JPH1198525A - Multi-function device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the multi-function device at a low cost in which a memory used for processing a video signal is effectively utilized and image quality after conversion of the video signal to image data is improved. SOLUTION: The multi-function device is provided with a video signal input terminal 60 that receives a video signal, a CPU 6 and a control circuit 14 that convert the video signal received from the video signal input terminal 60 into image data, a RAM 8 that stores the image data converted by the CPU 6 and the control circuit 14, and a memory management section 54 that detects the usable capacity of the RAM 8. The CPU 6 and the control circuit 14 change the conversion method of the video signal to the image data, based on the detection result by the memory management section 54. Thus, the memory is effectively utilized, the image quality of the converted data is improved and the device is configured at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a multi-function device,
In particular, the present invention relates to a multi-function device having a function of processing a video signal.

[0002]

2. Description of the Related Art Heretofore, a multi-function device (multi-function device) having a printing function by a laser printer or a color inkjet printer, a scanner function using a CCD, a copying function, a facsimile function, and a connection function to a personal computer has been known. ing.

The above-mentioned multi-function device has a built-in memory, and various data are stored in the memory corresponding to various functions. For example, FAX reception data memory, FAX transmission data memory, answering machine recording memory, answering machine response message memory, printer buffer memory, scanner buffer memory, and image data storage memory are used. Have been.

The inventor has considered adding a function of inputting a video signal, performing video capture processing, and outputting image data to a personal computer to the above-described multi-function device. In this case, the video signal is NTSC
Many methods are used. In the NTSC system, one field is used as a basic unit, and two fields constitute one frame. In other words, since the NTSC system is interlaced, it has a half screen. NT
In order to extract color information and luminance information by SC method, FI
An R (Finite Impulse Response) filter can be used.

[0005]

However, when a color signal is extracted by the FIR filter in one field described above, the capacity of the memory to be used may be the minimum capacity (for one half screen), but the quality of the color signal is low. There is a disadvantage that it is bad. That is, since one field is a half screen, the resolution is low and the processing by the FIR filter is limited.
When a signal of one field is extracted by the IR filter, there is a disadvantage that the resolution and the quality are not good because the color information adjacent thereto is extracted and compared.

Next, one frame, that is, one field in two fields
When a screen is configured, when a color signal is extracted by an FIR filter, a larger capacity of memory is required for one field, but the memory capacity is relatively small (for one screen) and the image quality is high. Moderate.
That is, although the resolution is good, the processing by the FIR filter has limitations in terms of resolution and quality as in the case of the above-described one field.

Further, in the case of a still image of the NTSC system, if one frame is composed of two frames, that is, four fields, a color signal is extracted based on a difference between the two frames. In the NTSC system, since the phase is shifted by 180 degrees between the screens, a large color signal can be obtained by taking the difference. Therefore, although the image quality is good due to the effect of the frame difference, there is a problem that the memory capacity needs to be increased.

As described above, when a large amount of memory is required for each function of the multi-function device, it is inefficient to use a large amount of memory for converting the video signal into image data. In addition, if a dedicated memory is provided for image data, a high-speed and large-capacity memory for processing video signals is required. However, there is a problem that the cost of the entire apparatus rises.

The inventor of the present invention has considered the present invention in view of the fact that a multi-function device uses a memory corresponding to various functions and rarely operates all of the various functions simultaneously. It was done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a method for converting image data into image data according to a memory capacity usable in video signal processing is changed. It is an object of the present invention to provide a multi-function device capable of improving image quality and inexpensively configuring the device.

[0011]

According to a first aspect of the present invention, there is provided a multi-function device, comprising: a receiving means for receiving a video signal; and a video signal received by the receiving means. Conversion means for converting the image data, storage means used for storage of image data converted by the conversion means and other processing, detection means for detecting a usable capacity of the storage means, and detection results of the detection means Conversion method changing means for changing the conversion method by the conversion means based on the

In the multi-function device having the above-described configuration, the video signal is received by the receiving means, the converting means converts the video signal received by the receiving means into image data, and the storage means outputs the image converted by the converting means. Stores data. The storage means is also used for other processes. The detecting means detects the usable capacity of the storage means, and the conversion method changing means changes the conversion method by the converting means based on the detection result of the detecting means.

Further, in the multifunction device according to the second aspect of the present invention, in addition to the configuration according to the first aspect, the conversion method changing unit may include a detection result of a usable capacity of the storage unit by the detection unit. And changing the conversion method by the conversion means to a two-screen difference method of extracting color information and luminance information by a difference between two screens, or a FIR filter method of extracting color information and luminance information by an FIR filter. The configuration is characterized by the following.

In the multifunction device having the above-mentioned configuration, when the detecting means detects the usable capacity of the storage means, the conversion method changing means changes the conversion method by the converting means to two screens based on the detection result. To the two-screen difference method for extracting color information and luminance information based on the difference between the two, or the FIR filter method for extracting color information and luminance information using an FIR filter.

In the multifunction device according to the third aspect of the present invention, in addition to the configuration of the second aspect, the conversion method changing unit detects the usable capacity of the storage unit by the detecting unit. When the result is equal to or more than the first predetermined amount, the conversion method is changed to a conversion method using the two-screen difference method.

In the multifunction device having the above configuration, when the detection result of the usable capacity of the storage means by the detection means is equal to or more than a first predetermined amount, the conversion method changing means changes the conversion method. Change to a conversion method using the two-screen difference method.

Further, in the multi-function device according to the fourth aspect of the present invention, in addition to the configuration according to the second or third aspect, the conversion method changing means may include a usable capacity of the storage means by the detecting means. When the detection result is smaller than the first predetermined amount and equal to or larger than the second predetermined amount, the conversion method is changed to a conversion method using a two-field FIR filter method.

In the multi-function device having the above configuration, when the detection result of the usable capacity of the storage means by the detection means is less than a first predetermined amount and equal to or more than a second predetermined amount, the conversion method The changing means sets the conversion method to two-field FIR.
Change to a conversion method using a filter method.

According to a fifth aspect of the present invention, in addition to the configuration of any of the second to fourth aspects, the conversion method changing means includes a use of the storage means by the detection means. If the detection result of the possible capacity is less than the second predetermined amount and equal to or more than the third predetermined amount, one field F
The configuration is characterized by changing to a conversion method using an IR filter method.

In the multifunction device having the above configuration, when the detection result of the usable capacity of the storage means by the detection means is smaller than a second predetermined amount and equal to or larger than a third predetermined amount, the conversion method The changing means changes the conversion method to one field FIR.
Change to a conversion method using a filter method.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a case where a multi-function facsimile apparatus is used as a multi-function apparatus will be specifically described. FIG. 1 is a block diagram showing a schematic configuration of a multifunction facsimile apparatus as one embodiment of a multifunction apparatus according to the present invention.

Generally, a multi-function facsimile machine 2 as a multi-function device has an operation panel 56 as shown in FIG.
Is provided. And multifunctional facsimile machine 2
A display (not shown), a fine lamp, a superfine lamp,
A toner remaining amount display and the like are provided, and a numeric keypad,
A start key, a stop key, a copy key, and the like are provided. In the middle, set key, clear key,
Various operation keys such as a resolution key and a cursor key and function keys are provided.

Then, the state of the facsimile machine 2, the operation procedure, and the like are displayed on the display. The ten keys are operated to select a function of the facsimile apparatus 2 in addition to inputting the facsimile number of the facsimile apparatus 34 of the transmission destination shown in FIG. The start key is a key for instructing the start of a function, and the stop key is
It is a key for giving an instruction to stop the function. The copy key is a key for instructing the start of reading of a document when the facsimile machine 2 is used as a copying machine. The cursor keys are operated when moving a cursor in the display, selecting a function, or the like.

The function keys are keys for instructing the start of display of various functions executable in the facsimile apparatus 2, and the selection of the functions is performed by operating the ten keys or cursor keys. The set key is a key operated when giving an instruction to determine a function selection or the like.

The resolution key is a key for selecting a resolution in the image reading device 22 of the facsimile machine 2 shown in FIG. The resolution is set to standard by default. In that case, neither the fine lamp nor the super fine lamp is turned on.
One press of the resolution key sets it to fine,
The fine lamp is turned on. By pressing twice, the display is set to super fine, the fine lamp is turned off, and the super fine lamp is turned on. Further, if the button is pressed three times, the halftone is set, both lamps are turned on, and the halftone setting is displayed. The halftone gradation level is set to a predetermined gradation (for example, 16 gradations) by operating a function key, a numeric keypad, a cursor key, or the like.
Tones and 32 tones). The toner remaining amount indicator is off when the remaining amount of toner is full, but blinks when the toner is near empty (approaching the empty state) and remains lit when the toner is empty. Is done.

Further, the facsimile apparatus 2 of the present embodiment
As shown in FIG. 1, a control unit 4 is provided, and the control unit 4 includes a CPU 6 as a processing device, a RAM 8 as a memory (storage means), a ROM 10, an EEPROM 1
2. In addition to the control circuit 14, a transmission / reception control circuit 16, a modem 18, a binarization circuit 20, and the like are provided.

The control circuit 14 includes a read control unit 4
8, a video control unit 50, a recording control unit 52, and a memory management unit 54. The recording control unit 52 is connected to the printer mechanism 42. The printer mechanism 42 may be of any type such as a laser printer type, an ink jet type, and a toner jet type. In addition, a color system is required for printing a color image, and a color inkjet printer is particularly preferable. However, when printing of a monochrome image is sufficient, a monochrome laser printer type, ink jet type, or toner jet type may be used.

The control circuit 14 includes a DMA (not shown).
C (direcy memory access controller), latch mechanism,
A parallel / serial conversion circuit and the like are provided. DM
AC is provided between the RAM 8 and the control circuit 14,
This is for performing direct transfer (direcy memory access) of data between the recording control unit 52 and the recording control unit 52 without passing through the CPU 6. When a laser beam is detected by a beam detector BD (not shown), the DMAC issues a transmission request signal of the transfer data to the CPU 6. As a result, the head address of the data to be transferred and the number of transfer data bytes are set in the DMAC by the CPU. The designated data is transferred from the RAM 8 to the control circuit 14 byte by byte. The data is held by a latch mechanism, converted into serial data by a parallel / serial conversion circuit, and transferred to the recording control unit 52 side.

An image reading device 22 and a speaker 24 are connected to the control circuit 14, and a network control unit (hereinafter abbreviated as NCU) 2 is connected to the control circuit 14.
The external line 28 is connected via the line 6. In the case of the present embodiment, the exchange and the external lines 30 and 3 are connected to the external line 28.
The other party's facsimile machine (hereinafter, abbreviated to the other party's apparatus) 34 and the other party's telephone 36 are connected via the connection 2. The external lines 28, 30, and 32 include a general subscriber telephone line, an ISDN line, and a dedicated line.

The binarizing circuit 20 is a circuit for converting the read image data read by the image reading device 22 such as the CCD sensor 46 into binary data.

In the image reading device 22, when the original is read by irradiating the original with light from the light source using the CCD sensor 46, the illuminance unevenness of the light source with respect to the original (for example, the central portion of the original is (E.g., bright and the periphery is dark). Therefore, the output voltage value of the CCD sensor 46 may not accurately correspond to the density of each pixel on the document. To address this inconvenience,
In the facsimile apparatus 2, the threshold value is determined according to the illuminance unevenness and the like, and is stored in a table in the threshold value data memory of the EEPROM 12. The transfer of the threshold data from the EEPROM 12 to the control circuit 14 is also controlled by the DMAC.

That is, the analog output voltage value supplied from the image reading device 22 such as the CCD sensor 46 is EE.
It is determined whether the data is larger than threshold data stored in the PROM 12 (converted from a digital value to an analog signal in the binarization circuit 20). By performing (1), dot data is created. When halftone is selected by operating the resolution key on the operation panel 56, the data is converted into dot data based on the dither matrix.

The transmission / reception control circuit 16 is a multi-function device 2
This is a circuit for exchanging communication-related information such as facsimile numbers and transmission parameters such as resolution between the two devices when the device is connected to the other device.

The modem 18 modulates a digital signal into an analog signal, and outputs the modulated signal to an external line 28,
30 and 32, and NC from external line 28
This is for demodulating an analog signal input via U26 into a digital signal. Therefore, a modulation / demodulation mechanism is provided. Further, in addition to the modulation / demodulation mechanism, a voice synthesis mechanism for synthesizing voice, a modem reception data buffer, a modem transmission data buffer, and the like are provided.

When 8-bit data is stored in the modem reception data buffer in the modem 18, the data is read by an interrupt in the control unit 4 and stored in the FAX-side reception data buffer in the RAM 8. This fax
The side reception data buffer changes depending on the available capacity of the RAM 8. When receiving data, the NCU 26 automatically receives a call from the partner device 34,
At the time of data transmission, a call is automatically sent to the other party.

The RAM 8 as a memory (storage device) includes a FAX-side reception data buffer, a FAX-side transmission data buffer, a read image data buffer, a VTR data buffer for storing A / D-converted NTSC signals, and recording of an answering machine. Memory, answering machine memory for answering machine, encoding buffer, decoding buffer, recording unit input data buffer, recording unit output data buffer, communication related information memory, one line dot data buffer, destination dial memory, report recording request Flag, transmitting flag, transmitting temporary buffer, recording flag, leading edge flag, decoding management table, recording instruction flag, one-page recording end flag, recording end detection flag, paper clogging state detection flag, recording paper out state detection flag, Waiting for recording flag, flag required to recur,
Cartridgeless state detection flag, decrypted page counter,
A recording page counter, a recording line number counter, a decoding management page pointer, a recording management page pointer, a PC side input data buffer, a PC data recording request flag recording temporary buffer,
A recording buffer, a FAX input data buffer, a FAX output data buffer, a FAX data recording request flag, an image reading data recording request flag, a recording / transmission flag, a transmission only flag, and the like are provided.

The RAM 8 is provided with a recording end data memory, a paper or status data memory, a status data memory without recording paper, and a status data memory without cartridge. Further, the program memory in the ROM 10 includes a message output program, an automatic report request generation program, a report recording control program, a reception interrupt program, a decoding program, an interrupt A, B, C program, a recording one-line interrupt program, and a code. Program, data interrupt transmission program, pattern memory storing patterns for converting character data into dot data, parallel data recording program, one-page recording start processing program, one-page recording end processing program, decoding FAX section Output program, toner remaining recording control program, toner remaining interruption detection program, F
An AX device state corresponding output control program and the like are stored.

The EEPROM 12 includes, in addition to the above-mentioned threshold data memory, a registered dial memory for storing a telephone number of a destination to which the status information of the facsimile apparatus 2 is transmitted,
A cartridge absence flag, an empty flag, a near empty flag, and the like are provided.

The recording control unit 52 is connected to a toner remaining amount detecting device (not shown), a recording paper sensor, a BD sensor, an upstream sensor (leading edge sensor), a downstream sensor (paper ejection sensor), and the like. , A drum motor is connected via a drive circuit. The photosensitive drum and the rotating shaft are rotated synchronously by the drum motor.

The control circuit 14 is connected to a personal computer (PC) 40 via a PC interface 38.
Is connected to In the PC 40, image data is input using a keyboard or the like, and stored in the image data memory of the RAM. Recording is instructed by key operation of a keyboard in accordance with the display on the display. This PC
Reference numeral 40 denotes an image data memory which stores character data and dot data as image data, and outputs the character data and dot data to the facsimile apparatus 2.

In the facsimile apparatus 2 configured as described above, the image data output from the PC 40 is recorded and transmitted to the partner apparatus 34, the received image data transmitted from the partner apparatus 34 and received by the facsimile apparatus 2, CC
Image reading device 22 including image data by D sensor 46
The recording of the read image data, the image data obtained by converting the video signal input from the VTR 44 to the video signal input terminal 60, the image data corresponding to the processing communication-related information, and the like are performed.

In the facsimile apparatus 2 of the present embodiment, of the above-mentioned components, C
The image data captured from the CD sensor 46 is stored in the RAM 8
In the following, an example will be described in which a process of converting the NTSC signal input from the VTR 44 to the video signal input terminal 60 into color information, luminance information, and extracted image data is performed.

This embodiment will be described with reference to FIGS. FIG. 2 shows N input to video signal input terminal 60.
9 is a flowchart illustrating an example of processing for converting color information, luminance information, and extracted image data from a TSC signal into image data.

As shown in the block diagram of FIG. 1, the CCD sensor 46 is controlled by a reading control section 48 of the control circuit 14. Data captured by the CCD sensor 46 is stored in the RAM 8 via the memory management unit 54. When the data in the RAM 8 is output to the printer 42, the data is output to the printer 42 via the recording control unit 52. On the other hand, when a facsimile is output, the data stored in the RAM 8 is compressed by the transmission / reception control circuit 16 to the facsimile code and output to the partner device 34 via the modem 18 and the NCU 26.

Here, when the data captured by the CCD sensor 46 is stored in the RAM 8, color data and luminance information are extracted from the NTSC signal input to the video signal input terminal 60. Will be described.

The video signal input terminal 60 is connected to the video control unit 50. The video signal of the NTSC system input from the external VTR 44 to the video signal input terminal 60 is subjected to A / D conversion (analog conversion) by the memory management unit 54. / Digital conversion) and taken into the VTR data buffer of the RAM 8. The A / D-converted video signal captured in the VTR data buffer of the RAM 8 is processed by changing the method of converting the video signal into image data according to the available memory capacity for video capture (retrieving color information and luminance information). Is done.

Here, the memory capacity usable for video capture (extraction of color information and luminance information) is RAM
8 means the remaining capacity excluding the capacity already used in other processing. In the present embodiment, data already captured by the CCD sensor 46 is stored in the RAM 8.
The available memory capacity in the storage area of the RAM 8 is reduced by that much.

In other words, the memory management unit 54 manages the FIR filter processing so as to increase the number of fields in accordance with the available memory capacity for video capture of video signals (extraction of color information and luminance information). . In the present embodiment, the field is 240 × 840 = 2016
Explanation will be made by taking 00 bytes as an example. That is, when the above field is 240 × 840 = 20160 bytes, the memory capacity necessary for video capture is 240 × 840 = 20160 bytes, 1 frame = 1 field × 2 = 403200 bytes, 2 frames = 1 frame × 2 = 806400 bytes.

In the present embodiment, when the memory capacity of the RAM 8 is 1 megabyte, for example, 100
A case in which K bytes are used and the remaining 900 K bytes are used for other various functions and video capture processing will be described. Here, the memory used in the common area is a basic memory area necessary for operating each function of the multi-function device targeted by the present invention.

A predetermined procedure for memory management in the case where the memory required for the field is as described above will be described with reference to the flowchart of FIG. Although not shown, the capture button is provided on the operation panel 56.

First, it is determined whether or not the capture button has been pressed (S1), and if the capture button has been pressed (S1).
1: YES), it is determined whether or not a video input has been made (S2). If the capture button has not been pressed (S1: No), until the capture button is pressed (S
Wait until 1 becomes Yes).

When video input is performed (S2: YE
S), a memory capacity available for video capture is obtained (S3). That is, in this case, the video input NT
R when filtering the capacity of the SC signal
The remaining memory capacity of the AM 8 that is not used is obtained as a memory capacity usable for video capture. Here, when there is no video input (S2: N
o) The processes of step S1 and step S2 are repeated until there is a video input (S2: YES).

When the available memory capacity for video capture is obtained (S3), it is next determined whether the available memory capacity is 806400 bytes or more (S4). If it is 806400 bytes or more (S4:
YES), a process based on the two-frame difference method is set (S5).

If the available memory capacity is less than 806400 bytes (S4: NO), it is determined whether the available memory capacity is 403200 bytes or more (S4).
6). If the available memory is 403200 bytes or more (S4: No, S6: YES), a two-field FIR filter is set (S7).

If the available memory capacity is less than 403200 bytes (S4: No, S6: NO), it is determined whether the available memory capacity is not less than 20160 bytes (S8). When the available memory capacity is more than 20160 bytes (S4: No, S6: No, S8: YE
In S), a one-field FIR filter is set (S9).

After the image processing conditions are set, the color information and the luminance information are fetched as digital data (S11), and thereafter, the process returns to step S1. In addition,
The color information and the luminance information captured in S11 are transmitted to the personal computer (P
C) Output to 40.

If the available memory is less than 20160 bytes (S4: No, S6: No, S8: N
o) Since the minimum memory capacity is insufficient, an error message is displayed (S10), and the process returns to step S1.

As described above, in the case of the NTSC system, the FI
The color information and the luminance information are extracted using the R filter. At this time, since the signal processing is changed according to the memory capacity available for the video capture processing of the video signal, for example, when the memory capacity is small (the present embodiment). 4032 in case of form
In the case of less than 00 bytes and more than 20160 bytes), a color signal is extracted by the FIR filter in the minimum one field.

Further, when the memory has a certain margin more than the case of the one field (in the case of the present embodiment,
(Less than 806,400 bytes and more than 403,200 bytes) can be dealt with by forming one screen with one frame, that is, two fields. Furthermore, when there is ample memory (in the case of the present embodiment, the available memory capacity is 806400 bytes or more), one frame can be composed of two frames, that is, four fields, and the color difference can be obtained by the difference between the two frames. Processing for extracting a signal can be performed, and processing with good image quality (effect of frame difference) can be performed. It should be noted that one frame can be composed of two frames in the case of a still image.

As described above, in the multi-function device, the memory is used corresponding to various functions. However, since it is rare that all of the various functions operate at the same time, the memory of the memory included in the multi-function device is used. Since the signal processing for conversion to image data is changed according to the available memory capacity of the capacity, the color information is extracted in the optimum state according to the available memory capacity, and the luminance information is extracted. Extraction can be performed, and effective use of the memory can be achieved. For this reason, unlike a memory in which a predetermined capacity is set in advance for processing a video signal, the image quality can be improved by effectively using the memory, and the device can be configured at low cost.

When the capture button (switch) is pressed, the presence or absence of image information is detected. When the image information is input, the available memory capacity is detected and the available memory capacity is reduced. Since the video signal of the video signal is captured after determining the corresponding signal processing mode, when the capture button is not pressed, when the image information is not input, the operation relating to the video processing is not activated, and the video is not activated. It is possible to secure a sufficient memory for functions other than signal processing.

In the above-described embodiment, the case where the video capture processing is performed when the image data captured from the CCD sensor 46 remains in the RAM 8 has been described. However, the present invention is not limited to this. The same applies to video capture when memory is used. Further, in the above embodiment, an example in which 1 MB is used as the memory is shown, but the present invention is not limited to this, and a memory of 2 MB or more may be used. Also,
Although the RAM 8 is described as an example of the memory, the present invention is not limited to this, and a predetermined additional RAM or the like may be used. Further, the video signal has been described in the case of the NTSC system, but can be processed in the same manner as in the above embodiment even in the case of the PAL system and the SECOM system.

[0063]

As described above, in the multifunction device according to the first aspect of the present invention, the video signal is received by the receiving means, and the converting means converts the video signal received by the receiving means into image data. The storage means can store the image data converted by the conversion means. The storage means is also used in other processes, but the detection means detects a capacity available for the process of converting a video signal into image data from among the capacities of the storage means, and the detection result of the detection means is used. Based on this, the conversion method changing means can change the conversion method by the conversion means. Therefore, the free space of the storage means,
That is, it is possible to extract color information and luminance information from the video signal by an optimal method according to the capacity available for the process of converting the video signal into image data. Therefore, the memory of the storage unit can be effectively used, and the image quality of the image data can be improved, and the multifunction device can be configured at low cost.

Further, in the multifunction device according to the second aspect of the present invention, when the detecting means detects the usable capacity of the storage means, the conversion method changing means changes the conversion method by the converting means based on the detection result. It can be changed to either a two-screen difference method for extracting color information and luminance information based on a difference between two screens, or an FIR filter method for extracting color information and luminance information using an FIR filter.

In the multi-function device according to the third aspect of the present invention, when the detection result of the usable capacity of the storage means by the detection means is equal to or more than a first predetermined amount, the conversion method changing means is provided. The conversion method can be changed to a conversion method using the two-screen difference method.

Further, in the multi-function device according to the present invention, when the detection result of the usable capacity of the storage means by the detection means is smaller than the first predetermined amount and equal to or larger than the second predetermined amount, The conversion method changing means sets the conversion method to 2 fields F
The conversion method can be changed to a conversion method using an IR filter method.

Further, in the multifunctional apparatus according to the fifth aspect of the present invention, when the detection result of the usable capacity of the storage means by the detection means is less than the second predetermined amount and not less than the third predetermined amount, The conversion method changing means sets the conversion method to one field FI.
The conversion method can be changed to a conversion method using the R filter method.

Therefore, in the multifunction device according to the present invention, it is possible to convert a video signal into image data by an optimum conversion method based on the available capacity of the storage means. Therefore, the memory of the storage unit can be effectively used, and the image quality of the image data can be improved, and the multifunction device can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a multi-function device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing example regarding image conversion of the multi-function device according to the embodiment of the present invention.

[Explanation of symbols]

 2 Multi-function facsimile device 4 control unit 6 CPU 8 RAM 10 ROM 12 EEPROM 14 control circuit 20 binarization circuit 34 partner facsimile device (partner device) 44 VTR 46 CCD sensor 48 read control unit 50 video control unit 52 recording control unit 54 Memory management unit 56 Operation panel 60 Video signal input terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/781 H04N 5/781 510C 9/78

Claims (5)

[Claims] 1. A receiving means for receiving a video signal, a converting means for converting a video signal received by the receiving means into image data, and a storage means for storing the image data converted by the converting means and other processing. Storage means, a detection means for detecting a usable capacity of the storage means, and a conversion method changing means for changing a conversion method by the conversion means based on a detection result of the detection means. Multifunctional device. 2. The conversion method changing unit extracts color information and luminance information based on a detection result of a usable capacity of the storage unit by the detection unit, based on a difference between two screens by a conversion method by the conversion unit. Two-screen difference method, or
2. The multi-function device according to claim 1, wherein the method is changed to one of an FIR filter method for extracting color information and luminance information by an FIR filter. 3. The conversion method using a two-screen difference method when the detection result of the usable capacity of the storage means by the detection means is equal to or more than a first predetermined amount. The multi-function device according to claim 2, wherein the multi-function device is changed to: 4. The conversion method changing means, when the detection result of the usable capacity of the storage means by the detection means is less than a first predetermined amount and not less than a second predetermined amount.
4. The multi-function device according to claim 2, wherein the conversion method is changed to a conversion method using a field FIR filter method. 5. The conversion method changing unit according to claim 1, wherein the detection result of the usable capacity of the storage unit by the detection unit is less than a second predetermined amount and is equal to or more than a third predetermined amount. 5. The multi-function device according to claim 2, wherein the conversion method is changed to a conversion method using a filter method.