KR950014337B1 - Moving picture detecting method and apparatus - Google Patents

Abstract

storing a reference field information by sampling m lines according to a vertical synchronization signal of a previous terminal, and sampling n pixels per line according to a horizontal synchronization signal of a previous terminal; storing a comparison field information by sampling the m lines according to the vertical synchronization signal of the previous terminal of a field, and by sampling the n pixels per line according to the horizontal synchronization signal of the previous terminal; comparing the pixel information per each line through the above steps; checking that the pixel information different from each other is over a predetermined reference number; counting the number of lines in which the pixel information is over k in m lines; checking that the counted value is over a predetermined reference number P (0<P<m); counting lines in which the different lines is over P; counting the number of comparisons for the reference field information and the comparison field information; checking the comparison operation by l-th number; if it is not finished, returning to the second step; if it is finished, checking that the compared value is over a predetermined reference information q (0<q<l); if it is below q, initializing the counted value and returning to the second step; and if it is over q, detecting that an image signal provided in the first step, is the right image signal for a subject.

Description

Dynamic image detection method and apparatus

1 is a system diagram of an apparatus for implementing a moving picture detection method according to the present invention.

2 is a circuit diagram of a moving picture detection apparatus according to the present invention.

3 is a main partial input and output waveform diagram for explaining the operation of the moving picture detecting apparatus according to FIG.

4 is a data flow chart for realizing a moving picture detection method according to the present invention.

* Explanation of symbols for main parts of the drawings

10: low pass filter means 20: analog / digital converter

30: synchronous separator 40: field superior / cardinal detector

50: vertical sampling signal generating means 60: horizontal sampling signal generating means

70: sampling start signal supply means 80: microprocessor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for detecting a moving image, and more particularly, to a method and apparatus for detecting a video signal, ie, moving image, for a moving subject in a VCR, a video camera, and the like.

Generally, a video signal for a non-moving subject is called a still picture signal, and a video signal for a moving subject is called a video signal. The moving picture signal also includes a video signal caused by the movement of a video camera with respect to a fixed subject. The moving picture signal refers to a video signal whose image information changes with time.

Therefore, the technique of detecting whether the input video signal is a still image signal or a moving image signal can be very wide in its application in image processing. For example, if the video signal for adjusting the picture of a broadcasting station is recorded by two VCRs within the time that the broadcaster is sending out, one of the VCRs continues to record on the other side while the blue screen is played after the tape is finished. Is recorded on the tape, and the tape is wasted. After editing, it is cumbersome and inconvenient to find the recorded part due to the color screen section.

Accordingly, an object of the present invention is to provide a moving picture detection method and apparatus capable of detecting whether an input video signal is a still picture or a moving picture signal.

The present invention for achieving the above object is characterized by consisting of the following process.

The first step is: storing the reference field information by sampling m pixels according to the leading horizontal synchronizing signal of each line while sampling m lines according to the leading vertical synchronizing signal of a field of the supplied video signals.

Second process A process of storing m field lines by sampling m lines in accordance with the leading synchronizing signal of a subsequent field located at an integer multiple from the reference field and sampling n pixels per line according to the front horizontal synchronizing signal of each line. .

Third step The pixel information different from the n pieces of pixel information by comparing the pixel information of each line network of the first process with the pixel information of each line of the second process is a preset constant k (where O <k <n). And counting the number of lines in which m or more pixel information is incorrect in m lines.

Fourth step Examining whether the count value of the third step is equal to or greater than a preset reference constant P (where 0 <P <m), and counting the number of comparison fields whose number of lines different from the reference field among m lines is P or more. process.

A fifth step of counting the number of comparisons between the reference field information and the comparison field information in the fourth process and checking whether the preset one-time field comparison is completed and returning to the second process if it is not completed.

Sixth process When the first field information comparison is completed in the fifth process, it is checked whether the count value of the fourth process is greater than or equal to a preset reference constant q (0 <q <1). Initializing a count value of the process and returning to the second process.

7. The process of detecting that the video signal supplied in the first process is a moving picture signal if q or more in the sixth process.

The most suitable device for carrying out the method according to the present invention is to separate vertical and horizontal synchronous signals from a composite video signal supplied by a synchronous separator, and to receive the separated vertical and horizontal synchronous signals to a field superior / oddity detector. And generate a vertical sampling signal for sampling a horizontal line in a vertical image signal section by receiving the vertical and horizontal synchronization signals through a vertical sampling signal generating means, and detecting the even field of the field even / odd detector. In order to sample the pixel information in the horizontal line sampled by the vertical sampling signal, a horizontal sampling signal is generated by the horizontal sampling signal generating means, and the sampling start signal supply means is provided at the leading end of the even field when detecting the even field of the field excellent / odd detector. A vertical synchronization signal is generated as a sampling start signal and the composite image signal is generated. The luminance signal in the call is digitally converted to the analog / digital converter by the horizontal sampling signal, and the pixel information of the line corresponding to the vertical sampling signal is read from the analog / digital converter every time the sampling start signal is applied. Storing field information, and comparing the next very number field information with the reference information using the first excellent field information stored first as the reference information, and comparing the number of dissimilar judgments with respect to the number of constant comparison results. As a result, it is characterized in that the microprocessor detects whether or not the supplied video signal is a moving picture signal.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a system diagram of a method for detecting a moving image according to the present invention. In FIG. 1, the moving picture detection method of the present invention comprises the steps of sampling and storing reference field information from a supplied meditation signal (100), and sampling and storing comparison field information to be compared with the reference field information (101); Comparing the reference field information with the comparison field information and counting the wrong number of lines (102), counting the number of comparison fields having the least number of consecutive delays (103), and comparing the reference fields. Counting the number of comparison times of the field 104, and if the count value of the comparison number reaches a preset value in step 104, if the number of the comparison field is more than a predetermined number of lines, the count value of the process 102, 103, 104 In step 105, the process returns to the process of sampling and storing the comparison field information, and in step 104, the count value of the non-recovery number is not sufficient. Constitute a process 106 for detecting that the number of wrong line video signal is a moving picture signal supplied is above can set the number of comparison field is not less than the predetermined time is reached at the set value.

In step 100, it may be desirable to obtain field information on the luminance signal by filtering the luminance signal of the image signal. FIG. 2 is a circuit diagram of a moving picture detection apparatus particularly suitable for carrying out the method of the present invention, and FIG. 3 is a waveform diagram of each part of FIG. In FIG. 2, the composite video signal supplied to the input terminal IN is input to the low pass filter means 10 and the synchronous separator 30 in the same waveform as in FIG. 3 (1). In the present invention, only the luminance signal of the input composite video signal is passed to the analog / digital converter 20 to be supplied.

The synchronous separator 30 separates the vertical and horizontal synchronous signals of the input composite video signal and outputs them respectively. The vertical and horizontal synchronous signals are supplied to the field even / odd detector 40 and the field excellent / odd detector 40. In case of detecting the phase relationship between the vertical synchronous signal and the horizontal synchronous signal, if the phase of the vertical synchronous signal and the horizontal synchronous signal is the same, it is determined as the even field, and if not, it is determined as the odd field.

Therefore, the field even / odd detector 40 generates a "high" signal when the even field is judged and a "low" signal when the odd field is determined, resulting in a waveform as shown in FIG. In addition, the vertical and horizontal synchronization signals are supplied to the vertical sampling signal generating means 50, and the vertical sampling signal generating means 50 generates a vertical sampling signal for sampling the horizontal line in the vertical video signal section.

A first pulse signal having a pulse width to the front end of the vertical video signal is generated by the CR time constant of the first monostable multivibrator 51 triggered at the front end of the vertical synchronization signal. ) And has a pulse width of a. The second pulse signal having the pulse width of the vertical video signal section is generated by the CR time constant of the second monostable multivibrator 52 triggered at the rear end of the first pulse signal. It appears as (3) and has a pulse width of b. Further, as shown in FIG. 3, the third pulse signal having the pulse width up to the tip of the horizontal luminance signal is generated by the CR time constant of the third single-stable multivibrator 53 triggered at the tip of the horizontal synchronization signal. The waveform is shown as (7) of FIG. 3 and has a pulse width of c. A fourth pulse signal having a pulse width of the horizontal luminance signal section is generated by the CR time constant of the fourth single-stable multivibrator 54 triggered at the rear end of the third pulse signal. It appears as follows and has a pulse width of d. When the fourth pulse signal is counted by the N binary counter 55 which is cleared by the second pulse signal, and the outputs of the N binary counter 55 all become " high ", vertical sampling in synchronization with the horizontal sampling signal described later. The signal is outputted through an AND logic gate 56 and a NOT logic gate 57, as shown in FIG. 11 (11). For example, if the N-ary counter 55 is a hexadecimal counter, it generates a vertical sampling signal that just sends 15 horizontal lines and samples the 16th horizontal line, and is the multiple of 16 of the 262 horizontal lines in one field, that is, 262/16. Only lines with = 16 bits will be sampled.

The horizontal sampling signal generating means 60 is horizontal for sampling pixel information in the horizontal line sampled in the vertical video signal section of the vertical sampling signal generating means 50 when the even field detection of the field even / odd detector 40 is performed. Repeat the sampling signal. This logically transforms the waveforms (3) and (8) in FIG. 3 of the second and fourth pulse signals to the AND logic gate 61 to determine the horizontal sampling operation time. The waveform is shown in FIG. Only when the AND logic gate 61 output signal is in the "high" state, a horizontal sampling signal having a constant frequency according to the CR time constants of the resistor 62b and the capacitor 62c of the oscillation means 62 is shown in FIG. Outputs the same waveform as (10).

On the other hand, the sampling start signal supplying means 7 logic the vertical synchronization signal and the output signal of the field even / odd detector 40 by AND logic to sample the leading vertical synchronization signal of the even field as shown in (5) in FIG. Output by start signal.

When the sampling start signal is applied, the microprocessor 80 reads pixel information of a line sampled by the vertical sampling signal from the analog / digital converter 20, stores even field information, and stores the first even field first. By using the information as reference information, the next very large field information is compared with the reference information, and it is determined whether a video signal supplied as a ratio of dissimilar judgment times for a constant comparison number is a moving picture signal or a still image signal. Detect. The analog / digital converter 20 receives the horizontal sampling signal and digitally converts the luminance signal input to the microprocessor 80.

4 is a flow chart performed by the microprocessor of FIG. Referring to Figures 2 to 4 will be described the operation and effect of the present invention.

When the moving picture detection mode is started, the microprocessor 80 initializes the addressing A register value of the storage location to store the reference field information to "0" and resets the addressing B register value of the storage location to store the comparison field information to "M + 1." ", And initializes the first to third internal counter values (200).

The first internal counter is for counting the number of lines that do not have similar pixel information among the lines of the reference field and the comparison field, and the second internal counter is for counting the number of comparison fields that are not similar to the reference field. The third internal counter is for counting the number of comparison fields compared with the reference field.

If the field of the supplied video signal is an even field, the sampling start signal (see D waveform in FIG. 4) is supplied from the AND logic gate 70 to the initial terminal of the microprocessor 80. When the sampling start signal is supplied to the microprocessor 80 (201), whenever the vertical sampling signal is supplied to the INTERTERP terminal (202), the line pixel information of the reference field supplied from the analog / digital converter 20 is supplied. Is stored in the address designated by the A register (203). Then, the A register value is increased by " 1 " (204), and steps 202 to 205 are repeated by the vertical sampling signal until the sampling start signal is input (205).

According to the repetition, reference field information is stored from memory change 0 to M address. The reference field information is vertically sampled with m lines, and n pixel information for each line is horizontally sampled.

On the other hand, each time the vertical sampling signal is supplied to the INTERRUPT terminal in the state where the B register value is initialized to "M + 1" after performing step 205 (step 206), the line pixel information of the comparison field is detected. Is stored in the address designated by the B register (208). Then, the B register value is increased by " 1 " (209), and steps 207 to 210 are repeated again by the sampling signal.

After performing step 210, the addressing A register value of the storage location to store the reference field information is initialized to "0", and the addressing B register value of the storage location to store the comparison field information is initialized to "M + r" (211). The value obtained by subtracting the address designation value of the B register corresponding to the A register from the address designation value of the A register is referred to as V (212).

If K is a small value where the difference in addressing values of the A and B registers is considered to be a similar pixel, the value of V performed in step 212 is compared with the K value (213). 1 "is added and stored in the A register again (214). If the last designated address value of the A register is M, it is checked whether the designated address value of the A register performed in steps 213 and 214 is M (215). If the designated address value of the A register is M, the value of the register register is "1". Add to and store again in the counter register (217). The counter register refers to the number of times a comparison picture is compared with a reference picture. If the specified address value of the A register is not M in step 2154, the A and B register values are increased by "1" (216) and the process is repeated in step 212. On the other hand, if the pixel sampling data is abnormally different, the number of recognized pixels is P, and if V is the same as K, i.e., the number of times the pixel sampling data is different (A register), step 217 is performed. When A register is compared with P (218) (A register) is larger than P, the process shifts to " 1 " added to the designated address value of the PICTURE register and stored again in the PICTURE register (219).

The PICTURE register indicates a number of times to compare a comparison picture with a reference picture.

On the other hand, if the number of times to compare the comparison image to the reference image is Q, it is checked whether the designated register value of the designated register of the counter register is equal to Q (220). If the designated register value of the counter is different from Q, the sampling start signal is examined. In step 221, if the designated register value of the counter is equal to Q, the process proceeds to step 222 of comparing the value of the PlCTURE register and the value of L. Where L is the number of images of Q torch that are judged to be different images if the number of times of L is different. If the value of the A register is smaller than the P value in step 218, the process immediately proceeds to step 220. In step 221, if the sampling start signal is present, step 206 is repeated. If there is no sampling start signal, step 221 is repeated.

If the designated register value of the PICTURE register is greater than the value L in step 222, the process proceeds to step 224 of recording and alarming and repeats from the first 200 steps.

If the designated register value of the PICTRUE register is smaller than the value of L in step 222, the recording and alarm mode are released (223).

As described above, the present invention records only moving parts of a subject when recording with a VCR, thereby saving tapes, and can be applied to a camcorder to serve as an anti-theft device, and to observe the movement of a machine for a long time. .

Claims (6)

A first process of sampling reference m information per line according to the leading horizontal synchronization signal of each line while sampling m lines according to the leading vertical synchronization signal of a field among the supplied video signals, and storing reference field information; A second process of sampling the m lines according to the tanning vertical synchronization signal of the field located at an integer multiple from the field, and storing the comparison field information by sampling n pixels per line according to the front horizontal synchronization signal of each line; And compare pixel information per line in each of the two processes with each other to check whether different pixel information among the pixel information has a preset reference constant k (where 0 <k <n) or more, and k pixel information among m lines The third step of counting the number of different lines and the count value of the third step are checked whether or not the preset reference constant P (where 0 &lt; P &lt; m) is equal to or greater than the reference field of the m lines. A fourth step of counting the number of comparisons in which the number of different lines is greater than or equal to p, and counting the number of comparisons between the reference field information and the comparison field information in the fourth step, and checking whether the preset / time field comparison is completed. If not, the fifth step of reproducing to the second step and the count value of the fourth step when the comparison of the field information in the fifth step / time is completed is greater than or equal to the preset reference information q (0 <g <∫). If it is less than q by checking the authorization, the sixth process of initializing the count value of the third or fourth process and returning to the second process, and if the q is greater than q in the sixth process, is supplied in the first process. And a seventh process of detecting that the video signal is a video signal for a moving subject. The method according to claim 1, wherein the reference field information and the comparison field information are obtained by sampling a luminance signal of a video signal. The moving picture detection method according to claim 2, wherein the reference field information and the comparison field information are obtained by sampling the even field in the interlaced scanning method. A low pass filter means for separating only the luminance signal from the supplied composite video signal, a synchronous separator for separating and outputting vertical and horizontal synchronous signals from the composite video signal having the same property as the signal input to the low pass filter means, and the vertical And a field superiority / oddity detector for detecting an even field by receiving a horizontal synchronization signal, and a vertical sampling signal generating means for generating a vertical sampling signal for sampling a horizontal line in a vertical video signal section by receiving the resin and the horizontal synchronization signal. And a horizontal sampling signal for generating a horizontal sampling signal for sampling the pixel information in the horizontal line sampled in the vertical video signal section of the vertical sampling signal generating means when detecting the even field of the field excellent / odd detector. Sampling start of the generated signal and the vertical synchronous signal at the leading end of the even field of the field excellent / odd detector A sampling start signal supply means for supplying a call, an analog / digital converter for digitally converting and outputting a luminance signal in the composite video room by the horizontal sampling signal, and the vertical sampling signal when the sampling start signal is applied. Receives pixel information of a line from the analog-to-digital converter, stores even field information, performs first stored first rain field information, compares the next very few field information with the reference information, and compares the predetermined number of times. And a microcomputer that detects whether or not the video signal supplied is a video signal for a moving subject as a ratio of dissimilar judgment counts to a certain number of comparison results as a result of the comparison. 5. The apparatus as claimed in claim 4, wherein the vertical sampling signal generating means comprises: a first stage stable multi-vibrator for generating a first pulse signal having a pulse width from the front end of the vertical synchronization signal to the front end of the vertical image signal; A second monostable multivibrator that is triggered at a rear end of the pulse signal to generate a second pulse signal having a pulse width of the vertical video signal section, and a pulse to the front end of the horizontal luminance signal triggered at the front end of the horizontal synchronization signal; A third single-stable multivibrator for generating a third pulse signal having a width, and a 45th single-stable for triggering a rear end of the third pulse signal to generate a fourth pulse signal having a pulse width of the horizontal luminance signal section; A multi-vibrator, the fourth pulse signal is counted and cleared by the second pulse signal, and is output from the N-bin counter and the N-bin counter. Copper (動) image detecting method, characterized in that the horizontal synchronization signal Sam spring configured as an AND logic gate means for outputting a vertical sampling signal. 6. The horizontal sampling generating means according to claim 5, wherein the horizontal sampling generating means includes an AND logic means for inputting the second and fourth pulse signals and an output signal of the even field detector, and a predetermined value at the time of "high" output of the AND logic means. A moving picture detection device comprising a RC oscillating means for generating a horizontal sampling signal of frequency.

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