the pixel position place of (500,500) is during for " 1 ", represent that in one page view data, locating corresponding position with this pixel position has view data, that is to say, locate to form image on corresponding one-page with this pixel position, for example, form black image.And coordinate is the pixel position place of (0,0) during for " 0 ", represent that in one page view data, locating corresponding position with this pixel position does not have view data, that is to say, locate on corresponding one-page not form image with this pixel position, be blank.
Controller is according to this page data bit figure, judge and in this one page view data, whether have the part (step S22) that causes that image retention occurs, if had, enter step S23, if do not had, in the image forming course of one page view data, thereby laser irradiates and forms image (step S28) photoreceptor according to a page data bit figure.In this example, cause that the part that image retention occurs is for example black patch P, the Q shown in Fig. 3.
In this step S22, controller detects the array of the page data bit figure shown in Fig. 3, when being consecutively detected the above pixel position for " 1 " of A and listing and be consecutively detected while more than B being the pixel position of " 1 " one in a line, judge in one page view data, have the data bit graph region that detects with this corresponding cause the part that image retention occurs, otherwise be just judged as and do not have.
Wherein, A, B be in this page data bit figure with the line number and the columns that cause the corresponding array of least part that image retention occurs.Fig. 4 has shown the least part that causes in this page data bit figure that image retention occurs, i.e. the corresponding array of minimum black patch, and its line number is A, columns is B.
Concrete, according to experimental result, in one page paper, length and the width of supposing this minimum black patch are 0.5 millimeter, according to common resolution in prior art, the length of every 25.4 millimeters has 600 pixel positions, just can calculate so, A=0.5 * 600/25.4=12 pixel position, B=0.5 * 600/25.4=12 pixel position.Certainly, according to actual conditions or the different demands to picture quality, the length of this minimum black patch and width can be also other values.
Controller detects the array of the page data bit figure shown in Fig. 3, when being consecutively detected 12 above pixel positions for " 1 " and listing while being consecutively detected 12 above pixel positions for " 1 " one in a line, judge that in one page view data, existence causes the part that image retention occurs, that is, black patch P and Q.
Then, enter step S23, determine the original position that this causes the part that image retention occurs.
This causes that the original position of the part that image retention occurs is the position causing in the part that image retention occurs from the pixel position of the top margin beeline of this page.That is to say, from the starting position of a page data bit figure, detect line by line, the position that the part that causes that image retention occurs detected is at first the original position that causes the part of image retention generation.Here, the coordinate of the starting position of a page data bit figure is (0,0), and the position that black patch P detected is at first for example coordinate (500,500), the coordinate of the original position of black patch P is (500,500), equally, the coordinate of the original position of black patch Q is (2000,6762).
Then enter step S24, according to the girth of photoreceptor and the original position that causes the part that image retention occurs, calculate the original position that part occurs the image retention corresponding with causing part that image retention occurs.
Photoreceptor is for example realized by photosensitive drums, and its girth is for example 29.4 millimeters, its corresponding length D=29.4 * 600/25.4=694 in data bitmap.The original position coordinate (500 of black patch P, 500) coordinate figure in X-axis is constant, the girth D of the coordinate figure in Y-axis and photosensitive drums is added, be Y+D=500+694=1194, obtain the original position that part occurs the image retention corresponding with black patch P, that is, the coordinate of the original position of grey piece P ' is (500,1194).The coordinate of original position that equally, can calculate ash discharge piece Q ' is for (2000,7456).
Judge that part occurs image retention original position is whether within the scope of one page (step S25), if not, in the image forming course of one page view data, thereby laser irradiates and forms image (step S28) photoreceptor according to a page data bit figure, if so, enter step S26.
Concrete, in step S25, controller judges that the original position (2000,7456) of the original position (500,1194) of grey piece P ', grey piece Q ' is whether within the scope of one page.The length of the paper in this example is 297 millimeters, maximum coordinates value in Y-axis is 297 * 600/25.4=7015 so, if the value of the original position of controller judgement ash discharge piece in Y-axis is greater than 7015, represent that the original position of this ash piece, not within the scope of this one page, need not carry out revisal to it.Known by calculating, grey piece Q ' is not within the scope of one page, and grey piece P ' is within the scope of one page.
Then enter step S26, determine the size in the region of the part that causes that image retention occurs, and there is original position partly according to the size and the image retention that cause the region of the part that image retention occurs, determine that the size that part occurs effective image retention of part within the scope of one page occurs image retention.
Here, controller is from causing the original position of the part that image retention occurs, detect and calculate in a line continuously for the number of the pixel position of " 1 " and in a number listing continuously as the pixel position of " 1 ", to determine the size in the region of the part that causes that image retention occurs.
Concrete, controller is from the original position (500 of black patch P, 500) start, detect and calculate in a line continuously for the number M of the pixel position of " 1 " and at a number N who lists continuously as the pixel position of " 1 ", width using M as this black patch P, length using N as this black patch P, can determine the size in the region of this black patch P thus.For example, M=100, N=600.
Afterwards, according to the original position (500,1194) of the width M of black patch P and length N and grey piece P ', determine that the size of part occurs effective image retention of grey piece P ' within the scope of one page.Here, the original position (500 of ash piece P ', 1194), value by it in Y-axis and 1194 and length N add up to 1194+600=1794, here, 1794 < 7015 (length of this paper), represent that this ash piece P ' is within the scope of one page, so grey piece P ' is exactly effective image retention generation part, and the length of this ash piece P ' is N=600, width is M=100 (size that part occurs image retention equals to cause that the size of part occurs image retention), can determine thus the size of grey piece P ' (effectively image retention generation part).
Lift in addition an image retention situation of part partly within one page scope occurs.If it is (500 that foregoing step obtains the original position of grey piece R ' (not shown), 6615), by it value in Y-axis and 6615 and length N add up to 6615+600=7215, this 7215 > 7015 (length of this paper), region in so grey piece R ' within the scope of one page is only effective image retention part (its region outside one page scope will not considered) occurs, its width is for example 100, length is 7015-6615=400, that is, determine that the size of part occurs effective image retention.
As can be seen here, in the present invention, cause that the width of the part (black patch) that image retention occurs is all identical with the width that part (grey piece) and effective image retention generation part occur image retention; The length that causes the part (black patch) that image retention occurs is identical with the length that part (grey piece) occurs image retention, and may be different from the length of effective image retention generation part.
In step S27, be there is to data bitmap corresponding to part in effective image retention and carry out revisal, form new data bitmap to offset image retention.
To image retention, there is the chart that data bitmap partly carries out revisal according to an embodiment of the invention in Fig. 5.With reference to figure 5, data bitmap corresponding to part occurred image retention to, and to carry out revisal be to take continuous four pixel positions image corresponding to part occurred image retention to carry out thin out processing as one group, with continuous four pixel position D3, D2, D1, D0 is one group, while having two 1 or three 1 in continuous four pixel positions, one of them 1 is changed into 0.In continuous four pixel positions, be all 0, or be all 1, or only have in the situation of 1 and do not carry out revisal.For example, as continuous four pixel position D3, D2, D1, the data of D0 are 0,0,1,1 o'clock, and one of them 1 is changed into 0.In the time of specific implementation, by continuous four pixel position D3, D2, D1, the data of D0, as tetrad code, are converted to a data of 16 paper feed systems.For example 0,0,1,1 can be converted to hexadecimal number 3.Reduce again this hexadecimal number, for example, by 3, be reduced to 2, just can realize 0,0, change into 0 for one 1 in 1,1, just can realize the thin out processing that image retention is occurred to for image corresponding to part.
In step S28, according to data bit, figure forms image.In this step, if there is not the part that causes that image retention occurs in view data, according to initial data bit pattern, become image; If existed in view data, cause the part that image retention occurs, and there is data bitmap corresponding to part by revisal and form new data bitmap in image retention effectively, according to new data bit figure, forms image.
To image retention, there is the chart that data bitmap partly carries out revisal according to another embodiment of the present invention in Fig. 6.The difference in photoreceptor useful life also can cause the concentration of normal picture that corresponding variation occurs.In order to eliminate the concentration difference that this photoreceptor life-span causes, need to be according to deciding revisal data the useful life of photoreceptor.According to the service time of photoreceptor (being rotational time definitely), can determine the useful life of photoreceptor.The present embodiment is identical with the embodiment major part shown in Fig. 2, wherein difference is, further between step S26 and S27, increase for judging the step in the useful life of sightseeing body, if the life-span of photoreceptor is more than 10%, select the first revisal pattern and enter step S27, if the life-span of photoreceptor, is selected the second revisal pattern and enters step S27 when following 10%.Fig. 6 show the photoreceptor life-span 10% the first revisal pattern when above, and the photoreceptor life-span 10% the second revisal pattern when following.As we know from the figure, compare with the first revisal pattern, the second revisal pattern makes image retention that part occur and becomes lighter.
Fig. 7 is the chart that carries out revisal according to the data bitmap to image retention generation part of further embodiment of this invention.The difference of photoreceptor surrounding enviroment temperature and humidity can cause the deviation of the concentration of normal picture equally.The concentration deviation causing in order to eliminate this photoreceptor surrounding environment, need to determine revisal data according to photoreceptor temperature and humidity around.The present embodiment is identical with the embodiment major part shown in Fig. 2; wherein difference is; further between step S26 and S27, increase for judging the step of environmental information of the surrounding of photoreceptor; if photoreceptor environment of living in is common environment; select the first revisal pattern and enter step S27; if photoreceptor environment of living in is low temperature or low wet environment, selects the second revisal pattern and enter step S27.Fig. 6 shows the first revisal pattern that photoreceptor environment of living in is common environment, and photoreceptor environment of living in is the second revisal pattern of low temperature or low wet environment.As we know from the figure, compare with the first revisal pattern, the second revisal pattern makes image retention that part occur and becomes lighter.
By the inventive method, can in the situation that not using except electric light, reach equally the effect of avoiding image retention to occur.Use the electronic image of the inventive method to form the object that device can reach miniaturization, and, owing to not needing, except electric light, therefore can to reduce costs.
Those skilled in the art are easy to expect additional advantage and modification.Therefore, the present invention is not limited to detail and the exemplary embodiment that provides and illustrate in literary composition with regard to wider aspect.Thereby, can be in the situation that do not deviate from and carry out various modifications as the essence of appended claim and the defined total inventive concept of equivalent thereof or protection range.
Claims (9)
1. an image retention correction method for electronic image, forms device for having the electronic image of photoreceptor, it is characterized in that, comprises the following steps:
One page view data that a. need to form image is converted to a page data bit figure;
B. according to a described page data bit figure, judge in described one page view data whether have the part that causes that image retention occurs, if had, enter step c;
C. described in determining, cause the original position of the part that image retention occurs, and according to the girth of described photoreceptor and described in cause the described original position of the part that image retention occurs, calculate the original position that part occurs the image retention corresponding with the described part that causes that image retention occurs;
D. judge that part occurs described image retention described original position whether within the scope of described one page, if so, causes the size of the part that image retention occurs described in determining, and enters step e;
E. described in basis, cause the size of the part that image retention occurs and the described original position that part occurs described image retention, determine that the size of part occurs effective image retention of described image retention generation part within the scope of described one page; And
F. be there is to data bitmap corresponding to part in described effective image retention and carry out revisal, form new data bitmap to offset image retention.
2. the image retention correction method of electronic image as claimed in claim 1, it is characterized in that, the array that a described page data bit figure is comprised of a plurality of pixels position, and each pixel position is represented by binary code " 1 " or " 0 " respectively, wherein, a pixel position is " 1 ", and being illustrated in this described one page view data corresponding to place, pixel position has view data, a pixel position is " 0 ", and being illustrated in this described one page view data corresponding to place, pixel position does not have view data.
3. the image retention correction method of electronic image as claimed in claim 2, it is characterized in that, in described step b, described array to a described page data bit figure detects, when being consecutively detected the above pixel position for " 1 " of M and listing and be consecutively detected while more than N being the pixel position of " 1 " one in a line, judge in described one page view data, have the data bit graph region that detects with this corresponding described in cause the part that image retention occurs, otherwise be just judged as and do not have, wherein, described M, N is in a described page data bit figure and causes line number and the columns of the corresponding array of least part that image retention occurs.
4. the image retention correction method of electronic image as claimed in claim 1, in described step c, from the starting position of a described page data bit figure, the position that causes the part that image retention occurs described in detecting at first causes the described original position of the part that image retention occurs described in being.
5. the image retention correction method of electronic image as claimed in claim 1, it is characterized in that, in described step e, from the described described original position that causes the part that image retention occurs, detect and calculate in described a line continuously for the number A of the pixel position of " 1 " and at the described one number B listing continuously as the pixel position of " 1 ", to cause the size of the part that image retention occurs described in determining.
6. the image retention correction method of electronic image as claimed in claim 1, it is characterized in that, in step f, data bitmap corresponding to part occurred to for described image retention carries out revisal and is one group for take continuous four pixel positions, while having two 1 or three 1 in described continuous four pixel positions, one of them 1 is changed into 0.
7. the image retention correction method of electronic image as claimed in claim 1, is characterized in that, further comprises the step of selecting revisal pattern according to the serviceable bife of described photoreceptor between step e and f.
8. the image retention correction method of electronic image as claimed in claim 1, is characterized in that, further comprises according to the step of the humidity of described photoreceptor surrounding environment or temperature selection revisal pattern between step e and f.
9. electronic image forms a device, it is characterized in that, implements the claims the method described in any one in 1-8.
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