JPH099302A - Image controller - Google Patents

Abstract

PURPOSE: To detect a fault in image data such as color fault, shake and distortion by providing a digital fault detection circuit and an analog fault detection circuit to the controller. CONSTITUTION: An image fault detection circuit 21 is composed of a digital fault detection circuit 22 and an analog fault detection circuit 23. The digital fault detection circuit 22 is composed of a comparison data storage circuit 5 storing digital image data designated in advance and a digital comparator circuit 6 comparing an RGB signal in the unit of pixels outputted respectively from the circuit 5 and from a storage circuit 2 storing the received or inputted digital image data. The analog fault detection circuit 23 is composed of a comparison data storage circuit 7 storing analog image data designated in advance for each RGB signal in the unit of a pixel and an analog comparator circuit 8 comparing RGB signals in the unit of the pixels outputted respectively from a D/A converter circuit 3 and the comparison data storage circuit 7. When any numatch is detected the circuit 23 outputs alarm signals 11, 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image control device for outputting digital image data received from a communication line and analog image data input from a video data output device to a display output device for display. The present invention relates to an image control device with an image abnormality detection circuit that detects an abnormality in image data such as image color abnormality, shaking, or distortion.

[0002]

2. Description of the Related Art The quality of a display image in a conventional image communication apparatus is automatically judged from an abnormality of data recorded on a recording medium like a line scanning type image communication apparatus disclosed in JP-A-3-53763. It is used for the purpose of positive detection.

FIG. 2 is a block diagram showing an example of such a conventional image communication apparatus.

In FIG. 2, reference numeral 41 is a photomultiplier tube, 42 is a head amplifier that doubles the output of the photomultiplier tube 41, 43 is an analog control section that adjusts the analog signal from the head amplifier 42, and 44 is an analog control section. An A / D converter that converts an analog signal from 43 into a digital signal, 45 is an input side line memory that temporarily stores the digital signal from the A / D converter 44, and 46 controls this input side line memory 45. An input side line memory control unit, 47 is an output side line memory for temporarily storing the image signal sent from the image signal control circuit, and 48 is a pulse for shaping the image signal pulse output from the output side line memory 47. A shaping circuit, 49 is a modulation driver for driving the optical modulator 53, and 50 is an output side line memory control for controlling the output side line memory. Reference numeral 51 denotes a control unit for synchronizing the input side line memory control unit 46 and the output side line memory control unit 50, and 52 denotes line data from the input side line memory control unit 46 and the output side line memory control unit 50. It is a comparison circuit for comparing.

The image communication apparatus thus configured operates as follows. That is, the analog signal output from the photomultiplier tube 41 is amplified by the head amplifier 42, adjusted by the analog control unit 43, converted into a digital signal by the A / D converter 44, and temporarily stored in the input side line memory 45. It can be stored. On the other hand, the image signal sent from the image signal control circuit is temporarily stored in the output side line memory 47. These input side line memories 45
The line data stored in the output side line memory 47 is synchronized with the line and timing by the control unit 51, extracted by the input side line memory control unit 46 and the output side line memory control unit 50, and the comparison circuit 5
Compared in 2. As a result, when the line data of both are in agreement, it means that the recording is being performed well, and when they are not in agreement, it means that the recording is abnormal, so a warning is issued as a recording error. .

[0006]

The means for judging the quality of image recording of the line scanning type image communication apparatus as described above is as follows.
Since the abnormality of the recording data on the recording medium is detected line by line, it has a drawback that it cannot be used as an abnormality detecting means of a display output device for displaying a two-dimensional image.

Further, since it is not possible to detect the abnormality of the image data such as the color abnormality of the image or the shake or the distortion, the abnormality such as the color shift, the shake or the distortion of the display output device causes the displayed image to be noticed by human eyes. Therefore, it is necessary to judge whether the abnormality is caused by the defect of the input signal, the defect of the display output device, or the defect of the image control device. It also has a problem that it is difficult.

[0008]

An image control apparatus according to the present invention comprises a receiving circuit for receiving digital image data from a communication line and an analog / digital conversion circuit for converting analog image data input from a video data output apparatus into a digital signal. And a storage circuit that stores the digital image data received by the reception circuit or the digital signal input from the analog-digital conversion circuit for each pixel of a red signal, a green signal, and a blue signal for each pixel, and the storage circuit. A digital-analog conversion circuit that converts the red signal, the green signal, and the blue signal stored in the analog signal to an analog signal and outputs the analog signal to the display output device; and digital image data serving as a reference to which the output signal from the storage circuit is input. The first alarm signal when they compare and they do not match A digital abnormality detection circuit for outputting and an analog abnormality detection circuit for inputting an output signal from the digital-analog conversion circuit and comparing with analog image data serving as a reference and outputting a second alarm signal when they do not match. In particular, a first comparison data storage circuit that stores reference digital image data and an output signal from the storage circuit are input to compare with the data of the first comparison data storage circuit. And a digital comparison circuit that outputs a first alarm signal when they do not match, or a second comparison data storage circuit that stores analog image data that serves as a reference, and a digital analog The output signal from the conversion circuit is input and compared with the data in the second comparison data storage circuit, and when they do not match, the second Those with analog abnormality detection circuit having an analog comparator circuit for outputting an alarm signal.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The image control device 20 shown in FIG.
From the video data output device 10, an analog-digital conversion circuit (A-D conversion circuit) 4 that converts the analog image data input from the video data output device 10, and a digital signal received by the reception circuit 1. A storage circuit 2 that stores image data or a digital signal input from the A / D conversion circuit 4 for each pixel of a red signal, a green signal, and a blue signal (RGB signal), and an RGB signal stored by the storage circuit 2. Abnormality detection for determining the cause when an abnormality occurs in the display image, in addition to the digital-analog conversion circuit (DA conversion circuit) 3 for converting the The circuit 21 is provided.

The image abnormality detection circuit 21 is composed of a digital abnormality detection circuit 22 and an analog abnormality detection circuit 23. The digital abnormality detection circuit 22 stores a comparison data storage circuit 5 that stores digital image data designated in advance for each signal of RGB signals in pixel units, and an RGB signal in pixel units output from the storage circuit 2. The digital comparison circuit 6 compares the RGB signal output from the comparison data storage circuit 5 in pixel units. The analog abnormality detection circuit 23 stores the analog image data designated in advance for each pixel of RGB signals in pixel units, and the pixel data output from the DA conversion circuit 3 in pixel units. An analog comparison circuit 8 for comparing the RGB signal with the pixel-by-pixel RGB signal output from the comparison data storage circuit 7.

Next, the operation of the image control device 20 configured as described above will be described.

The storage circuit 2 stores the output signal of the receiving circuit 1 which receives the digital image data from the communication line 13 as a plurality of bit data for each pixel of the RGB signal in pixel units. The storage circuit 2 also includes a video data output device 1
A signal obtained by converting the analog image data output from 0 to a digital signal in the A / D conversion circuit 4 is also stored as a plurality of bit data for each signal of the RGB signal in pixel units. The signal output from the storage circuit 2 is sent to the D-A conversion circuit 3 and at the same time, sent to the digital comparison circuit 6 of the digital abnormality detection circuit 22. Digital comparison circuit 6
Inputs the signal from the storage circuit 2 and the output signal of the comparison data storage circuit 5, which stores the predesignated digital image data for each pixel of the RGB signal in pixel units, and compares them. When the mismatch is detected, the alarm signal 11 is output.

The D-A conversion circuit 3 converts the output signal of the storage circuit 2 into an analog signal and outputs it to the display output device 9 and, at the same time, outputs it to the analog comparison circuit 8 of the analog abnormality detection circuit 23. The analog comparison circuit 8 outputs the signal from the D-A conversion circuit 3 and the output signal of the comparison data storage circuit 7 that stores the analog image data designated in advance for each of the RGB signals in pixel units. When input, compare them and detect inconsistency, alarm signal 1
2 is output.

When the alarm signal 11 is output, the digital image data received from the communication line 13 is abnormal, or an abnormality has occurred in the receiving circuit 1 or the memory circuit 2, causing color shift, shaking, or distortion. It can be determined that it has occurred.

When the alarm signal 12 is output, the analog image data output from the video data output device 10 is abnormal, or the receiving circuit 1 or the storage circuit 2 is present.
Alternatively, it can be determined that the color abnormality has occurred due to the abnormality of the D-A conversion circuit 3.

Alarm signal 11 and alarm signal 12
Is not output, and when the image displayed on the display output device 9 is abnormal, it can be determined that the display output device 9 has an abnormality.

[0019]

As described above, the image control apparatus of the present invention compares the digital data of the image data to be displayed and output with the reference digital image data, and outputs an alarm signal when they do not match. By providing an analog abnormality detection circuit that compares the analog data of the image data to be displayed and output with the reference analog image data and outputs an alarm signal when they do not match, There is an effect that it is possible to detect an abnormality in the image data such as a color abnormality, a shake, or a distortion. There is also an effect that it is possible to determine whether the cause of these abnormalities is due to a defect in the input signal, a defect in the display output device, or a defect in the image control device.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional image communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 receiving circuit 2 memory circuit 3 digital-analog conversion circuit (DA conversion circuit) 4 analog-digital conversion circuit (AD conversion circuit) 5.7 comparison data storage circuit 6 digital comparison circuit 8 analog comparison circuit 9 display output device 10 Video data output device 11/12 Alarm signal 13 Communication line 20 Image control device 21 Image abnormality detection circuit 41 Photomultiplier tube 42 Head amplifier 43 Analog control unit 44 A / D converter 45 Input side line memory 46 Input side line memory control unit 47 Output side line memory 48 Pulse shaping circuit 49 Modulation driver 50 Output side line memory Control unit 51 Control unit 52 Comparison circuit 53 Optical modulator

Claims (3)

[Claims] 1. A receiving circuit for receiving digital image data from a communication line, an analog-digital converting circuit for converting analog image data input from a video data output device into a digital signal, and the digital image data received by the receiving circuit. Alternatively, a memory circuit that stores the digital signal input from the analog-digital conversion circuit for each pixel of a red signal, a green signal, and a blue signal in pixel units, and the red signal, the green signal, and the memory stored by the memory circuit. When a digital-analog conversion circuit that converts a blue signal into an analog signal and outputs the analog signal to a display output device and the output signal from the memory circuit are input and digital image data serving as a reference is compared and they do not match, the first A digital abnormality detection circuit that outputs an alarm signal and the An image control apparatus comprising: an analog abnormality detection circuit which inputs an output signal from a digital analog conversion circuit, compares analog image data serving as a reference, and outputs a second alarm signal when they do not match. . 2. A first comparison data storage circuit which stores digital image data serving as a reference, and an output signal from the storage circuit which is inputted and compared with the data of the first comparison data storage circuit. The image control apparatus according to claim 1, further comprising a digital abnormality detection circuit having a digital comparison circuit that outputs a first alarm signal when they do not match. 3. A second comparison data storage circuit storing analog image data serving as a reference, and an output signal from a digital-analog conversion circuit are input and compared with the data of the second comparison data storage circuit. The image control apparatus according to claim 1, further comprising an analog abnormality detection circuit having an analog comparison circuit that outputs a second alarm signal when they do not match.