CN102655601B - A kind of Sequential Color and Memory system formula detection method and device - Google Patents
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Abstract
The embodiment of the invention discloses a kind of Sequential Color and Memory system formula detection method, comprise the steps: that vision signal inputs line by line; In the burst signal region of every a line vision signal, arrange a window, be one group according to 6 often adjacent row vision signals; In window area, the data correspondence that in each group, odd-numbered line or even number line are gone between two is added, all obtain three and value, judge that whether satisfied the amplitude of three and value is two little one large, and the situation that meets of three and value is voted, judge whether have one to be greater than all the other two in three ballot value M1, M2, M3 and be all greater than the threshold value of a setting with all the other differences of two, if so, then current standard is Sequential Color and Memory system formula again.The invention also discloses a kind of corresponding SECAM system detection device.The method of the invention and device fairly simple, be convenient to realize.
Description
Technical Field
The invention relates to the field of video signal processing, in particular to a method and a device for detecting the format of a video signal.
Background
The traditional video signal is divided into three systems of NTSC, PAL and SECAM, each system is divided into a plurality of subclasses, the several systems need to be automatically identified in a full-system decoding chip, when the system is judged wrongly, the phenomena of wrong image color, unstable lines and fields and the like can occur, therefore, the accuracy of system detection is a prerequisite condition for obtaining a clear image by correctly decoding.
As shown in fig. 1, fig. 1 shows various characteristics of all current systems, wherein the SECAM system has two color subcarrier frequencies, and the PAL system and the NTSC system are single fixed color subcarrier frequencies, so the SECAM system is easily distinguished from the PAL system and the NTSC system, and after the SECAM system is distinguished, the PAL system and the NTSC system are distinguished, so how to distinguish the SECAM system is an important link in system judgment.
In the prior art, a method for distinguishing PAL system and SECAM system is provided, based on the principle that PAL system color synchronous head only lasts 2.4us and occupies about half of back shoulder level, while SECAM system color synchronous head lasts 4.6us and occupies almost the whole back shoulder level time, so that colorless synchronous head (or amplitude after chrominance demodulation) can be detected by using time window to distinguish the two systems. Other methods for distinguishing between the PAL system and the SECAM system are available in the prior art, for example, the burst adjacent rows of the SECAM system are 4.2M and 4.40625M, while the PAL system is fixed at 4.4M, so that if the voltage is used to represent the burst frequency, the burst of the SECAM system will exhibit a jitter of half the row frequency, while the output of the PAL system is a dc signal.
However, the SECAM system judgment method based on the above principle is complex to implement, and when the signal is weak, the accuracy of color burst signal judgment is affected or even disabled due to the existence of interference.
Disclosure of Invention
The embodiment of the invention provides a SECAM system detection method, which comprises the following steps:
inputting video signals line by line;
setting a window in the color burst region of each line of video signals, and setting six consecutive lines of data as L1, L2, L3, L4, L5 and L6 according to each adjacent 6 lines of video signals as a group;
in the window region, in each of the odd lines L1, L3, and L5 in the group, a sum value obtained by adding data corresponding to L1 and L3 is represented by S1, a sum value obtained by adding data corresponding to L1 and L5 is represented by S2, and a sum value obtained by adding data corresponding to L3 and L5 is represented by S3;
or in the window region, in each even line L2, L4, and L6 in the group, the sum obtained by adding the data corresponding to the line L2 and the line L4 is represented by S1, the sum obtained by adding the data corresponding to the line L2 and the line L6 is represented by S2, and the sum obtained by adding the data corresponding to the line L4 and the line L6 is represented by S3;
judging whether the amplitudes of the three sum values meet S1 & gt S2, and S1 & gt S3;
if the amplitudes of the three sum values satisfy S1 & gt S2 and S1 & gt S3, adding 1 to the voting value M1 corresponding to the sum value S1;
if the amplitudes of the three sum values do not satisfy S1 > S2 and S1 > S3, subtracting 1 from the voting value M1 corresponding to the sum value S1;
judging whether the amplitudes of the three sum values meet S2 & gt S1, and S2 & gt S3;
if the amplitudes of the three sum values satisfy S2 & gt S1 and S2 & gt S3, adding 1 to the voting value M2 corresponding to the sum value S2;
if the amplitudes of the three sum values do not satisfy S2 > S1 and S2 > S3, subtracting 1 from the voting value M2 corresponding to the sum value S2;
judging whether the amplitudes of the three sum values meet S3 & gt S2, and S3 & gt S1;
if the amplitudes of the three sum values satisfy S3 & gt S1 and S3 & gt S2, adding 1 to the voting value M3 corresponding to the sum value S3;
if the amplitudes of the three sum values do not satisfy S3 > S1 and S3 > S2, subtracting 1 from the voting value M3 corresponding to the sum value S3;
and judging whether one of the three voting values M1, M2 and M3 is larger than the rest two and the difference values between the voting value M1, M2 and M3 and the rest two are larger than a set threshold value, if so, the current system is the SECAM system.
The method is characterized in that a window is arranged in a color burst signal area of each line of video signals, and after 6 adjacent lines of video signals form a group, the method further comprises the following steps:
setting the number of groups participating in one-time accumulation as every adjacent continuous N groups of signals, wherein N is a natural number;
and accumulating corresponding lines of the N groups of signals in a window area to obtain an enhanced progressive video signal.
The step of judging whether the difference between one of the three voting values M1, M2 and M3 and the other two is greater than a set threshold, if so, before the current format is the SECAM format, further includes a step of: the three vote values M1, M2, M3 are clipped.
The invention also provides a SECAM system detection device, which comprises:
a signal input unit: for inputting a video signal line by line;
a window setting unit: a window for setting a color burst area for each line of video signals, and for setting six consecutive lines of data, each of which is represented by L1, L2, L3, L4, L5, L6, for each adjacent 6 lines of video signals as a group;
two-by-two superposition unit: in the window region, in each of the odd lines L1, L3, and L5 in the group, a sum value obtained by adding data corresponding to L1 and L3 is represented by S1, a sum value obtained by adding data corresponding to L1 and L5 is represented by S2, and a sum value obtained by adding data corresponding to L3 and L5 is represented by S3;
or in the window region, in each even line L2, L4, and L6 in the group, the sum obtained by adding the data corresponding to the line L2 and the line L4 is represented by S1, the sum obtained by adding the data corresponding to the line L2 and the line L6 is represented by S2, and the sum obtained by adding the data corresponding to the line L4 and the line L6 is represented by S3;
a sum-value-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S1 > S2, and S1 > S3;
and a sum value one voting unit: the voting value M1 corresponding to the sum value S1 is added with 1 if the amplitudes of the three sum values satisfy S1 & gtS 2 and S1 & gtS 3, and otherwise, the voting value is subtracted with 1;
a sum two-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S2 > S1, and S2 > S3;
and a sum-two voting unit: when the amplitudes of the three sum values satisfy S2 > S1 and S2 > S3, adding 1 to the voting value M2 corresponding to the sum value S2, and otherwise, subtracting 1;
and a sum value three-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S3 > S2, and S3 > S1;
and a sum value three voting unit: the voting value M3 corresponding to the sum value S3 is added with 1 if the amplitudes of the three sum values satisfy S3 & gtS 1 and S3 & gtS 2, and otherwise, the voting value is subtracted with 1;
a system determination unit: and the method is used for judging whether one of the three voting values M1, M2 and M3 is larger than a set threshold value or not, and if so, the current system is the SECAM system.
The window setting unit also comprises the following steps:
a parameter setting unit: the device is used for setting the number of groups participating in one accumulation as every adjacent continuous N groups of signals; the N is a natural number;
an accumulation enhancement unit: and accumulating corresponding lines of the N groups of signals in a window area to obtain an enhanced progressive video signal.
Drawings
And a voting value amplitude limiting unit is added in front of the system determining unit and is used for carrying out amplitude limiting on three voting values M1, M2 and M3.
In the embodiment of the invention, the detection of the SECAM system is carried out by adopting a simple method according to the amplitude and frequency characteristics of the color subcarrier of the SECAM system. Particularly, the specific implementation mode of the invention is also based on the color subcarrier rule of the SECAM system, and the signal intensity of the color subcarrier is effectively enhanced by adopting an accumulation method, so that the accuracy of the SECAM system detection is ensured, and the SECAM system detection cannot fail due to the existence of interference.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a table of characteristics of all systems in the prior art;
FIG. 2 is a table showing chrominance information and corresponding color subcarrier phase information of rows of odd and even fields of the SECAM system according to the prior art;
FIG. 3 is a table showing the results of a group of same color burst signals superimposed on each other in accordance with an embodiment of the present invention;
fig. 4 is a flowchart of a detection method of the SECAM system according to an embodiment of the present invention;
fig. 5 is a flowchart of the SECAM system detection method shown in fig. 4 under weak signal conditions according to an embodiment of the present invention;
Detailed Description
Fig. 6 is a block diagram of a SECAM format detection apparatus according to an embodiment of the present invention;
fig. 7 is a block diagram of a SECAM detection apparatus under weak signal conditions according to an embodiment of the present invention.
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, the technical background related to the present invention will be briefly described.
Color burst area: the CVBS signal is composed of an image signal, a composite blanking signal, and a composite synchronization signal. The color synchronous signal is on the back shoulder of the line blanking pulse after the line synchronous signal, and is a section (9 +/-1 color subcarrier period) of constant amplitude wave which has the same frequency as the color subcarrier of the sending end and keeps a definite phase relation with the color subcarrier. The color burst region is the region of 9 ± 1 color subcarrier periods.
SECAM transmission rule: fig. 2 shows a table of chrominance information and corresponding color subcarrier phase information of rows of odd and even fields of the SECAM system in the prior art; the burst head of the SECAM system has the following regularity: the chrominance signals Db and Dr appear alternately, and cycle once every 6 lines, and one group of 6 lines is formed, the polarities of Db and Dr lines in the group are both in-phase in 2 lines and in reverse phase in 1 line; the relative polarity relationship between Db and Dr rows in each 6 rows is kept constant, and the following is a SECAM system determination based on this rule.
Fig. 4 shows a SECAM format detection method according to an embodiment of the present invention, which includes the following steps:
step S100: inputting video signals line by line;
step S101: setting a window in the color synchronizing signal area of each line of video signals, and grouping the adjacent 6 lines of video signals; the window area does not exceed the color burst area of each line of video signals, so that the calculation of system judgment does not involve image data.
Step S102: in the window area, the data of two rows in the odd rows in each group are correspondingly added to obtain three sum values, and the set sum value is represented by S1, the sum value is represented by S2, and the sum value is represented by S3; the odd rows in each group are three rows, namely the 1 st, 3 rd and 5 th rows of the 6 th row of data in the group are L1, L3 and L5, the data of the two rows are correspondingly added, namely the corresponding data of the L1 row and the L3 row are respectively added in a set window area, and the obtained sum value is represented by S1; correspondingly, the line L1 and the line L5 are in the set window area, the corresponding data are respectively added, and the obtained sum value is represented by S2; lines L3 and L5 are in the window area, the corresponding data are added, and the sum is represented by S3. The corresponding data refers to data of the same ordinate when the row is abscissa and the column is ordinate. For example, the first data of line L1 and the first data of line L3, the 2 nd data of line L1 and the 2 nd data of line L3 are the corresponding data of line L1 and line L3.
Fig. 3 shows the polarity relationship of the burst heads of the same color row in a group (6 rows) of the SECAM system, wherein the results of the two-by-two overlapping of the data corresponding to the odd rows are two "0" and one "2", i.e. only two rows in the three rows have the same polarity, and the results after two-by-two overlapping inevitably appear two smaller and one larger. Also, the even rows within each group have the same characteristics as described above.
Therefore, it should be noted that in the window region, the data of two rows in the even rows in each group may be correspondingly added, and the adding method is the same as the method for correspondingly adding the data of two rows in the odd rows, and the technical effects of the present invention can also be achieved.
Step S103: judging whether the amplitudes of the three sum values satisfy S1 & gt S2 and S1 & gt S3, namely judging whether the three sum values satisfy two-small-one-large and large sum values S1;
step S104: if the amplitudes of the three sum values satisfy S1 & gt S2 and S1 & gt S3, adding 1 to the voting value M1 corresponding to the sum value S1;
step S105: if the amplitudes of the three sum values do not satisfy S1 > S2 and S1 > S3, subtracting 1 from the voting value M1 corresponding to the sum value S1;
step S106: judging whether the amplitudes of the three sum values satisfy S2 & gt S1 and S2 & gt S3, namely judging whether the three sum values satisfy two-small-one-large and large sum values S2;
step S107: if the amplitudes of the three sum values satisfy S2 & gt S1 and S2 & gt S3, adding 1 to the voting value M2 corresponding to the sum value S2;
step S108: if the amplitudes of the three sum values do not satisfy S2 > S1 and S2 > S3, subtracting 1 from the voting value M2 corresponding to the sum value S2;
step S109: judging whether the amplitudes of the three sum values satisfy S3 & gt S2 and S3 & gt S1, namely judging whether the three sum values satisfy two-small-one-large and large sum values S3;
step S110: if the amplitudes of the three sum values satisfy S3 & gt S1 and S3 & gt S2, adding 1 to the voting value M3 corresponding to the sum value S3;
step S111: if the amplitudes of the three sum values do not satisfy S3 > S1 and S3 > S2, subtracting 1 from the voting value M3 corresponding to the sum value S3;
step S112: and judging that one of the three voting values M1, M2 and M3 is greater than the rest two, and the difference values between the voting value M1, M2 and M3 and the rest two are greater than a set threshold value, if so, the current system is the SECAM system.
The initial values of the three vote values M1, M2, M3 are zero.
The SECAM system detection method described in fig. 4 can detect whether the signal is the SECAM system or not only by superposition and amplitude determination, and is relatively easy to implement, and has a simple structure and saves cost and space, and when the video signal strength is normal, the detection effect is better, and when the signal strength is weaker, the burst signal amplitude is smaller and is easily affected by noise, so that, as shown in the flowchart of the SECAM system detection method in the case of weak signals shown in fig. 5, the difference from the detection method shown in fig. 4 is that step S114 and step S115 are added in the case of weak signals, specifically as follows:
step S114: setting the number of groups participating in one accumulation as every adjacent continuous N groups of signals; n is a natural number, and a user can set the number according to the size of the storage space, and this embodiment will be described with N being 2 as an example.
Step S115: accumulating corresponding rows of the N groups of signals in a window area to obtain enhanced progressive video signals; in this embodiment, if N is 2, the adding of the corresponding rows of the N groups of signals means: in analogy, the 1 st line of the first group and the 1 st line of the second group, the 2 nd line of the first group and the 2 nd line of the second group are accumulated, respectively, and the 6 th line of the first group and the 6 th line of the second group are accumulated by a specific accumulation method, namely, corresponding data of corresponding lines are added, for example, the 1 st data in a window area of the 1 st line of the first group and the 1 st data in a window area of the 1 st line of the second group are added; adding the 2 nd data in the window region of line 1 of the first group to the 2 nd data in the window region of line 1 of the second group; and so on.
After steps S114 and S115, the signals are accumulated and enhanced, and the accumulation is based on the law of the SECAM system, so that the video signals are not affected, and the signals of the color subcarriers can be effectively enhanced, so that the system detection is more accurate.
In addition, step S113 may be added before step S112, specifically as follows:
step S113: clipping the three voting values M1, M2 and M3; when the voting value continuously increases and reaches a certain threshold value, the voting value is kept unchanged; when the vote value decreases to a certain threshold, it also remains unchanged. Thereby preventing errors in the vote value due to overflow. Wherein, the certain threshold to which to decrease may be 0.
The present invention further provides a SECAM format detecting apparatus based on the SECAM format detecting method as shown in fig. 4, where the apparatus includes: a signal input unit 100, a window setting unit 101, a pairwise superimposing unit 102, a sum value-one amplitude judgment unit 103, a sum value-one voting unit 104, a sum value-two amplitude judgment unit 105, a sum value-two voting unit 106, a sum value-three amplitude judgment unit 107, a sum value-three voting unit 108, and a format determination unit 109; wherein,
signal input unit 100: for inputting a video signal line by line;
window setting unit 101: the color synchronization signal area is used for setting a window in the color synchronization signal area of each line of video signals, and each group of 6 adjacent lines of video signals are taken as a group;
two-by-two superimposing unit 102: in the window area, the data of two rows in the odd rows in each group are correspondingly added to obtain three sum values, and the set sum value is represented by S1, the sum value is represented by S2, and the sum value is represented by S3;
of course, the two-by-two overlapping unit 102 may also be replaced by an even-numbered row two-by-two overlapping unit, and the difference between the even-numbered row two-by-two overlapping unit and the two-by-two overlapping unit 102 is only that "the odd-numbered row in each group" is replaced by "the even-numbered row in each group", wherein the calculation manner when the even-numbered row is the same as the calculation manner when the odd-numbered row is the same.
Sum value-amplitude determination unit 103: for judging whether the amplitudes of the three sum values satisfy S1 > S2, and S1 > S3;
sum-value one voting unit 104: the voting value M1 corresponding to the sum value S1 is added with 1 if the amplitudes of the three sum values satisfy S1 & gtS 2 and S1 & gtS 3, and otherwise, the voting value is subtracted with 1;
sum two amplitude determination unit 105: for judging whether the amplitudes of the three sum values satisfy S2 > S1, and S2 > S3;
sum-value two voting unit 106: when the amplitudes of the three sum values satisfy S2 > S1 and S2 > S3, adding 1 to the voting value M2 corresponding to the sum value S2, and otherwise, subtracting 1;
sum three-amplitude determination unit 107: for judging whether the amplitudes of the three sum values satisfy S3 > S2, and S3 > S1;
sum value three voting unit 108: the voting value M3 corresponding to the sum value S3 is added with 1 if the amplitudes of the three sum values satisfy S3 & gtS 1 and S3 & gtS 2, and otherwise, the voting value is subtracted with 1;
system determination unit 109: and the method is used for judging that one of the three voting values M1, M2 and M3 is greater than the other two and the difference values between the two values are greater than a set threshold value, if so, the current system is the SECAM system.
The present invention further provides a SECAM system detection apparatus based on the SECAM system detection method under weak signal as described in fig. 5, which is different from the apparatus as shown in fig. 6 in that the apparatus further includes a parameter setting unit 111 and an accumulation enhancing unit 112 after the window setting unit 101, wherein:
the parameter setting unit 111: the device is used for setting the number of groups participating in one accumulation as every adjacent continuous N groups of signals; and N is a natural number.
The accumulation enhancement unit 112: and accumulating corresponding lines of the N groups of signals in a window area to obtain an enhanced progressive video signal.
The two units can effectively enhance the color synchronous signal part of the video signal, and cannot cause distortion to the video signal, so that the SECAM system can still be accurately detected under the condition of weak signals, and preparation is made for decoding or subsequent playing and the like.
In addition, in the detection apparatus under the normal signal and the weak signal as shown in fig. 6 and fig. 7, a vote value clipping unit 110 may be added before the format determination unit 109 for clipping three vote values M1, M2, M3; when the voting value continuously increases and reaches a certain threshold value, the voting value is kept unchanged; when the vote value decreases to a certain threshold, it also remains unchanged. Thereby preventing errors in the vote value due to overflow. Wherein, the certain threshold to which to decrease may be 0.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
The above detailed description of the embodiments of the present invention, and the detailed description of the embodiments of the present invention used herein, is merely intended to facilitate the understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A SECAM system detection method is characterized by comprising the following steps:
inputting video signals line by line;
setting a window in the color burst region of each line of video signals, and setting six consecutive lines of data as L1, L2, L3, L4, L5 and L6 according to each adjacent 6 lines of video signals as a group;
in the window region, in each of the odd lines L1, L3, and L5 in the group, a sum value obtained by adding data corresponding to L1 and L3 is represented by S1, a sum value obtained by adding data corresponding to L1 and L5 is represented by S2, and a sum value obtained by adding data corresponding to L3 and L5 is represented by S3;
or in the window region, in each even line L2, L4, and L6 in the group, the sum obtained by adding the data corresponding to the line L2 and the line L4 is represented by S1, the sum obtained by adding the data corresponding to the line L2 and the line L6 is represented by S2, and the sum obtained by adding the data corresponding to the line L4 and the line L6 is represented by S3;
judging whether the amplitudes of the three sum values meet S1 & gt S2, and S1 & gt S3;
if the amplitudes of the three sum values satisfy S1 & gt S2 and S1 & gt S3, adding 1 to the voting value M1 corresponding to the sum value S1;
if the amplitudes of the three sum values do not satisfy S1 > S2 and S1 > S3, subtracting 1 from the voting value M1 corresponding to the sum value S1;
judging whether the amplitudes of the three sum values meet S2 & gt S1, and S2 & gt S3;
if the amplitudes of the three sum values satisfy S2 & gt S1 and S2 & gt S3, adding 1 to the voting value M2 corresponding to the sum value S2;
if the amplitudes of the three sum values do not satisfy S2 > S1 and S2 > S3, subtracting 1 from the voting value M2 corresponding to the sum value S2;
judging whether the amplitudes of the three sum values meet S3 & gt S2, and S3 & gt S1;
if the amplitudes of the three sum values satisfy S3 & gt S1 and S3 & gt S2, adding 1 to the voting value M3 corresponding to the sum value S3;
if the amplitudes of the three sum values do not satisfy S3 > S1 and S3 > S2, subtracting 1 from the voting value M3 corresponding to the sum value S3;
and judging whether one of the three voting values M1, M2 and M3 is larger than the rest two and the difference values between the voting value M1, M2 and M3 and the rest two are larger than a set threshold value, if so, the current system is the SECAM system.
2. The method of claim 1, wherein a window is provided in the burst area of each line of video signals, and after grouping the adjacent 6 lines of video signals, the method further comprises the steps of:
setting the number of groups participating in one-time accumulation as every adjacent continuous N groups of signals, wherein N is a natural number;
and accumulating corresponding lines of the N groups of signals in a window area to obtain an enhanced progressive video signal.
3. The method according to claim 1 or 2, wherein the determining that the difference between one of the three votes M1, M2, M3 and the other two votes is greater than a predetermined threshold value, and if yes, the method further comprises a step of: the three vote values M1, M2, M3 are clipped.
4. An SECAM system detection apparatus, comprising:
a signal input unit: for inputting a video signal line by line;
a window setting unit: a window for setting a color burst area for each line of video signals, and for setting six consecutive lines of data, each of which is represented by L1, L2, L3, L4, L5, L6, for each adjacent 6 lines of video signals as a group;
two-by-two superposition unit: in the window region, in each of the odd lines L1, L3, and L5 in the group, a sum value obtained by adding data corresponding to L1 and L3 is represented by S1, a sum value obtained by adding data corresponding to L1 and L5 is represented by S2, and a sum value obtained by adding data corresponding to L3 and L5 is represented by S3;
or in the window region, in each even line L2, L4, and L6 in the group, the sum obtained by adding the data corresponding to the line L2 and the line L4 is represented by S1, the sum obtained by adding the data corresponding to the line L2 and the line L6 is represented by S2, and the sum obtained by adding the data corresponding to the line L4 and the line L6 is represented by S3;
a sum-value-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S1 > S2, and S1 > S3;
and a sum value one voting unit: the voting value M1 corresponding to the sum value S1 is added with 1 if the amplitudes of the three sum values satisfy S1 & gtS 2 and S1 & gtS 3, and otherwise, the voting value is subtracted with 1;
a sum two-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S2 > S1, and S2 > S3;
and a sum-two voting unit: when the amplitudes of the three sum values satisfy S2 > S1 and S2 > S3, adding 1 to the voting value M2 corresponding to the sum value S2, and otherwise, subtracting 1;
and a sum value three-amplitude judgment unit: for judging whether the amplitudes of the three sum values satisfy S3 > S2, and S3 > S1;
and a sum value three voting unit: the voting value M3 corresponding to the sum value S3 is added with 1 if the amplitudes of the three sum values satisfy S3 & gtS 1 and S3 & gtS 2, and otherwise, the voting value is subtracted with 1;
a system determination unit: and the method is used for judging whether one of the three voting values M1, M2 and M3 is larger than a set threshold value or not, and if so, the current system is the SECAM system.
5. The apparatus of claim 4, wherein the window setting unit is followed by further comprising:
a parameter setting unit: the device is used for setting the number of groups participating in one accumulation as every adjacent continuous N groups of signals; the N is a natural number;
an accumulation enhancement unit: and accumulating corresponding lines of the N groups of signals in a window area to obtain an enhanced progressive video signal.
6. The apparatus according to claim 4 or 5, wherein a vote value clipping unit is added before the format determining unit, for clipping three vote values M1, M2, M3.
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| CN1777257A (en) * | 2005-11-29 | 2006-05-24 | 天津三星电子显示器有限公司 | Method for automatically identifying received signal standard for analogue television signal receiver |
| CN101057507A (en) * | 2004-12-30 | 2007-10-17 | 科尼桑特系统股份有限公司 | Automatic video detector |
| CN101094421A (en) * | 2007-07-30 | 2007-12-26 | 北京中星微电子有限公司 | Method and device for detecting types of subcarrier of SECAM video signal |
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| CN101057507A (en) * | 2004-12-30 | 2007-10-17 | 科尼桑特系统股份有限公司 | Automatic video detector |
| CN1777257A (en) * | 2005-11-29 | 2006-05-24 | 天津三星电子显示器有限公司 | Method for automatically identifying received signal standard for analogue television signal receiver |
| CN101094421A (en) * | 2007-07-30 | 2007-12-26 | 北京中星微电子有限公司 | Method and device for detecting types of subcarrier of SECAM video signal |
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Address after: 4, building 406, room 518057, two software park, hi tech Zone, Nanshan District, Guangdong, Shenzhen Patentee after: Shenzhen Shenyang electronic Limited by Share Ltd Address before: 4, building 406, room 518057, two software park, hi tech Zone, Nanshan District, Guangdong, Shenzhen Patentee before: Aike Chuangxin Microelectronic Co., Ltd. |