JP2017204802A - Data correction system and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data correction system that, when data correction is performed, solves the problem occurring from the fact that every input digital data has a fixed differential value in a certain range, and a method for controlling the same.SOLUTION: In a data correction circuit 9, digital data is corrected at a set correction magnification to create corrected data. In a data adjustment circuit 10, digits after the decimal point of the corrected data is rounded down to create adjusted data. In an integer data addition/subtraction circuit 11, integer data is randomly added to the created adjusted data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a data correction system and a control method thereof.

  Since digital data must be converted to integers, when correcting image data, there is a method of rounding the decimal part of the correction value to an integer and adding it to the image data (Patent Document 1). In addition, there are analog / digital converters that faithfully reproduce the color level of a subject even when so-called rounding occurs (Patent Document 2), and those that correct variations in sensitivity for each pixel of a solid-state imaging device ( Patent Document 3). In addition, there is also a method in which a correction error multiplied by a predetermined coefficient is added to make an integer (Patent Document 4). As described above, since digital data needs to be converted into integers, various ideas have been made.

  Figures 12 and 13 show the relationship between input digital data and adjusted data (output data) when the input digital data is corrected by multiplying it by a desired correction factor between 0 and 1 times. Show. FIG. 12 shows an example when the input digital data (value represented by “100”) is “100”, and FIG. 13 shows the case where the input digital data is “55”.

  In both FIG. 12 and FIG. 13, the input digital data can be corrected with the correction magnification corresponding to the correction setting value in 256 steps. In such a digital data correction system, the correction magnification is a fractional multiple excluding 0 and 1. If the digital data is multiplied by a fractional factor, the corrected digital data may not be an integer. If it is not an integer, the data is truncated so that it becomes an integer. For example, as shown in Fig. 12, if the input digital data is "100" and the correction magnification is "0.996", the corrected value is "99.6", so the value after the decimal point is truncated. , Adjusted data is “99”. Similarly, as shown in Fig. 11, when the input digital data is "55" and the correction magnification is "0.996", the corrected value is "54.78", so the value after the decimal point is rounded down. The adjusted data is “54”.

JP 2012-95204 A JP 2002-232741 A JP 2004-128653 A JP2015-233229A

  FIG. 14 shows the relationship between the input digital data and the input / output difference value between the input digital data and the adjusted data. The horizontal axis is the input digital data, and the vertical axis is the input / output difference value. When the correction setting value is 256 (the correction magnification is 1), the input / output difference value is “0” regardless of the input digital data, as shown by the graph G1. When the correction set value is 255 (the correction magnification is 0.996 times), the input / output difference value becomes “−1” regardless of the input digital data, as shown by the graph G2. When the correction set value is 254 (the correction magnification is 0.992 times), the input / output difference value is “−1” or “−2” as shown by the graph G3. When the correction set value is 253 (the correction magnification is 0.988), the input / output difference value is “−1”, “−2”, or “−3” as shown by the graph G4.

  FIG. 15 is a diagram in which correction setting values are assigned to 64 blocks Br (one block Br is composed of one or a plurality of pixels) obtained by dividing an image into 8 parts in the horizontal direction and the vertical direction. . “256” is assigned as the correction setting value to the four blocks Br1 in the center portion, and “255” is assigned as the correction setting value to the 12 blocks Br2 around the four blocks Br1.

  FIG. 16 shows an image obtained when the correction setting value is assigned to each block Br as shown in FIG. 15 and the image data corresponding to each block Br is corrected using the assigned correction setting value. An example is shown. A region corresponding to the block Br1 shown in FIG. 15 is a region Ar1 shown in FIG. 16, and a region corresponding to the block Br2 shown in FIG. 15 is a region Ar2 shown in FIG. A region corresponding to the block Br shown in FIG. 15 is a region Ar shown in FIG. When correction is performed using “255” as the area correction setting value, the input / output difference value is always “−1” regardless of the input digital data, as shown in FIG. A step in brightness may occur at the boundary with the region Ar2. When the block Br is composed of a plurality of pixels and the correction setting values of the plurality of pixels included in each block Br are not the same, and a correction setting value is assigned to each pixel, or among the plurality of pixels included in the block Br Even when a correction setting value is given to a specific pixel and a correction setting value is given to other pixels using linear interpolation, the pixel setting is the same as the boundary between the area Ar1 and the area Ar2. There may be a brightness step at the boundary. This is not limited to the correction magnification that gives a constant difference value regardless of the input digital data, but when the input digital data is corrected by another correction magnification that has a constant difference value within a certain range. Can also happen. None of Patent Documents 1 to 4 considers a problem that occurs when input digital data has a constant difference value within a certain range when data correction is performed.

  An object of the present invention is to solve a problem that occurs when input digital data has a constant difference value within a certain range when data correction is performed.

  The data correction system according to the present invention is capable of setting a plurality of types of at least one of fractional magnification and fractional magnification, and corrects the input digital data using a set magnification among the plurality of types of magnifications. The data correction means for generating corrected data, the data adjustment means for generating adjusted data by rounding down or rounding up the data representing the decimal point of the corrected data generated by the data correction means, and the data adjustment means by rounding down the data When adjusted data is generated, out of a plurality of types of magnifications that can be set in the data correction unit, the corrected data of the corrected data by the data correction unit is used by using a magnification that is one higher than the magnification set in the data correction unit. Adjusted data obtained when adjusted data is generated by the generation and data adjustment means Data adjustment is performed on first integer data representing a first integer value equal to or less than an absolute value of a first output difference value represented by the first output difference data and adjusted data generated by the data adjustment means. When adjusted data is randomly added to the adjusted data generated by the means and the adjusted data is generated by rounding up in the data adjusting means, among the multiple types of magnifications that can be set in the data correcting means, the data correcting means The adjusted data obtained when the corrected data is generated by the data correcting means and the adjusted data is generated by the data adjusting means using the magnification that is one lower than the set magnification, and generated by the data adjusting means Second integer data representing a second integer value equal to or smaller than the absolute value of the second output difference value represented by the adjusted output data and the second output difference data , Characterized in that it comprises an integer data subtraction means for subtracting the randomly adjusted data generated by the data adjusting means.

  The present invention also provides a method for controlling the data correction system. That is, in this method, the data correction means can set a plurality of types of magnifications of at least one of a fractional multiple and a fractional multiple, and input digital data using a set magnification among the multiple types of magnifications. The data adjustment means generates adjusted data by rounding down or rounding up data representing the decimal point of the corrected data generated by the data correction means, and the integer data adjustment means When adjusted data is generated by truncation in the data adjustment unit, data is obtained using a magnification that is one higher than the magnification set in the data correction unit among a plurality of types of magnifications that can be set in the data correction unit. The adjusted data obtained when the corrected data is generated by the correcting means and the adjusted data is generated by the data adjusting means. First integer data representing a first integer value less than or equal to the absolute value of the first output difference value represented by the first output difference data of the adjusted data generated by the data adjustment means, When adjusted data is randomly added to the adjusted data generated by the data adjusting means and the adjusted data is generated by rounding up the data adjusting means, the data correction is selected from the multiple types of magnifications that can be set in the data correcting means Adjusted data obtained when the corrected data is generated by the data correcting means and the adjusted data is generated by the data adjusting means using a magnification one lower than the magnification set in the means, and the data adjusting means And a second integer value representing a second integer value less than or equal to the absolute value of the second output difference value represented by the second output difference data. The data randomly is subtracted from the adjusted data generated by the data adjusting means.

  For example, the integer data adding / subtracting means is configured such that the input / output difference value represented by the input / output difference data between the digital data input to the data correcting means and the adjusted data generated by the data adjusting means is input to the data correcting means. Random addition of the first integer data by the integer data adding / subtracting means with respect to adjusted data generated from the corrected data generated using a constant magnification regardless of the value represented by the input digital data Random subtraction of the second integer data is performed.

  For example, the first integer value represented by the first integer data is equal to the first output difference value represented by the first output difference data, or the second integer data represented by the second integer data. The integer value is equal to the second output difference value represented by the second output difference data.

  If the first integer value represents a positive integer greater than or equal to 2, the first integer data representing the positive integer greater than or equal to 1 or 2 is randomly added to the adjusted data to obtain the second integer. When the numerical value represents a positive integer value of 2 or more, second integer data representing 1 or a positive integer of 2 or more may be randomly subtracted from the adjusted data.

  The digital data input to the data correction means is, for example, digital image data representing pixels constituting the image, and the integer data adjusting means uses a magnification different from that used for the digital image data representing adjacent pixels. Then, the first integer data is randomly added by the integer data adding / subtracting means or the second integer data is randomly subtracted with respect to the adjusted data generated by the data adjusting means and the adjusted data generated by the data adjusting means. It may be.

  The integer data adjustment means may include integer data calculation means for calculating at least one of the first integer data and the second integer data. In this case, the first integer data calculated by the integer data calculating unit is randomly added to the adjusted data generated by the data adjusting unit, and the second integer data calculated by the integer data calculating unit is added. , It may be randomly subtracted from the adjusted data generated by the data adjustment means.

  The digital data input to the data correction means is, for example, digital image data representing pixels constituting the image. In this case, the magnification used in the data correction means is determined according to the position of the pixel represented by the digital image data on the image.

  The digital data input to the data correction means is, for example, digital image data output from a solid-state electronic imaging device by imaging a subject.

  According to the present invention, it is possible to set at least one of fractional magnification and fractional magnification, and digital data is corrected using the set magnification among a plurality of types of magnifications to generate corrected data. The With respect to the corrected data, adjusted data is generated by truncating or rounding up data representing the decimal point.

  When adjusted data is generated by truncation, the corrected data is generated by the data correcting unit and the adjusted data is generated by the data adjusting unit using a magnification that is one higher than the magnification set in the data correcting unit. A first adjustment less than the absolute value of the first output difference value represented by the first output difference data of the adjusted data obtained by the adjustment and the adjusted data generated by the data adjustment means. First integer data representing a numerical value is randomly added to the generated adjusted data.

  When adjusted data is generated by rounding up, generation of corrected data by the data correction unit and generation of adjusted data by the data adjustment unit are performed using a magnification that is one lower than the magnification set in the data correction unit. A second adjustment less than the absolute value of the second output difference value represented by the second output difference data of the adjusted data obtained by the adjustment and the adjusted data generated by the data adjustment means. Second integer data representing a numerical value is randomly subtracted from the generated adjusted data.

  Even if the input / output data between the digital data input to the data correction means and the generated adjusted data has a constant difference value, the first integer data is randomly included in the adjusted data. Since the second integer data is subtracted from the added or adjusted data, it is possible to prevent a clear step from occurring in the image portion as in the case where the corrected digital data represents an image.

It is a block diagram which shows the electric constitution of a digital camera. It is a flowchart which shows the process sequence of a data correction system. It is a flowchart which shows the process sequence of a data correction system. The relationship between input digital data, correction set value, correction magnification, and output data is shown. It is a flowchart which shows the process sequence of a data correction system. It is a flowchart which shows the process sequence of a data correction system. A part of pixels constituting an image is shown. It is a flowchart which shows the process sequence of a data correction system. It is an example of an image. It is a flowchart which shows the process sequence of a data correction system. The relationship between input digital data and input / output differential values is shown. It shows the relationship between input digital data, correction setting value, correction magnification, and adjusted data. It shows the relationship between input digital data, correction setting value, correction magnification, and adjusted data. The relationship between input digital data and input / output differential values is shown. A state in which a part of an image is divided into a plurality of blocks is shown. It is an example of an image.

  FIG. 1 shows an embodiment of the present invention and is a block diagram showing an electrical configuration of a digital camera 1.

  The overall operation of the digital camera 1 is controlled by the control device 2.

  The digital camera 1 is provided with a mode setting switch 3 and a shutter button 4. The mode setting switch 3 is for setting various imaging modes in the digital camera 1. Output signals from the mode setting switch 3 and the shutter button 4 are input to the control device 2. A memory 5 is connected to the control device 2. The memory 5 stores correction setting values determined according to the positions of the pixels constituting the subject image (image) on the subject image (the correction magnification may be stored). However, the correction setting value (correction magnification) is not necessarily limited to each pixel. For example, when the subject image is divided into a plurality of blocks, a correction setting value (correction magnification) may be stored for each block.

  When the subject is imaged by the image sensor 6, an analog video signal representing the subject image is output from the image sensor 6. The analog video signal is converted into digital data (digital image data) by the analog / digital conversion circuit 7. The digital data output from the analog / digital conversion circuit 7 is corrected by the data correction system 8.

  The digital data input to the data correction system 8 is input to the data correction circuit 9. The data correction circuit 9 (data correction means) can set a plurality of types of correction magnifications (magnifications) of at least one of a fractional magnification and a fractional magnification, and uses a set correction magnification among the plurality of types of correction magnifications. , A circuit for correcting the input digital data and generating corrected data. As shown in FIG. 12, for example, 256 types of correction setting values can be set in the data correction circuit 9, and 256 types of correction magnifications corresponding to these 256 types of correction setting values are 1 or less. It can be set. 256 or more correction magnifications corresponding to 256 or more correction setting values may be set in the data correction circuit 9, or a correction magnification larger than 1 may be set. In the memory 5, a correction setting value is defined for each pixel. When digital data corresponding to the specified correction setting value is input to the data correction circuit 9, the correction corresponding to the specified correction setting value is performed. The data correction circuit 9 is controlled by the control device 2 so that the digital data input to the data correction circuit 9 is corrected by the magnification.

  The corrected data generated in the data correction circuit 9 is input to the data adjustment circuit 10. The data adjustment circuit 10 (data adjustment means) is a circuit that generates adjusted data by rounding down data that represents the decimal point of the corrected data generated by the data correction circuit 9 (may be rounded up or rounded off). It is. As shown in FIG. 12, when the input digital data (value represented by) is “100” and the correction setting value is “255”, the correction magnification is “0.996”. When the input digital data “100” is corrected with the correction magnification “0.996”, the calculated value becomes “99.6”, but the calculated value “99.6” is output from the data adjusting circuit 10 by being truncated in the data adjusting circuit 10 The adjusted data (output data) is “99”.

  The adjusted data output from the data adjustment circuit 10 is input to the integer data adjustment circuit 11. The integer data addition / subtraction circuit 11 is a circuit that randomly adds (or subtracts) the integer data generated by the integer data calculation circuit 12 to the input adjusted data. Randomly adding (or subtracting) integer data to adjusted data is not randomly adding (or subtracting) integer data to adjusted data, but randomly adding integer data to adjusted data (or Subtraction).

  When the corrected data after the decimal point is discarded in the data adjustment circuit 10, the integer data calculation circuit 12 is one step higher than the magnification used for the corrected data before the adjustment data is generated by the data adjustment circuit 10. The adjusted data obtained when the corrected data is generated by the data correction circuit 9 and the adjusted data is generated by the data adjustment circuit 10 using the correction magnification, and the adjusted data generated by the data adjustment circuit 10 And a first integer value less than or equal to the first output difference value represented by the first output difference data. As shown in Figure 12, the input digital data is “100”, the correction setting value is “255”, the correction magnification is “0.996”, the corrected data is “99.6”, and the decimal part is rounded down. The adjusted data becomes “99”. The corrected data “100” is generated by the data correction circuit 9 using the magnification “1.000” that is one higher than the magnification “0.996” used for the corrected data “99.6” before the generation of the adjusted data “99”. The first difference represented by the first difference data between the adjusted data “100” obtained when the adjusted data “100” is generated by the data adjustment circuit 10 and the adjusted data “99”. First integer data representing “1”, which is a first integer value equal to or smaller than the absolute value of the value, is calculated by the integer data calculation circuit 12. The first integer data calculated by the integer data calculation circuit 12 is given to the integer data adjustment circuit 11 as described above and added to the adjusted data output from the data adjustment circuit 10. When the corrected data after the decimal point is rounded up in the data adjustment circuit 10, the integer data calculation circuit 12 is one step below the correction magnification used for the corrected data before the adjustment data is generated by the data adjustment circuit 10. The adjusted data obtained when the corrected data is generated by the data correction circuit 9 and the adjusted data is generated by the data adjustment circuit 10 using the magnification, and the adjusted data generated by the data adjustment circuit 10 The second integer value equal to or smaller than the second output difference value represented by the second output difference data is calculated.

  As shown in FIG. 14, when the correction magnification is “0.996”, the first output difference value is “1” regardless of the input digital data, and will be described with reference to FIGS. As described above, there may be a brightness step between the area Ar1 and the area Ar2. As in this embodiment, the first integer data is randomly added to the adjusted data (subtraction of the second integer data), thereby preventing a brightness step from occurring.

  The adjusted data output from the integer data add / subtract circuit 11 becomes the output of the data correction system 8 and is input to the signal processing circuit 13. In the signal processing circuit 13, predetermined signal processing is performed on the adjusted data. The adjusted data output from the signal processing circuit 13 is input to the display control circuit 14, and the display control circuit 14 controls the display device 15. A subject image obtained by imaging is displayed on the display screen of the display device 15.

  When the shutter button 4 is pressed, the adjusted data output from the signal processing circuit 13 is input to the recording control circuit 16 as described above. In the recording control circuit 16, the adjusted data is recorded on the memory card 17.

  2 and 3 are flowcharts showing the processing procedure of the data correction system 8.

  Digital data is input to a data correction circuit 9 included in the data correction system 8. A correction set value corresponding to the position of the pixel on the subject image represented by the digital data input to the data correction circuit 9 is read from the memory 5 (step 21). A correction magnification corresponding to the read correction setting value is set in the data correction circuit 9 by the control device 2. When the correction magnification corresponding to the pixel position on the subject image is stored in the memory 5, the correction magnification read out from the memory 5 may be set in the data correction circuit 9. Using the correction magnification set in the data correction circuit 9, the digital data input to the data correction circuit 9 is corrected, and corrected data is generated in the data correction circuit 9 (data correction means) (step 22).

  In the corrected data generated in the data correction circuit 9, data representing the decimal point is rounded down (may be rounded up) in the data adjustment circuit 10, and adjusted data is generated in the data adjustment circuit 10 (step 23). . Whether the adjusted data is generated by rounding down or the adjusted data is generated by rounding up is set in the data adjustment circuit 10 in advance. As described above, if the input digital data is “100”, the correction setting value is “255”, and the correction magnification is “0.996”, the corrected data will be “99.6”, and the data after the decimal point will be truncated. , The adjusted data (value represented by) is “99”.

  When adjusted data is generated, the control device 2 determines whether adjusted data is generated by rounding down or adjusted data is generated by rounding up.

  When adjusted data is generated by truncation (YES in step 24), first integer data is calculated by the integer data calculation circuit 12 (integer data calculation means). The first integer data is generated by the data correction circuit 9 using a magnification that is one higher than the magnification set in the data correction circuit 9 among a plurality of types of correction magnifications that can be set in the data correction circuit. And the first output difference data of the adjusted data obtained when the adjusted data is generated by the data adjusting circuit 10 and the adjusted data actually generated by the data adjusting circuit 10 It represents a first integer value that is less than or equal to the absolute value of the first output difference value. As described with reference to FIGS. 12 and 13, when the correction setting value is “255” and the correction magnification set in the data correction circuit 9 is “0.996”, the set correction magnification “0.996” The next higher magnification is “1.000”. The adjusted data when the corrected data is generated by the data correction circuit 9 and the adjusted data is generated by the data adjustment circuit 10 using the magnification “1.000” which is one higher than that is “100”. Since the adjusted data obtained when the correction magnification is set to “0.996” is “99”, the first output difference value represented by the first output difference data is obtained from the adjusted data “100”. The difference from the adjusted data “99” is “1”. Since the absolute value of the first output difference value “1” is “1”, the first integer value equal to or smaller than the absolute value “1” is also “1”. The first integer data representing the first integer value “1” calculated in this way is randomly added to the adjusted data (for example, “99”) (step 26).

  When the input digital data is “100” and the correction magnification is “0.996”, the adjusted data is “99”, and when the input digital data is “100” and the correction magnification is “1.000” The completed data is “100” and the first output difference value is always “1”, but when the adjusted data is “99”, the first integer representing the first integer value “1” is displayed. Since the integer data is randomly added to the adjusted data “99”, it is possible to prevent a step from occurring as described with reference to FIG.

  When adjusted data is generated by rounding up (NO in step 24, YES in step 27), second integer data is calculated by the integer data calculating circuit 12 (integer data calculating means) (step 28). The second integer data is generated by the data correction circuit 9 using a magnification that is one lower than the magnification set in the data correction circuit 9 among a plurality of types of correction magnifications that can be set in the data correction circuit. And the second output difference data of the adjusted data obtained when the adjusted data is generated by the data adjusting circuit 10 and the adjusted data actually generated by the data adjusting circuit 10 It represents a second integer value that is less than or equal to the absolute value of the second output difference value.

  FIG. 4 shows the relationship between the input digital data, the correction set value, the correction magnification, and the adjusted data.

  FIG. 4 shows 512 types of correction setting values. The data correction circuit 9 can set 512 types of correction setting values. The adjusted data is obtained by rounding up the data after the decimal point of the corrected data obtained by correcting the input digital data.

  If the correction setting value is “257” and the correction magnification set in the data correction circuit 9 is “1.004”, the magnification just below the set correction magnification “1.004” is “1.000”. The adjusted data when the corrected data is generated by the data correction circuit 9 and the adjusted data is generated by the data adjustment circuit 10 using the lower magnification “1.000” is “100”. Since the adjusted data obtained when the correction magnification is set to “1.004” is “101”, the second output difference value represented by the second output difference data is the adjusted data “101”. The difference from the adjusted data “100” is “1”. Since the absolute value of “1” that is the second output difference value is “1”, the second integer value equal to or smaller than the absolute value “1” is also “1”. The second integer data representing the second integer value “1” calculated in this way is randomly subtracted from the adjusted data (for example, “101”) (step 29).

  When the input digital data is “101” and the correction magnification is “1.004”, the adjusted data is “101”, the adjustment is when the input digital data is “100” and the correction magnification is “1.000”. The completed data is “100” and the second output difference value is always “1”. However, when the adjusted data is “101”, the second integer value “1” representing the second integer value “1” is displayed. Since the integer data is randomly subtracted from the adjusted data “101”, even if the adjusted data is generated by rounding up, it is possible to prevent the occurrence of a step as described with reference to FIG. The

  FIG. 5 shows another embodiment and is a flowchart showing a part of the processing procedure of the data correction system 8. The processing procedure in FIG. 5 corresponds to the processing procedure in FIG.

  The correction setting value stored in correspondence with the position on the subject image (image) of the pixel represented by the digital data input to the data correction circuit 9 is read from the memory 5 (step 31). A correction magnification corresponding to the read correction setting value is set in the data correction circuit 9, and the input digital data is corrected using the set magnification to generate corrected data (step 32). The data after the decimal point of the generated corrected data is rounded down (or rounded up), so that adjusted data is generated in the data adjustment circuit 10 (step 33).

  In the processing procedure shown in FIG. 5, the input / output difference value represented by the input / output difference data between the digital data input to the data correction circuit 9 and the adjusted data output from the data adjustment circuit 10 is input to the data correction circuit 9. It is judged by the control device 2 whether or not a correction magnification that is constant regardless of the value represented by the input digital data is used (step 34). When a correction magnification that makes the input difference value constant (for example, correction magnification “0.996” shown in FIG. 12) is used (YES in step 34), the processing proceeds to the processing shown in FIG. Is added to the adjusted data or the second integer data is subtracted from the adjusted data.

  FIG. 6 is a flowchart showing the processing procedure of the data correction system 8 according to another embodiment. The processing procedure of FIG. 6 corresponds to the processing procedure shown in FIGS.

  The set correction magnification is read from the memory 5 (step 41), and the correction magnification is set in the data correction circuit 9. Using the set magnification, the input digital data is corrected to generate corrected data (step 42). Adjusted data is generated by truncating (rounding up) the data representing the decimal point of the corrected data (step 43).

  The control device 2 determines whether or not the generated adjusted data is adjusted data obtained from a correction magnification different from the correction magnification of the adjacent pixel (step 44).

  FIG. 7 shows a part of the subject image.

  A part of the subject image is composed of 64 pixels P1 to P64 of 8 pixels × 8 pixels. Each of the pixels P1 to P64 also shows a correction magnification when digital data representing each of the pixels P1 to P64 is corrected in the data correction circuit 9. Of these pixels P1 to P64, taking the pixels P26 to P28, the correction magnification of the digital data representing each of the pixels P26 to P28 is “0.996”. The correction magnification of the adjacent pixel P25 on the left side of the pixel P26 is “0.992”, and the correction magnification of the adjacent pixel P29 on the right side of the pixel P28 is “1.000”. In this embodiment, like the pixels P26 and P28, correction by the data correction circuit 9 is performed using a correction magnification different from that used for digital data (digital image data) representing adjacent pixels. For the adjusted data generated by the data adjustment circuit 10, the integer data addition / subtraction circuit 11 performs random addition of the first integer data or random subtraction of the second integer data. When the correction magnifications of the adjacent pixels P26 and P28 are the same as in the pixel P27, random addition of the first integer data by the integer data adding / subtracting circuit 11 or adjustment of the second integer data for the adjusted data representing the pixel P27 Random subtraction is not performed.

  Returning to FIG. 6, when the generated adjusted data is adjusted data obtained from a correction magnification different from the correction magnification of the adjacent pixel (YES in step 44), the input / output difference value is constant. When the correction magnification is used (YES in step 45), addition of the first integer data or subtraction of the second integer data shown in FIG. 3 is performed. However, even when the correction magnification with a constant input / output difference value is not used, the generated adjusted data is adjusted data obtained from a correction magnification different from the correction magnification of the adjacent pixel. In this case, addition of the first integer data or subtraction of the second integer data shown in FIG. 3 may be performed.

  FIG. 8 shows still another embodiment and is a flowchart showing a part of the processing procedure of the data correction system 8. The processing procedure shown in FIG. 8 corresponds to FIG. 2, FIG. 5, and FIG.

  The set correction magnification is read from the memory 5 (step 51), and the correction magnification is set in the data correction circuit 9. The digital data is corrected using the set magnification to generate corrected data (step 52). Adjusted data is generated by truncating (rounding up) the data representing the decimal point of the corrected data (step 53).

  Subsequently, the control device 2 determines whether or not the generated adjusted data is at the adjustment target position (step 54).

  FIG. 9 is an example of a subject image 60 captured by the image sensor 6.

  The adjusted data generated based on the digital data representing the peripheral edge 61 (indicated by hatching) of the subject image 60 is set to the adjustment target position. The adjusted data generated based on the digital data representing the portion other than the peripheral edge portion 61 may be set at the adjustment target position.

  If it is determined that the adjusted data of the adjustment target position (YES in step 54), and the correction magnification that makes the input / output difference value constant is used (YES in step 55), the first data shown in FIG. Addition of integer data or subtraction of second integer data is performed. However, even when the correction magnification with which the input / output difference value is constant is not used, in the case of adjusted data at the position to be adjusted, the addition of the first integer data shown in FIG. Subtraction of integer data may be performed.

  Furthermore, the correction processing in the data correction system 8 may be performed only for digital data representing the peripheral portion 61 (or digital data representing a portion excluding the peripheral portion 61).

  FIG. 10 shows still another embodiment and is a flowchart showing a part of the processing procedure of the data correction system 8. The processing procedure shown in FIG. 10 corresponds to FIG. 2, FIG. 5, FIG. 6, and FIG.

  The set correction magnification is read from the memory 5 (step 71), and the correction magnification is set in the data correction circuit 9. Using the set magnification, the digital data is corrected and corrected data is generated (step 72). Adjusted data is generated by truncating (rounding up) the data representing the decimal point of the corrected data (step 73).

  Subsequently, the control device 2 determines whether or not the generated adjusted data is generated from digital data having a level to be adjusted (step 74).

  FIG. 11 corresponds to FIG. 14 and shows the relationship between input digital data and input / output differential values.

  Graphs G1, G2, G3, and G4 show cases where the correction magnifications are “1.000”, “0.996”, “0.992”, and “0.988”, respectively. In the graph G2, since the correction magnification is “0.996”, the input / output difference value is always “−1” regardless of the value of the input digital data. In the graph G3, the correction magnification is “0.992”, and the input / output differential value is “−1” until the input digital data is up to the threshold Th2, but the input / output differential value is “−” above the threshold Th2. 2 ”. In the graph G4, the input / output difference value is “−1” until the threshold Th1, but the input / output difference value is “−2” from the threshold Th1 to Th3, and the input / output difference is greater than the threshold Th3. The difference value is “−3”.

  In this embodiment, as represented by the graph G2, when the correction magnification is set to “0.996”, it is determined that all digital data has a level to be adjusted (step 64). YES), the first integer data is added to the adjusted data, or the second integer data is subtracted from the adjusted data. As represented by the graph G3, when the correction magnification is set to “0.992,” it is determined that digital data having a threshold value Th2 or higher has a level to be adjusted. As shown in the graph G4, when the correction magnification is set to “0.988”, digital data from the threshold value Th1 to Th2 and digital data equal to or higher than the threshold value Th3 are subject to adjustment. It is judged to have a level.

  As described above, as shown in FIG. 3, addition of the first integer data or subtraction of the second integer data is performed on the adjusted data generated from the digital data having the level to be adjusted. May be.

  In the above-described embodiment, digital image data obtained by imaging a subject using the image sensor 6 is digital data input to the data correction system 8. However, the present invention is not limited to digital image data. The same processing can be performed with the digital data.

  In the above embodiment, the first integer value “1” is equal to the first difference value “1”, and the second integer value “1” is also equal to the second difference value “1”. When the first integer value represents a positive integer of 2 or more, integer data representing a positive integer of 1 or 2 may be randomly added to the adjusted data, or the second integer When the numerical value represents a positive integer of 2 or more, integer data representing a positive integer of 1 or 2 may be randomly subtracted from the adjusted data.

  Further, in the above-described embodiment, the digital data is fractional-multiplied in the data correction circuit 9 (decimal numbers include pure decimals and banded decimals), but fractional multiples (fractions include true fractions, (Including over-fraction and mixed-number).

  Further, in the above-described embodiment, the data after the decimal point of the corrected data is rounded down or rounded up in the data adjustment circuit 10, but the data after the decimal point of the corrected data may be rounded off. When the data after the decimal point of the corrected data is rounded off, either the random addition of the first integer data or the random subtraction of the second integer data may be performed on the adjusted data.

DESCRIPTION OF SYMBOLS 1 Digital camera, 2 Control apparatus, 3 Mode setting switch, 4 Shutter button, 5 Memory, 6 Image sensor, 7 Digital conversion circuit, 8 Data correction system, 9 Data correction circuit, 10 Data adjustment circuit, 11 Integer data adjustment Circuit, 12 integer data calculation circuit, 13 signal processing circuit, 14 display control circuit, 15 display device, 16 recording control circuit, 17 memory card, 60 subject image, 61 peripheral edge, Ar area, Ar1 area, Ar2 area, Br Block, Br1 block, Br2 block, G1-G4 graph, P1-P64 pixel, Th1-Th3 threshold

Claims (9)

Multiple types of magnifications can be set for at least one of fractional magnification and fractional magnification. Data that generates corrected data by correcting the input digital data using the set magnification among the multiple magnifications Correction means,
Data adjustment means for generating adjusted data by rounding down or rounding up data representing the decimal point of the corrected data generated by the data correction means, and when adjusted data is generated by the data truncation in the data adjustment means The generation of corrected data by the data correction unit and the data adjustment using a magnification that is one higher than the magnification set in the data correction unit among a plurality of types of magnifications that can be set in the data correction unit. The first output difference value represented by the first output difference data of the adjusted data obtained when the adjusted data is generated by the means and the adjusted data generated by the data adjusting means The first integer data representing the first integer value less than or equal to the absolute value of is generated by the data adjusting means. When the adjusted data is randomly added to the adjusted data and the adjusted data is generated by the round-up in the data adjusting means, the data correcting means out of a plurality of magnifications that can be set in the data correcting means The adjusted data obtained when the corrected data is generated by the data correcting unit and the adjusted data is generated by the data adjusting unit using a magnification that is one lower than the magnification set in the above, and the data The second integer data representing the second integer value equal to or smaller than the absolute value of the second output difference value represented by the second output difference data and the adjusted data generated by the adjusting means is the data adjustment Integer data addition / subtraction means for randomly subtracting from the adjusted data generated by the means,
Data correction system with The integer data adjustment means is
The input / output difference value represented by the input / output difference data between the digital data input to the data correction means and the adjusted data generated by the data adjustment means is the digital data input to the data correction means. Random addition of the first integer data by the integer data adding / subtracting means or the second integer with respect to the adjusted data generated from the corrected data generated using a constant magnification regardless of the value represented by Random subtraction of data,
The data correction system according to claim 1. The first integer value represented by the first integer data is equal to the first output difference value represented by the first output difference data, or the second integer data represented by the second integer data. Is equal to the second output difference value represented by the second output difference data,
The data correction system according to claim 1 or 2. When the first integer value represents a positive integer of 2 or more, first integer data representing a positive integer of 1 or 2 is randomly added to the adjusted data;
When the second integer value represents a positive integer value of 2 or more, the second integer data representing a positive integer of 1 or 2 is randomly subtracted from the adjusted data.
The data correction system according to claim 1 or 2. The digital data input to the data correction means is digital image data representing pixels constituting an image,
The integer data adjustment means is
Correction by the data correction unit is performed using a magnification different from the magnification used for the digital image data representing adjacent pixels, and the adjusted data generated by the data adjustment unit is subjected to the second calculation by the integer data addition / subtraction unit. Random addition of integer data of 1 or random subtraction of second integer data,
The data correction system according to any one of claims 1 to 4. The integer data adjustment means is
An integer data calculating means for calculating at least one of the first integer data and the second integer data;
The first integer data calculated by the integer data calculating means is randomly added to the adjusted data generated by the data adjusting means, and the second integer data calculated by the integer data calculating means is , Subtract randomly from the adjusted data generated by the data adjustment means,
The data correction system according to any one of claims 1 to 5. The digital data input to the data correction means is digital image data representing pixels constituting an image,
The magnification used in the data correction means is determined according to the position of the pixel represented by the digital image data on the image.
The data correction system according to any one of claims 1 to 6. The digital data input to the data correction means is digital image data output from a solid-state electronic imaging device by imaging a subject.
The data correction system according to any one of claims 1 to 7. The data correction means can set multiple types of magnifications, at least one of fractional and fractional multiples, and has been corrected by correcting the input digital data using the set magnification among the multiple types of magnifications Generate data,
The data adjustment unit generates adjusted data by rounding down or rounding up data representing the decimal point of the corrected data generated by the data correction unit,
When the adjusted data is generated by the truncation in the data adjustment unit, the integer data adjustment unit has a magnification set in the data correction unit among a plurality of types of magnifications that can be set in the data correction unit. The adjusted data obtained when the corrected data is generated by the data correcting unit and the adjusted data is generated by the data adjusting unit using the higher magnification, and generated by the data adjusting unit. The first integer data representing the first integer value equal to or less than the absolute value of the first output difference value represented by the first output difference data and the adjusted data is adjusted by the data adjustment means. When adjusted data is randomly added to the completed data and the adjusted data is generated by the round-up in the data adjusting means, the data correcting means Generation of corrected data by the data correction unit and generation of adjusted data by the data adjustment unit using a magnification that is one lower than the magnification set in the data correction unit among a plurality of types of settable magnifications. A second value less than or equal to the absolute value of the second output difference value represented by the second output difference data of the adjusted data obtained when performed and the adjusted data generated by the data adjustment means. Randomly subtracting second integer data representing an integer value from the adjusted data generated by the data adjustment means,
Control method of data correction system.

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