JPS62257576A - Video input system - Google Patents

Abstract

PURPOSE:To start video input with the waiting time of one scanning time at its maximum, by performing operations for implementing image indexes irrespectively of a video input request. CONSTITUTION:A video input interface 12 converts inputted video signals into digital image data and, at the same time, implements image indexes. Then the interface 12 transfers the implemented image index to an image memory 13 through a local bus 20. The above-mentioned operations of the video input interface 12 are always performed regardless of the presence/absence of any video input request from a CPU 17. The image memory 13 successively writes the image data in its storing area in accordance with the image indexes transferred from the video input interface 12. Therefore, the waiting time from the moment when a video input request is issued from the CPU 17 to the moment when the input is actually started can be reduced to one scanning time (about 63.5mus) at the maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a video input method suitable for inputting a video signal to an image quality processing device.

(Prior Art) Conventionally, the input (video input) of video signals from ITV cameras, VTR devices, etc. vertical synchronization signal).

For this reason, a maximum of one video time (approximately 33,113 seconds) is required from when a video input request is issued until input actually starts.

(Problems to be Solved by the Invention) As described above, in the past, there was a problem in which a maximum of one video period was required from when a video input request was issued until input actually started.

The present invention has been made in view of the above circumstances, and its object is to provide a video input method that can significantly shorten the waiting time from the time a video input request is issued until the input actually starts.

[Configuration of the invention 1 il! (Means and operations for resolving lfJ points) This invention performs the operation of converting an input video signal into digital image (9 data) and generating an image index regardless of a video input request, and when there is an image input request. , image data is written into the image memory based on the image index, and thus video input can be started with a waiting time of one scanning time at most.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of an image processing apparatus to which the present invention is applied. In the same figure, 11 is IT
A V camera (industrial television camera) 12 converts a video signal of, for example, NTSCI rated 2:1 interlace system inputted from the ITV camera 11 from analog to digital to obtain digital image data and generate an image index. Video input interface.

FIG. 2 is a diagram illustrating a video signal input from the ITV camera 11 to the video input interface 12. N
As is well known, the number of scanning lines of the TSC standard video signal is 5.
There are 25 pieces. The image index generated by the video input interface 12 defines the horizontal synchronization signal at the beginning of the odd field as 1'' and the horizontal synchronization signal at the end of the even field as °``525°'', as shown in Figure 2. This is the index information (identification information) of the scan line.

Referring again to FIG. 1, 13 is an image memory that stores image data, and 14 is an image processor that performs various processes on the image data. 15 is a display monitor for displaying the image processing results; 16 is a monitor output interface forming an interface for the display monitor 15;

17C Entire device tx+m+t CPU, 18
Gt CPU 17 Video input interface 12
, image memory 13, image processor 14, and monitor output interface 16. 19 is an image bus for high-speed image data transfer; 20
is a local bus for image index transfer. Video input interface 12, image memory 13, image processor 14 and monitor output interface 16 are interconnected by image bus 19. Further, the video input interface 12 and the image memory 13 are interconnected by a local bus 20.

Next, the operation of one embodiment of the present invention will be explained.

First, video input interface 1 from ITV camera 11
2, the video input interface 12 converts the input video signal into digital image data and simultaneously generates an image index. The video input interface 12 then transfers the generated image index to the image memory 13 via the local bus 20. The above-described operations of the video input interface 12 are always performed regardless of whether there is a video input request from the CPU 17 or not.

Now, when the CPU 17 requires video input (image input), it first sets up the image memory 13 via the υ control bus 18 in order to input image data to the image memory 13. As a result, the image memory 13 is connected to the image bus 1
9. Each manual driver gate (not shown) connected to the local bus 20 is turned on. Thereby, the image memory 13 can take in the image index transferred from the video input interface 12 via the local bus 20, and can recognize the current scanning position of the video signal.

After completing the setup of the image memory 13, the CPU 17 issues a video input request to the video input interface 12 via the vll all bus 18. The video input interface 12 immediately turns on an output driver gate (not shown) connected to the image bus 19 in response to a video input request from the CPU 17, and outputs a digital image obtained by converting the video signal from analog to digital. Data image bus 19I! The operation of transferring the image to the image memory 13 is started.

The image memory 13 is connected to the image bus 19I! Based on the image index transferred from the video input interface 12 via the local bus 20, the image data transferred from the video input interface 12 via the local bus 20 is determined by the index ti! corresponding to the scanning position n. Write to the area sequentially with /v.

Therefore, according to this embodiment, at the latest, the image memory 1
3, it is possible to input from the first image data at the next scanning position of the scanning position indicated by the image index first transferred, so inputting actually starts after a video input request is issued from the CPU 17. The waiting time for this is only one scanning time (approximately 63.5 μs) at most.

In the above example, general video input was explained, but the present invention can also be applied to image input from a camera using a strobe or image input from a shutter camera. In this case, the video signal is limited to 1:1 interlacing, but conventionally the leading index (vertical synchronization signal timing) of the video signal was used as shutter timing and robot timing, but these timings are
At the latest, it can be a scanning position following the scanning position indicated by the image index first transferred to the image memory.

[Effects of the Invention] As detailed above, according to the present invention, the operation of converting an input video signal into digital image data and generating an image index is performed regardless of a video input request, and when there is an image input request, Since the image data is written to the image memory immediately after the above image index, the waiting time from the time a video input request is issued to the actual start of input has been reduced from the conventional maximum of 1 video hour to the maximum. It can be shortened to one scanning time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an image processing apparatus to which the present invention is applied, and FIG. 2 is a diagram illustrating a video signal applied to the image processing apparatus of FIG. 11... rTV camera, 12... video input interface, 13... image memory, 17... CPU,
18... Suppression bus, 19... Image bus, 20...
local bus.

Claims (1)

[Claims] An image processing device that performs digital image processing includes an image memory that stores digital image data, converts a video signal into the digital image data regardless of a video input request, and generates an image index that identifies the scanning line of this video signal. a first transfer means for transferring the image index generated by the video input interface to the image memory; a first transfer means for transferring the image data converted by the video input interface to the image memory in response to the video input request; and a second transfer means for transferring to an image memory, the image memory storing the image data transferred by the second transfer means based on the image index transferred by the first transfer means. A video input method characterized by comprising: