JPH0740600A - Image processing device - Google Patents

Abstract

PURPOSE:To provide an image processing device for enlarging an image data of binary plus (m) color ((m) is an integer of 1 or more) without the deterioration of quality. CONSTITUTION:A manuscript data of binary plus (m) color is read by an image reading device and classified by density and color and stored in a storage memory 6. The density data and the color data are extended separately in an extending device 4, and enlarged and corrected in an image information correction circuit 8. Then, said two data are stored respectively in a density memory 9a and a color pixel memory 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing device,
In particular, image data consisting of two basic colors (for example, black and white) represented by binary values and m (m is an integer of 1 or more) other colors (hereinafter, referred to as binary plus m color) are used for arbitrary magnification. The present invention relates to an image processing device capable of performing enlargement interpolation processing.

[0002]

2. Description of the Related Art Conventionally, image information per pixel relating to a color tone of image data is represented by a coded signal of a plurality of bits, and the coded signal is converted into a binary signal to convert the image information per pixel into a single color. An image processing technique has been proposed in which it is taken out as information (Japanese Patent Laid-Open No. 54-113722).

According to this technique, if the partner machine is a color facsimile machine, the multi-bit color information is sent,
Since a monochrome facsimile machine can convert and transmit the monochrome information, the color facsimile machine and the monochrome facsimile machine can communicate with each other.

[0004]

However, in this technique, since no consideration is given to the enlargement processing of the color information, there is a problem that the image quality deteriorates when the enlargement processing is performed.

An object of the present invention is to eliminate the above-mentioned problems of the prior art and to provide an image processing apparatus capable of enlarging binary plus m color image data to an arbitrary magnification without degrading the image quality. To provide.

[0006]

In order to achieve the above object, the present invention provides a means for storing image data consisting of binary plus m colors for each of density data and color data, and each of the density data and color data. It is characterized in that it is provided with a means for performing an expansion interpolation process.

[0007]

According to the present invention, since the image data of binary plus color is subjected to the enlargement interpolation processing separately, it is possible to perform the enlargement processing to an arbitrary magnification without deteriorating the image quality.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a hardware configuration of a copying machine according to an embodiment of the present invention. Although the present embodiment will be described using a copying machine, the present invention is not limited to this. In the figure, 1 is a C for controlling the entire apparatus.
PU, 2 is a ROM in which a program for controlling the entire apparatus is stored, 3 is a compressor for compressing binary image data into coded data, 4 is an expander for reading the coded data and expanding it into binary image data, Reference numeral 5 is a panel having a display unit for displaying a message. Further, 6 is a storage memory for storing code data, 7 is a RAM used as a work area used by a control program, 8 is an image information correction circuit for enlarging / smoothing binary image data, and 9 is at least a density memory. 9
It is an image memory including a and a color pixel memory 9b. Further, 20 and 21 are switching devices for switching between the image reading device and the image recording device, 22 is an image reading device, 23 is an image recording device, and 24 is an operation display device in which operating means is arranged,
Reference numeral 25 is a system bus that connects the above-described components to each other so that data can be exchanged with each other.

Next, the operation of this embodiment will be described. When the image reading device 22 reads a document consisting of binary plus one color, for example, a document represented in black and white and red, the density information of the document is stored in the density memory 9a via the switch 20 and the color (red The information is stored in the color pixel memory 9b via the switch 21. At this time, as shown in FIG. 2, image data of 0 is stored in both memories 9a and 9b for the white information of the original, and image data of 0 is stored in the density memory 9a and color pixel memory 9b for the black information. Is stored, and further, as the red information, one image data is stored in both memories. Image memory 9
When the image data of the original document is stored in, the image data is read from both memories 9a and 9b, and compressed by the compressor 3 into coded data. The generated code data is sent to the storage memory 6 and temporarily stored.

Next, as shown in FIG. 3, the code data (density and color data) in the storage memory 6 is read in synchronization with the sync signal and sent to the decompressor 4. The decompressor 4 decompresses the sent code data and sends it to the image information correction circuit 8. The image information correction circuit 8 uses the expanded data 4
Enlargement interpolation processing is performed on a and sent to the image memory 9.
When the density information and the color (red) information which have undergone the expansion interpolation processing are accumulated in both memories 9a and 9b, these image information are sent to the image recording device 23 via the switches 20 and 21, and printed out. To be done. As a result, the image data composed of binary plus one color can be enlarged to an arbitrary magnification without significantly degrading the image quality.

In the above embodiment, an example of binary plus 1 color has been described, but the present invention is not limited to this and can be applied to binary plus m color.

Next, the structure and operation of the image information correction circuit 8 will be described in detail. FIG. 4 is a block diagram showing the configuration of a specific example of the image information correction circuit 8. In FIG. 4, reference numeral 11 is a multiplexer (MUX), which has three types of density data and color data 4a, white (“0”) data 18 and front line data 12a input from the storage memory 6 via the decompressor 4. One is selected from the data and output to the line buffer 12. This line buffer 12
(2n + 1) line buffer (n is a positive integer),
In this specific example, an example of a 7-line buffer (n = 3) is shown. The line buffer 12 stores image data of a line to be corrected and three lines before and after the line.

Reference numeral 13 is a (2n + 1) × (2n + 1) register matrix for storing pixels around the pixel of interest of the line to be corrected. In this embodiment, a register matrix of n = 3, that is, a 7 × 7 register matrix is shown, and 49 pixels around the target pixel are stored. Reference numeral 14 denotes an enlargement processing block for performing enlargement processing of k × l (k is an enlargement ratio in the main scanning direction, and 1 is an enlargement ratio in the sub-scanning direction). ing. The enlargement processing block 14 includes 1 × 1 to 6
Enlargement up to × 6 and smoothing processing can be performed.

Reference numeral 15 is a register for setting the enlargement ratio in the main scanning direction, and 16 is a register for setting the enlargement ratio in the sub-scanning direction. The control circuit 17 outputs a selection signal 17a2 for selecting the image data input to the multiplexer 11, that is, the density data and the color data 4a, the white data 18 and the previous line data 12a, and the enlargement processing block 14 enlarges. Selection signal 17b for selecting one of the rates
1 and 17c1 and designated positions 17b2 and 17c2 used during smoothing processing are output.

The preceding line data 12a is 7-bit data obtained by extracting 1-bit data for each line from the 7-line data stored in the line buffer 12. Further, 18 is the white (“0”) data.

Next, a specific example of the structure of the main part of the control circuit 17 will be described with reference to FIGS. Figure 5
Shows a control unit in the sub-scanning direction, and FIG. 6 shows a control unit in the main scanning direction. Note that the same reference numerals as those in FIG. 5 and FIG. 4 in FIG.

In FIG. 5, reference numeral 31 is a sub-scanning direction enlargement ratio work register which is cleared by the output page head signal 36 sent from the image recording device 23, and 32 is an adder.
Reference numeral 33 is a sub-scanning direction enlarged block block position counter, and 34 is a comparator.

The adder 32 adds the enlargement value preset in the sub-scanning direction enlargement ratio register 16 and the value stored in the sub-scanning direction enlargement ratio work register 31, and the integer part of the addition result is the sub-scanning direction. The enlargement block selection signal 17b1 is sent to the enlargement processing block 14 (see FIG. 4). The fractional part of the addition result is stored in the sub-scanning direction enlargement ratio work register 31.

For example, the sub-scanning direction enlargement ratio register 1
If the enlargement value preset to 6 is 4.4 times, the enlargement ratio work register 31 in the sub-scanning direction is initially cleared to 0, so the adder 32 outputs 4.4 in the first addition. However, 4 in the integer part is the enlargement block selection signal 1 in the sub-scanning direction.
It is sent to the enlargement processing block 14 as 7b1.
On the other hand, the decimal part 0.4 is stored in the sub-scanning direction enlargement ratio work register 31.

Next, since the second addition result is 4.8, the integer part 4 is the sub-scanning direction enlarged block selection signal 17
It is sent to the enlargement processing block 14 as b1 and the fractional part 0.8 is the enlargement ratio work register 31 in the sub-scanning direction.
Stored in. Thereafter, the same operation is performed, and the adder 32
The values of the integer part output from are 4, 4, 5, 4,
4, ...

Since the enlargement processing block 14 selects the enlargement block in the sub-scanning direction according to the data of the integer part, the image data is subjected to the enlargement processing of about 4.4 times on average.

Next, the structure of the control unit in the main scanning direction will be described with reference to FIG. In the figure, 51 is a main scanning direction enlargement ratio work register, 52 is an adder, 53 is a main scanning direction enlargement block block position counter, and 54 is a comparator.

Main scanning direction enlargement ratio work register 51
Is cleared by the output line head signal 37 sent from the image recording device 23. The enlargement ratio in the main scanning direction is preset in the enlargement ratio register 15 in the main scanning direction. Since the operation of the adder 52 is the same as the operation of the adder 32, the description thereof will be omitted.

Next, regarding the operation of the enlarged block in-block position counter 33 in the sub-scanning direction, the enlarged block-in-block position counter 53 in the main scanning direction, and the comparators 34 and 54 in FIGS. And explain. Reference numeral 57 in FIG. 7 shows a data example of the density data and the color data 4a temporarily stored in the register matrix 13, and 58 shows a designated position of a designated magnification.

An output line head signal 37 sent from the image recording device 23 is input to the sub scanning direction enlarged block in-block position counter 33, and one pixel is input to the main scanning direction enlarged block in-block position counter 53. The output signal 55 is input.

Now, assuming that the integer part 17c1 in the main scanning direction is "2" and the integer part 17b1 in the sub-scanning direction is "4", as shown in FIG.
Is magnified twice in the main scanning direction and four times in the sub scanning direction. The designated positions for the enlargement processing and the smoothing processing are the intra-enlargement block block internal position 17b2 and the main scanning direction enlargement block internal position 17c2 shown in FIGS.

Referring to FIG. 6, since the integer part 17c1 is "2", 2 is input to the A terminal of the comparator 54. When the one-pixel output signal 55 is input, the main scanning direction enlargement block intra-block position counter 53 counts up, and the count output is output as the main scanning direction enlargement block intra-block position 17c2. In this specific example, when the count output becomes 2, the comparator 54 outputs the coincidence signal 17a.
Since 3 is output, 0 and 1 are sequentially output as the intra-main scanning direction enlarged block block position 17c2, and the output is 0, 1 of the designated position in the main scanning direction as shown in FIG. It becomes 1.

Similarly, 0, 1, 2, 3 is output as the position 17b2 in the sub-scanning direction enlarged block block of FIG. 5, and as shown in FIG. 7, the address of the designated position in the sub-scanning direction is obtained. It becomes 0-3.

Next, the overall operation of FIG. 4 will be described with reference to FIGS. 7 and 8. First, before the enlargement process is started, the multiplexer 11 of FIG. 4 selects the white data 18, and the white data is stored in all of the 7-line buffers 12. That is, the 7-line buffer 12 is cleared.

When performing enlargement processing, the enlargement ratio register 15 in the main scanning direction and the enlargement ratio register 16 in the sub-scanning direction are described.
The enlargement ratio is set to the start signal 23a
Input to 7. Then, the multiplexer 11 sequentially reads the input image data 4a into the 7-line buffer 12 according to the input image data selection signal 17a2.

Input image data 4 in 7 line buffer 12
When a is stored for 4 lines, the enlargement process is started.
FIG. 8A shows a state in which 7 lines of image data including 3 lines of white data are stored in the 7 line buffer 12.

Immediately after the start of the operation, the sub-scanning direction enlargement ratio work register 31 is cleared by the output page head signal 36, and the main scanning direction enlargement ratio work register 51.
Is cleared by the output line head signal 37.

Next, the operation start signal is input to the adder 52 shown in FIG. Accordingly, the adder 52 adds the enlargement ratio set in the main-scanning-direction enlargement ratio register 15 and the value of the main-scanning-direction enlargement ratio work register 51, and the integer part 17 thereof.
c1 is sent to the enlargement processing block 14 as an enlargement block selection signal in the main scanning direction. The operation start signal is also input to the adder 32 shown in FIG. Accordingly, the adder 32 adds the enlargement ratio set in the sub-scanning direction enlargement ratio register 16 and the value of the sub-scanning direction enlargement ratio work register 31, and the integer part 17b1 thereof is used as the sub-scanning direction enlargement block selection signal. Send to the enlargement processing block 14.

When the enlargement processing block 14 receives the enlargement block selection signals 17b1 and 17c1 in the main and sub-scanning directions, it selects the enlargement processing block. For example, if the enlargement block selection signals in the main and sub-scanning directions are 2 and 4, respectively, the enlargement processing block 14 selects a 2 × 4 enlargement processing block.

Next, when the 1-pixel output signal 55 as shown in FIG. 9 is successively input to the main scanning direction enlarged block in-block position counter 53, the main scanning direction enlarged block in-block position 17c2. Is incremented by 0, 1, 2, and when it reaches 2, the comparator outputs the coincidence signal 17a3.

The signal 17a3 serves as a trigger signal for the adder 52 and also as a clear signal for the main scanning direction enlargement block intra-block position counter 53. Therefore, when the coincidence signal 17a3 is output, the adder 52 performs an addition operation, and the main scanning direction enlarged block intra-block position counter 53 is cleared.

On the other hand, the output line head signal 37 is input to the sub scanning direction enlarged block intra-block position counter 33 of FIG. 5, and the counter 33 counts up. The counter 33 outputs the count value as an intra-enlargement block block position 17b2 in the sub-scanning direction and an adder 34
It is cleared by the coincidence signal 17a2 from. Comparator 3
The coincidence signal 17a2 of 4 becomes a trigger signal of the adder 32.

The coincidence signal 17a3 of the comparator 54 is the 7-line buffer 12 and the register matrix 1
It is also input to 3. Then, the 7 line buffer 1
2 shifts each 1 bit for 7 lines in parallel. By this shift, the 7-bit data 12a is moved to the beginning of the 7-line buffer 12 through the multiplexer 1.
The state at this time is shown in FIG.

Simultaneously with the above operation, new 7-bit data is taken into the register matrix 13 and old 7-bit data is erased. This state is shown in FIG.
It is shown in (b). As a result, the pixel of interest is changed from d4 to d5.

When the above operation is repeated and the processing for one line is completed, the multiplexer 11 shown in FIG.
The selection signal 17a2 is input to. When the selection signal 17a2 is input, the multiplexer 11 selects the input image data 4a for a certain period. As a result, the input image data 4a is loaded into the 7-line buffer 12 for one line. At this time, the oldest one line of image data in the 7 line buffer 12 is erased. This state is shown in FIG.
It is shown in (d).

Next, the expansion interpolation processing applied in the present invention will be described. FIG. 10 is a schematic block diagram of the enlarged interpolation processing device. Reference numeral 61 is a (1 + 2n) × (1 + 2n) (n is a positive integer) register matrix having a target pixel 61a in the center, and 62 is a pixel around the target pixel 61a. A pattern detection unit for detecting a pixel pattern, and 63 is an enlargement / smoothing processing unit for performing enlargement processing corresponding to the enlargement ratio in the main / sub-scanning direction and smoothing processing corresponding to the pattern.

The enlargement / smoothing processing unit 63 receives the enlargement factors 17c1 and 17b1 in the main / sub-scanning direction and the enlargement / in-block directions 17c2 and 17b2 in the main / sub-scanning direction. The enlarging / smoothing processing unit 63 determines the pixel of interest 61a.
Is enlarged to a size corresponding to the enlargement factors 17c1 and 17b1, and each position of the enlarged pixels, that is, the pixel designated by the positions 17c2 and 17b2 is interpolated or not interpolated. Make a decision.

For example, when the enlargement factors 17c1 and 17b1 are 2 and 4, respectively (that is, a magnification of 2.times.4), as shown in FIGS. 11A to 11E, the pixel of interest 61a is selected. Is enlarged by 2 × 4 times, and it is determined whether or not to interpolate for each of the eight pixels generated by this enlargement. The technical meaning of FIG. 11 will be described later in detail.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

In step S1, the pattern detection unit 62 determines that the connection pattern of the peripheral black pixels of the target pixel 61a is 1: 1.
It is detected whether or not it is one of the four directions. If this determination is negative, the process proceeds to step S2 and the pixel of interest 61
It is detected whether the connection pattern of the peripheral black pixels of a is in any one of the eight directions of 1: 2. Also, step S3
Then, the connection pattern of the black pixels around the attention pixel 61a is
It is detected whether or not the direction is one of eight directions of 1 to n (n = 3, 4, ...).

That is, if the connection pattern of the peripheral black pixels of the target pixel 61a belongs to, for example, the patterns of (a) to (e) of FIG. 11, any of the steps S1 to S3 becomes affirmative, and the process proceeds to step S5. move on. Note that the pattern shown in FIG. 11 is only an example, and it is clear that there are many similar patterns.

When all of the above steps S1 to S3 are negative, the process proceeds to step S4 and it is determined that the interpolation is not performed.
Then, the process proceeds to step S8, and it is determined whether or not all the positions of the designated magnification of one target pixel have been processed.

On the other hand, when any of the steps S1 to S3 is affirmative, the process proceeds to step S5, and the designated position (17c1, 17b1, 17c2, 17b) of the designated magnification is set.
In 2), determine whether interpolation is necessary.
First, it is determined whether or not interpolation at the designated position (0,0) (see 58 in FIG. 7) is necessary. If this determination is negative,
The process proceeds to step S6 and the process of not interpolating is performed. On the contrary, if the determination is affirmative, the process proceeds to step S7 and the process of interpolation is performed.

Next, in step S8, it is determined whether or not all the positions of one pixel of interest have been interpolated. If this determination is negative, the process proceeds to step S9 and the position is counted up. , The next designated position (0, 1) is designated. Then, returning to the determination in steps S1 to S3, it is determined again in step S5 whether or not the interpolation of the designated position (0, 1) is necessary. When the above process is repeated and the determination in step S8 is affirmative, step S1
The process proceeds to 0, and it is determined whether or not all the processing of the input pixel data has been completed. When this determination is negative, the process proceeds to step S11, the pixel of interest is moved to the next pixel of interest,
The same process as above is repeated.

As a result of repeating the above processing, if the determination in step S10 becomes affirmative, the enlarging / smoothing processing is terminated. In the process of step S5, interpolation is performed according to the designated magnification, the designated position, and the connection pattern.
It is executed by an algorithm that decides not to. The description of the specific contents of this algorithm is omitted.

According to this embodiment, when the peripheral pixels of the target pixel correspond to, for example, the patterns of (a) to (e) in FIG. 11, the designated position of the target pixel 61a is shaded. Will be interpolated. Therefore, the diagonal portion of the image data is smoothed, and the quality of figures such as characters can be improved.

Next, the operation of the second enlargement / smoothing process will be described.
This will be described with reference to the flowchart of FIG.

In step S11, the same processing as in steps S1 to S3 in FIG. 12 is performed, that is, the peripheral pixels of the target pixel are one-to-one four-direction black pixel connection patterns or one-to-two.
8 direction black pixel connection pattern, ..., or 1 to n
It is detected whether the black pixel connection pattern is in the eight directions. Also,
The processes of steps S12, S13, S14, and S15 are the same as the processes of steps S4, S5, S6, and S7 of FIG.

When the process proceeds to step S16, the peripheral pixels of the target pixel are one-to-one four-direction white pixel connection pattern, one-to-two eight-direction white pixel connection pattern, ... Or one-to-n eight. It is detected whether the white pixel connection pattern in the direction.

When the determination in step S16 is negative, the process proceeds to step S17, and the pixel of interest is not deleted at all, and the process proceeds to step S21. On the other hand, if the result at step S16 is affirmative, then the processing advances to step S18, at which the designated position (1
7c1, 17b1, 17c2, 17b2), it is judged whether or not it is necessary to delete. Then, if this determination is negative, the process proceeds to step S19, and the process of not deleting is performed, and if the determination is affirmative, step S20 is performed.
Then, the process of deleting is performed.

Next, in step S21, it is determined whether or not all positions of the designated magnification of one target pixel have been processed. If the determination is negative, step S22
Proceeding to step, the designated position is counted up.
Then, the process returns to step S11 and the above process is repeated.

When the above processing is repeated and all the processing at the designated position is completed, the affirmative answer is obtained in step S21 and the operation proceeds to step S23.

Now, the operation of steps S16 to S20 until step S21 becomes affirmative will be described with reference to FIG.

As shown in FIG. 14 (a), when the peripheral pixels for the target pixel 61a are one-to-one connected white pixels, the pixel at the position (0,0) is deleted. Also, the same figure
In the case of white pixel connection in (b), positions (0,0) and (0,
The pixel of 1) is deleted. In addition, (c), (d), (e)
In this case, the pixels at the positions shown in the figure are deleted.

The process of step S18 is executed by an algorithm for deciding whether to delete or not depending on the designated magnification, the designated position and the connection pattern.
The description of the specific contents of this algorithm is omitted.

According to the present embodiment, by deleting the pixels, the corners of the oblique portion of the character or the like can be removed and smoothed, and the thickened line by the interpolation processing of steps S11 to S15 can be removed from steps S16 to S15. It can be finely corrected by the process of S20. Therefore, high-quality graphic data such as characters can be provided.

Next, the third enlargement / smoothing process will be described with reference to FIG.
This will be described with reference to the flowchart in FIG. The feature of this embodiment lies in that in the second enlargement / smoothing process, step S31 is performed.
The feature is that S34 to S34 are added, and the other steps are the same as those of the second enlargement / smoothing process.
Only 1 to S34 will be described.

In step S31, one to one to one black pixels
It is determined whether the connection of the pair n is a pattern that deteriorates the image. Then, if it is a pattern that deteriorates the image image, the process proceeds to step S16 without interpolation (step S32). On the other hand, when step S31 is negative, the process proceeds to step S13.

For example, as shown in FIG. 16A, when the reference pixel of the pixel of interest 61a has a black 3 × 3 connection pattern, the other peripheral pixels, that is, the pixels 61b, 61c and 61d are selected. See also, if these pixels 61b, 61c, and 61d are all white pixels, the pixel of interest 61a is interpolated. That is, the process proceeds from step S31 to S13.

On the other hand, for example, as shown in FIG. 16 (b), if any one of the pixels 61b, 61c and 61d is a black pixel, the interpolation of the pixel of interest 61a is not performed. To That is, the process proceeds from step S31 to S32. This is because if the interpolation is performed, the white pixel of the target pixel 61a is crushed and the image is deteriorated.

In step S33, one to one to one of the white pixels
It is determined whether the connection of the pair n is a pattern that deteriorates the image. If it is a pattern that deteriorates the image image, the pattern is not deleted (step S34) and the process proceeds to step S21. On the other hand, when step S33 is negative, the process proceeds to step S18.

For example, as shown in FIG. 16C, when the reference pixel of the pixel of interest 61a has a white 2 × 2 connection pattern, the peripheral pixels 61b to 61d other than those pixels are referred to.
If all are white pixels, the process proceeds to step S21 without deleting black pixels. This is to prevent the isolated black pixels from disappearing. The pixels 61b to 6
If any one of 1d is a black pixel, the process of step S18 is performed.

According to the third enlargement / smoothing process, it is possible to prevent the crushing of the white pixels and the disappearance of the black pixels. Therefore, it is possible to perform the smoothing process which does not deteriorate the image. is there.

Next, the fourth enlargement / smoothing process will be described with reference to FIG.
Will be described with reference to. In step S41, it is determined whether the black pixel has a one-to-one four-direction connection pattern in the specified direction. If this determination is affirmative, the process proceeds to step S13. On the other hand, if the result is negative, the process proceeds to step S42.

In step S42, it is judged whether or not there is a connection pattern of black pixels in the eight directions of 1 to 2 to 1 to n in the specified direction of the specified position. If the judgment is negative, the process proceeds to step S43. On the other hand, when this judgment is affirmative, the routine proceeds to step S44, where it is judged whether or not it is the orthogonal angle pattern. When this determination is affirmative, the process proceeds to step S45 to perform a process of not interpolating. When the pattern is not the orthogonal angle pattern, the process proceeds to step S13. In step S13, the same interpolation process as described above is performed.

According to the present embodiment, for example, as shown in FIG. 18, when the black pixels in the periphery of the pixel of interest 61a have an orthogonal angle pattern, steps S13 through S13 of the pixel of interest 61a are performed. Only the one-to-one interpolation processing in S15 is performed. That is, the interpolation process is weakened.

According to this embodiment, since the interpolation processing can be weakened, it is possible to perform the smoothing processing in which the right angle portion of a figure such as a character is kept in balance with the surroundings.
It has been revealed by the study of the present inventor that if the right angled portion is stored at a right angle, the right angled portion is overexpressed in a sharper shape than in the surrounding area and gives a feeling of strangeness.

Each of the above-described embodiments has 2 × in the main / sub scanning direction.
Although the description has been given of the example in which the enlargement is performed four times, the present invention is not limited to this, and it is needless to say that the present invention can be applied to the case where enlargement is performed 1 × 1 to 6 × 6.

[0074]

According to the present invention, since the density data and the color data are separately enlarged and interpolated for binary plus m color image data, it is possible to obtain high-quality enlarged image data. There is an effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of density data and color data.

FIG. 3 is a block diagram showing a flow of operations of this embodiment.

FIG. 4 is a block diagram showing a schematic configuration of an enlargement / smoothing processing apparatus used in the present invention.

5 is a block diagram of a portion that performs processing in the sub-scanning direction in the control circuit of FIG.

FIG. 6 is a block diagram of a portion that performs processing in a main scanning direction in the control circuit of FIG.

FIG. 7 is an explanatory diagram illustrating the technical meaning of main and sub-scanning direction enlarged blocks in-block positions.

FIG. 8 is an explanatory diagram of the operation of FIG.

9 is a timing chart of signals of main parts of FIG.

FIG. 10 is a block diagram showing a schematic configuration of an image data enlargement / smoothing processing device.

FIG. 11 is a diagram showing an example of first interpolation.

FIG. 12 is a flowchart showing a first interpolation operation.

FIG. 13 is a flowchart showing a second interpolation operation.

FIG. 14 is a diagram showing an example of deletion in the second interpolation.

FIG. 15 is a flowchart showing a third interpolation operation.

FIG. 16 is a diagram showing an example of a pattern that deteriorates an image in the third interpolation.

FIG. 17 is a flowchart showing a fourth interpolation operation.

FIG. 18 is a diagram showing an example of an orthogonal angle pattern in the fourth interpolation.

[Explanation of symbols]

4 ... Decompressor, 6 ... Storage memory, 8 ... Image information correction circuit, 9
a ... Density memory, 9b ... Color pixel memory, 11 ... Multiplexer, 12 ... 7 line buffer, 13, 61 ... Register matrix, 14 ... Enlargement processing block, 15 ... Main scanning direction enlargement ratio register, 16 ... Main scanning direction enlargement ratio Registers, 17 ... Control circuit, 62 ... Pattern detection unit, 63 ... Enlargement / smoothing processing unit.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/02 L 9471-5G H04N 1/393 4226-5C 1/60 1/46 8420-5L G06F 15/66 355 C 4226-5C H04N 1/40 D 4226-5C 1/46 Z (72) Inventor Kenichi Sonobe 3-7-1, Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. (72) Inventor Nakamura Toshifumi, 3-7-1, Fuchu, Iwatsuki-shi, Saitama, Fuji Xerox Co., Ltd. (72) Inventor, Tatsuhisa Suzuki 3-7-1, Fuchu, Iwatsuki, Saitama Prefecture, Fuji Xerox Co., Ltd.

Claims (2)

[Claims] 1. Means for storing image data consisting of basic two colors represented by binary values and m other colors (m is an integer of 1 or more) for each density data and color data, and the density data and An image processing apparatus comprising: means for performing expansion interpolation processing on each color data. 2. The image processing apparatus according to claim 1, wherein the means for performing the enlargement interpolation processing is a line buffer for accumulating (2n + 1) (where n is a positive integer) lines of the density data and color data, Of the data accumulated in the line buffer, (2n +
1) A register matrix that stores (2n + 1) pieces of data, and an enlargement interpolation processing unit that performs enlargement interpolation processing of k × l (where k is an enlargement ratio in the main scanning direction and l is an enlargement ratio in the sub-scanning direction). An image processing apparatus comprising: