JP2001266111A - Picture processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture processor which can change the processing order of plural picture processings such as color space conversion, enlargement/ reduction and binarization. SOLUTION: An input/output selection means 5 for selecting either a picture memory or the other picture processing as the input/output destination of data in one picture processing is included. The processing order of the picture processings can be changed by setting the input/output selection means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an input / output data control technique for each image processing in an image processing apparatus for performing a plurality of image processings such as color space conversion, enlargement / reduction, and binarization.

[0002]

2. Description of the Related Art Photo data from digital cameras,
When so-called bitmap data such as data read by a scanner is input and printed by a printer, image processing such as color space conversion, enlargement / reduction, and binarization is required.

As the resolution and printing resolution of input data increase, the amount of data to be processed increases.
There is an increasing demand for faster processing.

In a conventional image processing apparatus, the order of processing is fixed, for example, such that enlargement / reduction processing is performed, then color space conversion processing is performed, and finally binarization processing is performed.

[0005]

However, when the enlargement ratio is small relative to the input data (ie, reduction), the order of the image processing is first the enlargement / reduction, then the color space conversion, and finally the binarization order. However, when the enlargement ratio is large, the color space conversion process is performed first, and then the enlargement / reduction process is performed.
Finally, performing the binarization processing is a desirable configuration because the memory capacity required for image processing on the image memory is reduced and the processing time is shortened.

However, as described above, conventionally, the processing order is fixed, so that the memory capacity required on the image memory is increased, and the image processing takes time.

An object of the present invention is to provide an image processing apparatus capable of changing the order of image processing.

[0008]

In order to solve this problem, the present invention obtains image data from an image memory, performs a plurality of image processes such as color space conversion, enlargement / reduction, and binarization, and performs image processing again. An image processing apparatus for storing data in a memory, comprising: a memory control unit for controlling an image memory;
Input / output selecting means for selecting either an image memory or another image processing as a data input / output destination in one image processing.

Thus, an image processing apparatus capable of changing the order of image processing can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application obtains image data from an image memory, performs color space conversion, enlarges /
An image processing apparatus for performing a plurality of image processes such as reduction and binarization and storing data in an image memory again, comprising a memory control unit for controlling the image memory, and a data input / output destination in one image process And an input / output selecting means for selecting either an image memory or another image processing, so that the processing order of the image processing can be changed according to the content of the image processing.

According to the invention of claim 2 of the present application, image data is obtained from an image memory to perform color space conversion, enlargement / reduction,
An image processing apparatus for performing a plurality of image processes such as value conversion and storing data in an image memory again, comprising: a memory control unit for controlling an image memory; and an image memory as a data input / output destination in one image process. And input / output selecting means for selecting either one of the image processing and the other image processing, thereby setting the input / output selecting means for each image processing based on the enlargement / reduction magnification setting. And an input / output setting means. The order of image processing can be automatically changed by setting an enlargement ratio.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(Embodiment) FIG. 1 is a block diagram showing a configuration of an image processing apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an image processing apparatus according to the present embodiment. In the present embodiment, the image processing includes a color space conversion process for converting an RGB color space to a CMYK color space, an enlargement / reduction process for enlarging / reducing one line of an image, and a threshold table for pixels. A binarization process for comparing and binarizing will be described as an example.

For these image processing, input / output selecting means 3, 4, and 5 are provided, respectively. Further, memory control means 2 for controlling input / output of the image memory, input / output selecting means 3, 4, and 5 are provided. The input / output automatic setting means 6 which can automate the setting of the image processing, and a microprocessor MPU which performs setting control of various image processing.

FIG. 2 is a block diagram of the memory control means according to the embodiment of the present invention.

In FIG. 2, a memory control means 2 receives a color space conversion input request signal C as an input of an image memory read request.
color_ireq, enlargement / reduction input request signal Scal
e_ireq, binarized input request signal Dither_ir
eq, receives a color space conversion output request signal Color_oreq, an enlargement / reduction output request signal Scale_oreq, and a binarization output request signal Dither_oreq as an input of an image memory write request, and receives a binary output request, enlargement / reduction output by memory control. Requests, color space conversion output requests, binarization input requests, enlargement / reduction output requests, color space conversion output requests are given priorities in order, and requests are accepted, and the color space conversion input address signal Color_ia
drs, color space conversion output address signal Color_oa
drs, enlargement / reduction input address signal Scale_ia
drs, enlargement / reduction output address signal Scale_oa
drs, binarized input address signal Dither_iad
rs Binary output address signal Dither_oadr
The address of the request received from the address s is output as the image memory address signal mem_ad, and the memory control is performed.

In the memory control, a memory chip select signal mem_cs and a memory write enable signal mem_we are output to the image memory, and reading and writing of the image memory are performed.

To read the image data, the input data signal memdt_in from the image memory is stored in the input buffer, and when the storage in the input buffer is completed, the input buffer valid signal mem_iready is validated, and the color space conversion input reception signal Color_iack, the enlargement / A reduced input accepting signal Scale_iack and a binarized input accepting signal Dither_iack are transmitted to the image processing that has accepted the input request.

The input image data signal memdt is sent from the input buffer to each image processing. Each time a color space conversion input reception signal Color_ready, an enlarged / reduced input reception signal Scale_ready, and a binary input reception signal Dither_ready are received. Send the contents of the input buffer as memdt,
When the transmission of the data of all the input buffers is completed, the input buffer valid signal mem_iready is invalidated, and the cycle of the input request is terminated.

Image data is written in Color_ore
When any of q, Scale_oreq, and Dither_oreq is received by the memory control, the output buffer valid signal mem_oready is made valid, and the color space conversion output receiving signal Color_oa is received in response to the output request.
ck, enlargement / reduction output acceptance signal Scale_oac
k, and sends out a binarized output acceptance signal Dither_oack for the image processing that has accepted the input request. When the output buffer receives the color space conversion output transmission signal Color_ready, the enlargement / reduction output transmission signal Color_ready, and the binarized output transmission signal Dither_ready, the color space conversion output data signal Color_data_out, the enlargement / reduction output according to the transmission signal. The data of the data signal Scale_data_out and the binary output data signal Dither_data_out are stored in the output buffer, and when the output buffer finishes receiving all data, the output buffer valid signal mem_o
ready is invalidated and the output buffer data signal me
Writing to the image memory is performed using mdt_out, and when all the data in the output buffer has been written to the image memory, the cycle of the output request ends.

FIG. 3 shows a block diagram of the input / output selecting means 3 for color space conversion processing.

The input / output selecting means 3 sends an input request signal Color_ireq_i from the color space conversion process to the memory control by a Color_ireq signal when the input is selected to the image memory in the input selection setting, and performs the color space conversion by the memory control. After receiving the input reception signal Color_ack, the color space conversion input reception completion signal Color_ready_e from the color space conversion processing is changed to Color.
_Ready signal while transmitting the image data signal me
input data signal C for color space conversion processing by selecting mdt as input
Select as color_data_in and output to color space conversion processing.

In the case where the input is set to the output data of the enlargement / reduction processing in the input selection setting, when the enlargement / reduction output transmission signal Color_ready is valid, the color space conversion input reception valid signal from the color space conversion processing is valid. Co
lor_ready_s to Color_ready
Output / enlarged / reduced output data signal Scal
e_data is selected as an input data signal Color_data_in of the color space conversion process by input selection, and output to the color space conversion process. At this time, Color_ire
The ready signal is received by the input of the color space conversion processing and outputs a ready signal Color_ready_i.

In the input selection setting, if the input / output automatic control valid signal auto_en is valid, the setting is made according to the color space conversion automatic control input selection signal auto_icol whether the input is performed from the image memory or from the output data of the enlargement / reduction processing. If the input / output automatic control enable signal auto_en is invalid, the setting is made as to whether the input is performed from the image memory or from the output data of the enlargement / reduction processing according to the input selection setting set by the MPU.

When the output is selected in the image memory in the output selection setting, the output request signal Col from the color space conversion processing is output.
or_oreq_i to memory control
After receiving the color space conversion output acceptance signal Color_oack from the memory control, when the output buffer valid signal mem_oready is valid, the color space conversion output transmission signal Color_ore from the color space conversion processing is transmitted.
ady_i is transmitted by a Color_ready signal,
Color space conversion output data signal Col from color space conversion processing
or_data_out_i is changed to Color_data_
Transmission is performed by an out signal.

When the output selection setting is set to the input of the enlargement / reduction processing, the enlargement / reduction input reception signal S
When the call_iready is valid, the color space conversion output transmission signal Color_ore from the color space conversion processing
ady_i is transmitted by a Color_ready signal,
Color space conversion output data signal Col from color space conversion processing
or_data_out_i is changed to Color_data_
When the output signal is transmitted and the output selection setting is set to the input of the binarization processing, the binarization input reception signal Dit
When her_ready is valid, color space conversion output transmission signal Color_orea from color space conversion processing
dy_i is transmitted by a Color_ready signal.

In the output selection setting, if the input / output automatic control valid signal auto_en is valid, the output is performed to the image memory in accordance with the color space conversion automatic control output selection signal auto_ocol, or to the input of the enlargement / reduction processing. Whether the input / output automatic control enable signal auto_en is invalid, whether to perform output to the image memory according to the output selection setting set by the MPU, or to input to the enlargement / reduction processing, It is set whether or not to perform the input of the binarization processing.

FIG. 4 shows a block diagram of the input / output selecting means 4 for enlargement / reduction processing.

The input / output selecting means 4 sends an input request signal Scale_ireq_i from the enlargement / reduction processing to the memory control by a Scale_ireq signal when the input is selected to the image memory by the input selection setting, and enlarges / reduces the data by the memory control. After receiving the input accepting signal Scale_iack, the scale-reduction input receiving completion signal Scale_iready_e from the enlargement / reduction processing is changed to Scale.
_Ready signal while transmitting the image data signal me
Input data signal S for enlargement / reduction processing by input selection of mdt
It is selected as call_data_in and output to enlargement / reduction processing.

When the input is set to the output data of the color space conversion processing in the input selection setting, when the color space conversion output transmission signal Color_ready is valid, the enlargement / reduction input reception valid signal from the enlargement / reduction processing is effective. Sc
ale_ready_s to Scale_ready
Color space conversion output data signal Colo
r_data is selected as an input data signal Scale_data_in of the enlargement / reduction processing by input selection, and
Output is performed to the reduction process. At this time, Scale_ire
The ready signal receives the input of the enlargement / reduction processing and outputs a preparation completion signal Scale_ready_i.

In the input selection setting, if the input / output automatic control valid signal auto_en is valid, the setting of whether the input is performed from the image memory or from the output data of the color space conversion processing in accordance with the enlargement / reduction automatic control input selection signal auto_iscl is set. If the input / output automatic control validity signal auto_en is invalid, the setting is made according to the input selection setting set by the MPU whether input is performed from the image memory or from output data of the color space conversion processing.

When the output is selected in the image memory in the output selection setting, an output request signal Scal from the enlargement / reduction processing
e_oreq_i to memory control Scale_oreq
After receiving the enlargement / reduction output accepting signal Scale_oak from the memory control, when the output buffer valid signal mem_oready is valid, the enlargement / reduction output transmission signal Scale_orea from the enlargement / reduction processing is valid.
dy_i is transmitted as a Scale_ready signal, and an enlarged / reduced output data signal Scal from the enlargement / reduction processing is transmitted.
e_data_out_i is changed to Scale_data_o
The transmission is performed by the out signal.

When the output setting selection setting is set to the input of the color space conversion processing, the enlargement / reduction output transmission signal Scale_or from the enlargement / reduction processing is performed when the color space conversion input reception signal Color_ready is valid.
ready_i is transmitted as a Scale_ready signal, and an enlarged / reduced output data signal S from the enlargement / reduction processing is transmitted.
call_data_out_i is changed to Scale_data
When the output is performed by the a_out signal and the output setting selection setting is set to the input of the binarization processing, the enlargement / reduction output transmission signal Scale_ from the enlargement / reduction processing is performed when the binarization input reception signal Dither_ready is valid.
"ready_i" is transmitted by a Scale_ready signal.

In the output selection setting, if the input / output automatic control valid signal auto_en is valid, the output is performed to the image memory in accordance with the enlargement / reduction automatic control output selection signal auto_oscl, or is performed to the input of the color space conversion processing. If the input / output automatic control enable signal auto_en is invalid, the output is performed to the image memory according to the output selection setting set by the MPU, or is performed to the input of the color space conversion processing. It is set whether or not to perform the input of the binarization processing.

FIG. 5 shows a block diagram of the input / output selecting means 5 for the binarization processing.

In the input / output selection means 5, when an input is selected for the image memory in the input selection setting, the input request signal Dither_ireq_i from the binarization processing is transmitted to the memory control by the Dither_ireq signal, and the input data is binarized by the memory control. After receiving the input reception signal Dither_iack, the binarization input reception completion signal Dither_iready_e from the binarization processing is converted to Dither_ir.
The image data signal memdt is transmitted while using the ready signal.
Is input data signal Dither for binarization processing by input selection
_Data_in and output to the binarization process.

When the input is set to the output data of the color space conversion processing in the input selection setting, when the color space conversion output transmission signal Color_ready is valid, the binarization input reception valid signal from the binarization processing is output. Dither
_Ready_s as a Dither_ready signal and a color space conversion output data signal Color_
input data signal Di for binarization processing by inputting data
When the input is set as the output data of the enlargement / reduction processing in the input selection setting, the enlargement / reduction output transmission signal S
When call_oready is valid, a binarized input reception valid signal Dither_ir from the binarization process
While sending the ready_s as a Dither_ready signal, the color space conversion output data signal Scale_dat
input data signal Dithe for binarization processing by selecting a
It is selected as r_data_in and output to the binarization processing.

At this time, the Dither_ready signal is the input of the binarization processing and the preparation completion signal Dithe
Output r_ready_i. In the input selection setting, if the input / output automatic control valid signal auto_en is valid, 2
In accordance with the value automatic control input selection signal auto_idit, the input is performed from the image memory, from the output data of the color space conversion process, or from the output data of the enlargement / reduction process, and the input / output automatic control enable signal auto_en is set.
Is invalid, the setting is made in accordance with the input selection setting set by the MPU whether the input is performed from the image memory, from the output data of the color space conversion process, or from the output data of the enlargement / reduction process.

Output is performed to the image memory, and an output request signal Dither_oreq_i from the binarization processing is sent out to the memory control by a Dither_oreq signal, and an output buffer valid signal mem_oread is received after receiving the binarized output accepting signal Dither_oack from the memory control.
When y is valid, the binarized output transmission signal Di from the binarization processing
ther_oready_i to Dither_orea
dy signal, and outputs the binarized output data signal Dither_data_out_i from the binarization processing to Dithe
Transmission is performed by the r_data_out signal.

FIG. 6 is a block diagram of the input / output automatic setting means 6.

In FIG. 6, a threshold register is a register set by the MPU.
The threshold value comparison unit performs magnitude comparison with the reduction value, and when the enlargement / reduction setting value is equal to or larger than the setting value of the threshold value register,
The color space automatic control input selection signal auto_icol is output to the enlargement / reduction processing output, and the enlargement / reduction automatic control input selection signal a
auto_iscl to the image memory, binarized automatic control input selection signal auto_idit to the color space conversion processing output,
The color space automatic control output selection signal auto_ocol is input to the binarization processing input, and the enlargement / reduction automatic control output selection signal out is output.
o_oscl is set as an output for setting color space conversion processing input.

If the enlargement / reduction set value is smaller than the set value of the threshold register, the color space automatic control input selection signal auto_
icol to the image memory, enlargement / reduction automatic control input selection signal auto_iscl to color space conversion output, binarization automatic control input selection signal auto_idit to enlargement / reduction processing output, color space automatic control output selection signal auto_oc
ol is set to the enlargement / reduction processing input, and the enlargement / reduction automatic control output selection signal auto_oscl is set to the output for setting the binarization processing input.

The input / output automatic control valid register is MP
U, the input / output automatic control enable signal auto
_En is generated.

[0045]

As described above, according to the present invention, color space conversion, enlargement / reduction,
An image processing apparatus for performing a plurality of image processing such as binarization and storing data in an image memory again, comprising: a memory control unit for controlling the image memory; and an image input / output destination in one image processing. The input / output selection means for selecting either the memory or other image processing, thereby enabling the processing order of the image processing to be changed, and allowing the processing order to be changed according to the content of the image processing, thereby allowing the image processing to be performed on the image memory. And the processing speed can be increased.

An image processing apparatus which acquires image data from an image memory, performs a plurality of image processes such as color space conversion, enlargement / reduction, and binarization, and stores data in the image memory again. By having a memory control means for controlling a memory and an input / output selecting means for selecting either an image memory or another image processing as an input / output destination of data in one image processing, It is possible to change the processing order of the image processing only by setting the threshold without setting all the input / output selecting means.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a memory control unit according to the embodiment of the present invention;

FIG. 3 is a block diagram of input / output selecting means for color space conversion processing according to the embodiment of the present invention;

FIG. 4 is a block diagram of input / output selecting means for enlargement / reduction processing according to the embodiment of the present invention;

FIG. 5 is a block diagram of an input / output selection unit for binarization processing according to the embodiment of the present invention;

FIG. 6 is a block diagram of an input / output automatic setting unit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image processing apparatus 2 Memory control means 3, 4, 5 Input / output selection means 6 Input / output automatic setting means

Claims (2)

[Claims] An image processing apparatus for acquiring image data from an image memory, performing a plurality of image processes such as color space conversion, enlargement / reduction, and binarization, and storing the data in the image memory again. An image processing apparatus comprising: memory control means for controlling a memory; and input / output selecting means for selecting either an image memory or another image processing as a data input / output destination in one image processing. . 2. An image processing apparatus which acquires image data from an image memory, performs a plurality of image processes such as color space conversion, enlargement / reduction, and binarization, and stores the data in the image memory again. Memory control means for controlling a memory; input / output selection means for selecting either an image memory or another image processing as a data input / output destination in one image processing; enlargement / reduction magnification setting And an input / output setting means for setting input / output selection means for each image processing based on the image processing apparatus.