JP2001136548A - Monitor device for objective evaluation of image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor device for image objective evaluation, which improves the operation efficiency of monitoring operation an image and an image quality evaluation value for objective image quality evaluation and reduces the troublesomeness of wiring. SOLUTION: This monitor device 5 for objective evaluation has a subjective evaluation monitor part 6 and a image quality evaluation board 7, which includes an image quality evaluating device, and those are put in one housing. Two input terminals for an A and a B channel, to which a source image and a processed image are inputted, are shared by the subjective evaluation monitor part 6 and image quality evaluation board 7. At a display part 8 of the subjective evaluation monitor part 6, the source image and processed image, and an image quality evaluation result are displayed close to one another. Consequently, an operator is able to observe the images and image quality evaluation result within single visual field and the operation efficiency is improved. Furthermore, the troublesomeness of wiring is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor apparatus for objectively evaluating an image, and more particularly to a monitor apparatus for objectively evaluating an image which can greatly improve the efficiency of an objective image quality evaluation operation performed for monitoring image quality.

[0002]

2. Description of the Related Art Conventionally, methods for evaluating image quality include a subjective evaluation by a human and an objective image quality evaluation using an image quality evaluation device. In the former subjective evaluation, a method of putting an original image and a processed image into channels A and B of an image monitor, respectively, and switching between the original image and the processed image with a switch for evaluation is often adopted. On the other hand, in the latter objective evaluation, the image signals of the original image and the processed image are supplied to the image quality evaluation device and also supplied to the monitor, and the objective image evaluated by the image quality evaluation device while checking the image displayed on the monitor is checked. A method of monitoring image quality evaluation is often used.

FIG. 4 shows a schematic configuration of the latter objective image quality evaluation apparatus. The original image output from the original image supply device 1 such as a VTR is connected to the A channel of the subjective evaluation monitor device 2 and the A channel of the image quality evaluation device 3 provided separately therefrom. The original image is supplied to the processing device 4 and processed by the processing device 4. This processing device 4
Is composed of a compression encoding device and the like. The original image processed by the processing device 4 is connected to the B channel of the subjective evaluation monitor device 2 and the image quality evaluation device 3 as a processed image.

When a worker evaluates the quality of a processed image by using the objective image quality evaluation apparatus, the worker switches between the original image and the processed image by a switch provided in the subjective evaluation monitor device 2 and processes the original image and the processed image. An operation of monitoring the image quality evaluation value displayed on the image quality evaluation device 3 is performed while comparing and confirming the images.

[0005]

As described above, when an operator evaluates the quality of a processed image using a conventional objective image quality evaluation apparatus, the worker compares and confirms the original image and the processed image.
It is necessary to monitor the image quality evaluation value displayed on the image quality evaluation device placed at another position, so that there is a problem that the working efficiency is reduced and the labor of the worker is large. Also,
It is necessary to supply the original image and the processed image to both the subjective evaluation monitor device 2 and the image quality evaluation device 3. To this end, the original image supply device 1 and the Must be wired to both of the evaluation devices 3, i.e., two sets of wiring,
There is a problem that wiring is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems of the prior art, to improve the efficiency of monitoring an image for objective image quality evaluation and the image quality evaluation value, and to reduce the complexity of wiring. To provide an objective evaluation monitor device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a monitor for objectively evaluating an image for evaluating the quality of a processed image. A first feature is that an image quality evaluation unit for evaluating the image quality of the processed image is incorporated in the evaluation monitor device, and the subjective image quality evaluation result is displayed on the subjective evaluation monitor device.

[0008] Also, two input terminals to which the original image and the processed image are input, and image quality evaluation means for evaluating the processed image based on the original image and the processed image input from the two input terminals, Display means for displaying the original image and the processed image input from the two input terminals, and displaying the image quality evaluation result by the image quality evaluation means, and bringing the image and the image quality evaluation result close to the display means. There is a second feature in that the display is performed by displaying.

According to the first feature, the image display for the original image and the processed image and the display of the image quality evaluation result can be displayed in close proximity to each other. You will be able to observe. In addition, the second
According to the feature of (1), the wiring from the device for supplying the original image and the processing device for the original image only needs to be performed for the two input terminals. Will be able to

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention.

An original image output from an original image supply device 1 such as a VTR is sent to a monitor device 5 for objective evaluation and a processing device 4. The processing device 4 is composed of a compression encoding device and the like, and the processed image processed (for example, compression encoded) by the processing device 4 is sent to the objective evaluation monitor device 5. The objective evaluation monitor device 5 has two input terminals for A and B channels. The original image is supplied to the A channel input terminal, and the processed image is supplied to the B channel input terminal. .

The objective evaluation monitor device 5 includes a subjective evaluation monitor section 6 and an image quality evaluation board 7 on which an image quality evaluation device is formed.
And these are housed in a single housing. This housing may be the same as the housing of the conventional subjective evaluation monitor device 2. In other words, the image quality evaluation board 7 may be built in the housing of the conventional subjective evaluation monitor device 2. The two input terminals of the A and B channels are shared by the subjective evaluation monitor section 6 and the image quality evaluation board 7.

The subjective evaluation monitor section 6 has a demodulation circuit for demodulating the A and B channel images, and demodulates the A and B channel images. On the other hand, the image quality evaluation board 7 calculates the image quality evaluation value of the processed image based on the original image. The A and B channel images demodulated by the demodulation circuit and the image quality evaluation result output from the image quality evaluation board 7 are displayed on a display unit 8.
Sent to and displayed. The switch 9 functions to switch between an original image of the A channel and a processed image of the B channel displayed on the display unit 8. The display unit 8 includes a CRT, a liquid crystal display, a plasma display, and the like.

FIG. 2 is a view showing an example of a screen of the display unit 8. The image display area 8a on which the original image and the processed image can be selectively displayed by a switch 9 on one screen, and the image quality evaluation board. There is provided an image quality evaluation display area 8b for displaying the image quality evaluation value output from 7, for example, the degree of image quality deterioration. The switch 9 for switching the display of the image display area 8a may be provided inside or outside the display unit 8.

FIG. 3 is a block diagram schematically showing an example of a circuit configuration of the image quality evaluation board 7. As shown in FIG. As this circuit, for example, a circuit described in Japanese Patent Application Laid-Open No. 9-307930 by the present applicant can be used.

The A-channel original image is input to a subtractor 10 and an AC component power calculation circuit 11. The subtracter 10 subtracts the processed image of the B channel from the original image of the A channel, and calculates a difference value of each pixel signal. This difference value is S
The signal is input to the NR (WSNR) calculation circuit 12, and the NSR or WSNR of the entire frame is obtained. On the other hand, the AC component power calculation circuit 11 calculates the average value of the AC component power of the entire frame, that is, the activity of the entire screen, from the pixel signals of the original image. The weighting circuit 13 calculates the SNR (WSNR) output from the SNR (WSNR) calculation circuit 12 using a function having an average value of the power of the AC component as an element.
Alternatively, the image quality evaluation value is obtained by weighting the WSNR for each frame and output. Since the detailed circuit diagrams of the AC component power calculation circuit 11 and the SNR (WSNR) calculation circuit 12 of FIG. 3 are disclosed in the above-mentioned publication, the description will be omitted.

According to this embodiment, the operator appropriately switches the A and B two-channel images displayed on the image display area 8a of FIG. 2 by the switch 9, and subjectively evaluates the image quality of the processed image. With the same field of view, or by slightly moving the line of sight to the image quality evaluation display area 8b, the degree of image quality deterioration displayed in the image quality evaluation display area 8b can be seen. In other words, the worker can observe the objective evaluation value as the image quality evaluation result while comparing and confirming the original image and the processed image on the display device. Therefore, the operator does not need to see the subjective evaluation monitor device 2 and the image quality evaluation device 3 from different viewpoints as in the related art. The switch 9
May operate automatically without the help of a worker.

[0018]

As is apparent from the above description, according to the present invention, the image quality evaluation result is displayed on the display section of the subjective evaluation monitor device, or the image quality evaluation result is displayed close to the original image and the processed image. Since the display is performed, the operator can see both displays in the same field of view, and the objective image quality evaluation work for monitoring the image quality can be greatly simplified. In addition, it is possible to improve work efficiency and reduce labor of a worker. In addition, since the wiring from the original image supply device and the processing device to the monitoring device for objective evaluation can be completed in one set, the wiring amount can be reduced to half of the conventional wiring. In addition, the complexity of wiring can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a display example of the display device of FIG. 1;

FIG. 3 is a block diagram illustrating a circuit example of the image quality evaluation board of FIG. 1;

FIG. 4 is a block diagram showing a configuration of a conventional image quality evaluation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Original image supply apparatus, 4 ... Processing apparatus, 5 ... Monitor apparatus for objective evaluation, 6 ... Subjective evaluation monitor apparatus, 7 ... Image quality evaluation board, 8 ... Display part, 9 ... Switch.

Claims (3)

[Claims] 1. An objective evaluation monitor device for evaluating an image quality of a processed image, wherein a subjective evaluation monitor device for switching and displaying an original image and a processed image includes an image quality evaluation unit for evaluating the image quality of the processed image. A monitor device for objective evaluation of an image, wherein the monitor device is built-in and the image quality evaluation result output from the image quality evaluation means is displayed on a display section of the subjective evaluation monitor device. 2. A monitor for objectively evaluating an image for evaluating the quality of a processed image, comprising: two input terminals for inputting an original image and a processed image; an original image and a processed image input from the two input terminals; Image quality evaluation means for evaluating the processed image, display of the original image and the processed image input from the two input terminals, and display means for displaying the image quality evaluation result by the image quality evaluation means. A monitor device for objectively evaluating an image, wherein the image and the image quality evaluation result are displayed close to each other on the display means. 3. The objective evaluation monitor device according to claim 2, wherein wires from an original image supply device and an original image processing device are connected to each of the two input terminals. Monitor device for objective evaluation of images.