CN1770878A

CN1770878A - Sub-carrier detection (SCD) for motion threshold logic

Info

Publication number: CN1770878A
Application number: CN 200510128353
Authority: CN
Inventors: R·A·巴彻
Original assignee: Genesis Microchip Inc
Current assignee: Genesis Microchip Inc
Priority date: 2004-10-15
Filing date: 2005-10-14
Publication date: 2006-05-10

Abstract

An apparatus comprising a video decoder configured to receive a composite video signal modulated on a sub-carrier signal and having a luma component and a chroma component, the video decoder configured to perform a motion detection operation on the luma component and the chroma component in a plurality of frequency regions respectively. The video decoder includes variable threshold logic, coupled to the video decoder, and configured to provide a unique threshold value to the video decoder for each of the plurality of frequency regions respectively. The apparatus also includes a sub-carrier detection logic, coupled to the variable threshold logic, and configured to detect the sub-carrier signal by checking both spatial and temporal characteristics of the sub-carrier detection logic.

Description

The subcarrier that is used for the movement threshold logical circuit detects (SCD)

Technical field

The present invention relates to Video processing, and especially, relate to a kind of equipment and method of adaptive threshold logical circuit of motion detection of be used to decode NTSC and PAL vision signal.

Background technology

Be used for the National Television System Committee of television transmission (NTSC) standard, to be luminance signal and carrier chrominance signal transmit allowing RGB (RGB) conversion of signals that will come from television camera effectively.Luminance signal typically is labeled as " Y ", describes brightness and maximum detail by the image of television camera record.Carrier chrominance signal is the combination of two color difference signal R-Y (the red Y of subtracting) and B-Y (indigo plant subtracts Y), and the both is limited in the bandwidth of about 1MHz.Color difference signal separately is used to modulate the phase place and the amplitude of the subcarrier signal of a 3.58MHz.Phase modulated is represented tone, or the particular color of expectation, and Modulation and Amplitude Modulation is represented the intensity or the saturation of color difference signal.Thereby select the frequency of subcarrier to produce a signal so that carrier chrominance signal can interweave with frequency luminance signal, synthetic signal does not have any energy interference between colourity and luminance signal.

When television set receives the NTSC composite signal, in decoder, composite signal is decoded with separating luminance and carrier chrominance signal.Be the R-Y and the B-Y component signal that can be used to be based upon the rgb signal that shows on the video screen with chrominance demodulation subsequently.Because colourity and luminance signal are shared in the frequency bandwidth of about 3.58MHz, and luminance and chrominance information do not have by pre-filtering before addition, can not fully isolate luminance and chrominance information in decoding processing.Therefore, because code distortion has appearred much separating in the interference between luminance and chrominance information.Thereby the method that a lot of designs have been arranged is implemented in the better separation of the luminance and chrominance information during the decoding and minimizes and separate code distortion.

The method that two kinds of separating luminances and carrier chrominance signal are arranged generally.The filter that all comprises part being designed to distinguish composite signal and other parts.First method has been used " trap/band pass filter ", and second method has been used one " comb filter ".A lot of dissimilar comb filter are arranged, and they all have certain merits and demerits.

Sunken band filter is designed to by except with 3.5MHz being all frequencies of the composite signal the frequency of carrier chrominance signal at center.As a result, carrier chrominance signal has been eliminated, but has equally also eliminated a luminance signal part accordingly, has caused losing of high-frequency brightness information.The band pass filter that falls into band filter and only frequency by narrow chroma strip and output carrier chrominance signal and the HFS of the luminance signal use that walks abreast.In a word, trap/band pass filter method has an advantage is exactly seldom a kind of or does not lose the simple of vertical resolution (just, low frequency), the approach of low consumption.Shortcoming is to have lost brightness resolution, and when high frequency luminance is taken as colourity and handles (it is known as " color bar signal pattern " false picture) and when colourity is taken as brightness processed (it is known as dot crawl), cause serious display distortion.

Utilize the comb filtering method, subcarrier phase is designed to putting upside down 180 degree (and therefore also between two consecutive frames, this is owing in a frame odd-numbered line is arranged) between two adjacent image lines.Comb filtering mainly contains two classes: row comb filtering and frame comb filtering.In these two kinds of methods, basic conception comprises stack and subtracts each other two same signals with chrominance phase of having put upside down 180 degree.When superposed signal, just eliminated carrier chrominance signal and output luminance signal, and when subtraction signal, exported carrier chrominance signal with regard to having removed luminance signal.

Delegation, two row or three provisional capitals can be used to comb filtering in the row.Single when capable when using, delayed time delegation and be added by time-delay and the pixel of not delaying time accordingly and subtract each other of incoming video signal to obtain corresponding luminance and chrominance information.When using two row, use a line delay, the weighting summation of two line delays and the pixel of not delaying time obtains luminance and chrominance information respectively with subtracting each other.When using triplex row, be expert at 1 and 2 and

row

2 and 3 between determine a correlation.Then have best relation two the row on carry out comb filtering.Triplex row self-adapting comb filtering method is taken as the 2D auto-adaptive comb filter usually.All row comb filterings can produce better result than trap/band pass filter method, but still demonstrate colour contamination when showing the single circumstances in which people get things ready for a trip, and vertical resolution is lost, and dot crawl.

Frame comb filtering is similar with the row pectination, but replaces comparing two adjacent lines in the frame, and two row that have same position in two consecutive frames are used to comb filtering, therefore comb filtering are expanded to time-domain.Yet the frame pectination can only be carried out the stationary part of image.If motion then needs to turn back to the 2D-comb filtering.The method of utilizing motion detection that comb filtering is changed into frame comb filtering from the row comb filtering is considered to the Motion Adaptive decoding, or the 3D adaptive decoding.The 3D adaptive decoding has kept the level of rest image and vertical resolution fully and has not had dot crawl and colour contamination.But, the motion artifacts as big region point wriggling and ghost image can appear.

In the 3D adaptive decoding, comb filtering switches in based on the 3D of pixel one by one and 2D comb filtering method.If motion do not occur, then use the 3D comb filtering, and if the 2D comb filtering is then used in motion.Therefore, just need by accurately detecting in two interframe whether have " real motion ", whether perhaps last motion is to come the minimum movement distortion owing to " spurious motion " for example shaken or noise causes.

Summary of the invention

A kind of have one be configured to receive one modulated and have the equipment of Video Decoder of the composite video signal of luminance component and chromatic component on subcarrier signal, this Video Decoder is configured to luminance component in a plurality of frequency ranges and chromatic component are carried out the motion detection operation respectively.This Video Decoder comprises variable threshold logic circuit (VTL), and it is coupled to Video Decoder, and is configured to provide a unique threshold value to be respectively applied for each of a plurality of frequency ranges to Video Decoder.This equipment comprises that also a subcarrier detects logical circuit, and it is coupled to variable threshold logic circuit (VTL), and is configured to detect subcarrier signal by the room and time characteristic of checking subcarrier detection logical circuit.

Description of drawings

Accompanying drawing 1 shows total flow chart of the processing of carrying out by decoder according to the present invention.

Accompanying drawing 2 shows the schematic block diagram according to decoder of the present invention.

Accompanying drawing 3 shows total flow chart of the motion detection operation of accompanying drawing 1.

Accompanying drawing 4A shows the schematic block diagram of the circuit that is used to detect low frequency movement.

Accompanying drawing 4B shows low frequency movement and detects the flow chart of handling.

Accompanying drawing 5A shows the schematic block diagram of the logical circuit of the high frequency motion that is used to detect colourity and/or brightness.

Accompanying drawing 5B shows the flow chart of the motion detection processing that is used for high frequency colourity and/or brightness.

Accompanying drawing 6A shows the schematic block diagram of the logical circuit of the high frequency motion that is used to detect colourity with less brightness campaign and/or brightness.

Accompanying drawing 6B shows the flow chart of the high frequency motion that is used to detect colourity with less brightness campaign and/or brightness.

Accompanying drawing 7 shows schematic block diagram how to determine the NTSC motion.

Accompanying drawing 8 shows the schematic block diagram of operation of the blender (110) of decoder in more detail.

Accompanying drawing 9 shows the schematic block diagram of the adaptive threshold logical circuit (120) of decoder.

Accompanying drawing 10 is block diagrams that are used for the time detecting module of colorimetric properties detection time.

Accompanying drawing 11 is block diagrams of detection module between an exemplary space.

Accompanying drawing 12 is the block diagrams that are used to check the detection module of the space colorimetric properties that illustrated.

Accompanying drawing 13 is another detection modules that are used to detect circumstances in which people get things ready for a trip degree characteristic.

Accompanying drawing 14 is the logic modules that produce the motion control threshold signal.

Accompanying drawing 15 is schematic block diagram that show the variable threshold logic module (710) that shows adaptive threshold logic module (120) in more detail.

Accompanying drawing 16 shows the example of one 5 tap adaptive threshold window.

Accompanying drawing 17 shows the schematic block diagram of the logical circuit of the colourity amplitude on the next review time of using in the decoder.

Accompanying drawing 18 is one and shows the schematic block diagram that makes the logical circuit that is used for carrying out space inspection 4fsc sampling in decoder.

Accompanying drawing 19 is more detailed views of the colourity sampling comparison module of accompanying drawing 13.

Accompanying drawing 20 shows how to produce the final chrominance/luminance state value that variable threshold logic module (710) is used.

Accompanying drawing 21 is the schematic block diagram that are used to detect the PAL low frequency movement in decoder.

Accompanying drawing 22 is the schematic block diagram that are used to detect the motion of PAL colourity in decoder.

Accompanying drawing 23 is according to the first embodiment of the present invention, is used to detect the schematic block diagram of PAL brightness campaign in decoder.

Accompanying drawing 24 is according to a second embodiment of the present invention, is used to detect the schematic block diagram of PAL brightness campaign in decoder.

Accompanying drawing 25 is the schematic block diagram that are used for detecting at decoder the logical circuit of PAL motion.

Accompanying drawing 26 is the schematic block diagram that are used for producing at decoder the logical circuit of 3D carrier chrominance signal.

Accompanying drawing 27 is the schematic block diagram that are used for carrying out the logical circuit that the final motion of the NTSC/PAL system of combination determines.

Accompanying drawing 28 is the schematic block diagram that are used for eliminating the mask logic circuit of the spurious motion that is produced for the colored stagnant zone of PAL signal medium-high frequency.

Identical Reference numeral is represented components identical in each width of cloth accompanying drawing.

Embodiment

General introduction

The present invention relates to a kind of be used to detect for example synthetic NTSC that receives by television set, the method and apparatus of the motion in the vision signal of PAL signal or component video signal.At first, provide a general introduction that realizes the decoder of novel motion detection scheme, be illustrated in the motion detection of various frequency ranges subsequently.How describe the blender of how adjusting independent threshold value and describing in the decoder subsequently uses the motion of detection to determine whether to export 2D or 3D decoded signal.Discussion herein will preferentially concentrate on the NTSC signal, but be equally applicable to the PAL signal, or component video signal, and the mode with some less changes is positioned at the decline of description.

Accompanying drawing 1 shows total flow chart of the processing of being carried out by the 3D decoder of the method for testing motion of a realization novelty (1000).As shown in Figure 1, in decoder, receive the composite video signal (step 1002) that comprises colourity and luminance component.Subsequently the composite video signal of input is carried out motion detection operation (step 1004).Will go through as following, all carry out the motion detection operation for colourity and luminance signal in the different frequency scope.Therefore each scope has a unique adjustable threshold value and allows " real motion " better detection with respect to " spurious motion ", has produced one and has compared the decoded picture with the false picture of less physical activities with traditional 3D decoder.Whether this processing subsequent inspection has detected motion (step 1006) in the motion detection operation.If detected motion, operation advances to uses the decode step 1008 of composite signal of 2D logical circuit.But,, handle and just to continue to use the 3D logical circuit step 1010 of composite signal of decoding if in step 1006, do not detect motion.

Accompanying drawing 2 shows the schematic block diagram of the decoder (100) of the NTSC composite signal that the television set that is used to decode receives.3D decoder (100) receives composite video signal (102).Composite video signal (102) is at first and second line delays (104; 106) delay time respectively one and two the row.Current line signal (L1) that is accompanied by delegation's time delayed signal (L2) and one two line delay signal (L3) be input to have vertical logical circuit, in the self adaptation 2D decoder (108) of horizontal logical circuit and single file logical circuit.Self adaptation 2D decoder (108) filters out carrier chrominance signal (2D C) from composite video signal, and the 2D C carrier chrominance signal that filters out is transferred to blender to be described in detail below (110).Delegation's time delayed signal (L2) is transferred to compensation equally and leaches the carrier chrominance signal time-delay in required processing time (112), to produce luminance signal (Y).Except self adaptation 2D decoder (108), decoder (100) also comprises and is used to produce a logical circuit that is transferred to the 3D carrier chrominance signal (3D C) of the Motion Adaptive of blender (110) equally.In detecting the colourity motion, use two frame memories (114,116),, and in motion detection block (118), can easily determine a harmless correlation because the colourity sampling is in the phase place (just, at frame F0 and F2) of crossing over two frames.

Accompanying drawing 3 shows total flow chart (step 1004) of the motion detection operation of being carried out by motion detection block (118) of accompanying drawing 1.As shown in Figure 3, motion detection is handled by receiving an incoming frame signal, one one frame time delayed signal and one two frame time delayed signal (step 3002) beginning.Select first pixel (step 3004) in the incoming frame signal.Motion detection block (118) receives the independent threshold value (step 3006) that is respectively applied for low-frequency brightness territory, high frequency colourity territory and high frequency chrominance/luminance territory from variable threshold logic module (120) subsequently.Because variable threshold logic module (120) provides the independent threshold value that is used for each pixel and each frequency domain, compares the remarkable motion detection of having improved with traditional motion detection technique.In one embodiment, threshold value is based on pixel adjacent image point tight with it value relatively.This processing determines that the largest motion of the motion in the different frequency territory is the final motion value (step 3008) of pixel.Whether this processing subsequent inspection all pixels in incoming frame are all processed (step 3010).If all pixels are all processed, this processing finishes.Otherwise, select the next pixel (step 3012) in the incoming frame, and it is all processed up to all pixels to handle repeating step 3006 to 3010.Each frame that receives is carried out this motion detection to be handled.

Return accompanying drawing 2 now, when having determined final motion value, final motion value is transferred to blender (110) from motion detection block (118) by one 3 tap median filter (122) and a time delay module (124).Intermediate value tap filter (122) leaches the largest motion value to eliminate any motion or the non-motor point of glittering in pixel stream.3D carrier chrominance signal (3D C) is the pixel that results from a present picture element and a corresponding former frame, just, and F2-F1, and cut apart by factor two (126) subsequently.Signal is being transferred to blender (110) before, a band pass filter (128) and a time-delay (130) are being applied to this signal.Arrive blender (110) before at signal, band pass filter has limited the bandwidth of 3D carrier chrominance signal.In one embodiment, the chroma strip bandpass filter is one and has parameter-1/4,0,1/2,0 ,-1/4, and centre tap is five tap filters of two pixels on current pixel of decoding and its both sides.In another embodiment, chroma strip bandpass filter (128) is a broadband-pass filter that has with the subcarrier frequency the about 3MHz passband that is the center.

Based on the motion that detects in motion detection block (118), blender (110) determines that output 2D carrier chrominance signal still is the 3D carrier chrominance signal.If motion, output 2D C signal, and if motion does not appear, then from blender (110), export 3D C signal.The signal flow that comes from blender is eliminated chrominance information to prevent wherein correct color because a variety of causes can not show to colour killer (132), for example because lack the monochrome input of burst signal, or the like.At last the colourity (C) of separating and brightness (Y) signal are outputed to television set and be presented at rgb signal on the video screen with generation.

Low frequency movement detects

Accompanying drawing 4A shows the schematic block diagram of a logical circuit among motion detection block (118) embodiment that is used for detecting low frequency movement.Accompanying drawing 4B shows the low frequency movement of realizing in the motion detection block at accompanying drawing 4A (118) and detects the respective flow chart of handling.Determine low frequency movement by from incoming frame, deducting (202) one frames time-delay sampling, just, F1-F0 (step 4002).As mentioned above, the subcarrier phase of adjacent two frames differs 180 degree in NTSC.Because carrier chrominance signal is to be modulated on the subcarrier, the result who deducts frame F2 and F0 is but that brightness has been eliminated has obtained colourity and motion.The signal that produces from subtraction F2-F1 (C) is low pass filtering the high fdrequency component (step 4004) that comprises colourity with elimination.Identical signal (C) is taken as the input to the logical circuit of the high frequency motion with low-light level campaign that is used to detect colourity and/or brightness too, subsequently will be with reference to the accompanying drawings 6 it be explained in more detail.

In one embodiment, low pass filter (204) comprises that three have coefficient 1/4,0, and 1/2,0,1/4 5 tap filters (2+2) and one have coefficient 1/4,1/2,1/4 3 tap low pass filters (1+1).The combination of the filter in low pass filter (204) helps to have reduced the noise in the motion path and eliminated the subcarrier part that is translated as motion mistakenly.Subsequently the signal that is low pass filtering is transferred to negative signal or value are converted to the rectifier (206) (step 4006) of positive signal or value, and be transferred to a voting logic module (208) then.The threshold value (step 4008) that voting logic module (208) is determined by variable threshold logic circuit (VTL) (120) from deducting the motion value of rectification of input.Consequential signal is limited (210), just, any negative value be reduced to zero keep simultaneously unaltered on the occasion of, obtaining low frequency movement value (step 4010), and the motion detection value (step 4012) that is low pass filtering of output.

In one embodiment, the 35 tap filter has a bypass selection.Can from following table 1, find the decay of the low pass filter blocks (204) that is used for the NTSC signal, and the decay of PAL signal is listed in the table 2.

Frequency	Decay
Frequency	Decay	2MHz	-25dB
3MHz	-80dB	2MHz	-25dB
3MHz	-80dB	4MHz	-100dB
4.5MHz	-60dB	4MHz	-100dB
4.5MHz	-60dB	5MHz	-40dB

The decay of table 1:NTSC signal

Frequency	Decay
Frequency	Decay	2MHz	-15dB
3MHz	-40dB	2MHz	-15dB
3MHz	-40dB	4MHz	-100dB

5MHz	-95dB
5MHz	-95dB	6MHz	-46dB

The decay of table 2:PAL signal

In one embodiment, be applied to frame time-delay and the time-delay of two frames respectively in order to make softer to the switching of 3D, identical low frequency movement detect, shown in the piece among the accompanying drawing 4A 212 to 220.In addition at this, the signal (D) that subtraction signal F1 obtains from signal F0 is taken as the input of the logical circuit of the high frequency motion that is used to detect the less brightness campaign of having of colourity and/or brightness and uses, shown in accompanying drawing 6A.The maximum of F2-F1 motion and F1-F0 motion is confirmed as final low-frequency brightness motion respectively.

The high frequency motion of colourity and/or brightness detects

Accompanying drawing 5A shows a use detects the logical circuit of high frequency colourity and/or brightness campaign in motion detection block (118) the schematic block diagram of embodiment.Accompanying drawing 5B shows the respective flow chart that is used for high frequency colourity and/or the processing of brightness motion detection.Shown in accompanying drawing 5A and 5B,, from an incoming frame, deduct (302) two frames time-delay sampling, just F2-F0 (step 5002) in order to detect high frequency motion.(304) consequential signals of rectification subsequently (step 5004) also are transferred to voting logic piece (306) with it.Voting logic piece (306) deducts second threshold value (step 5006) of being determined by variable threshold logic circuit (VTL) (120) from the motion value of input.Consequential signal is limited (308) (step 5008) and is had coefficient 1/4,1/2,1/4 3 tap low pass filter (1+1) low-pass filtering (step 5010).Because subcarrier F0 has identical phase place with F2, this detection scheme provides suitable colourity motion and high frequency luminance motion.Output result signal (step 5012) subsequently.

In one embodiment, signal F2 and F0 by can be by bandpass filtering before being subtracted each other, make the low-frequency brightness motion be filtered out and only have the chroma strip motion in step 5002.As a result, the consequential signal of output will only comprise the chroma strip motion in the step 5012.

Chrominance/luminance motion with less brightness campaign

Accompanying drawing 6A shows a use detects the logical circuit embodiment of high frequency colourity with less brightness campaign and/or brightness campaign in motion detection block (118) schematic block diagram.Accompanying drawing 6B is illustrated in the corresponding sports of realizing in the motion detection block (118) and detects the flow chart of handling.Shown in accompanying drawing 6A and 6B, this motion estimation and the top with reference to the accompanying drawings high frequency motion that 5A and 5B discussed estimation all fours.Logical circuit shown in the accompanying drawing 6A can be with two kinds of pattern operations.In first kind of pattern, logical circuit is operated to detect and is crossed over the colourity motion that two frames have less brightness campaign.In second kind of pattern, logical circuit is operated the colourity motion that detects a frame.

At first, handling (6000), to determine to be to use two frame colourity patterns still be a frame colourity pattern (step 6002).In one embodiment, this by check whether set a single frames colourity motion allow bit to determine.If there is not the motion of set single frames colourity to allow bit, then use two frame patterns and handle continuation step 6004, wherein rectification comes from two single frames differential signal C (F2-F1 just) and the D (F1-F0 just) of accompanying drawing 4A.Subtraction signal D (step 6006) and rectification consequential signal (step 6014) from signal C subsequently.The voting logic module deducts the 3rd threshold value (step 6016) of being determined by variable threshold logic circuit (VTL) (120) from the rectification motion value of input then.Consequential signal is limited (308) (step 6018) and has coefficient 1/4,1/2, and 1/4 3 tap low pass filters (1+1) are low pass filtering (step 6020).Output result signal (step 6022) and end process subsequently.

If the processing in step 6002 determine set the motion of single frames colourity allow bit, just, should use single frames colourity motion detection, handle (6000) and do not use signal C and D, instead use frame F2 and F1.Each frame among frame F2 and the F1 is by bandpass filtering (step 6008) and by rectification (step 6010).The differential signal (step 6014) that the rectification form (step 6012) of subtraction signal F1 from the rectification form of signal F2, and rectification subsequently subsequently draws.Differential signal in step 6014 by rectification after, handle to continue aforesaid step 6016 to 6022.

Final motion

Accompanying drawing 7 shows one and how to be based upon the schematic block diagram that final NTSC motion is determined in the definite motion of different frequency scope.Final move file is the largest motion of top definite various frequency fields.Shown in top accompanying drawing 2, subsequently by finally motion of one the 3 horizontal median filter of tap (122) transmission.The horizontal median filter of this 3 tap (122) is eliminated and is glittered motion and do not have motor point and/or row.Final NTSC motion is reduced to 5 bit widths.Largest motion value 16 will cause that decoder only exports the 2D luminance and chrominance information.The zero decoder that will cause of minimum movement value is only exported the 3D luminance and chrominance information.Any value between zero-sum 16 will cause signal that has mixed 2D and 3D signal of decoder output.In blender (110), mix, will be described in detail below.

Blender

Accompanying drawing 8 shows the operation schematic block diagram of a blender according to the decoder of the embodiment of the invention (110) in more detail.Reach as discussed above shown in the accompanying drawing 8,2D carrier chrominance signal (2D_C) comes from 2D chrominance/luminance separator, and 3D carrier chrominance signal (3D_C) comes from 3D chrominance/luminance separator.Also be taken as the input use of blender (110) from the 5 bits motion of motion detection block (118) output.The colourity of blender output is based on 2D_C and 3D_C signal, following mixing:

Colourity output=(2D_C* motion)/16+ (3D_C* (16-motion)/16

Brightness output is to deduct colourity output to obtain from the synthetic video (L2) of input.One can be passed through the effective or invalid colour killer of firmware, in the time can not showing correct color, for example when input synthetic video (L2) is a monochrome video signal, is used to eliminate color from the signal that is showing.In certain embodiments, a filter, for example the adaptive control filter can be applied to chrominance path and strengthen the colour contamination inhibition.Similarly, sef-adapting filter also can be applied to luminance path and weakens luminance distortion influence

The threshold logic cirtuic that is used for motion detection

As discussed above, a kind of effective means of the composite signal of decoding is the motion of carrying out based on the auto-adaptive time decoding that utilizes the 3D comb filter, thus when occurring when not moving, time of implementation comb filtering (3D), otherwise carry out space comb filtering (2D).The 2D decoding has colour contamination and the false picture of dot crawl, yet the 3D decoding does not have the vacation picture of these image freeze parts.Therefore, the motion detection logic circuit is used for accurately detecting motion and therefore realizes the better image quality.

In one embodiment, realize motion detection by pixel one by one for the difference of investigating present frame and former frame fundamentally.Detected difference, just, " original difference " needs processed to detect real motion.Typically, the motion detection logic circuit comprises that how many original motions control has will be based on the repressed threshold logic cirtuic of system noise.If this threshold value has increased, then real motion will be lost in some cases, and if threshold value reduced, system noise will produce wrong motion indication.Therefore, it is very desirable having an adaptive threshold logical circuit.In addition, for dynamic, just carry out more well more by the motion detection logic circuit for the adaptive threshold logical circuit.In order to understand the variety of issue that needs to consider the adaptive logic threshold circuit, can introduce various noise types substantially below.

The inaccurate main cause of motion detection is a random noise, sampling clock noise or shake, and the diagonal that camera flash causes changes noise, clamper noise or the like.Following discussion will concentrate on sampling clock noise or shake and diagonal and change noise.Except the noise of short arc at random in the vision signal, for 3D decoder motion detection logic circuit, more high amplitude and higher frequency noise are noises at the boundary, and it causes the spurious motion of crossing over frame, and therefore switch to 2D, although should use 3D in these zones of image.The reason that noise at the boundary produces is because a variety of causes such as clock noise at the boundary, PLL (phase-locked loop loop) unsteadiness, and PLL follows the tracks of, perhaps ADC (analog to digital converter) the sampling clock shake that causes of loop filtering setting.

Because sampling clock shake, has deviation in the signal amplitude of the sampling of all signal boundaries.These deviations cause the appearance of noise at the boundary, its directly and clock jitter and border amplitude or slope proportional, just, the difference of the pixel value of two pixels is positioned in the one side on border.In one embodiment, by first difference of definite present picture element and last pixel and second difference of definite present picture element and next pixel, and select two the maximum in definite difference to determine this difference.For this problem is described, threshold value need serve as the basis based on Boundary Detection and border slope and dynamic change with pixel one by one.

Can detect based on subcarrier and further improve border/slope adaptive threshold.Typically in the digitlization composite signal, the noise at the boundary in the high frequency luminance part is higher than the noise at the boundary in the high frequency chrominance section, because sampling clock is locked in the colour burst part of subcarrier signal.In addition, the brightness border typically has comparatively precipitous slope than colourity border, and this is because the brightness border has the high-resolution up to about 5MHz.If boundary threshold is set to height and shelters the high frequency luminance noise at the boundary, the losing of true colourity motion of some associations then will be taken place.But if border/slope threshold value detects and the self adaptation that becomes based on subcarrier, then threshold logic cirtuic will be enhanced more effectively, and is as described below.

Be used for the border of adaptive threshold logic and the execution that subcarrier detects logical circuit

Accompanying drawing 9 shows one and comprises that Boundary Detection logic module (710) and subcarrier detect the schematic block diagram of the threshold logic cirtuic (120) of (SCD) logic module (720).Boundary Detection logic module to be described in detail below (710) comprises a logical circuit that allows user's setting threshold, as the percentage on border, just should distribute how many slope magnitude as boundary threshold.

Then this based on the threshold value on border by the SCD logic module (720) that the detects sub-carrier conditions more self adaptation that becomes.Also can describe SCD logic module (720) below in detail, but the following operation of SCD logic module (720) and affect Boundary Detection logic module (710) generally.The user can set two percentage to a specific border, for example, and x% and y%.If SCD logic module (720) does not detect subcarrier, then with x% as the slope percentage threshold, and if SCD logic module (720) has detected subcarrier, then with the slope percentage threshold of y% as this specific border.If being set to, x% is higher than y%, higher slope percentage threshold can be used for the brightness part of image and slope percentage threshold that will be lower is used for the chrominance section of image, lose and realizes that with pixel one by one be the dynamic threshold variation of basis based on SCD thereby reduce the colourity motion.Because this independently controls brightness and chrominance section, threshold logic cirtuic can be programmed the brightness noise at the boundary that suppresses serious and can not lose the colourity motion in a large number.

The SCD detection module

SCD detection module (720) checks that by ground, space (for example crossing over row) and time ground (for example crossing over frame) the subcarrier characteristic detects subcarrier.In spatial domain, because sampling clock is four times of subcarrier frequency and by burst locked at subcarrier, the alternate SC quantitatively approximately equal of sampling, but opposite on phase place or symbol.In addition, subcarrier changes phase place 180 degree in the ranks, and this also can use.In time-domain, subcarrier is with every frame 180 degree inverted phase, thus have marked difference between the adjacent frame and the frame of two frames of being separated by between have seldom difference.Therefore, by investigation time and spatial domain, carry out an approximate subcarrier and detect and control threshold logic cirtuic.As shown in Figure 9, SCD module (720) receives three frame tap F2, and F1 and F0 (just, present frame, the frame before former frame and the former frame) are used for subcarrier and detect.The SCD detection module that the definition that provides below will be described for the back is of great use:

1.CLD_ state 1_A is a status signal based on time chroma amplitude characteristic check, whether its indication sampling is colourity;

2.CLD_ state 1_B is a status signal of checking based on time colourity polar character, whether its indication sampling is colourity;

3.CLD_ state 2_A be one based on the space chroma amplitude of (one dimension) and the status signal of polarity check in current video is capable, whether its indication sampling is colourity;

4.CLD_ state 2_B be one based on crossing over triplex row (for NTSC delegation time delay interval and at interval) the space chroma amplitude of (two dimension) and the status signal of polarity check for PAL two line delays, whether its indication sampling is colourity; With

5. final

cld_ state

1,2, each of 3 can be above-mentioned CLD_ state 1_A/B/, any associating of 2_A/B status signal.These three independent design status signals can be used to control the movement threshold of three motion paths, i.e. low-frequency brightness motion path, high frequency luminance motion path, colourity motion path.

Can see that this CLD status signal can be single or many bit widths signal.

CLD state 1 (time-domain inspection)

With reference to the accompanying drawings 10, show the block diagram of the time detecting module 1010 of review time colorimetric properties in SCD logic module 720.Time detecting module 1010 receives three signal F0, F1 and F2 and threshold value input 1012.Time detecting module 1010 is come the review time colorimetric properties by analyzing the chroma amplitude of crossing over two frames and crossing over a frame subsequently.In an optional embodiment, can check chroma amplitude based on time symbol/polarity.The output of time detecting module 1010 is designated as CLD_ state 1, and indication is by the output of the time check of time detecting module 1010 execution.CLD_ state 1A is wherein based on chroma amplitude.

With reference to the accompanying drawings 11, show the schematic block diagram of a time detecting module 1110 in SCD logic module 720.Time detecting module 1110 comprises three received signal F0 respectively, the band pass filter of F1 and F2 (BPF) 1112,1114 and 1116.Three BPF1116,1114 and 1112 output is provided for respectively and is designated as (D1, D2, D3 and D4), three groups of delay cells of (D5, D6, D7 and D8) and (D9, D10, D11 and D12).Delay cell D1 is provided for the logic module 1118 that produces output CLD state 1_B to the output of D12.If it is identical and to cross over a frame be opposite that sampling symbol is crossed over two frames, then export CLD state 1_B for true.CLD_ state 1_B is wherein based on time polarity.

CLD state 2 (spatial domain inspection)

With reference to the accompanying drawings 12, show the view of the detection module 1210 that is used to check the space colorimetric properties.This module is checked the colorimetric properties in space and the symbol of checking chroma amplitude and four sampling in form by four adjacent sampling of search in 4fsc locking video flowing.Detection module 1210 comprises a band pass filter (BPF) 1212 that receives composite video signal (for example F2).The output of BPF1212 is offered four delay cell D1, D2, D3 and D4 respectively.Summed device 1216 additions of the output of the summed device 1214 of the output of delay cell D1 and D3 and delay cell D2 and D4.Two summing units 1214 and 1216 output in logic module 1218 by rectification and with threshold value (THR) relatively.Threshold value THR is the value that is set by the user and is stored in the controlled register.If the output of summing unit 1214 and 1216 is all less than THR then the output of logic module 1218 is logics one.Otherwise, be output as low.Another logic module 1220 receives output from delay cell D1 to D4.Logic module 1220 is checked the selectable sampling that is received to D4 by delay cell D1.If selectable sampling has opposite symbol, then the output of logic module 1220 is logics one.Otherwise, be output as zero.If the output of logic module 1218 and 1220 all is a logic one, then the output of logic module 1222 still is high.If it is low that one or two of logic module 1222 is input as, then be output as low.At last, in logic module 1126, if the output of logic module 1222 is logics one, then expanding this state is four sampling width, and other does not have expansion.The output of detection module is meant the CLD state 2_A of the chroma luminance state of the current line that is shown in the spatial domain.If state is 1, then CLD state 2 is considered to chroma state.Otherwise, be considered to luminance state.Module 1218 is comparison circuits of a rectification chroma amplitude differential signal that is used for relatively importing and user's preset threshold THR.Module 1220 is checked the opposite polarity (as the opposite polarity of the symbol of checking D1 and D3 sampling and the opposite in sign polarity of D2 and D4 sampling) of the symbol of selectable sampling.If be true, output logic one.Module 1222 is logical AND circuit.Module 1126 is the trigger part that are similar to accompanying drawing 19, if state is for carrying out for the moment signal extension.

Also can detect CLD_ state 2 based on the adjacent lines colorimetric properties.With reference to the accompanying drawings 13, show the detection module 1310 that another one is used to detect circumstances in which people get things ready for a trip degree characteristic.Detection module 1310 has three and is configured to receive triplex row time-delay sampling L1, the band pass filter of L2 and L3 (BPF) 1312,1314 and 1316 respectively.The line sampling L1 of time-delay, each among L2 and the L3 is by line sampling of time-delay from same.Three BPF1312,1314 and 1316 output is offered three groups of delay cells (D1, D2, D3 and D4) respectively, (D5, D6, D7 and D8) and (D9, D10, D11 and D12).Logic module 1318 is configured to receive the output of delay cell D1 to D12.

If it is identical and cross over the opposite of delegation to cross over the sampling symbols of two row, then logic module 1318 is output as logic one.In other words, be identical if cross over the sampling symbols of two row, (for example, the sampling of current sampling and two line delays all is the sampling of plus or minus) and what cross over delegation is opposite (for example, current sampling and delegation time-delay sampling has opposite symbol).This is that the output of BPF is marked as the 4fsc sampling owing to be bandpass filtering after the 4fsc composite video signal.

With reference to the accompanying drawings 14, show and mixed status signal Cld_ state 1 A, B and Cld_ state 2 A, the logic module of B.Logic module 1410 produces three state output Final_cld_ state _ 1, Final_cld_ state _ 2 and Final_cld_ state _ 3 and one a chrominance/luminance control signal from the input that receives.Signal Final_cld_ state _ 1 of three state outputs, Final_cld_ state _ 2 and Final_cld_ state _ 3 can be set at input signal Cld_ state 1 A independently, B and Cld_ state 2 A, the combination in any of B.Each of three output status signals can be controlled three different motion path threshold value control, for example low frequency movement path, high frequency colourity motion path and two frame motion paths.Logic module 1410 is the blenders able to programme that can carry out much different mixed functions.For example, can export according to following acquisition cld_ state 1: (i) logical AND of Cld_ state 1_A and CLD_ state 1_B; The (ii) logical AND of CLD state 1_A and CLD_ state 2_A; The (iii) logical AND of CLD state 2_A and CLD state 2_B; Or (iv) CLD_ state 1_A, B and CLD_ state 2_A, the logical AND of B.In addition, the combination of each above-mentioned input can be made up with logic OR and be replaced the logical AND operation.At last, final_cld_ state _ 1, the output of final_cld_ state _ 2 and final_cld_ state _ 3 signals is set at logic one or logical zero respectively independently.

The variable threshold logic module

Accompanying drawing 15 shows the schematic block diagram of a variable threshold logic module (710).As shown in Figure 15, the input composite signal, and select variable thresholding will be determined the present picture element (Pn) that is used for.Last pixel (Pn-1) on present picture element (Pn) and the horizontal direction and next pixel (Pn+1) are carried out logic relatively, and select maximum difference, as mentioned above.This maximum difference has been described the greatest gradient amplitude that detects.By selecting to be used for the present picture element (Pn) of current line respectively, carry out the corresponding definite of vertical direction in vertical difference estimation block with the pixel of the same position of previous row and next line.In case determined the slope of level and vertical direction respectively, just produced one group of threshold value that is used for present picture element.Threshold value is the linear scale about the slope value that detects.Proportionality constant can be changed.In certain embodiments threshold value can with the slope value nonlinear correlation that detects.And minimum and maximum amplitude limit function can be programmed on the threshold value that acts on calculating to be no more than the upper limit so that final threshold value can be programmed to have some minimum thresholds or be programmed for.In one embodiment, variable threshold logic module (710) can be determined the threshold value of several consecutive frames, F2 for example, F1 and F0 and determine that final threshold value is is maximum or the minimum value that respective frame is determined.

Variable threshold logic circuit (VTL) help to eliminate since the pixel value that sampling clock shake/variation causes at the spurious motion of the variation generation of signal boundary.Signal boundary is high more, for the shake of equal number, big more variation will take place.Therefore, the pixel that occupies steeper slope should have higher threshold value.Simultaneously, the motion value on these borders is high, so threshold value will can not sheltered real motion.By producing a ratio, for example, 10% of the slope that pixel is positioned at produces variable thresholding.The measurement (sampling that just, has two frame periods) that this ratio changes based on burst signal comes further self adaptation to determine.

In one embodiment, one the 3 horizontal form of tap and one 3 tap vertical form constitute one 5 tap adaptive threshold form.Accompanying drawing 16 shows the example of this 5 tap adaptive threshold form.Present picture element under threshold value is determined is positioned at the centre of corresponding form.Determine the absolute difference between present picture element and the adjacent image point and determine that the maximum difference in the difference of determining is a slope.For example, in accompanying drawing 16, present picture element value Pn compares with the

value

1,2,3 and 4 of pixel on every side respectively, and maximum difference is taken as the final slope of the threshold value that therefrom obtains pixel Pn.Make the fraction values self adaptation based on the brightness/chroma pixel value, for example, the x% or the y% that detect based on chrominance/luminance.

In one embodiment, according to following expression calculated level threshold value:

Vthr (level)=and [[Max{|Pn-(Pn-1) |, | Pn-(Pn+1) | }] * (decay able to programme)]+DC threshold value able to programme (minimum levels)

In one embodiment, decoder can detect a synchronizing signal border or burst signal zone and determine their motion change, for example, and by using firmware.Can be used to the percent of linear threshold value of programming for frame motion or the variation of two frame detection of motion, programmable threshold gain just.In addition, the threshold percentage of variation able to programme gain can be based on the chrominance/luminance that detects and self adaptation.Voting logic has a programmable minimum DC side-play amount equally.If threshold value has been crossed over programmable higher limit, maximum amplitude limit logical circuit arrives the upper limit with the output level amplitude limit.In perpendicular domains, for example cross over row, carried out identical logic.As will be understood by the skilled person in the art, the threshold percentage and the DC side-play amount of programming levels or vertical tap independently.Therefore, because vertical logic needs line storage, have only horizontal logic to be held, when the 2D line storage is shared.At last, as shown in Figure 9, from motion detection logic module (730) thus motion value deduct variable thresholding and produce a motion _ output valve.

Chrominance/luminance detects logical circuit

The chrominance/luminance of accompanying drawing 15 detects logic module (810) by checking that based on two factors colorimetric properties/symbol has detected the chrominance/luminance signal roughly.First factor is based on the 4fsc sampling.If the pixel of checking is the part of colourity loop, each selectable sampling approximately equal quantitatively then, but opposite on symbol.After rectification, the absolute difference of the adjacent image point in four colourity pixels should be similar to the same.Second factor is a chroma amplitude inspection.If greater than two frame differences, then detect colourity for rest image one frame difference, otherwise this pixel is not the colourity pixel just.

Based on above-mentioned two inspections, can determine that the pixel of decoding is positioned at colourity loop or luminance signal.In addition, determine based on this, determine the variable thresholding percentage respectively for the chrominance/luminance pixel, for example, brightness is 30% and colourity is 10%.Can see that threshold percentage (gain) and DC skew minimum and maximum limit amplitude can independently be programmed for each motion path.

Accompanying drawing 17-20 shows the more detailed view that chrominance/luminance detects the different piece of logical circuit (810).Accompanying drawing 17 shows the time chroma amplitude inspection that is used for checking respectively a frame and two frame differences, and to export one first chrominance/luminance state value be one or zero, wherein the logical circuit of numerical value one expression colourity.Accompanying drawing 18 shows and is used for checking quantitatively approximately equal of whether each optional sampling, but opposite in sign, and and to export one second chrominance/luminance state value be one or zero, wherein the logical circuit of numerical value one expression colourity.Accompanying drawing 19 shows the more detailed view of the colourity sampling comparison module of an accompanying drawing 18, if wherein detect colourity, 4 all triggers are set to one.At last, accompanying drawing 20 shows and how to compare the first and second chrominance/luminance state values to produce the final chrominance/luminance state value that is used by variable threshold logic module (710).

The APL self adaptation

PAL (line-by-line inversion) is a for example video standard of Europe use, and different with NTSC in many aspects.For the application's purpose, most important difference is subcarriers span two frames and phase phasic difference 180 degree, rather than one frame of the leap in NTSC.Therefore, per four frame subcarriers are homophases.For PAL, deduct the vision signal that is spaced apart two frames to produce the 3D carrier chrominance signal.By using a current frame and two frame time delayed signals to detect colourity motion (for example, F2, F1, F0 tap).

Accompanying drawing 21 show one be used for PAL detect the schematic block diagram of low frequency movement and its be similar to above with reference to the accompanying drawings the low frequency movement of the NTSC that describes of 4A and 4B detect, except these, PAL has only used two frame differences.

Accompanying drawing 22 show one be used for PAL detect the schematic block diagram of colourity motion and its be similar to above the colourity motion detection of the NTSC that describes of 5A and 5B with reference to the accompanying drawings, except these, be increased and amplitude limit for PALF0 and F2 signal, rather than subtract each other.

Accompanying drawing 23 shows one and only is used for the schematic block diagram that PAL detects M5_P brightness campaign.Should be noted that the logical circuit of describing in the accompanying drawing 18 has only provided the proper exercise that the zone of brightness is only arranged.If the logical circuit of accompanying drawing 18 uses in colored region, will cause big spurious motion.Will further explain the M5_P motion below.

Accompanying drawing 24 shows one and only is used for the schematic block diagram that PAL detects M6_P brightness campaign.Should be noted that the logical circuit of describing in the accompanying drawing 19 has only provided the proper exercise that the zone of brightness is only arranged.If the logical circuit of accompanying drawing 19 uses in colored region, will cause big spurious motion.Will further explain the M6_P motion below.

Accompanying drawing 25 shows a schematic block diagram that is used to detect the PAL motion.The PAL1 signal is used to the All Ranges of sensed luminance motion, and this signal is the M5_P that obtains shown in accompanying drawing 23,24 and 5A respectively, the maximum in M6_P and the M3_NP signal.The PAL2 signal is used to detect colourity motion and low-frequency brightness motion, and this signal is respectively as accompanying drawing 4A, and 21, the M1_NP of acquisition shown in the 6A and 22, M2_NP, M3_P, the maximum in M4_NP and the M8_P signal.PAL motion is confirmed as among PAL1 and the PAL2 maximum.

As shown in Figure 25, M8_P and M4_P PAL motion path have mask logic (M8 mask) circuit of the spurious motion of eliminating the colored stagnant zone generation of high frequency.Because carrier chrominance signal can not superpose by two frames that are used for the high frequency colored region and eliminate, and just needs M8 mask logic circuit.Carrier chrominance signal comprises the brightness that approaches subcarrier frequency, and it has caused that vision signal is not to cross over phase difference 180 degree of two frames.Therefore, M8 mask logic circuit has been sheltered the spurious motion and because the spurious motion that the colourity color conversion causes of static high frequency colored region.Accompanying drawing 28 shows a M8 mask logic circuit in more detail.As shown in Figure 28, M8 mask logic circuit receives following input: M1_NP, M2_NP, M3_P, M4_NP, M5_P, M6_P, M8_P, F2, F1 and F0, CLD STATUS, M8 mask En, and M8_MASK_threshold_control_regs.M8 mask logic circuit check characteristics of signals, space chromaticity for example, time chromaticity, low frequency movement is crossed over F2, the carrier chrominance signal polarity of F1 and F0 and leap F2, the mean value of the 4-sampling form of F1 and F0, and produce a mask signal (M8_Mask).In the embodiment shown in Figure 28, before the mask signal was further handled by the PAL motion detection block, expansion/expansion logical circuit also was used to the M8_Mask signal.

In one embodiment, when using a frame colourity, also has a little mask logic circuit that is used for the NTSC pattern.When using frame colourity motion, because the mode difference that composite signal forms may produce spurious motion by a frame colourity motion circuit.The mask logic electric circuit inspection is also sheltered these spurious motions.

Accompanying drawing 26 shows a schematic block diagram that how to produce the 3D carrier chrominance signal.As shown in Figure 21,, utilize frame F2 and F0 to produce 3D colourity, otherwise, utilize frame F2 and F1 to produce 3D colourity for NTSC for PAL.Also having a bypass that is used for 3D chroma strip bandpass filter selects.In one embodiment, acquiescence is to use bypass to select, and makes whole bandwidth can be used to carrier chrominance signal.But if owing to some reasons, big bandwidth has produced distortion, and for example colourity is overflowed, and for example, low frequency movement can not be realized on this path by band pass filter.

At last, accompanying drawing 27 shows the schematic block diagram of the final motion detection of a system that is used to make up NTSC/PAL.NTSC motion is M1_NP, and M2_NP is maximum in M3_NP and the M4_NP signal, as above 7 description with reference to the accompanying drawings.The generation of PAL motor message such as top 25 description with reference to the accompanying drawings.Based on a NTSC/PAL mode detection signal, select NTSC_MOTION or PAL_MOTION signal.The motor message of selecting is filtered with the elimination spiking in 3 tap median filter subsequently, and is reduced to 5 bits at last so that motor message has maximum 16.Motor message is imported into the blender (110) of accompanying drawing 2 subsequently, itself and as described above 2D and 3D decoding make up.

The present invention can be at the digitalized electron circuit, perhaps at computer hardware, and firmware, software, or carry out in their combination.Equipment of the present invention can be stored at one and be used for the computer program that programmable processor carries out in the machine readable memory device and carry out, and method step of the present invention can be carried out one by programmable processor and is used for by operation input data and produces the instruction repertorie that output carries out function of the present invention carrying out.The present invention can preferably be embodied as a computer program, it has at least one coupling to receive the programmable processor of data and instruction or transmission data and instruction, a data storage system carries out on the programmable system of at least one input unit and at least one output device.If desired, each program is implemented as on the high-level program or object oriented programming languages, or compilation or machine language; In some cases, this language can be compiling or interpreter language.Suitable processor comprises, illustrates, the microprocessor of common or specific purposes.Usually, processor will receive instruction and data from read-only memory and/or in the random access storage device.Usually, computer comprises one or more mass storage device that are used for storing data files; This device comprises disk, for example internal hard drive and displacement disc at quarter; Magnetic-CD; And CD.Be suitable for specifically including the nonvolatile memory that storage computation machine program command and memory of data device comprise form of ownership, comprise for example semiconductor memory system, EPROM for example, EEPROM, and flash memory device; The disk of internal hard drive and displacement disc for example; Magnetic-CD; And CD-ROM dish.Aforesaidly anyly can be replenished or be merged among the ASIC (application-specific integrated circuit (ASIC)).

For the interactivity with the user is provided, the present invention can be implemented in one have monitor for example or LCD display on the computer of the display of user's display message.The user can be by for example keyboard and indicating device, mouse for example, tracking ball, microphone, touch-screen, sensor card reader, magnetic or paper tape reader, board, contact pilotage, sound or font discriminator, or any input equipment that other is known as, apparently, the various input units of other computer provide input to computer.Computing system can be programmed provides a graphic user interface, is undertaken alternately by its computer program and user.

At last, processor can optionally utilize network connection and computer and communication network coupling, and for example, internet, or in-house network can be from network receiving informations by its processor, or during carrying out the said method step to network output information.This information is typically expressed as a command sequence of utilizing processor to carry out, can receive or export to network from network, for example, realizes ground computer data signal form with carrier wave.Said apparatus and material are known for the technical staff of computer hardware and software field.

Should be noted that the operation that the present invention has used multiple computer to carry out comprises the data that are stored in the computer system.These operations include, but are not limited to the physical operations of these required physical quantitys.Usually, though be not necessary, these quantity adopt and are suitable for storage, transmission, and combination is compared or the electronics of other operation or the form of magnetic signal.The operation of a composition described herein part of the present invention is useful machine operation form.The execution of operation is described to term usually, for example, produces, and identification, operation is determined, relatively, carries out, and downloads, or detects.Owing to normally used reason, these electronics or magnetic signal are described to usually as bit, numerical value, and element, variable, character, data, or similarly.Yet can expect, these and similarly term all be associated and only be the mark easily that is applied to these quantity with suitable physical quantity.

The invention still further relates to a kind of device, system or equipment that is used to carry out aforesaid operations.This system specifically is configured to required purpose, perhaps can be the all-purpose computer that is selectively activated or disposed by the computer program that is stored in the computer.Above-mentioned processing is not to relate to any certain computer or other computing equipment regularly.Especially, various all-purpose computers can use according to teaching the program of being write herein, perhaps optionally, more advantageously construct a more special computer system and realize required operation.

A plurality of embodiment of the present invention has been described here.Yet the various modifications that do not exceed the spirit and scope of the present invention all allow.For example, NTSC and the PAL vision signal of using with reference to typical case in broadcast television signal described the present invention, but the present invention can also be used for synthetic video, the video of for example exporting from DVD player.Therefore, other embodiment is included in the scope of following claim.

Claims

1, a kind of equipment comprises;

Video Decoder, be configured to receive one modulated and have the composite video signal of luminance component and chromatic component on subcarrier signal, this Video Decoder is configured to luminance component in a plurality of frequency ranges and chromatic component are carried out the motion detection operation respectively;

Variable threshold logic circuit (VTL) is coupled to Video Decoder, and is configured to provide each a unique threshold value that is respectively applied in a plurality of frequency ranges to Video Decoder; With

Subcarrier detects logical circuit, is coupled to variable threshold logic circuit (VTL), and is configured to detect subcarrier signal by the room and time characteristic of checking subcarrier detection logical circuit.

2, equipment as claimed in claim 1, wherein subcarrier detection logical circuit is configured to receive one first frame, one second frame and one the 3rd frame, and wherein first frame is a present frame, second frame is the former frame with respect to present frame, and the 3rd frame is before this former frame.

3, equipment as claimed in claim 1, wherein subcarrier detects the time chromatic component that logical circuit is configured to check by the chroma amplitude of analyzing first frame of crossing over subcarrier signal and second frame and crossing over the single frame of subcarrier signal subsequently subcarrier signal.

4, equipment as claimed in claim 1, wherein subcarrier detects the time chromatic component that logical circuit is configured to check by the time polarity of analyzing subcarrier signal subcarrier signal.

5, equipment as claimed in claim 2, wherein subcarrier detection logical circuit further comprises: be configured to receive first frame respectively, first band pass filter of second frame and the 3rd frame, second band pass filter and the 3rd band pass filter; With

Be configured to from first band pass filter, second band pass filter and the 3rd band pass filter receive first delay cell of output, second delay cell and the 3rd delay cell, and this first delay cell, second delay cell and the 3rd delay cell are stored first frame respectively, four adjacent sampling of second frame and the 3rd frame.

6, equipment as claimed in claim 1, wherein subcarrier detection logical circuit further comprises:

Receive the band pass filter of composite video signal;

Four delay cells are coupled to this band pass filter, and are configured to store respectively four sampling from this band pass filter;

First summing unit of the sampling addition that will in the first and the 3rd delay cell, store;

Second summing unit of the sampling addition that will in the second and the 4th delay cell, store;

Rectification is also compared the output of first and second summing units and the rectifier cell of threshold voltage;

Produce first logical circuit of first signal of first logic state when being used for output at described two summing units less than threshold voltage;

Be used for when the alternate sampling from four delay cells is opposite logic states, producing second logical circuit of the secondary signal of first logic state;

Be used for when first signal and secondary signal all are first logic state, producing the 3rd logical circuit of a chroma state signal.

7, equipment as claimed in claim 1, wherein subcarrier detects the circumstances in which people get things ready for a trip degree characteristic that logical circuit further is configured to detect composite video signal, and this subcarrier detects logical circuit and further comprises:

Be configured to receive first row of composite video signal, first band pass filter of second row and the third line, second band pass filter and the 3rd band pass filter;

Be coupled to first band pass filter respectively, first delay cell of second band pass filter and the 3rd bandpass filter, second delay cell and the 3rd delay cell, this first delay cell, each of second delay cell and the 3rd delay cell all is configured to store the four lines sampling; With

Be received in first delay cell, the line sampling of storing in second delay cell and the 3rd delay cell is to produce the logical circuit of a circumstances in which people get things ready for a trip degree signal.