JPS62135086A - Picture processing method - Google Patents

Abstract

PURPOSE:To prevent a reproduced picture from going to vague and to improve the quality of a picture by comparing a picture information to be processed with a picture information preceding by a specific amount of time, then processing the picture information by using the picture variation information obtained by the said comparison. CONSTITUTION:A picture information inputted to a picture processor 2 from a picture receiver 1 is distributed to a variation-amount detecting circuit 2a and a picture processing circuit 2b. In the circuit 2a, a storage which is capable of storing the picture information for one picture frame or more is provided. The picture information at the time of the immediately preceding detection of variation-amount, is stored in the said storage, and compared with the picture information that is inputted at the time of the following variation-amount detection. The detected amount of variation is inputted to the processor 2. By using the inputted picture-variation information, the circuit 2b selects a picture processing procedure and processes the picture information. For instance, the integral time constant is made small when the movement of an object is fast, but large when slow. In such a way, the picture processing can be executed in consideration of the improvement of S/N that is the merit of an integral processing and an afterimage that is the demerit of said processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image processing method in an image transmission system, and for example, to an image processing method suitable for an image information processing apparatus when a subject moves or changes.

[Background of the invention]

Image processing is performed to improve the reproduction quality of image information. If the image information generation conditions remain unchanged, once the optimal image processing procedure is determined, there is no need to change the procedure. Here, the image information generation conditions include the movement of the subject, the degree of illumination, noise caused by the transmission system, and the like. Conversely, this means that if the generation conditions change, the optimal image processing procedure will also differ. For this reason, for example, the Journal of the Institute of Electrical Engineers of Japan (Showa 6
May 0, P439-P442) "Image processing in non-destructive testing" As shown in "Image processing in non-destructive testing", if the subject is stationary, the S/N ratio of the reproduced image can be improved by integral processing. For example, in the case where the subject is vibrating, performing the integral processing suppresses fluctuations in both image information due to the vibration of the subject, resulting in a reproduced image being blurred and the image quality being degraded.

In this way, the conventional method performs image processing while keeping the image information generation conditions unchanged, so if the generation conditions change, the image quality cannot be improved by one level using the previously applied image processing method. There was a problem that this occurred.

[Purpose of the invention]

An object of the present invention is to provide an image processing method that performs optimal image processing on image information whose generation conditions change.

[Summary of the invention]

The present invention attempts to achieve the object by comparing the image information to be subjected to image processing with the information before a specific time and processing the image information using the image change information obtained thereby. It is something.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of an image processing apparatus in which the present invention is implemented. In FIG. 1, reference numeral 1 denotes an image receiving device for receiving image information.

2 is an image processing device. The image processing device 2 includes a change amount detection circuit 2a that detects the amount of change in transmitted image information.
, an image processing circuit 2b that performs image processing corresponding to the amount of change;
and a monitor for displaying image information.

Next, an embodiment of the present invention will be described based on a processing procedure. Image information input from the image receiving device 1 to the image processing device 2 is distributed to the change amount detection circuit 2a and the image processing circuit 2b. The change amount detection circuit 2a is provided with a storage device that can store image information for 11 or more image frames, and the image information at the time of the previous change amount detection is stored in the storage device and inputted at the next time of detection. Compare with the image information provided. The detected amount of change is input to the image processing circuit 2b. The image processing circuit 2b selects an image processing procedure using the input image change information, and processes the image information accordingly.

Next, how to determine an image processing procedure for image change information will be explained based on integral processing, which is one method of image processing. If the subject is stationary, the SN ratio of the image can be improved by integral processing. Furthermore, the larger the integration time constant (in the case of processing, the number of integrations), the more the SN ratio can be improved. However, if the subject is moving, increasing the integration time constant will cause an afterimage in the reproduced image. How fast the subject is moving can be estimated from the image change information.

Therefore, when the subject is moving quickly, the integration time constant is set small, and when the subject is moving slowly, the time constant is set large. In this way, it is possible to realize image processing that takes into account the advantage of integral processing, which is an improvement in the SN ratio, and the disadvantage, which is afterimage. The above explanation uses integral processing, which is one of the image processing methods, but there are various other image processing methods that have been proposed, and the image processing method can be changed in response to the amount of change in image information. can also be considered.

In the present invention, in order to detect the amount of change in one image, the detection circuit 2a
has been established. When detecting the amount of change in an image, there are two methods: one in which two pieces of image information are compared pixel by pixel, and the other in image frame units. In implementing the present invention, a more appropriate amount of change can be detected by using two methods depending on the transmission system.

〔Effect of the invention〕

As described above, according to the present invention, image quality can be improved by image processing in a transmission system in which the conditions for generating image information change.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image processing apparatus according to an embodiment of the present invention. 1... Image receiving device, 2... Image processing device, 2a.
... Change amount detection circuit, 2b... Image processing circuit, 2c.
··monitor.

Claims (1)

[Claims] 1. In an image transmission system consisting of a plurality of image transmitting devices that transmit image information and a plurality of image receiving devices that receive the image information, the image receiving device stores image information at a certain point in time and information before a specific time from the point in time. 1. An image processing method, comprising: means for comparing the image information with image information; and means for processing the image information using image change information obtained by the means.