JPS62274868A - Still picture transmitter - Google Patents

Abstract

PURPOSE:To easily set up and change the constant of color correction (masking) by previously storing color factors corresponding to plural video input sources or output parts in a storage means. CONSTITUTION:When a switch SW4 is turned to the A side (in case of executing masking), a digital image signal inputted from a memory 67 to a CPU 106 through an interface circuit 101 is masked by a masking operation part 106 based on masking factors previously set up by switches SW5-SW9 and sent to a transmission line 63. Since the masking factors corresponding to plural video input sources are set up, it is unnecessary to change the masking factor at every image transmission to a video input source with different characteristics, so that user's load can be reduced.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a still image transmission device that separates a document image into each color, performs color correction, and then transmits the image. .

[Conventional technology]

An example of a conventionally known device of this type is shown in FIG. In the apparatus shown in this figure, a document such as a photograph is wound around a sending drum l, and this sending drum l is rotated by a motor 28.

Further, the motor drive unit 27 that drives the motor 28 includes:
A signal obtained by dividing the signal from the crystal oscillator 6 by a frequency divider 26 is supplied.

When performing masking processing, switch 5W42
, SW43.5W44, respectively. If you want to send the cyan color signal first, switch 5W40.
to the C side, and while moving the light source 2 and the photoelectric conversion unit 3 every rotation of the transmission drum l, electrical signals Sl, S2 . Obtain S3. That is, in the photoelectric conversion unit 3, light that has passed through the R, G, and B color filters 50 enters each light receiving unit, and electrical signals Sl, S2, . S3
is converted to

” The two consecutive electrical signals S2 and S3 are each sent to an amplifier 3.
2 and amplifier 31, the signals S 2' and S
3'. These signals S 2' and S 3
' are level-adjusted by variable resistors R12 and R13, respectively, and guided to an adder 31. On the other hand, the electric signal S1 is also applied to the adder 31.

Therefore, a C (cyan) signal is sent from the adder 31,
The signal is led to the modulation section 8 via the switch 5W40. As a result, the AM-modulated or FM-modulated signal is amplified by the image amplifying section 10 and output to the transmission path 11. At this time, the signal being output to the transmission line 11 is amplified by the amplifier 12, and an audible sound is emitted from the monitor speaker 13 in order to monitor the transmission state.

In the adder 31 described above, in order to adapt the photoelectrically converted electric signal Sl, 32, 33 to the characteristics of the plate-making ink on the receiving side, the following arithmetic processing is performed as a result.

C=S1+C12・S2'+C1a・33'Here, C
12 connects S 2' to variable resistor R1? The coefficient C13 for adjusting S3' is the coefficient for adjusting S3' from the variable resistor R13.Also, the same process is performed for the magenta version and the yellow version number X, and the data is sent to the transmission line 11. . That is, in the case of the magenta version, in the force 11 calculator 33 of the masking circuit 36, M=C21-Sl'+S2+C23・S3'Here,
C21 is a coefficient for adjusting S l' by variable resistor R214 C23 is a coefficient for adjusting S 3' by variable resistor R23 In the case of yellow version, Y=C31・Sl'+C32eS2'+S3Here, C
31 is a coefficient for adjusting S l' by variable resistor R31 & C32 is a coefficient for adjusting S 2' by variable resistor R32. 1 is an overall configuration diagram of a photo transmission device. In this device, image information sent from a television camera, scanner, etc. is first introduced into the image input section 50, and red, green, blue (
R.G.

B) color separation. These analog signals R, G, B
are digitized by the A/D converter 51 in synchronization with the sampling signal sent out from the sampling pulse generation circuit 52, and stored in the frame memory 67, respectively. The contents of this frame memory 67 are transferred to the D/A converter 5 under the control of the high-speed write/read circuit 53.
6. The converted analog signal is then supplied to the monitor 57.

On the other hand, regarding the image data accumulated in the frame memory 67, the read address setting circuit 54 synchronizes with the timing pulse sent from the transmission synchronization signal generator 55.
The data is read out sequentially from the address specified by . The read digital data is processed by the masking processing circuit 5.
9 performs color correction and is output via a D/A converter 60.

Here, since the above-described masking processing is performed based on a table reference method using each of the R, G, and H input signals as addresses, the masking processing circuit 59 includes a large-capacity table memory.

[Problem that the invention seeks to solve]

However, since the masking processing circuit 36 in the apparatus shown in FIG. 5 includes a large number of variable resistors, it has the disadvantage that adjustment is very difficult and it is not suitable for miniaturization. Also, when moving this device,
It was possible to accidentally touch these variable resistors and have to re-adjust them.

Furthermore, in the apparatus shown in FIG.
The drawback is that a large-capacity conversion ROM is required. For example, if each R, G, and H signal has 256 gradations, and the ROM output is 8 bits, 256
A memory capacity of x256 x 3 bytes is required, which is not suitable for miniaturization. Moreover, the mask data is stored in normal ROM (
Read ONLY Memory) or EEPROM (Electrical
ly Erasable and Programa
ble Re a donly Memory)
Changing the masking constants that are written to the computer requires a great deal of effort, and it is almost impossible for ordinary users to change the masking constants.

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned points, an object of the present invention is to provide a still image transmission device configured to allow a user to easily set and change color correction (masking) constants.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a still image transmission device that is compatible with a plurality of video input sources or output units, and is equipped with means for color-separating a document image and performing color correction processing according to color coefficient values. storage means for storing a plurality of color coefficient values;
It is characterized by comprising a selection means for selecting the plurality of video input sources or output units.

[Effect]

Each correction coefficient for masking processing according to a plurality of video inputs or output sources stored in the storage means can be selectively set manually or automatically according to the means for selecting the input or output source.

〔Example〕

Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a block diagram showing an embodiment of a still image transmission device to which the present invention is applied. In this figure, the same components as those shown in FIG. It is numbered. Therefore, the parts unique to this embodiment include the input selector circuit 75, the interface circuit 101, and the central processing unit (C
PU) 100 and switch control unit 78.

60 is for transmission, 61 is a modulator, 62 is an amplifier,
64 is a speaker amplifier, 65 is a speaker, 75 is an NT
SC camera 70, RGB 3-tube camera 71. This is an input selector that switches the output from the i-key recording and reproducing device 72 according to the output of the processing device 106 and transmits the same to the memory 51.

73 is a detection circuit that detects the presence or absence of an input switched by the input selector.

A circuit 76 generates a trigger signal for reading a video signal into the memory 67.

Reference numeral 78 denotes an input select switch SW20 that selects the input of the input selector circuit 75, and SW5 to SW described later.
A switch control unit 80 is connected with a switch 9, an NTSC camera 70, an RGB camera 71 . This is a color correction data storage section that stores masking coefficients corresponding to each input source of the magnetic recording/reproducing device 72. 5W30 is D to monitor 57
This is a changeover switch that displays either the output of the /A converter 56 or the color correction coefficient.

The input source selected by SW20 is selected by the control unit 103 and the input selector 75, and the video signal A/D converted by the A/D converter 51 is stored in the memory 67 according to the timing of turning on the trigger switch SWl. be included.

Note that if no video signal is input from the input source selected by the input selector circuit, the trigger switch S
Even if W21 is turned on, the data will not be written to the memory 67.

The digital image signal in the memory 67 that is taken into the CPU 106 via the interface circuit 101 is sent out from the transmission synchronization signal generator 55 when the switch SW4 is turned to the B side (that is, when no color correction is performed). The D/A converter 60
A is converted into an analog signal by a modulator 61
The signal is M-modulated or FM-modulated and sent to a transmission line 63 via an amplifier 62. This transmission signal is sent to the monitor amplifier 64.
The sound can be heard as audible sound through the speaker 65.

In addition, when the switch SW4 is tilted to the A side (that is, when performing color correction), the switches SW5 and SW
6, the color correction coefficients set by SW7, SW8, and SW9 (described in detail later with respect to FIGS. 2 to 4)
Based on this, color correction is applied in the color correction calculation unit 104, and the signal is similarly sent to the transmission path 63.

FIG. 2 is a block diagram showing the configuration of this color correction calculation section 106. In the figure, reference numeral 201 denotes a white balance adjustment section, which functions to adjust the pedestal levels of R, G, and B signals introduced via the control section 103 (see FIG. 1) and to expand the dynamic range.

202 is a brightness density conversion unit, into which the output signal of the white balance adjustment unit 201 is introduced.

C, , Ml and Yl signals (density signals at the stage before performing color correction) are formed.

A masking calculation unit 203 performs a correction calculation based on the data stored in the color correction data storage unit 80.

204 is a minimum value detection unit, "1 C1°M 1 ,
Y The lowest level L of the 1 signals is detected and output. This lowest level L is necessary to create a black color on the receiving side and is used to form a K (black) signal.

205 is an under color removal unit, which includes three subtracters 205A to 2.
Contains 05C. 206 is a density/luminance converter, 207
is a comparator.

208 to 211 are UCY (undercolor removal for yellow eyes) coefficient, UCM (undercolor removal for magenta plate) coefficient, U
This is a circuit that multiplies the CC (undercolor removal for cyan plate) coefficient and the UCB (undercolor removal for black eye) coefficient by the ``-'' signal (actually, these coefficient values are specified by the control unit 103 in the CPU 106). (The procedure for setting each coefficient will be explained with reference to FIG. 4).

The undercolor removal process is performed as follows.

A comparator 207 compares the level of the L signal obtained from the minimum value detection section 204 and a preset BRP (breakpoint) value, and if L>B RP, the switch 5WLO is closed. Further, if L<BRP, the switch 5W10 is opened. Regarding switch 5WII, when performing 3-color transmission (cyan, magenta, yellow), move it to the B side and keep switch SWIO open, and perform 4-color transmission (cyan, magenta, yellow).
When performing the yellow version, black clothes), turn it to the A side.

When the above-mentioned switch swto is closed, C2. M2. LXUCC, LXUCM, and LXU from the level of Y2 signal respectively.
The value CY is subtracted, and a density signal representing the result is sent to the density/luminance converter 206. Further, a density signal representing LXUCB is also sent to the density/luminance converter 20B, and C, M,
The Y and BK multiplied signals are sent to the D/A converter 60.

FIG. 3 shows an example in which the various color correction coefficients described above are displayed on the monitor 57 (see FIG. 1). FIG. 4 is a flowchart showing the procedure for setting the color correction coefficients shown in FIG.

First, it is determined whether or not the data set switch SW5 is on (SO), and if it is off, 5W30 is set to D/
The video signal is displayed on the monitor when it is turned over to the A converter side, and the SW
When SW 30 is turned on, the SW 30 is turned to the color correction coefficient side, and the color correction coefficient is displayed on the monitor screen (step 31° S2). Next, press the cursor up switch SW6 or the cursor down switch SW7 to move the cursor to the desired position (Step S3 Pass S8→SI
O, step S4→S9→5IO). In this case, according to the contents of the cursor counter that is updated by moving the cursor, the display on the monitor is as shown in Fig. 3. 27PAGE2 (NT
Color correction coefficient compatible with SC camera), 28-41PAG
E3 (color correction coefficient corresponding to RGB camera) is changed and displayed (S15 to 316). Each of these PAGEs is stored in the color correction data storage section 80.

After moving the cursor to the desired position, press the coefficient increase switch SW8 or the coefficient decrease switch SW9 to change the coefficient value to the desired value (steps S5→S12).
．． Step S6→S13).

Next, in order to instruct the CPU 106 to change the setting of the color correction coefficient, the data set switch SW5 is turned off (step SO→5l1).

The coefficient setting data transmitted to the CPU 106 is stored in a battery-backed color correction data storage memory (or EEPROM, both not shown), and is not lost even when the power is cut off. Also, 5WIO is also D/
Since it is tilted to the A converter 56 side, the memory 67 is installed on the monitor.
The video signal from is played back.

Which coefficient to use among the color correction coefficients set as described above is determined by the fact that a trigger pulse that causes the switch 21 to capture the video signal into the frame memory is supplied from the video capture trigger generation unit 67 to the reframe memory. When detected (S l 8), an operation is performed using the color modification coefficient corresponding to the selected input source (S
19). The color-corrected signal is transferred to the D/A as described above.
The signal is converted into an analog signal by a converter 60, modulated by an AM or FM modulator 61, amplified by an amplifier 62 to a signal level suitable for the transmission path, and sent to a transmission path 63 after cutting off the direct current. In addition, the video detection circuit 73 determines the presence or absence of the video signal as the trigger pulse for capturing the input video signal into the frame memory by the SW21, and if there is no signal, the 5W22 becomes an oven and prevents the trigger pulse from being sent to the frame memory. That is, rewriting of the information in the frame memory is prohibited, and at this time, the selection of color correction variables is also maintained in the previous state.

As explained above, according to this embodiment, by making it possible to set color correction coefficients corresponding to multiple video input sources,
It is no longer necessary to change the color correction coefficients each time an image is transmitted for video input sources with different characteristics, which has a great effect on immediacy and reduces the burden on the user. Furthermore, when an image is captured into the image memory, the color correction coefficient corresponding to the captured image is automatically switched, thereby eliminating the need for a switch for selecting a color correction coefficient.

In this embodiment, the video input source is an NTSC camera, an RG
B camera and magnetic recording/reproducing device are shown as three input sources, but even if there are three or more input sources, the same method can be used if the color correction coefficient corresponding to the input source is prepared in advance in the coefficient setting mode. It is possible.

Furthermore, if there are not only video input sources but also multiple video output units, such as printers, and different color corrections are required for the printers, color correction coefficients corresponding to the output units may be stored in advance in the storage means. The present invention can be applied.

〔Effect of the invention〕

As explained above, according to the present invention, the color coefficients corresponding to a plurality of video input sources or output sections are stored in advance in the storage means, so that each time the video input source is switched to a different input source, the color coefficients are changed. This has the effect of eliminating the need to reconfigure the settings.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a still image transmission device to which the present invention is applied, and FIG. 2 is a block diagram showing a detailed configuration of the color correction calculation section shown in FIG. 1. FIG. 3 is a diagram showing an example of monitor display in this embodiment, and FIG. 4 is a flowchart showing a procedure for setting color correction coefficients. FIGS. 5 and 6 are block diagrams each showing an example of a conventionally known color photo transmission device. 50...... Image input section, 51...... A/D converter. 52... Sampling pulse generator, 5
3......High-speed write/read address setting circuit, 54...Read address setting circuit, 5
5...Transmission synchronization signal generator, 56...
...D/A converter, 57...Monitor, 78...Switch control section, 101...
...Interface circuit, 106...
...CPU, 201...White balance adjustment section, 2
02...Brightness density conversion section, 203...
...Masking calculation section.

Claims (1)

[Claims] 1) In a still image transmission device equipped with means for color-separating a document image and performing color correction processing according to color coefficient values, a plurality of colors corresponding to a plurality of video input sources or output units are provided. 1. A still image transmission device comprising: storage means for storing coefficient values; and selection means for selecting the plurality of video input sources or output units. 2) The storage means outputs the color coefficient value corresponding to the selected video input source or output unit from among the stored color coefficient values according to the selection by the selection means. The still image transmission device according to item 1.