CN111738960A - Image processing apparatus, image processing method, and image forming apparatus - Google Patents
Image processing apparatus, image processing method, and image forming apparatus Download PDFInfo
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Abstract
The embodiment of the invention provides an image processing device, an image processing method and an image forming device, wherein the device comprises at least one image correction module; the image correction module is used for receiving the image data to be processed, performing correction processing and scaling processing on the image data to be processed and outputting the image data; the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data; the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing. The image processing device provided by the embodiment of the invention simultaneously realizes correction processing and scaling processing through the image correction module occupying less memory, reduces the occupied memory, can improve the processing speed, reduces the required buffer space relative to the image enhancement module, improves the image processing capacity and meets the requirement of high-speed image output.
Description
Technical Field
The embodiment of the invention relates to the technical field of image processing, in particular to an image processing device, an image processing method and an image forming device.
Background
Image forming apparatuses, such as printers, need to perform scaling processing on acquired image data to be processed in a horizontal and/or vertical direction when performing image formation, so as to meet the requirements of image output of different sizes.
In the prior art, correction, enhancement processing and printing processing are generally performed on acquired image data respectively through an image correction module, an image enhancement processing module and a printing image processing module in sequence. In the process of enhancing the image data output by the correction module through the image enhancement processing module, the image data is subjected to transverse and/or longitudinal scaling processing according to the required image output size so as to meet the image output requirements of different sizes.
However, the image enhancement processing module often has insufficient processing capability during the image processing process by the above scheme, so that the image processing performance is poor, and the high-speed image output requirement cannot be met.
Disclosure of Invention
Embodiments of the present invention provide an image processing apparatus, an image processing method, and an image forming apparatus, so as to improve image processing performance and meet a demand for high-speed image output.
In a first aspect, an embodiment of the present invention provides an image processing apparatus, including: at least one image correction module;
the image correction module is used for receiving image data to be processed, correcting and zooming the image data to be processed and outputting the image data;
the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data;
the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
In one possible design, the image processing apparatus further includes: a print image processing module;
and the printing image processing module is connected with the image correction module and used for performing printing pretreatment on the image data output by the image correction module and outputting the image data subjected to the printing pretreatment to printing equipment for printing.
In one possible design, the printing pre-processing includes at least one of: neutral gray correction, color space conversion processing, special color enhancement, neighborhood processing, color trapping, gamma correction, image binarization processing, image bit exchange, linear precision correction, boundary adjustment and special angle rotation.
In one possible design, the image processing apparatus further includes: an image enhancement module;
the input end of the image enhancement module is connected with the image correction module, and the output end of the image enhancement module is connected with the print image processing module, and the image enhancement module is used for enhancing the image data output by the image correction module and outputting the image data to the print image processing module.
In one possible design, the enhancement process includes at least one of: neutral gray correction, color space conversion processing, background removal, filtering processing, boundary adjustment and arbitrary angle rotation.
In one possible design, the image correction module includes: a correction unit and a scaling unit;
the correction unit is used for carrying out photosensitive correction processing on the image data to be processed, and is used for making up for the characteristic difference of the optical sensor to obtain corrected data;
and the scaling unit is connected with the correction unit and is used for scaling the corrected data in the horizontal direction and the vertical direction.
In one possible design, the image correction module further includes: a conversion unit;
and the conversion unit is used for performing conversion processing from color to gray scale on the color image data received from the correction unit and sending the obtained gray scale image data to the scaling unit.
In one possible design, the correction unit includes: a color syndrome unit;
the color corrector subunit is configured to perform color correction processing on the color edge image in the color image data received from the correction unit to obtain data after correction processing, and send the data after correction processing to the scaling unit.
In one possible design, the correction unit further includes: the device comprises a chip gap syndrome subunit, a gamma syndrome subunit and a bit depth adjusting subunit;
the chip gap corrector subunit is used for correcting the chip gap of the image data to be processed;
the gamma correction subunit is connected with the chip gap correction subunit and is used for carrying out gamma correction on the image data after the chip gap correction;
the bit depth adjusting subunit is connected to the gamma correcting subunit, and is configured to perform bit depth adjustment on the image data after gamma correction, and send the obtained data after bit depth adjustment to the color shifting subunit;
correspondingly, the color corrector subunit is configured to perform color correction processing on the color edge image in the data after the bit depth adjustment, so as to obtain the data after the correction processing.
In one possible design, the image correction module further includes: a horizontal mirroring unit, and/or a boundary adjustment unit;
the horizontal mirroring unit is used for horizontally mirroring the image data subjected to the zooming processing in the automatic paper feeding mode;
and the boundary adjusting unit is used for adjusting the boundary of the image data after the zooming processing or the image data after the horizontal mirror image processing.
In one possible design, the image forming apparatus includes: a programmable module;
the programmable module is used for detecting the correction parameters of the image data to be processed and outputting the obtained detection result to the image processing equipment; wherein the correction parameters comprise at least one of: image density value, position deviation value, and inclination angle blank page determination result.
In a possible design, if the correction parameter is an image density value, the image processing apparatus further includes a print image processing module, and the programmable module is configured to output an obtained detection result to the print image processing module after detecting the correction parameter of the image data to be processed, so that the print image processing module performs density correction processing on the image data to be processed.
In a possible design, if the correction parameter is a position offset value, the programmable module is configured to detect the correction parameter of the image data to be processed, and output an obtained detection result to the image correction module, so that the image correction module performs position offset correction processing on the image data to be processed.
In a possible design, if the correction parameter is a position offset value, the image processing apparatus further includes an image enhancement module, and the programmable module is configured to output an obtained detection result to the image enhancement module after detecting the correction parameter of the image data to be processed, so that the image enhancement module performs position offset correction processing on the image data to be processed;
or, the image processing apparatus further includes a print image processing module, where the programmable module is configured to output an obtained detection result to the print image processing module after detecting a correction parameter of the image data to be processed, so that the print image processing module performs a position offset correction process on the image data to be processed.
In a possible design, if the correction parameter is a tilt angle value, the image processing apparatus further includes an image enhancement module, and the programmable module is configured to output an obtained detection result to the image enhancement module after detecting the correction parameter of the image data to be processed, so that the image enhancement module performs tilt correction processing on the image data to be processed.
In a possible design, if the correction parameter further includes a blank page determination result, the programmable module is configured to output an obtained tilt angle detection result to the image processing device when the detection result is a non-blank page after detecting the blank page determination result of the image data to be processed, so that the image processing device performs tilt correction processing on the image data to be processed.
In one possible design, the programmable module is a digital processing chip or a library of algorithms.
In a second aspect, an embodiment of the present invention provides an image forming apparatus including: a printing apparatus and an image processing apparatus as described in the first aspect and various possible designs of the first aspect;
the image processing device is used for receiving image data to be processed, performing correction processing and scaling processing on the image data to be processed and outputting the image data to the printing device; the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data; the scaling processing comprises scaling processing in the horizontal direction and the vertical direction on the data after the correction processing;
the printing device is used for printing the image data output by the image processing device.
In one possible design, the image forming apparatus further includes a reading device;
the reading device is used for acquiring an image of data to be printed, obtaining the image data to be processed and outputting the image data to be processed to the image processing device.
In a third aspect, an embodiment of the present invention provides an image processing method, including:
receiving image data to be processed;
correcting and zooming the image data to be processed and outputting the image data;
the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data;
the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
According to the image processing device, the image processing method and the image forming device, the image correction module occupying less memory is used for simultaneously realizing correction processing and scaling processing in the horizontal direction and the vertical direction, the occupied memory is reduced, the processing speed can be improved, the required buffer space is reduced relative to the image enhancement module, the image processing performance is improved, and the requirement of high-speed image output is met. Furthermore, the programmable module is used for detecting the correction parameters of the image to be processed, and then the image processing equipment is used for correcting the image according to the detection result of the correction parameters.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an image processing apparatus according to yet another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an image processing apparatus according to yet another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an image processing apparatus according to yet another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an image correction module according to another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an image correction module according to yet another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an image correction module according to yet another embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an image correction module according to yet another embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an image correction module according to yet another embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an image correction module according to yet another embodiment of the present invention;
FIG. 11 is a schematic structural diagram of an image forming apparatus according to yet another embodiment of the present invention;
FIG. 12 is a schematic view of an image forming apparatus according to still another embodiment of the present invention;
fig. 13 is a flowchart illustrating an image processing method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present invention. As shown in fig. 1, the image forming apparatus includes an acquisition unit 101, an image processing device 102, and an output unit 103. The acquiring unit 101 is configured to receive image processing to be processed and output acquired image data to be processed to the image processing apparatus 102, and the acquiring unit 101 may be, for example, a scanner configured to perform a reading operation on an original placed on a scanning platen or an ADF feeder of the image forming apparatus, thereby acquiring image data to be processed. The image processing apparatus 102 is configured to perform relevant processing such as correction, image quality enhancement, and print processing on received image data to be processed, and send the processed data to the output unit 103 for output. The source of the image data to be processed acquired by the acquiring unit 101 is various, and the image data may be the image data read by the acquiring unit 101 included in the image forming apparatus, or the image data to be processed sent to the image forming apparatus by an external terminal such as a mobile phone or a computer connected to the image forming apparatus. The output unit 103 outputs the processed data in various ways, and may be a printing device included in the image forming apparatus that prints out the data processed by the image processing device 102, or an external terminal such as a mobile phone or a computer connected to the image forming apparatus that outputs the image data to be processed by the output unit 103.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic structural diagram of an image processing apparatus 20 according to yet another embodiment of the present invention. As shown in fig. 2, the image processing apparatus 20 is included in an image forming device, the image processing apparatus 20 including: at least one image correction module 201.
The image correction module 201 is configured to receive image data to be processed, perform correction processing and scaling processing on the image data to be processed, and output the image data.
The correction processing comprises photosensitive correction processing on image data to be processed, and is used for making up characteristic difference of the optical sensor to obtain corrected data;
the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
In this embodiment, the image correction module 201 may be implemented by a pure hardware module, or may be implemented by a hardware-software combination module.
The optical sensor may be a CCD sensor or a CIS sensor, and is configured to perform a reading operation on an original document placed on a scanning platen of the image forming apparatus or an ADF paper feeder to acquire image data to be processed, where the characteristic difference of the optical sensor specifically refers to: due to the manufacturing process limitation of the optical sensor, the sensitivity of the optical sensor to the same optical signal is different, which causes the difference of the image data finally output by the imaging system, and the correction process is used for making up the optical characteristic difference of the optical sensor, so that the image data after the correction process is consistent, that is, the same image data is obtained for the same optical signal.
Specifically, the correction processing performed by the image correction module 201 may include at least one of: chip gap correction, gamma adjustment, bit depth adjustment, color shift, gray level conversion processing, horizontal mirroring and boundary adjustment. For a detailed description of each process, reference may be made to the description in the following embodiments, which are not repeated herein.
The scaling processing performed by the image correction module 201 includes horizontal scaling and vertical scaling, where the scaling processing in the horizontal direction is used to perform scaling processing on the width direction of the image to be processed in the horizontal direction, and the scaling processing in the vertical direction is used to perform scaling processing on the height of the image to be processed in the vertical direction. For example, if the data to be processed needs to be printed on a printing medium of a4 specification, such as a paper sheet, when the width of the image data to be processed corresponding to the file to be printed is greater than the width of a4 size, and the height of the image data to be processed is greater than the height of a4 size, the image data to be processed needs to be reduced in the horizontal direction and the vertical direction at the same time, so as to ensure that the image to be processed can be presented on the printing medium in a proper size.
The image correction module performs correction processing and scaling processing on image data to be processed and outputs the image data, can directly output the processed image data subjected to the correction processing and the scaling processing to an external terminal such as a computer and a mobile phone connected with the image forming device for the image correction module, and can also output the processed image data subjected to the correction processing and the scaling processing to a first module different from the image correction module contained in the image processing equipment for the image correction module, so that the image forming device performs printing output.
The image processing apparatus 20 provided in this embodiment simultaneously implements the correction processing and the scaling processing by the image correction module 201 occupying less memory, reduces the occupied memory, can improve the processing speed, and reduces the required buffer space compared with the image enhancement module 203, thereby improving the image processing performance and satisfying the requirement of high-speed image output.
Fig. 3 is a schematic structural diagram of an image processing apparatus 20 according to yet another embodiment of the present invention. As shown in fig. 3, in addition to the embodiment shown in fig. 2, a print image processing module 202 is added in the present embodiment, and the image processing apparatus 20 further includes: a print image processing module 202.
And the print image processing module 202 is connected to the image correction module 201, and is configured to perform print preprocessing on the image data output by the image correction module 201, and output the image data after print preprocessing to a printing device for printing.
Optionally, the printing pre-processing comprises at least one of: neutral gray correction, color space conversion processing, special color enhancement, neighborhood processing, color trapping, gamma correction, image binarization processing, image bit exchange, resolution conversion enhancement, linear precision correction, boundary adjustment and special angle rotation.
In this embodiment, the above pre-processing may be performed by independent modules, for example, a neutral gray correction unit, a color space conversion processing unit, a special color enhancement unit, a neighborhood processing unit, a color trapping unit, a gamma correction unit, an image binarization processing unit, an image bit exchange unit, a resolution conversion enhancement unit, a linear precision correction unit, a boundary adjustment unit 2015, and a special angle rotation unit. In practical applications, different modules are selected for combination according to actual requirements to perform printing preprocessing on the image data input from the image correction module 201 to the printing image processing module 202.
In order to perform more sophisticated print preprocessing, in this embodiment, the print image processing module 202 may include: the system comprises a neutral gray correction unit, a color space conversion processing unit, a special color enhancement unit, a neighborhood processing unit, a color trapping unit, a gamma correction unit, an image binarization processing unit, an image bit exchange unit, a resolution conversion enhancement unit, a linear precision correction unit, a boundary adjustment unit 2015 and a special angle rotation unit which are sequentially connected in series.
Specifically, the neutral gray correction unit is used for removing color noise points in the gray scale area to realize neutral gray correction. The gray area of the image is ensured not to contain color components, and neutral gray of the image is realized. The neutral gray calibration unit may adopt various calibration manners, for example, the neutral gray calibration unit may perform multiplication operation by using coefficients of the 3 × 1 color matrix and the 3 × 3 matrix to realize conversion from one color space to another color space. When the RGB (R is red, G is green and B is blue) color mode is converted into the YCbCr (Y is a brightness component, Cb is a blue chrominance component and Cr is a red chrominance component) mode, the neighborhood mean value processing is carried out on the CrCb, and then the removal of color mixed points in the gray scale area is realized, and the neutral gray correction is realized.
A color space conversion processing unit for realizing color space conversion of the RGB color mode into a printing four-color mode CMYK (C is cyan, also called 'sky blue' or 'blue |', M is magenta, also called 'magenta', Y is yellow, and K is black) by a look-up table by using a color space conversion method.
And the special color enhancement unit is used for realizing the enhancement of printing of special colors with weak reproduction capability, such as light colors, bright colors and the like, during black-and-white printing so as to enable a printed piece to be clearer.
And the neighborhood processing unit module is used for performing enhancement processing on the CMYK color data or the color data subjected to special color enhancement to improve the image quality.
The color trapping unit is used for preventing the light color under the dark color from being exposed by a method of white leakage repairing or contraction expanding in order to make up for white leakage between adjacent different colors caused by inaccurate overprinting, and the upper dark color is kept unchanged so as to ensure that the visual effect is not influenced because human eyes always feel that the dark color is close and the light color is far.
And the gamma correction unit is used for performing gamma correction (for example, correction can be performed by introducing an automatic correction curve) before the image binarization processing is performed by the image binarization module, so that the gradation change of the image is ensured to be consistent with the gradation reaction of human eyes.
And the image binarization processing unit is used for converting 10bit or 8bit image data into printable 1bit, 2bit or 4bit image data in a threshold matrix or error diffusion mode.
And the image bit exchange unit module is used for carrying out bit exchange on the image data and handing the exchanged data to the printing engine for processing.
And the resolution conversion enhancement unit is used for improving the image quality level of low resolution.
And the linear precision correction unit is used for correcting the linear precision of the image data so as to solve the problem that a printing straight line is bent and deformed due to the influence of self factors of equipment and the like and ensure accurate output of the image.
The boundary adjusting unit 2015 is configured to process left and right boundaries of the image data to ensure smoothness of the image.
And the special angle rotating unit is used for rotating the image data by a special angle, and the special angle can be 90 degrees, 180 degrees and the like so as to meet the printing requirements of users.
In practical applications, after the image processing apparatus 20 processes the image data to be processed through the image correction module 201, the processed data may be subjected to various processes such as printing, faxing and the like. Taking printing as an example, a reading device (e.g., a scanner) reads image data of data to be processed, and sends the image data to be processed to at least one image correction module 201 of the image processing device 20. The at least one image correction module 201 receives image data to be processed, and after the image data to be processed is subjected to correction processing and scaling processing, the processed data is sent to the print image processing module 202, the print image processing module 202 can perform neutral gray correction on the image data input by the image correction module 201 through a neutral gray correction unit, and perform color space conversion processing on the corrected data through a color space conversion processing unit, and perform special color enhancement processing on the data after the color space conversion processing through a special color enhancement unit, perform neighborhood processing on the data after the special color enhancement through a neighborhood processing unit, perform color trapping processing on the data after the neighborhood processing through a color trapping unit, perform gamma correction on the data after the color trapping processing through a gamma correction unit, and perform image processing on the module after the gamma correction through a binarization processing unit, and the data after the binarization processing passes through an image bit exchange unit, the data after the bit exchange is subjected to resolution conversion enhancement by a resolution conversion enhancement unit, the data after the resolution conversion enhancement is subjected to linear precision correction by a linear precision correction unit, the data after the precision correction is subjected to left and right boundary adjustment by a boundary adjustment unit 2015, the data after the boundary adjustment is subjected to special angle rotation by a special angle rotation unit, and finally the image data after the rotation is output to a printing device so that the printing device can print to obtain a printed file.
The image processing apparatus 20 provided in this embodiment can directly input the image to be processed to the print image processing module 202 to perform print preprocessing after performing the correction processing and the scaling processing on the image to be processed by the image correction module 201. Compared with the prior art in which the scaling process is performed by the image enhancement module 203, according to the present embodiment, since the scaling process is completed in the image correction module 201 in the previous stage, if there is no higher requirement for the quality of the image data, the image enhancement process of the image enhancement module 203 can be omitted, the processing speed can be increased, and the hardware cost of the image enhancement module 203 can be saved.
Fig. 4 is a schematic structural diagram of an image processing apparatus 20 according to yet another embodiment of the present invention. As shown in fig. 4, on the basis of the embodiment shown in fig. 3, in order to improve the image quality, an image enhancement module 203 is added in the present embodiment, and the image processing apparatus 20 further includes: an image enhancement module 203;
and the input end of the image enhancement module 203 is connected with the image correction module 201, and the output end of the image enhancement module is connected with the print image processing module 202, and the image enhancement module is used for enhancing the image data output by the image correction module 201 and outputting the image data to the print image processing module 202.
Optionally, the enhancement treatment comprises at least one of: neutral gray correction, color space conversion processing, background removal, filtering processing, boundary adjustment and arbitrary angle rotation.
In this embodiment, the above enhancement processing can be performed by independent modules, for example, a neutral gray correction unit, a color space conversion processing unit, a background removal unit, a filter processing unit, a boundary adjustment unit 2015, and an arbitrary angle rotation unit. In practical application, different modules are selected for combination according to actual requirements to perform enhancement processing on the image data input from the image correction module 201 to the image enhancement module 203.
In order to improve the image quality and achieve a higher quality printing effect, in this embodiment, the image enhancement processing module may include: the system comprises a neutral gray correction unit, a color space conversion processing unit, a background removal unit, a filtering processing unit, a boundary adjustment unit 2015 and an arbitrary angle rotation unit which are connected in series in sequence.
Specifically, the neutral gray correction unit is used for removing color noise points in the gray scale area to realize neutral gray correction. The gray area of the image is ensured not to contain color components, and neutral gray of the image is realized. The neutral gray calibration unit may adopt various calibration manners, for example, the neutral gray calibration unit may perform multiplication operation by using coefficients of the 3 × 1 color matrix and the 3 × 3 matrix to realize conversion from one color space to another color space. When the RGB (R is red, G is green and B is blue) color mode is converted into the YCbCr (Y is a brightness component, Cb is a blue chrominance component and Cr is a red chrominance component) mode, the neighborhood mean value processing is carried out on the CrCb, and then the removal of color mixed points in the gray scale area is realized, and the neutral gray correction is realized.
A color space conversion processing unit for realizing color space conversion of the RGB color mode into a printing four-color mode CMYK (C is cyan, also called 'sky blue' or 'blue |', M is magenta, also called 'magenta', Y is yellow, and K is black) by a look-up table by using a color space conversion method.
And the special color enhancement unit is used for realizing the enhancement of printing of special colors with weak reproduction capability, such as light colors, bright colors and the like, during black-and-white printing so as to enable a printed piece to be clearer.
And the background removing unit is used for removing the background of the gray level image so as to meet the special requirements of customers.
And the filtering processing unit is used for carrying out reticulate pattern reduction and filtering processing on the image data to realize image smoothing and character enhancement.
And the boundary adjusting unit 2015 is used for performing upper, lower, left and right trimming processing on the image data to ensure that the image is positioned in the center of the breadth.
The rotation of any angle is used for rotating the image data by any angle, and is suitable for special scenes such as scanning, copying and deviation rectification.
In practical applications, after the image processing apparatus 20 processes the image data to be processed through the image correction module 201, the processed data may be subjected to various processes such as printing, faxing and the like. Taking printing as an example, a reading device (e.g., a scanner) reads image data of data to be processed, and sends the image data to be processed to at least one image correction module 201 of the image processing device 20. The at least one image correction module 201 receives image data to be processed, and after performing correction processing and scaling processing on the image data to be processed, sends the processed data to the image enhancement module 203, the image enhancement module 203 can perform neutral gray correction on the image data input by the image correction module 201 through a neutral gray correction unit, and perform color space conversion processing on the data after the neutral gray correction through a color space conversion processing unit, and perform background removal on the data after the color space conversion through a background removal unit, and perform texture reduction filtering processing on the data after the background removal through a filtering processing unit, and perform upper-lower left-right boundary adjustment on the data after the filtering processing through a boundary adjustment unit, and perform arbitrary angle rotation on the data after the boundary adjustment through an arbitrary angle rotation unit, and send the rotated data to the print image processing module 202, the print image processing module 202 can perform neutral gray correction on the image data input by the image correction module 201 through a neutral gray correction unit, perform color space conversion processing on the corrected data through a color space conversion processing unit, perform special color enhancement processing on the data after the color space conversion processing through a special color enhancement unit, perform neighborhood processing on the data after the special color enhancement through a neighborhood processing unit, perform color trapping processing on the data after the neighborhood processing through a color trapping unit, perform gamma correction on the data after the color trapping processing through a gamma correction unit, perform image binarization processing on the module after the gamma correction through an image binarization processing unit, perform image bit exchange processing on the data after the binarization processing through an image bit exchange unit, and perform resolution conversion enhancement on the data after the bit exchange through a resolution conversion enhancement unit, and the data after resolution conversion enhancement is subjected to linear precision correction through a linear precision correction unit, the data after precision correction is subjected to left and right boundary adjustment through a boundary adjustment unit 2015, the data after boundary adjustment is subjected to special angle rotation through a special angle rotation unit, and finally the rotated image data is output to printing equipment so that the printing equipment can print to obtain a printed file.
The image processing apparatus 20 provided in this embodiment performs correction processing and scaling processing on image data to be processed by the image correction module 201, performs image quality enhancement by the image enhancement module 203, performs print preprocessing by the image print image processing module 202, and performs processing such as printing on the processed data, thereby realizing high-quality printing, and performs scaling processing by the image correction module 201, thereby realizing high-speed image processing, occupying less memory, and improving the performance of image processing.
Fig. 5 is a schematic structural diagram of an image processing apparatus 20 according to yet another embodiment of the present invention. As shown in fig. 5, on the basis of the embodiments shown in fig. 2 to 4, the present embodiment describes the image correction module 201 in detail, and the image correction module 201 includes: a correction unit 2011 and a scaling unit 2012.
The correcting unit 2011 is configured to perform sensitization correction on the image data to be processed, and is configured to compensate for a characteristic difference of the optical sensor to obtain data after the sensitization correction.
The scaling unit 2012 is connected to the correction unit and is configured to perform scaling processing in the horizontal direction and the vertical direction on the data after the correction processing.
The optical sensor may be a CCD sensor or a CIS sensor, and is configured to perform a reading operation on an original document placed on a scanning platen of the image forming apparatus or an ADF paper feeder to acquire image data to be processed, where the characteristic difference of the optical sensor specifically refers to: due to the manufacturing process limitation of the optical sensor, the sensitivity of the optical sensor to the same optical signal is different, which causes the difference of the image data finally output by the imaging system, and the correction process is used for making up the optical characteristic difference of the optical sensor, so that the image data after the correction process is consistent, that is, the same image data is obtained for the same optical signal. The scaling processing in the horizontal direction is used for scaling the image to be processed in the width direction of the horizontal direction, and the scaling processing in the vertical direction is used for scaling the image to be processed in the height direction of the vertical direction.
Alternatively, as shown in fig. 6, on the basis of fig. 5, the correction unit 2011 includes: the color syndrome unit 20114.
A color correction subunit 20114, configured to perform color correction processing on the color edge image in the color image data received from the correction unit to obtain data after the correction processing, and send the data after the correction processing to the scaling unit.
In this embodiment, the color corrector subunit 20114 is used to process the color edge image, so that the image quality and the scanning speed can be effectively considered during fast scanning.
As shown in fig. 6, the correction unit 2011 further includes: a chip gap syndrome unit 20111, a gamma syndrome unit 20112, and a bit depth adjustment subunit 20113.
The die gap corrector subunit 20111 is configured to perform a die gap correction process on the image data to be processed.
The gamma correction subunit 20112 is connected to the die gap correction subunit 20111, and is configured to perform gamma correction on the image data after the die gap correction.
A bit depth adjusting subunit 20113, connected to the gamma correcting subunit 20112, configured to perform bit depth adjustment on the image data after gamma correction, and send the obtained data after bit depth adjustment to the color shifting subunit;
accordingly, the color corrector subunit 20114 is configured to perform color correction processing on the color edge image in the data after the bit depth adjustment, so as to obtain data after the correction processing.
Specifically, the scanning assembly formed by the contact image sensor includes a plurality of chip chips, and because a small gap exists between the chip chips, an obvious chip line exists on an image (between the chip chips), and the chip gap corrector subunit 20111 can eliminate the gap between the chip chips to make up for the image difference between the chip chips.
To ensure that the details of the image gradation level are not lost, the data output from the inter-chip gap syndrome unit 20111 may be gamma corrected by the gamma corrector subunit 20112. The gamma bit depth of the corrected image data is 16bits, and the fidelity of the image is guaranteed.
The bit depth adjustment subunit 20113 can reduce the data output by the gamma correction subunit 20112 from 16bits to 10/8/1 bits (wherein 1bit only refers to grayscale images), and the reduction of bit can greatly reduce image data, so that the color adjustment work can be operated in the maximum value range.
The color correction subunit 20114 can correct the physical position of the image pixels, since the reading device (e.g., a scanner composed of a contact image sensor) moves at a constant speed with respect to the sensor, so that the image device can capture only one color (3 colors for one pixel) at a time. This problem can be corrected by the color correction subunit 20114 so that the three colors in 1 pixel are at the same location. The elimination of color edges is realized in the image correction module 201, and the quality of fast scanning printing is improved.
Optionally, as shown in fig. 7, on the basis of fig. 5, the image correction module 201 further includes: a transformation unit 2013.
A conversion unit 2013, configured to perform color-to-grayscale conversion processing on the color image data received from the correction unit, and send the obtained grayscale image data to the scaling unit.
Specifically, in the grayscale scanning or monochrome copy mode, the conversion processing from color to grayscale is performed on the image data received from the correction unit through white light scanning, that is, in the grayscale scanning or monochrome copy mode, the RGB color mode is converted into grayscale by white light scanning, so as to ensure the color information of the output image to the maximum extent.
In this embodiment, the conversion unit 2013 is arranged to convert a color image into a grayscale image in a scanning stage, so that a scanned piece with grayscale display can be obtained, and a printed piece with grayscale display can be obtained after a print image is processed in a later stage. Compared with the prior art, the method has the advantages that the application scene is enlarged and the wide requirements of users can be met only by converting the color image into the gray image in the printing stage. In addition, the conversion unit 2013 converts the three-channel RGB data into the single-channel Y data in the early stage, so that the computation amount and computation resources can be saved in the whole image processing process. Compared with the prior art that the RGB data are firstly converted into YYY data and then the YYY data are converted into Y data, the data storage requirement can be reduced, and the data processing speed can be improved.
Optionally, as shown in fig. 8, on the basis of fig. 7, the image correction module 201 further includes: a horizontal mirroring unit 2014, and/or a boundary adjusting unit 2015.
A horizontal mirroring unit 2014 for horizontally mirroring the image data subjected to the scaling process in the auto paper feeding mode.
A boundary adjusting unit 2015, configured to perform boundary adjustment on the scaled image data or the horizontally mirrored image data.
Specifically, when the reading apparatus is in the automatic paper feeding mode, the horizontal mirroring unit 2014 may horizontally mirror the data output by the zooming unit, so as to meet the requirement of the automatic paper feeding scenario. If the image correction module 201 includes the horizontal mirroring unit 2014, the boundary adjustment unit 2015 may perform boundary adjustment on the horizontally mirrored image data output by the horizontal mirroring unit 2014, and send the boundary-adjusted data to the printing apparatus for printing. If the image correction module 201 does not include the horizontal mirroring unit 2014, the boundary adjustment unit 2015 may perform boundary adjustment on the image data after the scaling process output by the scaling unit and send the data after the boundary adjustment to the printing apparatus for printing. Optionally, the boundary adjusting unit 2015 may perform left-right boundary adjustment and/or upper-lower boundary adjustment, which may be specifically selected according to actual needs, and this embodiment is not limited.
The image processing apparatus 20 provided in the present embodiment corrects the image data to be processed by the correction unit, horizontally and/or vertically scales the corrected image data by the scaling unit, and outputs the image data after the scaling processing to cause the printing apparatus to perform printing. Compared with the prior art in which the scaling unit is arranged in the image enhancement module 203, the scaling unit is arranged in the image correction module 201 in this embodiment, which can occupy less memory, can adapt to the application scene of high-speed printing, improve the image processing performance, and can meet the requirement of high-speed image output.
Alternatively, as shown in fig. 9, in addition to fig. 2, the image forming apparatus 30 further includes: programmable module 301.
The programmable module 301 is configured to detect a correction parameter of image data to be processed, and output an obtained detection result to a corresponding module in the image processing apparatus, so that the module performs correction processing according to the detection result; wherein the correction parameters include at least one of: the image density value is determined by the programmable module according to the difference between the current image density value and the target image density value, the image position offset value is determined by the programmable module according to the difference between the current image position and the target image position, and the inclination angle value is specifically the angle deviation value of the current image relative to the horizontal direction or the vertical direction, which is calculated by the programmable module.
In the embodiment, the programmable module is used for detecting the correction parameters of the image to be processed, and then the image processing device is used for correcting the image according to the detection result of the correction parameters.
In practical applications, the programmable module 301 may be implemented by hardware, or by software, or by a combination of software and hardware. For example, programmable module 301 may be a digital processing chip or a library of algorithms.
Specifically, taking the programmable module 301 as a digital processing chip DSP as an example, the function of the programmable module 301 will be described below. For the image processing device with pipeline design, the image processing device can be realized by adopting a mode of cooperative work of a DSP and hardware, specifically, the hardware of the image processing device can comprise an image correction module 201, and the image correction module 201 is mainly used for realizing necessary image processing and improving the processing performance; the DSP is mainly used for realizing special function development and has the advantage of high flexibility. Of course, the hardware of the image processing apparatus may further include an image enhancement module 203 and a print image processing module 202. As shown in fig. 10, in a specific implementation process, the programmable module 301 may read image data from the reading interface 303 through the storage module 302, and perform detection on the correction parameter of the image data, and an obtained detection result may be sent to a module, which needs to apply the detection result, of the image correction module 201, the image enhancement module 203, and the print image processing module 202 in the image processing apparatus 20 through the storage module 302, so that the module completes corresponding processing. The print interface 304 is used to output data to be printed, which is output from the image correction module 201 or the print image processing module 202 to the storage module 302, to a printing apparatus for printing.
In a possible implementation, if the correction parameter is an image density value, the image processing apparatus further includes a print image processing module, and the programmable module is configured to output an obtained detection result to the print image processing module after detecting the correction parameter of the image data to be processed, so that the print image processing module performs density correction processing on the image data to be processed.
In another possible implementation, if the correction parameter is a position offset value, the programmable module is configured to, after detecting the correction parameter of the image data to be processed, output an obtained detection result to the image correction module, so that the image correction module performs position offset correction processing on the image data to be processed.
In another possible implementation, if the correction parameter is a position offset value, the image processing apparatus further includes an image enhancement module, and the programmable module is configured to, after detecting the correction parameter of the image data to be processed, output an obtained detection result to the image enhancement module, so that the image enhancement module performs position offset correction processing on the image data to be processed;
or, the image processing device further comprises a print image processing module, and the programmable module is used for outputting an obtained detection result to the print image processing module after detecting the correction parameter of the image data to be processed, so that the print image processing module performs the position offset correction processing on the image data to be processed.
In another possible implementation, if the correction parameter is a tilt angle value, the image processing apparatus further includes an image enhancement module, and the programmable module is configured to output an obtained detection result to the image enhancement module after detecting the correction parameter of the image data to be processed, so that the image enhancement module performs tilt correction on the image data to be processed.
In another possible implementation, if the correction parameter further includes a blank page determination result, the programmable module is configured to, after detecting the blank page determination result of the image data to be processed, output the obtained tilt angle detection result to the image processing device when the detection result is a non-blank page, so that the image processing device performs tilt correction processing on the image data to be processed.
Specifically, the DSP may send the obtained detection result to a module of the image enhancement module, and the image enhancement module performs image processing and correction. For example, the DSP detects the tilt angle of the image and determines whether the image is a blank page, and when the image is not a blank page, the DSP sends the detected tilt angle value to the rotation unit of the image enhancement processing module for performing tilt angle processing according to the tilt angle value. For another example, the DSP may send the processed data to a module of the print image processing module, and the print image processing module performs image processing and correction. Specifically, the DSP may perform image density detection on the image to be processed, and send the detected image density detection value to a gamma corrector subunit in the print image processing module, so as to perform density correction processing according to the density detection value. The DSP may also perform image position offset (C, M, Y offset of three colors compared to that of a black image) correction and send the detected position offset value to a boundary adjustment unit in the print image processing module for image position offset processing based on the above-mentioned offset value detection value.
In this embodiment, the programmable module is configured to detect the correction parameters of each image processing module (image correction module, image enhancement module, or print image processing module) in the image processing apparatus, and send the detection result to the corresponding module, so that the detection algorithm can be flexibly updated and expanded, and the method is suitable for various application scenarios and requirements. Compared with the method for realizing various operations only by a non-programmable hardware module, the method can flexibly expand various algorithms or update the existing algorithms.
Fig. 11 is a schematic structural diagram of an image forming apparatus 90 according to still another embodiment of the present invention. As shown in fig. 11, the image forming apparatus 90 includes: a printing apparatus 901 and an image processing apparatus 20 as in the above-described embodiment.
An image processing device 20 configured to receive image data to be processed, perform correction processing and scaling processing on the image data to be processed, and output the image data to the printing device 901; the correction processing comprises photosensitive correction processing on image data to be processed, and is used for making up characteristic difference of the optical sensor to obtain corrected data; the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
A printing apparatus 901 for printing image data output by the image processing apparatus 20.
In practical applications, the reading device 902 (e.g., a scanner) reads image data of data to be processed, and sends the image data to be processed to at least one image correction module 201 of the image processing device 20. The at least one image correction module 201 receives image data to be processed, and after performing correction processing and scaling processing on the image data to be processed, outputs the processed data to the printing device 901, so that the printing device 901 performs printing to obtain a print file.
The image forming apparatus 90 provided in this embodiment completes the scaling processing by the image correction module 201 occupying less memory, and performs image processing by using the image processing device 20 including the image correction module 201, so that the image forming apparatus 90 can adapt to an application scenario of high-speed printing, improve image processing performance, and can meet a requirement for high-speed image output.
Alternatively, as shown in fig. 12, on the basis of fig. 11, the image forming apparatus 90 further includes a reading device 902;
the reading apparatus 902 is configured to acquire an image of data to be printed, obtain image data to be processed, and output the image data to be processed to the image processing apparatus 20.
In practical applications, the reading device 902 (e.g., a scanner) reads image data of data to be processed, and sends the image data to be processed to at least one image correction module 201 of the image processing device 20. The at least one image correction module 201 receives image data to be processed, and after performing correction processing and scaling processing on the image data to be processed, outputs the processed data to the printing device 901, so that the printing device 901 performs printing to obtain a print file.
The image forming apparatus 90 provided in this embodiment completes the scaling process by the image correction module 201 occupying less memory, and performs the image processing by using the image processing device 20 including the image correction module 201, so that the image forming apparatus 90 can adapt to the application scenario of high-speed printing, and avoid the problem of poor image processing performance caused by insufficient memory, and meet the requirement of high-speed image output.
Fig. 13 is a flowchart of an image processing method according to an embodiment of the present invention, applied to the image processing apparatuses shown in fig. 2 to 10, and as shown in fig. 13, the method includes:
1301. image data to be processed is received.
1302. And carrying out correction processing and scaling processing on the image data to be processed and outputting the image data. The correction processing comprises photosensitive correction processing on image data to be processed, and is used for making up characteristic difference of the optical sensor to obtain corrected data; the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
The optical sensor may be a CCD sensor or a CIS sensor, and is configured to perform a reading operation on an original document placed on a scanning platen of the image forming apparatus or an ADF paper feeder to acquire image data to be processed, where the characteristic difference of the optical sensor specifically refers to: due to the manufacturing process limitation of the optical sensor, the sensitivity of the optical sensor to the same optical signal is different, which causes the difference of the image data finally output by the imaging system, and the correction process is used for making up the optical characteristic difference of the optical sensor, so that the image data after the correction process is consistent, that is, the same image data is obtained for the same optical signal.
In this embodiment, the implementation subject of step 1301 and step 1302 in the method is an image correction module, and the image correction module may be implemented by a pure hardware module, or may be implemented by a hardware-software combination module.
Specifically, the correction processing performed by the image correction module may include at least one of: chip gap correction, gamma adjustment, bit depth adjustment, color shift, gray level conversion processing, horizontal mirroring and boundary adjustment. For a detailed description of each process, reference may be made to the description in the following embodiments, which are not repeated herein.
The scaling processing performed by the image correction module comprises horizontal scaling and vertical scaling, wherein the scaling processing in the horizontal direction is used for scaling the image to be processed in the width direction of the horizontal direction, and the scaling processing in the vertical direction is used for scaling the height of the image to be processed in the vertical direction. For example, if the data to be processed needs to be printed on a printing medium of a4 specification, such as a paper sheet, when the width of the image data to be processed corresponding to the file to be printed is greater than the width of a4 size, and the height of the image data to be processed is greater than the height of a4 size, the image data to be processed needs to be reduced in the horizontal direction and the vertical direction at the same time, so as to ensure that the image to be processed can be presented on the printing medium in a proper size.
In practical applications, after the image processing apparatus processes the image data to be processed through the image correction module, the image processing apparatus may perform various processes such as printing, faxing and the like on the processed data. Taking printing as an example, a reading device (e.g., a scanner) reads image data of data to be processed, and sends the image data to be processed to at least one image correction module of an image processing device. The at least one image correction module receives image data to be processed, and outputs the processed data to the printing equipment after correction processing and scaling processing are carried out on the image data to be processed, so that the printing equipment can print to obtain a printed file.
The image processing device provided by the embodiment simultaneously realizes correction processing and scaling processing through the image correction module occupying less memory, reduces the occupied memory, can improve the processing speed, reduces the required buffer space relative to the image enhancement module, improves the image processing performance, and can meet the requirement of high-speed image output.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. An image processing apparatus included in an image forming apparatus, comprising: at least one image correction module;
the image correction module is used for receiving image data to be processed, correcting and zooming the image data to be processed and outputting the image data;
the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data;
the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
2. The apparatus of claim 1, wherein the image correction module comprises: a correction unit and a scaling unit;
the correction unit is used for carrying out photosensitive correction processing on the image data to be processed, and is used for making up for the characteristic difference of the optical sensor to obtain corrected data;
and the scaling unit is connected with the correction unit and is used for scaling the corrected data in the horizontal direction and the vertical direction.
3. The apparatus of claim 2, wherein the image correction module further comprises: a conversion unit;
and the conversion unit is used for performing conversion processing from color to gray scale on the color image data received from the correction unit and sending the obtained gray scale image data to the scaling unit.
4. The apparatus of claim 2, wherein the correction unit comprises: a color syndrome unit;
the color corrector subunit is configured to perform color correction processing on the color edge image in the color image data received from the correction unit to obtain data after correction processing, and send the data after correction processing to the scaling unit.
5. The apparatus according to any one of claims 1 to 4, wherein the image forming device includes: a programmable module;
the programmable module is used for detecting the correction parameters of the image data to be processed and outputting the obtained detection result to the image processing equipment; wherein the correction parameters comprise at least one of: image density value, position offset value, inclination angle, blank page determination result.
6. The apparatus according to claim 5, wherein if the correction parameter is an image density value, the image processing apparatus further comprises a print image processing module, and the programmable module is configured to output an obtained detection result to the print image processing module after detecting the correction parameter of the image data to be processed, so that the print image processing module performs density correction processing on the image data to be processed.
7. The apparatus according to claim 5, wherein if the correction parameter is a position offset value, the programmable module is configured to output an obtained detection result to the image correction module after detecting the correction parameter of the image data to be processed, so that the image correction module performs position offset correction processing on the image data to be processed.
8. The apparatus according to claim 5, wherein if the correction parameter is a position offset value, the image processing apparatus further comprises an image enhancement module, and the programmable module is configured to output an obtained detection result to the image enhancement module after detecting the correction parameter of the image data to be processed, so that the image enhancement module performs position offset correction processing on the image data to be processed;
or, the image processing apparatus further includes a print image processing module, where the programmable module is configured to output an obtained detection result to the print image processing module after detecting a correction parameter of the image data to be processed, so that the print image processing module performs a position offset correction process on the image data to be processed.
9. The apparatus according to claim 5, wherein if the correction parameter is a tilt angle value, the image processing apparatus further comprises an image enhancement module, and the programmable module is configured to output an obtained detection result to the image enhancement module after detecting the correction parameter of the image data to be processed, so that the image enhancement module performs tilt correction on the image data to be processed.
10. The apparatus according to claim 9, wherein if the correction parameter further includes a blank page determination result, the programmable module is configured to output an obtained tilt angle detection result to the image processing apparatus when a detection result is a non-blank page after detecting the blank page determination result of the image data to be processed, so that the image processing apparatus performs tilt correction processing on the image data to be processed.
11. An image forming apparatus, comprising: a printing apparatus and an image processing apparatus according to any one of claims 1 to 10;
the image processing device is used for receiving image data to be processed, performing correction processing and scaling processing on the image data to be processed and outputting the image data to the printing device; the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data; the scaling processing comprises scaling processing in the horizontal direction and the vertical direction on the data after the correction processing;
the printing device is used for printing the image data output by the image processing device.
12. An image processing method applied to the image processing apparatus according to any one of claims 1 to 10, the method comprising:
receiving image data to be processed;
correcting and zooming the image data to be processed and outputting the image data;
the correction processing comprises the steps of carrying out sensitization correction processing on the image data to be processed, and making up for the characteristic difference of an optical sensor to obtain corrected data;
the scaling processing includes scaling processing in the horizontal direction and the vertical direction for the data after the correction processing.
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