JPH01128164A - Compression ratio changing circuit - Google Patents

Abstract

PURPOSE:To automatically set a compression ratio in accordance with the number of pieces of still pictures and to effectively monitor the compression ratio by using a circuit which counts the number of reproduced addresses to be stored and a means which prescribes the compression rate of a reproduced still picture in response to the count value of said counter circuit. CONSTITUTION:In a control circuit 4 a memory control means 8 stores the reproduced addresses into an address memory 10 via the input of a key word 6 and a floppy disk 2 and with the coincidence output obtained during retrieval of a key word. Then a counter circuit 9 counts the coincidence output number (x). A compression ratio deciding circuit 12 decides the value (n) that satisfies (n-1)<2x<=n. The reproduced still picture video signals are supplied to a video processing circuit 3 from a video disk player 1 to undergo the YC separation and the A/D conversion. In this case, a write control circuit 13 sets the conversion clock cycle at 1/n and stores it into a picture memory 17. Then X pieces of still pictures are read out by a read control circuit 19 and displayed with compression in (n<2>) pieces of sections of a monitor TV 5 via a video signal production circuit 20. These still pictures are stored in and read out of the memory 17 with no compression in case a specific code is selected by a picture selecting means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION C(a) Industrial Application Field The invention relates to a compression ratio changing circuit included in an image file system for compressing and storing a plurality of still images and displaying them separately.

(q Conventional technology Regarding an image file system for reproducing a plurality of still images, for example, Japanese Patent Application Laid-Open No. 61-264448 CG06F
12100).

This technology has an entire compressed video storage area in addition to the still image storage area in the image file device. When storing still images, the entire compressed video is formed, the still image video and compressed video are stored in both areas, respectively, and searched. The purpose is to display multiple compressed videos on the same monitor screen to facilitate search.

G-1 Problems to be Solved by the Invention However, the above-mentioned prior art requires means for forming and recording compressed video, resulting in a complicated configuration, and the compression ratio of the compressed video signal to be played back cannot be completely changed. Due to the number of still images to be displayed, it is not possible to change the entire size of the display.

Therefore, the present invention completely compresses the reproduced still images when displaying them, and changes the compression ratio in accordance with the number of still images to be displayed. Keywords and addresses corresponding to still images?Replay and store all playback addresses with playback keywords that match the specified keyword, and compress and split display all still images to be played back on the same monitor screen according to the stored playback addresses. In an image file system, a counting circuit for counting the number of stored playback addresses, and a compression ratio specifying means for specifying a compression ratio of a playback still image video signal according to this count value, are provided.Characteristics According to the present invention, the compression ratio of the reproduced still image video signal is changed according to the number of still images to be displayed.

(f) Example DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained according to fully illustrated embodiments.

Is Figure 1 an example of non-invention? The explanation will be given according to the circuit block diagram shown.

The video disc record played in this embodiment is
A large number of still image video signals and all address codes are recorded on spyful-shaped recording tracks.

This video disc player, which plays all optical video disc records, compares the input specified address data with the playback address code, searches all the playback addresses corresponding to the specified address, and searches all the playback still images corresponding to the playback address. It is for selective derivation. In addition, the floppy disk has address data and keywords corresponding to each still image video signal recorded in advance.
The floppy disk recorder 12+ that plays back this floppy disk sequentially plays back address data and corresponding keywords □The operation of this embodiment will be explained below.
This will be explained according to FIG. First, keyword generation means (61
Use all keyboard operations to specify all keywords. The specified keyword is the control circuit (
On the other hand, the reproduction keyword and reproduction address data which are input to the floppy disk recorder 12]J: during the keyword search are input to the control circuit 14+ in sequence. In the control circuit +41, a keyword comparison means f
7+ compares the specified keyword with the sequentially input reproduction keywords. If the playback keyword matches the specified keyword as a result of the comparison, the matching output is input to the memory control means (8) and the counting means (91).The memory control, !f:
The counting circuit (81 stores all the playback address data corresponding to the playback keyword in the address memory fIO+ every time a match output occurs during the keyword search period.The counting circuit 91 stores all the playback address data corresponding to the playback keyword in the address memory fIO+ every time a match output occurs during the keyword search period. Count.

When the keyword search is completed, the reproduced address data corresponding to the specified address data is stored in the address memory flO+, and the number of data is counted by the counting means (9).

The count value of this counting means 19) is calculated by the compression ratio determining means a21
The compression ratio determining means 121 inputs the counted value x
(n-1)2 x X≦n2 (where n is an integer from 1 to 8) Find data n2 that fully satisfies □ This data n is input to the write control circuit □ This write control @ J bribe [13
1, AD conversion cycle '2 based on data n
Write address change cycle n times? Specify n times □ On the other hand, the specified address data generation means σB is at L/X
All playback address data in the memory is input to the video disc player 11+ as designated address data. □Video disc player (11 searches all the address codes corresponding to this designated address data, and processes the corresponding playback still image video signal for all video processing circuits. 131F!: Enter., 1
When the reproduced still image video No. 6 for the screen is derived, the reproduction end output is input to the specified address data generation means (111), and the specified address data generation means αB reads out the next reproduction address data from the entire address memory 1ltl area and specifies the All address data is updated.Such search operation is repeated until all reproduced address data in the address memory ON is read out.

The reproduced still m video signals that are sequentially read out are passed through a YC separation circuit (
This YC separation circuit 05) which is input to 151 demodulates all the modulated color signals to form all the color difference signals, and the Y signal, (
RY) signal, (8-YJ signal 3 signals are input to the 2AD conversion circuit port θ, and the write control circuit Q3 inputs all AD conversion clocks and signals to this AD conversion circuit σe, Y,
(RY), Y, (8-Y), Y, (RY),...
AD conversion is performed in this order.

This AD conversion clock has a period 'k 1/n, and n
AD converts the reproduced still image video signal once per line □ This AD conversion data is stored in the image memory, but its write address corresponds to the address where the compressed video is to be displayed. It is specified. The read control circuit a9 specifies all the read addresses of the image memory an and reads out all the ADI conversion data in the field period. The read AD conversion data is sorted by information and converted into analog data in the DA conversion circuit (t81).The DA converted Y signal, (
The R-Y) signal and the CB-Y) signal are sent to the video signal forming circuit (2).
Synchronization signal and identification number pattern signal for each screen in 01? Figure 2 schematically shows the entire case when 16 still images are displayed on the screen of this monitor TV 15+ together with the ap katsu identification pattern. ing.

With such a status paddle, the operator selects a specific identification number by the image selection means (1
41t-, the memory control means (81) inputs all the reproduction address data corresponding to the identification code to the specified address data generation means, and the reproduction address read out by the specified address data generation means (IIJ) becomes the specified address. As a result, the selected reproduced still image video signal is formed and derived from the video disc player. This reproduced still image video signal is stored and read out without being compressed in the image memory αB. As a result, the reproduced still image video signal is displayed on the monitor screen. , only the selected still image will be displayed as is on the monitor screen.

(G) According to the present invention, the compression ratio of still images is automatically set according to the number of still images to be displayed, and efficient monitoring becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram showing one embodiment of the present invention;
Each figure shows a schematic explanatory diagram of a monitor screen. (9)... Counting means, 02... Compression ratio determining means.

Claims (1)

[Claims] (1) a video reproducing device that searches a video recording medium on which still image video is recorded based on specified address data and reproduces the still image video corresponding to the specified address to derive a reproduced still image video signal; an information reproducing device for reproducing an information recording medium recording address data and keywords corresponding to a still image video; a comparing means for comparing a designated keyword issued by a keyword generating means with a reproduction keyword issued by the information reproducing device; an address memory for storing corresponding reproduction address data at a timing when the comparison means issues a coincidence output; and designated address data generating means for inputting the readout output of the address memory and inputting the designated address data to the video reproduction device; In an image file system comprising video storage and reading means for storing a plurality of reproduced still image video signals at a predetermined compression ratio and displaying the plurality of still image video signals in a divided manner when read out, the coincidence output is counted. A compression ratio changing circuit comprising: a counter for determining the compression ratio; and a compression ratio defining means for inputting the counted value of the counter to define the compression ratio.