JPH0435478A - Video signal processor - Google Patents

Abstract

PURPOSE:To correspond to the change of a video source by storing a video signal from another video signal source in a memory after A/D conversion and reading out the content of this memory as the same form as a storage means. CONSTITUTION:A video signal reproduced from video equipment such as a VTR which can collect and edit the video source relatively easily and a still video, etc., is converted to a digital interface in accordance with a CD-ROM, and supplied to a host 6 by a CD-ROM interface form. Namely, from the viewpoint of the host 6, it is all right to correspond to only the CD-ROM interface form by converting the video signal to the digital interface in accordance with the CD-ROM, the video equipment such as the CD-ROM and the VTR, etc., can be used together. Thus, the control is simple because the form of the signal is adjusted to that of one side in the case of utilizing plural kinds of a video signal source.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a video signal processing device, and particularly to a device equipped with a large capacity storage means such as a CD-RON1.

(b) As an example of a conventional sales system for technical products, etc., for example,
As shown in No. 99948 (GO6F 15, '30), there is a method for displaying product images stored in microfilm. However, searching for microfilm takes time, and from the standpoint of compatibility with the computer (host) that controls the device, a configuration that uses a CD-ROM is highly desirable.

The CD-ROM has a large capacity, and since it is in a digital format, there is no deterioration in image quality, and the screen can be enlarged or reduced through processing.

However, since the CD-ROM is read-only, it cannot handle changes in the video source.

(c) Problems to be Solved by the Invention When changing the video source as described above, a new CD-
Re-creating the ROM - this is expensive and takes a long time to complete. Therefore, the image/−
CD-ROMs are convenient when the video source is relatively fixed, but CD-ROMs are not suitable for applications where video sources are frequently changed.

(d) Means for solving the problem Video sources can be collected and edited relatively easily\"Convert video signals played from video equipment such as TR and still video to a digital interface compatible with CD-ROM, It is supplied to the host in the form of a CD-ROM interface.

(e) Effect: By converting the working video signal into a CD-ROM compliant digital interface, from the host's perspective, the CD-ROM
It is only necessary to support the interface format, and CD-
It becomes possible to use ROM and video equipment such as a VTR together. In other words, for relatively fixed video software, C.
By storing video software in a D-ROM, and storing video software that changes frequently in a video device, and using both in combination, it is possible to compensate for the drawbacks of a read-only CD-ROM.

(F) Embodiment FIG. 1 shows a typical embodiment of the present invention. There are a plurality of input terminals, and a plurality of various video signals A (NTSC video signal, analog RGB signal, S terminal signal: y-c separated signals) are input to the signal selection/decoding section 1. Then, one type of signal is selected and converted to analog so that all the signals are in analog RGB format. The analog RGB video signal B is input to the A/D converter 3. A synchronization signal C obtained by synchronously separating the analog RGB signal B is input to a PLL circuit 2, and a sampling clock D locked to the synchronization signal C is generated. The sampling clock D is supplied to the AD converter 3, and the analog RGB video signal B is converted into digital RGB video data E.

The frame memory 4 is prepared for one frame each for RGB. Writing and reading from the memory is performed by a memory control signal N (-RD-WR-C5, memory address, etc.) output from the memory control signal switching section 11. The operation modes of the frame memory 4 are an external write mode in which video data is written in real time,
C to read video data using CD-ROM interface
There are two types of D-ROM interface modes.

For each mode, the frame memory control signal generator 9 generates an external write memory control signal from the CD-ROM.
An interface control signal generating section 10 generates a CD-ROM interface memory control signal N1, which is supplied to a memory control signal switching section 11.

A capture range designation command and a video capture command are sent from the host 6 through the CD-ROM interface G, and a command H is written into the command register 7 via the interface buffer 5. When command H is written, interrupt I is generated to CPU8, and CPU
U8 reads the contents of the command as command data J.

When the CPU 8 interprets the command, it first inputs the switching signal K to the memory control signal switching unit 11 to select the external write mode, and the external write memory control signal is supplied to the frame memory 4 as the memory control signal N, and the video Data is written in real time. Thereafter, the CP 8 sets the switching signal K to the CD-ROM interface mode, the CD-ROM interface memory control signal is supplied to the frame memory 4 as a memory control signal input, and the video data F is transferred to the host 6 in the CD-RONi interface format. is read out.

FIG. 2 shows an example of the structure of the frame memory. Effective pixels for one frame of NTSC signal are 640 (horizontal direction) x 4
80 (vertical direction) and perform 8-bit quantization, the data capacity will be 640 x 480 x 3 = 921.6 pied? ,, le. ]024×128 bytes (=Using 4 memories of IM bit j and applying harm IJ+ to one frame of R), for R, 1024 (H'+x51.2(VJ
memory can be configured. Moreover, since four units are used in parallel, data is serial-parallel (S/P) converted.
The memory access time is quadrupled, creating a margin in timing.

Therefore, by using 12 memories of 11024 x 12 bytes, a memory for one frame of RGB can be configured.

FIG. 3 shows the specifications of the CD-RON1 interface used here, and FIG. 4 shows a timing chart.

To send a command, set -D S E L O~2 low, put the command on DBO~7, and send DATA/-
Send the command by bringing CMD and -WR low. To read the status (indicating the status of the slave), use 5TATUSEN on the slave side (CD-ROM drive).
Wait until -RD goes low and read. When reading data (including video data), wait until -DATAEN on the slave side goes low, then set -RD low and read the data sent from the CD-ROM on DBO~7.

As described above, since the CD-ROM interface does not have a signal for specifying a memory address, it is necessary to specify the capture range in advance using a command.

Next, the commands necessary to import video data are shown.

(1) Capture range specification command Specifies the range of data that can be read in advance. For example, specify from 30 lines of R to 250 lines of B.

(2) Video capture command Captures the input video signal into the frame memory in real time, and then allows the host to continuously read the video data in the specified range.

(3) Status read command The host can read the slave status.

(4) Reset command Perform a software reset.

FIG. 5-1.5-2 shows an operation flowchart of the CPU in the case of video capture. Next, the operation will be explained according to this flowchart. At start 20, CPL:
8 initializes the system and enters a state of waiting for an interrupt (21). As described above, when a command is sent from the host, the CPU 8 is interrupted, and it is checked whether the type of command is a capture range designation command (22).

The capture range specification command specifies the read range from the memory corresponding to R, G, and B, and the range is described as a parameter of the command.

If the given command is a capture range specification command, the specified range is specified (save) (23), and the process returns to the state of waiting for an interrupt (24). When a command is sent, it is checked whether the command is a video capture command (25). If YES, the CPU 8 sets the frame memory 4 to external write mode (26)
. Then, the video signal is loaded into the frame memory 4 (27).

The video signal is captured based on the synchronization signals (horizontal and vertical) in the input video signal, and R, G, and B signals are written to predetermined locations in the memory (27).

When the capture of the video signal is completed, the CPU 8 sets the frame memory to the CD-ROM interface mode (28) and sequentially sends the data to the host (29). Then return to the start (30).

Among the above commands, the video import command is for CD-R
It is also used when reading data from OM. Therefore, when the host requests an image from the storage means, a video capture command is always output, and the storage means is transferred to a CD-R.
OM or other media (e.g. 8 mm VTR,
1/2 VTR, video floppy, etc.), a capture range designation command is output. In other words, the data obtained from the frame memory 4 is
Not only is this the same as in the case of M, but there is also a commonality in the commands from the host. So, from the host's perspective,
Devices such as CD-ROMs and video floppies can be used with little distinction.

As a video signal source other than a CD-ROM, a video signal recording and reproducing device using a VTR or a video floppy as described above can be considered. Alternatively, it may be a video signal transmitted from a predetermined transmission base. Furthermore, control of the reproduction operation of the signal source, etc. may be performed by the host computer.

(g) Effects of the invention As mentioned above, according to the present invention, when using multiple types of video signal sources, the signal format is matched to one of the systems, so control is simple and effective. There is.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the embodiment, Fig. 2 is a block diagram showing the configuration of the frame memory, Fig. 3 is an explanatory diagram showing the CD-ROM interface specifications, Fig. 4 is a timing chart, and Fig. 5 is a flow chart. It is. 3...AD converter, 4...frame memory, 6...
Host computer, 8...CPU.

Claims (1)

[Claims] (1) In a video signal processing device equipped with a large-capacity storage means, a video signal from another video signal source is AD converted and stored in a memory, and the contents of this memory are read out in the same format as the storage means. A video signal processing device characterized by: