Picture introducing apparatus

Details Picture introducing apparatus Picture introducing apparatus

1988-01-27

1989-03-07

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 21R, H04N 514

Patent

active

048110981

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a picture processing apparatus for processing picture information introduced from a picture input unit such as an industrial camera by a raster scanning system.
2. Description of the Related Art
When one frame of a picture of a CRT display is introduced into a picture processing apparatus from a picture input unit (hereinafter referred to simply as a "camera") such as an industrial camera by a raster scanning system, the picture signal outputted by the camera comprises one vertical synchronizing signal VSYNC for establishing synchronization of a picture in the vertical direction, a plurality of horizontal synchronizing signals HSYNC for establishing synchronization of the picture in the horizontal direction, and a luminance signal PCSG which includes significant picture information. FIGS. 3(a) and (b) illustrate an example of a general picture signal waveform. FIG. 3(a) is a time chart of a signal waveform corresponding to one frame, and FIG. 3(b) is a time chart regarding one line in the horizontal direction.
The luminance signal PCSG is effective in a significant picture information interval PCPD, and the significant picture information interval PCPD is provided in sychronization with each horizontal signal HSYNC. In other words, the signficant picture information interval PCPD starts a predetermined period of time (the front porch time FP) after the horizontal synchronizing signal HSYNC is produced.
The front porch time FP from the horizontal synchronizing signal HSYNC to the start of the significant picture information interval PCPD generally differs from one type of camera to another. Since the conventional apparatus for introducing the picture is designed solely for a specific type of camera, the front porch time FP is set so as to conform to the picture signal from the camera. Accordingly, if a picture from the camera of a different type is to be introduced using the conventional picture introducing apparatus, the front porch time FP will not conform. As a result, the picture signal will not be introduced in a faithful and accurate manner.


SUMMARY OF THE INVENTION

The present invention has been devised in order to solve the foregoing problem and its object is to provide a picture processing apparatus in which significant picture information can be introduced in an accurate manner by bringing the front porch time into conformance with cameras of a variety of different types.
In accordance with the present invention, a picture processing apparatus which solves the problems of the prior art is provided, which comprises a picture memory section for storing a picture signal, storage means for storing a front porch time extending from generation of a horizontal synchronizing signal of a picture signal until start of a significant picture information interval, calculating means for calculating the starting time of the significant picture information interval by referring to the stored front porch time, and introducing means for introducing significant picture information into the picture memory section from the timing of the starting time of the significant picture information interval calculated by the calculating means.
In accordance with the picture processing apparatus of the present invention, front porch time extending from generation of the horizontal synchronizing signal until start of the significant picture information interval is stored, and the significant picture information is introduced by calculating the starting time of the significant picture information interval by referring to the stored front porch time. Therefore, even if the front porch time differs depending upon the type of picture input unit, different picture input units can be dealt with by storing the front porch time corresponding to the picture input unit. This makes it possible to introduce the significant picture information in an accurate manner.
The calculation of the starting time of the significant picture information interval performed

REFERENCES:
patent: 4723163 (1988-02-01), Skinner
patent: 4751573 (1988-06-01), Kubota

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