CN100592780C - Pull-down detection apparatus and pull-down detection method - Google Patents

Pull-down detection apparatus and pull-down detection method Download PDF

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CN100592780C
CN100592780C CN 200610009418 CN200610009418A CN100592780C CN 100592780 C CN100592780 C CN 100592780C CN 200610009418 CN200610009418 CN 200610009418 CN 200610009418 A CN200610009418 A CN 200610009418A CN 100592780 C CN100592780 C CN 100592780C
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pixel
field
comparator
change
signal
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CN1825940A (en
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冨士和浩
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恩益禧电子股份有限公司
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Abstract

A pull-down detection apparatus includes a pixel comparator at least performing pixel comparison between a subsequent field and a present field and horizontal pixel comparison in the subsequent fieldand the present field to determine a presence of a pixel change between the subsequent field and the present field, a field comparator determining a presence of an image change between the subsequentfield and the present field based on a determination result in the pixel comparator, and a pull-down determinater determining that the input video signal is generated by pull-down processing based ona history of a determination result in the field comparator.

Description

下变换检测装置和下变换检测方法 The change detection means and the change detection method

技术领域 FIELD

本发明涉及一种下变换检测装置和下变换检测方法,用于检测隔行视频信号是否是由下变换处理所生成的。 The present invention relates to a detection apparatus and a detection method for the conversion down conversion, interlaced video signal for detecting whether or not the conversion process is generated.

背景技术 Background technique

当将以24帧/秒格式记录的商业影片转换成以60场/秒格式记录的NTSC视频信号的时候,进行了2-3下变换处理,即从原始图像的2个帧创建出5个场。 When the conversion will be 24 frames / second video format recorded commercials into an NTSC video signal recorded at 60 fields / second format when the conversion processing performed at 2-3, i.e., to create five fields from 2 frames of the original image . 当将以24帧/秒格式记录的商业影片转换成以50场/秒格式记录的PAL视频信号,以及将以30帧/秒格式记录的商业影片转换成以60场/秒格式记录的NTSC视频信号的时候,进行了2-2下变换处理, 即从原始图像的1个帧创建出2个场。 When converting commercial film will be 24 frames / second format to a recording PAL video signals recorded at 50 fields / second format, and will convert commercial films 30 frames / second into a recording format of a recording 60 fields / sec NTSC video format when signal conversion process performed at 2-2, i.e. from the two fields to create one frame of the original image.

另一方面,当显示隔行视频信号时,例如60场/秒的NTSC信号和50场/秒的PAL信号,都需要进行将隔行视频信号转换为逐行视频信号的隔行/逐行转换(以下称为IP转换)。 On the other hand, when displaying an interlaced video signal, for example NTSC signals of 60 fields / second and 50 fields / second PAL signals, we need to be converting interlaced video signals to progressive video signals of interlace / progressive conversion (hereinafter referred to as to IP conversion). IP转换用于生成隔行视频信号中的缺少的行从而生成逐行信号。 IP converter for generating the missing lines of an interlaced video signal to generate a progressive signal.

在IP转换中,用于创建缺少行的像素数据的方法包括,场内内插值(interpolation)和场间内插值。 In the IP conversion, the pixel data used to create the missing row methods include, field interpolated (interpolation) and the inter-field interpolation. 场内内插值根据与该缺少行相邻的两行的像素数据内插值出该缺少行的像素数据。 Intra-field interpolated pixel data of the interpolation line based on the lack of the missing pixel data of two lines adjacent row. 场间内插值则根据连续两个场的该行的像素数据内插值出该缺少行的像素数据。 Inter-field interpolation is the interpolation of the missing pixel data row based on the row of the pixel data of two consecutive fields.

然而,通过对下变换处理(例如2-2下变换处理)所生成的隔行信号(以下称为下变换信号)进行场内内插值而进行IP转换,将导致获得的帧信号与下变换之前的原始图像相比具有较低的垂直分辨率。 However, by the interlaced signal conversion processing (e.g. down-conversion process 2-2) generated (hereinafter, referred to as the converted signal) by interpolating the field to perform IP conversion, it would lead to a frame signal obtained before the down-conversion compared to the original image has a lower vertical resolution. 此外, 在场间内插值的情况下,如果使用由不同帧创建的两个场来生成一个帧信号,'会由于梳状噪音或其他类似原因而导致图像质量的恶化。 Further, the case where the interpolation between fields, if used to generate a frame signal fields created by two different frames, 'comb due to noise or other similar causes leading to deterioration in image quality.

为了避免图像质量恶化,当对通过下变换处理生成的隔行信号进行IP转换时,最好通过对由相同帧生成的两个场信号进行结合来创建一个帧信号。 To avoid degradation in image quality, when the process by the conversion of the interlace signal generated IP conversion, preferably by binding of the two fields of the same frame signal generated by the signal to create a frame. 这样可以防止图像质量恶化。 This prevents deterioration of image quality. 这种利用下变换信号的规律性来进行的IP转换称为反向下变换处理。 This use of the IP conversion performed signal converted regularity is referred to as the inverse transform processing.

图19示出了反向2-2下变换处理的一个例子。 FIG 19 shows an example of the 2-2 reverse conversion process. 图19示出了用于从30P (30帧/秒)的帧信号获得601 (60场/秒)的场信号而进行的2 — 2下变换处理,以及用于从601 (60场/秒)的帧信号获得60P (60帧/秒)的场信号而进行的反向2 — 2下变换处理。 FIG 19 shows a signal frame 2 for obtaining 30P (30 frames / sec) from 601 (60 fields / second) is carried out field signal - conversion process for 2, as well as for from 601 (60 fields / sec) 2 inverted field signal obtained signal frame 60P (60 frames / sec) is carried out - the down-conversion process. 例如,2 — 2下变换处理由30P的帧1创建出包含帧1的奇数行的场图像1T和包含帧1的偶数行的一个场图像1B。 For example, 2 - 2 conversion process to create a field image 1B 1T field image comprises odd lines of the frame 1 and comprises a frame 1 by the even-numbered lines of the frame 1 30P. 另一方面,反向2 — 2下变换处理根据由相同帧创建出的场图像1T和1B来内插值出缺少行,从而创建出帧1一1和帧1—2两个帧。 On the other hand, reverse 2 - 2 conversion processing in accordance with the same frame created by the field images 1T and 1B within the interpolated missing lines to create a frame 1 and a 1-frame two frames 1-2. 对帧2和随后的帧也进行相同的处理。 Frame 2 and subsequent frames are also subjected to the same treatment.

公开号为No.2004-242196的日本未审专利申请中描述了一种2 — 2 下变换检测装置,可以检测出隔行视频信号是2 — 2下变换信号;以及一种逐行转换装置,其根据2 — 2下变换信号的检测,利用根据相同帧所创建的两个场进行IP转换。 Patent Application Publication No. Japanese Unexamined No.2004-242196 describes a 2 - 2 change detection means can detect the interlaced video signal is a 2 - 2 the converted signal; and one progressive conversion device the 2 - detection of the converted signal, the IP conversion performed using the two fields of the same frame according to the created. 图18A示出了这里公开的2 — 2下变换检测装置的一个例子。 18A shows a 2 disclosed herein - an example of the change detection means 2.

图18A中的2 — 2下变换检测装置90包括像素差比较器91 ,失配像素数比较器92和下变换规律检测器93。 FIG. 18A 2--2 change detection device 90 includes the pixel difference comparator 91, the number of mismatched pixels comparator 92 and the detector 93 conversion rule.

像素差比较器91计算当前场信号b的像素bl的像素值和紧接在当前场信号b之后的场信号a的像素al的像素值,并且如图18B所示将该差值与阈值相比较。 Pixel difference comparator 91 calculates the pixel value of the pixel value of the pixel of the current field signal bl b of the current field and the immediately following field signal a signal b of the pixel al, and the difference with the threshold value as shown in FIG. 18B is compared . 像素al和bl所处的位置在屏幕上看起来基本上是相同的。 Al and bl which the position of a pixel on the screen appears substantially the same. 具体的,像素al和bl位于相同的水平位置,而包含像素bl的行相邻地位于包含像素al的行的下面。 Specifically, al and bl pixel located at the same horizontal position, and the row including the pixel bl containing the pixel located below the adjacent row al. 如果比较结果表示像素bl和像素al之间的像素值差超过了预定的阈值R1,则将一信号置为"1",表示将像素的变化提供到失配像素数 If the comparison result indicates a pixel value difference between the pixel and the pixels al bl exceeds a predetermined threshold value R1, a signal will be set to "1" indicating the pixel is provided to change the number of mismatched pixels

比较器92。 Comparator 92. 另一方面,若差值在阈值R1以下,则将信号置为"0",表示没有像素的变化提供到失配像素数比较器92。 On the other hand, if the difference in the threshold value R1, a signal is set to "0" indicating that the pixel does not change the number of mismatched pixels is supplied to the comparator 92.

失配像素数比较器92从像素差比较器91接收信号,在一个场的期间内对像素差比较器91检测到的像素值变化的数目进行计数,然后在该场结束时将计数的数目与预定阈值R2相比较。 The number of value change mismatch pixel count comparator 92 receives the signal of the pixel difference comparator 91 from within one field period of the pixel difference comparator 91 detects the pixel counts and the count at the end of the field and comparing a predetermined threshold value R2. 若计数值超过了阈值R2,则失配像素数比较器92将设置为"1"的一个信号提供到下变换规律检测器93,该设置为"1"的信号表示场信号a和b是由不同的帧生成的。 If the count value exceeds the threshold value R2, the mismatch of the number of pixels of the comparator 92 is set is supplied to the conversion law detector 93 to a signal "1", which is set to "1" signal indicates the field signals a and b is different frame generated. 另一方面,若计数值在阈值R2以下,则将设置为"0"的一个信号提供到下变换规律检测器93,该设置为"0"的信号表示场信号a和b是由相同的帧生成的。 On the other hand, if the counter value less than the threshold value R2, will be set to provide a "0" in the conversion rule to a signal detector 93, which is set to "0" indicates a signal field signals a and b are of the same frame Generated.

如果失配像素数比较器92的输出信号的模式是1和0交替重复,例如"1010..."或"0101...",则下变换规律检测器93判断2 — 2下变换信号具有规律。 If the output signal of the mode mismatch pixel count comparator 92 is 0 and 1 are alternately repeated, such as "1010 ..." or "0101 ...", the next conversion law detector 93 determines 2--2 having the converted signal law. 另一方面,若失配像素数比较器92的输出信号没有存在该重复模式,则下变换规律检测器93判断2 — 2下变换信号不存在规律。 On the other hand, the output signal with the number of pixels regret comparator 92 is not the repeating pattern is present, the detector 93 determines conversion rule 2 - 2 law converted signal does not exist.

如上所述,下变换检测装置判断一个图像是否在相邻场之间变化并且观察该判断结果的规律性,从而检测其是否为下变换信号。 As described above, the change detection means determines whether an image change between adjacent fields and observing the result of the determination of regularity, so as to detect whether it is down-converted signal. 因此, 为了准确地检测下变换信号,图18A所示的2 — 2下变换检测装置90需要通过像素差比较器91准确地判断各像素单元的变化,并且通过失配像素数比较器92准确地判断各场单元的变化。 Accordingly, in order to accurately detect the converted signal, as shown in FIG. 18A 2 - change detection means 90 for 2 needs to accurately determine the variation of each pixel unit through the pixel difference comparator 91, and the number of pixels by the mismatch of the comparator 92 to accurately Analyzing changes in each field unit.

传统的下变换检测装置,例如图18A所示的2 — 2下变换检测装置90,是通过利用当前场b的像素和后一场a的像素在时间和垂直方向上的 Change detection means in the conventional example 2 shown in FIG 18A - 2 the change detection means 90, by using the current field and pixels b after a time and in a vertical direction

像素比较结果来检测图像变化的。 Detecting an image pixel comparison result changes. 然而,这种传统的比较方式很容易将存在特殊变化的图像错误地判断为图像没有变化,例如当显示图像包含斜线和物体边界这样的高频部分(以下称为边缘部分)的时候。 However, this conventional way of comparison it is easy to change the special image is present is erroneously determined not change the image, for example, when displaying an image containing such a high-frequency portion shaded boundary of the object (hereinafter, referred to as an edge portion) of the time.

例如,当像素值的变化在水平方向上很大时,这意味着显示图像包含例如斜线和物体边缘这样的高频部分(边缘部分)。 For example, when a large change in pixel values ​​in the horizontal direction, which means high frequency part of a display image comprising such objects and oblique edge (edge ​​portion), for example. 该边缘部分很可能也在垂直方向上具有高垂直频率的边缘部分。 This edge portion is likely to also have an edge portion of the high vertical frequencies in the vertical direction. 这种情况下,尽管在该像素场和后一场之间没有图像变化,但是由于边缘部分导致的像素值差,使得传统的下变换检测装置极有可能错误地判断图像存在变化。 In this case, although there is no change in the image between the field and after a pixel, but since the pixel value of the edge portion results in a difference, the traditional conversion of the detection means erroneously judged likely there is a change images.

此外,在后一场a和当前场b之间的像素值变化非常大的像素中, 即,时域变化很大的情况下,即使传统的下变换检测装置检测到了像素值的变化,它也不能判断这是由于场之间的图像变化引起的还是由于高频图像的边缘部分而引起的。 Further, after a change in pixel value between the current field and a very large pixel b, i.e., a large temporal change in the case, even under conventional change detection means detects a change in pixel values, it this is due to not determine the image change between the high-frequency field or due to the edge portion of the image caused. 如果这样的像素被添加到图像变化的判断中,那么即使后一场a和当前场b是由相同帧创建的,也很可能会出现对图像变化的错误判断。 If such pixels are added to determine the change in the image, even if after a a b and the current field is created by the same frame, it is likely to misjudge the image change occurs.

如前所述,本发明已经认识到传统的下变换检测装置很可能会将没有图像变化的图像错误地判断为存在图像变化的图像,因此对下变换信号的检测具有较低的准确性。 As described above, the present inventors have recognized that the conventional change detection device will probably not change the image of the image erroneously determines there is an image change in the image, and therefore have a lower detection accuracy of the transformed signal.

发明内容 SUMMARY

根据本发明的一方面,提供了一种下变换检测装置,用于检测输入视频信号是否是由下变换处理所生成的,该装置包括像素比较器, 至少进行下述比较:在输入视频信号中包含的第一场和第二场之间进行像素比较,所述第二场位于所述第一场的之前一场,以及在第一场和/或第二场中进行水平像素比较,从而判断在第一场和第二场之间是 According to an aspect of the present invention, there is provided at one kind of change detection means for detecting whether the input video signal is generated by the conversion process, the apparatus comprising a pixel comparator for comparing at least the following: the input video signal comprising pixel comparison between the first field and the second field, the second field located before a first field, and comparing horizontal pixels in the first field and / or the second field, to determine between the first and second fields are

否存在像素变化;场比较器,用于对像素比较器中的判断结果进行汇集(compile),以及根据像素比较器的判断结果来判断在第一场和第二场之间是否存在图像变化;以及下变换判断器,用于根据场比较器号是否由下变换处理而生成。 No change pixel exists; field comparator, the judgment result for the pixel in the comparator may be accumulated (the compile), and a pixel based on the result of comparison to determine whether there is an image change between the first and second fields; and the change determination unit, whether generated by the conversion processing based on the field the comparator number.

本装置还可以在像素变化的判断条件中增加水平像素比较结果。 The device can also result in increased levels of pixel comparison pixel determination condition change. 从而可以从被检测像素中排除在水平方向上像素值变化很大的像素, 从而避免了由于存在边缘部分而导致的错误判断,并提高了对图像变化的判断准确性。 Whereby in the horizontal direction can exclude a large pixel value variation detection pixels from the pixel, thereby avoiding erroneous determination caused by the presence of the edge portion, and to improve the accuracy of determination of image change.

根据本发明的另一方面,还提供了一种下变换检测装置,用于检测输入视频信号是否由下变换处理而生成,该装置包括像素比较器, 其至少进行如下比较:在输入视频信号中包含的第一场和在第一场之前一场的第二场之间进行像素比较,以及在第一场和第一场之前两场的第三场之间进行像素比较,从而判断在第一场和第二场之间是否存在像素变化;场比较器,用于汇集像素比较器中的判断结果,以及根据像素比较器的判断结果来判断在第一场和第二场之间是否存在图像变化;以及下变换判断器,用于根据场比较器的判断结果的历史来判断输入视频信号是否由下变换处理而生成。 According to another aspect of the present invention, there is provided change detection means at one of the input video signal for detecting whether generated by the conversion process, the apparatus comprising a pixel comparator for comparing at least the following: the input video signal comprising a first field and a pixel between a first field of the field before the second comparison, and the comparison between the pixel and the first field before the first field of two third, the first to determine the whether there is a change between pixels and second fields; field comparator, for determining whether results are summarized pixel comparators, and a pixel based on the result of the comparator to determine whether there is an image between a first field and a second field change; and a lower conversion is determined, a determination means for determining based on the history of the result of the comparator input video field signal is generated by the conversion process.

本装置还可以在像素变化的判断条件中增加时域像素比较结果。 The device can further increase the temporal pixel comparison result of the pixel determination condition change. 从而可以从被检测像素中排除在时域方向上像素值变化很大的像素, 从而避免了对在时域方向变化很大的图像的错误判断,并提高了对图像变化的判断准确性。 It can be excluded in the time domain direction of a large pixel value variation detection pixels from the pixels, so as to avoid misjudgment of the image changes greatly in the time domain direction, and improve the accuracy of the determination of image change.

根据本发明的一方面,提供了一种下变换检测方法,用于检测视频信号是否由下变换处理而生成,该方法包括,对输入视频信号中包含的第一场和位于该第一场之前一场的第二场之间的像素差值进行测量并将该差值与第一阈值相比较;水平地测量第一场和/或第二场中的像素的差值并将该差值与第二阈值相比较;根据与第一阈值和第二阈值的比较结果来判断在第一场和第二场之间存在的像素变化;根据是否存在像素变化的判断结果来判断在第一场和第二场之间是否存在图像变化;根据是否存在图像变化的判断结果的历史来判断输入视频信加水平像素比较结果。 According to an aspect of the present invention, there is provided a method for detecting the one kind of transformation, for detecting whether a video signal generated by the conversion process, the method comprising, input video signal included in the first field and the first field is located before the difference between the pixels of a second field is measured and the difference is compared with a first threshold value; level difference measured first field and / or the second field and a pixel with the difference comparing a second threshold value; result of the comparison with the first threshold and the second threshold value is determined pixel variation between the first and second fields of presence; based on the determination result of whether there is a change to the pixel is determined in the first field and whether there is an image change between the second field; Analyzing the input video signal is applied to the pixel level in accordance with the comparison result whether there is a history of the determination result of the image changes. 从而可以从被检测像素中排除在水平方向上像素值变化很大的像素, 从而避免了由于存在边缘部分而导致的错误判断,并提高了对图像变化的判断准确性。 Whereby in the horizontal direction can exclude a large pixel value variation detection pixels from the pixel, thereby avoiding erroneous determination caused by the presence of the edge portion, and to improve the accuracy of determination of image change. 根据本发明的另一方面,还提供了一种下变换检测方法,用于检测视频信号是否是由下变换处理而生成的,该方法包括,对在所述视频信号中包含的第一场和位于所述第一场之前一场的第二场之间的像素差值进行测量,并将该差值与第一阈值相比较;对第一场和位于所述第一场之前两场的第三场之间的像素差值进行测量,并将该差值与第二阈值相比较;根据第一阈值和第二阈值之间的比较结果来判断在第一场和第二场之间是否存在像素变化;汇集一个场的存在像素变化的判断结果并根据汇集结果来判断在第一场和第二场之间是否存在图像变化;以及根据是否存在图像变化的判断结果的历史来判断输入视频信号是否由下变换处理而生成。 According to another aspect of the present invention, there is provided a down-conversion detection method for detecting whether a video signal is generated by the conversion process, the method comprising, for a first field contained in the video signal, and pixel difference between said first field before a second field measurement, and the difference is compared with a first threshold value; and located on the first field of the two fields before the first field pixel difference values ​​between three measurements, and the difference is compared with a second threshold; according to the result of comparison between the first threshold and the second threshold value to determine whether there is between the first and second fields change pixel; aggregation determination result of the presence of a change in the pixel field and pooled according to the results to determine whether there is an image change between the first and second fields; and an input video signal is determined based on historical results of the determination of whether there is an image change whether generated by the conversion process. 本方法还可以在像素变化的判断条件中增加时域像素比较结果。 This method may also increase the time-domain pixel pixel comparison result determination condition change. 从而可以从被检测像素中排除在时域方向上像素值变化很大的像素, 从而避免了对在时域方向变化很大的图像的错误判断,并提高了对图像变化的判断准确性。 It can be excluded in the time domain direction of a large pixel value variation detection pixels from the pixels, so as to avoid misjudgment of the image changes greatly in the time domain direction, and improve the accuracy of the determination of image change. 本发明可以提供一种具有较高准确性的检测下变换信号的下变换检测装置和下变换检测方法。 The present invention can provide a change detection means having transformed signal detected at higher accuracy and change detection method. 附图说明通过以下详细描述并结合附图,本发明的上述和其他目的、优点及特性将变得更加清楚。 BRIEF DESCRIPTION the following detailed description in conjunction with the accompanying drawings, the above and other objects, advantages and features of the present invention will become more apparent. 图l示出了根据本发明实施例的逐行转换装置的框图;流程图;图5示出了输入信号处理器的示例结构的框图;图6示出了像素比较器的示例结构的框图;图7示出了场比较器的示例结构的框图;图8示出了下变换判断器的示例结构的框图;图9示出了下变换判断器中的阈值变化操作的流程图;图10示出了根据本发明实施例的逐行转换装置的框图;图11示出了根据本发明实施例的2-2下变换检测装置的框图;图12示出了输入信号处理器的示例结构的框图;图13示出了像素比较器的示例结构的框图;图14示出了根据本发明实施例的逐行转换装置的框图;图15示出了根据本发明实施例的2-2下变换检测装置的框图;图16示出了输入信号处理器的示例结构的框图;图17示出了像素比较器的示例结构的框图;图18A示出了传统的2-2下变换检测装置的框图;图18B示出了描述传统的 Figure l shows a block diagram of a progressive conversion apparatus according to an embodiment of the present invention; flowchart; FIG. 5 shows a block diagram illustrating a configuration of the input signal processor; FIG. 6 shows a block diagram illustrating a configuration of a pixel of the comparator; Figure 7 shows a block diagram of the field exemplary configuration of a comparator; FIG. 8 shows a block diagram of an exemplary configuration of the conversion decision unit; FIG. 9 shows a flowchart of the threshold variation downconversion determiner in operation; FIG. 10 shows a block diagram of a progressive conversion apparatus according to an embodiment of the present invention; FIG. 11 shows a block diagram of a 2-2 pull down detection apparatus according to an embodiment of the present invention; FIG. 12 shows a block diagram illustrating the configuration of input signal processor ; FIG. 13 shows a block diagram illustrating a configuration of a pixel comparator; FIG. 14 shows a block diagram of a progressive conversion apparatus according to an embodiment of the present invention; FIG. 15 shows a change detection at 2-2 according to embodiments of the present invention a block diagram of the device; FIG. 16 shows a block diagram illustrating a configuration of the input signal processor; FIG. 17 shows a block diagram illustrating a configuration of a pixel comparator; FIG. 18A shows a block diagram of a conventional 2-2 pull detection means; FIG 18B shows a diagram illustrating a conventional 下变换检测中的参考像素的视图;图19示出了描述反向下变换处理的视图。 The change detection pixel of the reference view; FIG. 19 shows a bottom view depicting reverse conversion process. 具体实施方式下面将参照示意性实施例来说明本发明。 DETAILED DESCRIPTION OF EMBODIMENTS Reference will now be described exemplary embodiments of the present invention. 本领域技术人员应当知道,利用本发明的教导可以很容易地实现多种变换实施例,本发明并不局限于这些用于说明解释目的的实施例。 Skilled in the art will appreciate that using the teachings of the present invention can be easily implemented conversion various embodiments, the present invention is not limited for purposes of description explains embodiments. 下文中将参照附图来描述本发明的特定实施例。 Particular embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. 下面的实施例将本发明应用于用于检测2-2下变换信号的2-2下变换检测装置和用于检测2-2下变换信号的逐行转换装置,并实现IP转换。 The following Examples 2-2 of the present invention, the change detection means for detecting the converted signal, and 2-2 P conversion means for detecting the signal applied to a 2-2 conversion, and implement the IP conversion. 第r实施例图1示出了逐行转换装置100的结构,它包括根据本发明第一实施例的2-2下变换检测装置10。 R of Example 1 shows a structure of a progressive conversion apparatus 100, which includes the 2-2 conversion means detecting a first embodiment of the present invention 10 according to the embodiment. 在该逐行转换装置100中,除所述2-2下变换检测装置10以外的其他元件均与传统逐行转换装置中的相应元件相同。 In the progressive conversion means 100, other elements in addition to the change detection means 2-2 at 10 are the same as in the conventional progressive conversion means corresponding elements. 下面将说明所述逐行转换装置100的结构。 Converting apparatus will be explained the structure of the 100 row. 场延迟电路l和2是用于将60场/秒的场信号延迟一个场周期的存储器。 Field delay circuit 2, and l is the signal for field 60 fields / second delay of one field period of the memory. 由于场延迟电路1和2延迟了到逐行转换装置100的输入场信号, 场信号a、场延迟电路l的输出信号b、场延迟电路2的输出信号c变为三个连续场信号。 Since the output signal of the field delay circuit 1 b, and the second delay signal to the input field progressive conversion apparatus 100, the field signals a, l field delay circuit, the output signal of the field delay circuit 2 C becomes three successive field signals. 在下面的描述中,场延迟电路l的输出信号b被称为当前场信号;场信号a是当前场信号b之后的场信号,被称为后一场信号; 场信号c是当前场信号b之前的场信号,并被称为前一场信号。 In the following description, the field delay circuit output signal b l is referred to as the current field signal; field signal is a signal field following the current field signal b, a signal known as post; field signal c is the current field signal b previous field signal, and is called before a signal. 该2-2下变换检测装置10通过对当前场信号b、后一场信号a和前一场信号c中包含的多个像素的像素值进行比较,来判断输入信号是否为下变换信号。 Comparing the change detection means 2-2 at 10 by a plurality of pixel values ​​of pixels of the current field signal B, after a previous field and a signal included in the signal c, determines whether the input signal is down-converted signal. 如果输入信号是下变换信号,则该2-2下变换检测装置10 向场选择器3提供场选择信号,以便标明用于对缺少行进行内插值的场。 If the input signal is down-converted signal, the 2-2 pull-field detection means 10 provides the field selection signal selector 3, for a field to indicate the lack of the interpolated rows. 该场选择信号是这样的信号,该信号用于指出如下的场信号是后一场信号a还是前一场信号c,所述场信号是通过2-2下变换处理与当前场信号b—样从同一帧生成的场信号。 The field selection signal is such a signal used to indicate the following field signal is a signal after a previous field or a signal C, b- the field signal by the 2-2 conversion process and the current field signal samples generated from the same frame of the field signal. 该2-2下变换检测装置10还将下变换检测信号输出到输出选择器5,从而根据输入场信号是否为2-2下变换信号来改变对缺少行进行内插值的方式。 The 2-2 pull down conversion detecting means 10 also outputs a detection signal to the output selector 5, so that in accordance with the input field signal is a 2-2 pull down signal to change the way of the interpolated missing rows. 下面将对该2-2下变换检测装置10的结构和该2-2下变换检测装置10的判断操作进行详细说明。 The following operation is determined at the change detection means 2-2 and the lower structure 10 2-2 change detection device 10 will be described in detail. 场选择器3根据2-2下变换检测装置10输出的场选择信号,提供后一场信号a或前一场信号c作为内插值信号d。 Field selector 3 selects signal 10 outputted from the field detection means 2-2 pull down, providing a signal after a previous field or a signal c as the interpolated signal d. 逐行滤波器4接收当前场信号b、后一场信号a和前一场信号c,从而检测图像中的变化。 Progressive filter 4 receives the current field signal b, and a signal after a previous field signal c, thereby detecting a change in the image. 如果检测到图像中存在变化,则该逐行滤波器4 稂据当前场信号b的像素通过场内内插值生成内插值行。 If there is a change in the image is detected, the progressive grass filter 4 according to the current field signal b by interpolation pixel row inner field generating interpolation. 相反,如果没有检测到图像中存在变化,则它根据当前场信号b的像素和后一场信号a的像素通过场间内插值生成内插值行。 Conversely, if there is a change is not detected in the image, it generates the interpolation line by the inter-field interpolation according to the pixel of the current field and pixel signal b after a signal a. 该逐行滤波器4将所生成的内插值行作为内插值信号e提供给输出选择器5。 The progressive filter 4 the generated interpolated line is supplied to the output selector 5 as the interpolated signal e. 该输出选择器5接收从2-2下变换检测装置10输出的下变换检测信号。 The selector 5 receives the output of the change detection signal outputted from the change detection apparatus 10 2-2. 在该下变换检测中,输出选择器5选择从场选择器3输出的内插值信号d,并将其作为内插值行信号输出到上扫描转换器6。 Detecting the down-conversion, the output selector 5 selects the output signal d from the interpolated field selector 3, and outputs a signal as to the interpolated scanning line converter 6. 相反,在没有下变换检测的情况下,输出选择器5选择从逐行滤波器4输出的内插值信号e,并将其输出到上扫描转换器6。 In contrast, in the absence of the change detection output from the selector 5 selects the interpolation signal output from the row e 4 filter, and outputs it to the scan converter 6. 该上扫描转换器6对当前场信号b和输出选择器5输出的内插值行信号进行倍速转换,并将经过该倍速转换之后的当前场信号b和内插值行信号合并从而以60帧/秒输出帧信号。 The scan converter 6 the current field interpolated line signal and the output signal b outputted from the selector 5 to double speed conversion, and after double speed conversion of the current field interpolated signal b and the signal line so as to merge 60 frames / sec an output frame signal. 下文中将参照图2至9描述本实施例的2-2下变换检测装置10的结构和操作。 Hereinafter described with reference to Figs 2-2 pull down detection apparatus 10 according to the present embodiment has a structure and operation. 图2示出2-2下变换检测装置10的结构。 FIG 2 shows the structure of the change detection device 10. 2-2. 该2-2下变换检测装置10包括输入信号处理器ll、像素比较器12、场比较器13和下变换判断器14。 The 2-2 pull down signal detection apparatus 10 includes an input processor ll, pixel comparator 12, comparator 13 and the field conversion determiner 14. 下面将参照图4的流程图来描述该2-2下变换检测装置10的全部操作。 The 2-2 pull will be described the overall operation detecting means 10 with reference to the flowchart of FIG. 首先,在步骤S111中,输入信号处理器ll接收三个连续场信号a、 b、c,并输出将由像素比较器12所使用的多个信号以便对像素值h—t叩l、 h_tap2、 h—tap3、 v—tap、 vt—tap和tjap中的变化进行检测。 First, in step S111, the input signal processor ll signal receives three successive fields a, b, c, and outputs signals by a plurality of pixel comparators for l h-t rapping pixel value of 12 is used, h_tap2, h -tap3, v-tap, vt-tap and detecting changes in tjap. 然后,在步骤S112中,像素比较器12利用从输入信号处理器11输出的多个信号来判断每个像素在当前场b和后一场a之间是否相似。 Then, in step S112, the comparator 12 using the pixel signals outputted from the plurality of input signal processor 11 determines for each pixel in a current field and b are similar between the a. 以及当对一个场的处理结束时,场比较器13根据一个场的汇集结果来判断图像在当前场b和后一场a之间是否相似(步骤S114和S115)。 And when the processing is ended for one field, the field of the comparator 13 together to determine the results of a field image are similar between the current field and after a b a (steps S114 and S115). 在步骤S116中,下变换判断器14从场比较器13接收判断结果并检测该判断结果是否表示下变换信号具有规律性。 In step S116, the change determination unit 14 receives the judgment result from the comparator 13 and the detection field of the determination result indicating whether the converted signal having regularity. 如果下变换判断器" 检测到下变换信号的规律性,则它将下变换检测信号输出到输出选择器5并将场选择信号输出到场选择器3 (步骤S117和S118)。另一方面, 如果下变换判断器14没有检测到下变换信号的规律性或如果下变换信号的规律性被破坏了,则它不将下变换检测信号输出到输出选择器5 (步骤S119).在步骤S120中,下变换判断器14根据场比较器13中的判断结果历史,判断是否改变像素比较器12和场比较器13的阈值。当满足阈值变化条件时,下变换判断器14改变像素比较器12和场比较器13的阈值或改变它们中的任意一个的阈值。下面将详细描述图2所示的2-2下变换检测装置10的各部件。[输入信号处理器ll]输入信号处理器ll接收三个连续的场信号a、 b和c,并输出多个信号,所输出的这些信号用于在像素比较器12中检测像素值的变化。具体的,它向像素比较器12输 If the conversion is determined "on the regularity of the detected signal is converted, it will change detection signal to the output selector 5 outputs the scene field selection signal and selector 3 (step S117 and S118). On the other hand, if Analyzing the conversion unit 14 does not detect if the regularity of the regular or the transformed signal down-converted signal is destroyed, it does not output the detection signal converted into the output selector 5 (step S119). in step S120, the change determination unit 1412 and the field threshold of the comparator according field comparator 13 the determination result history, determines whether to change the pixel comparator 13 when the threshold variation condition is satisfied, the change determination unit 14 changes the pixel comparator 12 and field threshold comparator 13 is changed or any one of them is a threshold value below the respective components 2-2 of the change detection apparatus 10 shown in FIG. 2 described in detail. [input signal processor ll] ll receives three input signal processor consecutive field signals a, b and C, and outputs a plurality of signals which are output for detecting a change in the pixel values ​​of the pixels of the comparator 12. specifically, it is output to the pixel comparator 12 以下信号:h—tapl、 h—tap2和h—tap3,用于检测水平方向上的像素值变化;v一tap,用于检测垂直方向上的像素值变化;vt一tap,用于检测垂直时域方向上的像素值变化;以及tjap, 用于检测时域方向上的像素值变化。,以下参考图3A和3B说明h—tap、 v—tap、 vtjap和t—tap的定义。h—tap 包含在水平方向上相邻的三个像素的像素值,这三个像素是在相同行上的三个连续像素。如图3A所示,如果用于内插值的行是v,贝ijh一tapl 包含行vl中包括的三个像素bll, bl2和bl3的像素值,该行vl是当前场信号b中紧接着内插值行v的前一行。hjap3包含行v+l中包括的三个像素b31, b32和b33的像素值,该行v+l是当前场信号b中紧接着内插值行v的后一行。hjap2包含三个像素a21、 a22和a23的像素值,这三个像素包括在后一场信号a的内插值行v中。 Following signals: h-tapl, h-tap2 and h-tap3, a pixel value variation in the horizontal direction is detected; V a tap, for detecting a pixel value variation in the vertical direction; VT a tap, for detecting when the vertical the pixel value variation in the domain direction; and tjap, a pixel value variation in the time domain direction is detected, below with reference to FIGS. 3A and 3B illustrate h-tap, v-tap, vtjap and t-tap definition .h-tap. including the pixel values ​​of three pixels adjacent in the horizontal direction and three pixels in the three consecutive pixels of the same row. As shown, if the line is interpolated values ​​for v, a shell ijh 3A tapl bll comprising three rows of pixels included vl, bl3 BL2 and the pixel value of the current field line vl signal b is interpolated line immediately preceding line .hjap3 v v + l lines that included three pixels b31 , and the pixel value B32 b33, which row is v + l b of the current field signal interpolated line immediately after the line v .hjap2 comprising three pixels A21, a22 and a23 of the pixel value, the pixel is included in the three an interpolated line signal a in v.

v—tap包含多个像素的像素值,这些像素相邻地位于当前场信号b 中将被内插值的像素的上面和下面。 v-tap comprising a plurality of pixel values, the neighboring pixels located above and below in the current field signal b being interpolated pixel. 例如,如果将被内插值的像素为图3B中所示的b22,则v—tap包含bU和b3^勺像素值。 For example, if a pixel to be interpolated to b22 illustrated in Figure 3B, the v-tap comprising bU spoon and b3 ^ pixel values.

vt—tap包含多个像素的像素值,这些像素是:相邻地位于当前场信号b中将被内插值的像素的上面和下面的像素;以及后一场信号a中与将 vt-tap comprising a plurality of pixel values, the pixels are: adjacently located above and below in the current field to be interpolated signal b of the pixel; and after a signal a and the

被内插值的像素具有相同坐标的像素。 The interpolated pixel of the pixel having the same coordinates. 例如,如果将被内插值的像素为图3B中所示的b22,则vt—t叩包含bl2、 b32和a22的像素值。 For example, if a pixel to be interpolated to b22 illustrated in Figure 3B, the pixel comprising rapping vt-t values ​​bl2, b32 and a22 of.

t—tap包含后一场信号a和前一场信号c中与当前场信号b中将被内 After t-tap containing a previous field and a signal with the signal c in the current field is the signal b

插值的像素位于相同坐标的多个像素的像素值。 The pixel values ​​of the pixels of the interpolation pixel in the same coordinates. 例如,如果将被内插值的像素为图3B中所示的b22 ,则t—tap包含aM和c22的像素值。 For example, if a pixel to be interpolated to b22 illustrated in Figure 3B, it contains the t-tap and the pixel value c22 of aM.

图5示出该输入信号处理器11的结构例子。 FIG. 5 shows a configuration example of the input signal processor 11. 行延迟电路511是将输入信号延迟一行的存储器(水平扫描周期)。 Line delay circuit 511 is a line memory delaying the input signal (horizontal scanning period). 点延迟电路512至518是将输入信号延迟一个点周期的存储器。 Dot delay circuits 512 to 518 delay the input signal is a memory cycle point. 行延迟电路511和点延迟电路512至518的组合可以生成h一tapl、 h一tap2、 h一tap3、 v—tap、 vt一tap禾口t一tap。 Combination of line delay circuit 511 and delay circuits 512 to 518 points can generate a h tapl, h a tap2, h a tap3, v-tap, vt t a tap opening a tap Wo.

[像素比较器12] [Pixel comparator 12]

该像素比较器12利用h—tapl、 h_tap2、 h—tap3、 v_tap、 vt—tap禾口t—tap, 以像素为单位判断多个图像在当前场b和后一场a之间是否相似。 The pixel comparator 12 using h-tapl, h_tap2, h-tap3, v_tap, vt-tap opening Wo t-tap, determining a plurality of pixels in the image, and after a current field b are similar between a. 水平像素比较器121至123利用h—tapl、 hjap2和h—tap3检测多个图像在水平方向上是否存在变化。 The horizontal pixel using the comparator 121 to 123 h-tapl, hjap2 and h-tap3 detects whether a plurality of images there is a change in the horizontal direction. 垂直像素比较器124利用v一tap检测多个图像在垂直方向上是否存在变化。 Vertical pixel comparator 124 detects tap using a plurality of images v whether there is a change in the vertical direction. 垂直和时域像素比较器125利用vt—tap来检测多个图像在当前场b和后一场a之间是否存在变化。 Vertical and temporal pixel comparator 125 vt-tap using a plurality of images to detect whether there is a change between the current field and after a b a. 时域像素比较器126利用tjap来检测多个图像在前一场c和后一场a之间是否存在变化。 Temporal pixel comparator 126 detects a plurality of images of a front and a rear c if there is a change between a use tjap.

当针对后一场a的像素a21时,图像变化检测器127根据水平像素比较器121至123、垂直像素比较器124、垂直和时域像素比较器125以及时域像素比较器126的检测结果,判断图像在当前场b和后一场a之间是否相似。 When a post for a pixel a21, the image detector 127 changes the horizontal pixel comparators 121-123, comparator 124 vertical pixels, vertical and temporal pixel comparator 125 and the time domain pixel comparator 126 of the detection result, determining whether the similarity between the current image field and after a b a.

传统的下变换检测装置,例如图18A中所示的2-2下变换检测装置卯,通过将相应于vt—tap和v—tap的像素进行比较来检测图像中的变化。 Under traditional change detection means, for example, 2-2 pull down detection apparatus shown in FIG. 18A sockets, to detect a change in the image by comparing the corresponding vt-tap and v-tap pixel. 另一方面,除了利用vt—tap和v—tap来进行比较和判断以外,本实施例的2-2下变换检测装置10还利用h—tapl、 h一tap2和h—tap3进行水平比较和判断,利用t—tap来进行时域比较和判断。 On the other hand, in addition to comparison and judgment by using vt-tap and v-tap outside, the change detection apparatus 2-2 according to the present embodiment also uses the 10 h-tapl, h a and h-tap3 tap2 horizontal comparison and judgment to time-domain comparison and judgment by using t-tap.

如果像素值在水平方向上变化很大,则意味着显示图像包括例如斜线和物体边界的高频部分(下称为边缘部分)。 If the pixel value variation in the horizontal direction is large, it means that, for example, includes a display image and a high-frequency portion shaded object boundary (referred to as the lower edge portion). 在这种边缘部分中, 边缘部分也可能存在在垂直方向上。 In this edge portion, the edge portion may also be present in the vertical direction. 在这种情况下,由于存在该边缘部分而导致像素值发生变化,因此在传统的下变换检测装置中对vt—tap 的判断极有可能会错误地判断图像发生了变化,但实际上在当前场和后一场之间并没有发生图像变化。 In this case, the presence of the edge portion caused by change in the pixel value, and therefore the conversion in the conventional detection apparatus is determined for vt-tap is very likely to be erroneously determines whether the image has changed, but in fact the current the image has not changed between the field and the game.

由于本实施例中的2 — 2下变换检测装置10利用h—tap进行水平方向上的比较和判断,因此可以从经过判断的多个像素中排除那些像素值在水平方向上变化很大的像素。 Since the embodiment 2 - 10 for 2 change detection means for comparison and judgment by using the horizontal direction h-tap, it is possible to exclude the pixel values ​​in the horizontal direction changes greatly from the plurality of pixels through the pixel is determined in . 从而避免由于存在边缘部分而导致的错误判断,并提高对图像变化判断的准确度。 Thereby preventing erroneous determination caused by the presence of the edge portion, and to improve the accuracy of determination of image change. 另外,本实施例的2 — 2下变换检测装置10利用t—tap进行时域方向上的判断。 Further, the present embodiment is 2 - 10 for 2 change detection means for determining the use of t-tap in the time domain direction. 利用t—tap进行判断的优点如下。 Advantage of using t-tap judged as follows.

在后一场a和当前场b之间像素值变化极大的像素中,g卩,时域变化很大的像素中,当利用vt一tap进行的判断来检测像素值中的变化时, 不能确定该变化是由于在场之间的图像变化而导致的,还是由于高频图像的边缘部分而导致的。 After a match between the current field and the pixel value variation maximum b pixels, g Jie, a large temporal change in pixels, when using a tap of a judgment vt detects the change in pixel value, can not be the change is determined between an image change due to the result of the presence of, or due to an edge portion of the high-frequency images resulting. 如果在图像变化的判断中加入这样的像素, 那么即使后一场a和当前场b都是从相同帧中生成的,也很可能发生图像变化的错误判断。 If the addition of such a pixel is determined change in the image, even if the current field and a field b is generated from the same frame, it is likely erroneous determination of an image change occurs.

由于本实施例的2 — 2下变换检测装置10利用t—tap进行时域比较和判断,因此可以从所判断的多个像素中排除那些像素值在时域方向上变化极大的像素。 Since the present embodiment 2 - t-tap time-domain comparison and judgment by the change detection means 10 using 2, a plurality of pixels can be excluded from the determination of those pixels greatly the pixel value variation in the time domain direction. 从而可能避免对具有很大时域变化的图像作出错误判断,并提高图像变化判断的准确度。 Thereby making it possible to avoid misjudgment of the image has a lot of domain changes, and improve the accuracy of image change judgment.

同时,如果像素值在后一场a和前一场c之间的变化很小,即当图像时域变化很小时,可以假设在后一场a和当前场b之间的像素值变化也很小。 Meanwhile, if the pixel value after a change between a previous field and c is small, i.e., when the image is small temporal variations, it may be assumed pixel value variation between the current field and a field b is also small. 如果在图像变化的判断中加入这样的像素,则即使后一场a和当前场b是从不同帧中生成的,场比较器13也很难判断这些图像是否相似。 If the addition of such a pixel is determined change in the image, even after a current field a and b are generated from different frames, the field comparator 13 is also difficult to determine whether the images are similar.

为了克服上述缺陷,本实施例的2 — 2下变换检测装置10可以从多个图像之间的相似性判断中排除图像时域变化较小的那些像素。 To overcome the above defects, the present embodiment is 2 - 10 for 2 change detection means can exclude those pixels of the image is small temporal variations is determined from the similarity between a plurality of images. 因此可以提高场比较器13判断图像是否相似的准确度。 Field can be improved comparator 13 determines whether the images are similar accuracy. 这样,即使在由于垂直高频图像导致的图像变化很小的情况下,这种排除也可以避免利用vt—tap错误地作出认为存在图像变化的判断,从而提高了判断图像是否相似的准确度。 Thus, even in a small image change caused due to the vertical high-frequency image, the use of such exclusion is avoided vt-tap erroneously judge that there is a change in the image, thereby improving image determining whether similar accuracy.

图6示出像素比较器12的结构例子。 6 illustrates an example of a pixel structure 12 of the comparator. HPF611 — 614是对三个输入信号进行(.-1,2,-1) /2计算的滤波器。 HPF611 - 614 is a three input signals (-1,2., -1) filter / 2 calculated. 减法器621和622输出两个输入信号之间的差。 Subtractors 621 and 622 output difference between the two input signals. ABS 631至636输出输入信号的绝对值。 ABS is an absolute value of an input signal output 631-636. 阈值比较器641—646对分别由ABS 631至636输出的信号进行阈值判断,并当判断结果为真则输出"1",而当判断结果为假,则输出"0"。 641-646 of the threshold comparator, respectively, by a signal output from the ABS 631 to 636 threshold determination, and the determination result is true when the outputs "1", and when the determination result is false, outputs "0."

如果hjapl在水平方向上像素值变化很小,且阈值比较器641的输入信号小于阈值Thrl,则对h一tapl进行阈值判断的阈值比较器641输出"1"。 If hjapl pixel value in the horizontal direction changes little, and the threshold comparator input signal 641 is less than the threshold thrL, h is to be tapl a threshold comparator 641 outputs a threshold judgment value of "1." 相反,如果h—tapl在水平方向上像素值变化很大,且阈值比较器641的输入信号大于阈值Thrl,则阈值比较器641输出"0"。 Conversely, if the h-tapl large pixel value variation in the horizontal direction, and the threshold comparator input signal is greater than a threshold value thrL 641, the threshold comparator 641 outputs "0." 阈值比较器642和643分别对h—tap2和hjap3的操作与上述相同。 Threshold comparator 642 and 643, respectively, and the operation of the h-tap2 hjap3 the same as described above. 这些判断操作可以从判断对象中排除在水平方向上像素值变化很大的那些像素。 Analyzing these operations may be excluded from the determination target pixel value varies greatly those pixels in the horizontal direction.

如果v—tap在垂直方向上像素值变化很小,且阈值比较器644的输入信号小于阈值Thr4,则阈值比较器644输出"1";如果v—tap在垂直方向上像素值变化很大,且阈值比较器644的输入信号大于阈值Thr4,则阈值比较器644输出"0"。 If the v-tap in the vertical direction of the pixel value change is small, and the threshold comparator input signal 644 is less than the threshold value Thr4, the threshold comparator 644 outputs "1"; if the v-tap large pixel value variation in the vertical direction, and the threshold comparator input signal 644 is greater than the threshold value Thr4, the threshold comparator 644 outputs "0."

如果后一场信号a的像素a22的像素值和当前场b的像素bl2和b32的像素值之间的差别很大,且阈值比较器645的输入信号大于阈值Thr5,则阈值比较器645输出"1"。 If the large difference between the pixel values ​​of a signal a pixel value a22 and the current field b pixel bl2, and b32, and the threshold comparator input signal 645 is greater than the threshold Thr5, the threshold comparator 645 outputs " 1". 相反,如果像素a22的像素值和像素b12和b32的像素值之间的差别很小,且阈值比较器645的输入信号小于阈值Thr5,则阈值比较器645输出"0"。 In contrast, the difference between the pixel values ​​of pixels b12 and if the pixel b32 and a22 and a pixel value is small, and the threshold comparator input signal 645 is less than the threshold Thr5, the threshold comparator 645 outputs "0."

如果t—tap在时域方向上像素变化很小,且阈值比较器646的输入信号小于阈值Thr6,则阈值比较器646输出"1"。 If the t-tap in the time domain direction, pixel variation is small, and the threshold comparator input signal 646 is less than the threshold Thr6, the threshold comparator 646 outputs "1." 如果t—tap在时域方向上像素变化很大,且阈值比较器646的输入信号大于阈值Thr6,则阈值比较器646输出"0"。 If the t-tap pixels greatly vary in the time domain direction, and the threshold comparator input signal 646 is greater than the threshold Thr6, the threshold comparator 646 outputs "0." 这些判断操作可以从图像变化的判断中排除图像时域变化很大的那些像素。 These operations may be determined to exclude the image domain changes greatly from those pixels of the image change is determined.

在图6中,图像变化检测器127由"与"门电路65构成,该"与"门电路65对阈值比较器641 — 646输出的二进制信号进行逻辑"与"计算。 In FIG. 6, the image detector 127 changes from "and" gate 65 constitutes the "and" gate circuit 65 the threshold value comparator 641-- logical "and" 646 calculates the binary signal output. 当阈值比较器641 — 646中的判断结果均为真时,该"与"门电路65输出"1"作为像素判断信号。 When the threshold comparator 641 - to determine the result 646 are true, the "and" gate 65 outputs "1" as a pixel determination signal.

虽然图6示出了结构例子,它设置了阈值从而使阈值比较器646从判断结果中排除了一些t—tap在时域方向上像素变化很大的像素,但是本发明并不局限于此。 While FIG. 6 illustrates an example of a configuration, which sets the threshold value so that the threshold comparator 646 to exclude a large number of t-tap pixel variation in the time domain in a direction from the determination result, the present invention is not limited thereto. 为了从图像变化的判断结果中排除那些时域图像变化很小的像素,则当阈值比较器646的输入信号等于或大于阈值Thr6时,阈值比较器646可以输出"1"。 In order to exclude those with little temporal change in image pixels from the image change in the result of determination, when the input signal of threshold comparator 646 is equal to or greater than the threshold Thr6, the threshold comparator 646 may output "1." 另外,为了在图像变化的判断 Further, in order to change the image determination

中同时排除时域变化极大的像素和时域图像变化很小的像素,该阈值比较器646可以具有两个阈值。 While excluding the extremely variable small time-domain and time-domain pixel image change pixels, the threshold comparator 646 may have two threshold values.

[场比较器13] [Field comparator 13]

场比较器13以场为单位对像素比较器12中的判断结果进行汇集,并根据各场中的汇集结果判断当前场b和后一场a中的变化。 Field comparator 13 in field units for the pixel comparator 12 aggregates the determination result, and determines the current change in a field after a and b in accordance with the results pooled in each field. 该场比较器13包括多个计数器,它将屏幕分为多个区域,并按照各划分区域对像素比较器12中的判断结果进行汇集。 The comparator 13 comprises a plurality of the field counter, will screen is divided into a plurality of regions, and on the result of the determination pixel aggregates the comparator 12 according to each divided area.

计数器部分132包括多个计数器。 Counter section 132 includes a plurality of counters. 为屏幕的每个划分区域分配一个计数器。 A counter assigned to each divided region of the screen. 区域选择器131接收从图像比较器12输出的像素判断信号,并根据像素坐标选择计数器部分132中的计数器并输出。 Region selector 131 receives pixel determination signal output from the image comparator 12, and selected according to the pixel coordinates of the counter section 132 and outputs the counter. 由此可以按照各划分区域将像素比较器12的判断结果整合(integrate)在一起。 Whereby each divided area according to the determination result of the integration of pixel comparator 12 (integrate) together.

场变化判断器133根据计数器部分132中各划分区域的整合结果,判断图像在当前场b和后一场a之间是否相似。 The field change determiner 133 of the integrated results of each divided area counter section 132 determines whether the image in the current field, and after a b are similar between a. 具体来说,它选择一个用于在各场间判断图像变化的划分区域,对所选择的划分区域的图像变化进行判断,如果以像素为单位整合多个结果的整合值超过了预定的阈值,则判断这些像素不相似。 Specifically, it selects a divided region for each field is determined between an image change of image change of the selected divided region is determined, if a plurality of pixels, the integration result of the integration value exceeds the predetermined threshold value, it is judged not similar pixels. 可选地,也可以判断像素变化的整合值是否超过了每个划分区域的阈值,如果在任何区域中像素变化的整合值超过了预定阈值,则判断这些图像不相似。 Alternatively, it may be determined whether the integrated value of the pixel change exceeds a threshold for each divided area, if the integrated value of the pixel changes in any area exceeds a predetermined threshold value, it is determined that the images are not similar. 200610009418.4 200,610,009,418.4

传统的下变换检测装置,例如图18A所示的2 —2下变换检测装置90,通过将整个屏幕中的像素变化的判断结果进行整合来判断是否存在图像变化。 Change detection means in the conventional example of FIG. 18A at 2-2 change detection device shown in FIG. 90, to determine whether there is an image change determination result of the integration by the pixel changes in the entire screen. 但是,对整个屏幕中的像素变化的判断结果进行整合存在一个问题,即整合值在整个屏幕中被平均化。 However, the determination result changes pixel across the screen will be a problem in the integration, i.e. integration values ​​are averaged in the entire screen.

例如,由于该传统下变换检测装置根据整个屏幕的整合结果来判断是否存在图像变化,并且由此整个屏幕中的整合值被平均化了,从而如果图像仅在屏幕的一小部分中有运动部分,则因此该传统的下变换装置会错误地判断不存在图像变化。 For example, since the conventional device of the change detection result of the integration of the entire screen to determine whether there is an image change, and thereby the integration value of the entire screen are averaged, so that if there is only moving part in the image of a small portion of the screen , so that the conventional down-conversion apparatus erroneously determined absence of image change. 而另一方面,本实施例的2 — 2下变换检测装置针对每个划分区域来判断像素变化的整合值是否超过了阈值,并当任何划分区域中的整合值超过阈值时,可检测出图像的变化。 On the other hand, the present embodiment 2 - the change detection means 2 for each divided region to determine whether the integration value of the pixel change exceeds a threshold, and when the integrated value of any divided area exceeds a threshold, the image can be detected The change. 从而可以避免由于图像的主要区域中没有变化而导致错误判断。 Which avoids the major area of ​​the image did not change lead to misinterpretation.

在包含高频成分的图像中的一个区域中,由于存在边缘部分,很可能导致像素比较器12对图像变化作出错误的判断。 In a region of the image contains high frequency components, since the presence of the edge portion is likely to result in a pixel comparator 12 make a wrong judgment on the image change. 因此,如果在图像的主要区域中存在包含高频成分的区域,则传统的下变换检测装置将根据包含大量错误判断的整个场的整合值来判断是否在各场间存在图像变化。 Thus, if there is a region including high-frequency components in the main area of ​​the image, the conventional down-conversion in accordance with the detecting means comprising a large number of integrated value of the entire field of erroneous determination to determine whether there is an image change between each field. 因此,即使没有图像变化,传统的下变换检测装置也会错误地判断存在图像变化。 Accordingly, even if there is no change in the image, the conventional apparatus will erroneously change detection is determined there is an image change. 另一方面,本实施例的2 — 2下变换检测装置10从对图像变化的判断中排除了计数器部分132中具有很大整合值的计数器,并将其他计数器的整合值与预定阈值进行比较,从而通过排除了包含由于存在边缘部分而导致错误判断的区域而对图像变化进行判断。 On the other hand, Example 2 - 2 and the change detection apparatus 10 excludes the counter counter portion 132 has a large integrated value is determined from the change in the image, and the integrated value of the other counter is compared with a predetermined threshold value, so that by excluding the presence of the edge portions comprising region cause an erroneous determination and the determination of image change. 因此可以避免由于存在边缘部分而导致的像素比较器12的错误# U断对场间图像变化的判断产生影响。 It can be avoided by the presence of an edge portion caused by pixel comparison error # U 12 determines the breaking effect on the inter-field image change.

优选地,在像素比较器12中根据利用h—tap在水平方向上的判断和利用t—tap在时域方向上的判断,在场比较器13中进行计数器部分132的选择操作。 Preferably, the presence of the comparator 13 is selected in accordance with operation of the counter section 132 using h-tap in the horizontal direction is determined and the determination using t-tap in the time domain direction in the pixel comparator 12. 例如,如果像素比较器12按照图6中的结构例子配置为通过对t—tap的判断,从判断对象中排除在时域方向上像素值变化很大的那说明书第17/26页 For example, if the comparator 12 is configured in accordance with the pixel configuration example in FIG. 6 through determination of t-tap, the pixel value varies greatly excluded that the description on page 17/26 in the time domain direction is determined from the object

些像素,,则优选地配置场比较器13的结构以便从对图像变化的判断中排除计数器部分132中具有大整合值的计数器。 These are preferably arranged in the pixel field ,, the comparator structure 13 so as to exclude from the determination of an image change in the counter portion having a counter 132 in a large integrated value. 该结构可以根据时域方 The time-domain structure can be square

向上像素变化不是很大的区域中的整合结果来判断当前场b和后一场a之间是否存在变化,其中所述区域是像素比较器12中不太可能发生错误判断的区域。 Up integration result is not large pixel variation region to determine whether there is a change between the current field and a b a, wherein the region is a pixel region of the comparator is less erroneous determination may occur 12. 因此可能提高场比较器13中判断场变化的准确性。 It may improve the accuracy of determination of the field change in the field 13 of the comparator.

图7示出了场比较器13的结构例子。 FIG. 7 shows an example of the structure of the field 13 of the comparator. 图7示出了将图像区域水平分割为三个区域的情况。 FIG. 7 shows a case where the image region is divided horizontally into three areas. 计数器部分132包括L计数器711,用于对在图像左侧区域中像素上的像素比较器12的判断结果进行汇集;M计数器712,用于对在图像中间区域中的判断结果进行汇集;和R计数器713,用于对在图像右侧区域中的判断结果进行汇集。 L counter 132 includes a counter section 711, for determination in the left area image pixel comparison on the pooled results of 12 pixels; M counter 712, is determined for the image region of the intermediate results together; and R a counter 713, determines the image for the right area of ​​the pooled results.

图7示出了这样的情况,g卩,场变化判断器133排除了计数器部分132中整合值很大的区域,并根据其他区域中的整合值检测图像中的变化。 Figure 7 shows such a case, g Jie, field variation determiner 133 excluding large areas of the integrated value of the counter section 132, and the integration value detected by the change in the image in the other region. L/M/R最小值选择器72从L计数器711、 M计数器712和R计数器713的整合值中选出最小值。 L / M / R selector 72 to select the minimum value from the minimum value 711, the counter integration value L M counter 712 and R counter 713. 阈值比较器73将该L/M/R最小值选择器72所选择的最小值与预定阈值Thr7进行比较。 The minimum threshold value with a predetermined threshold comparator 73 the L / M / R selector 72 to the selected minimum value is compared Thr7. 如果与阈值Thr7的比较满足最小值〉Thr7的关系式,则判断这些图像不相似,并向下变换判断器14输出"1"。 If compared with the threshold minimum value satisfying> Thr7 Thr7 the relationship, it is determined that the images are not similar, and change determination unit 14 outputs "1". 另一方面,如果比较结果满足最小值〈Thr7的关系式,则判断这些图像相似,并且向下变换判断器14输出"0"。 On the other hand, if the comparison result satisfies the relationship minimum <Thr7, it is determined which images are similar, and down-conversion determiner 14 outputs "0." 该场判断信号是提供给下变换判断器14的1位信号。 The field determination signal is supplied to a down-converted signal 14 is determined.

图7示出一个结构,其排除了计数器部分132中整合值很大的区域。 Figure 7 shows a structure that excludes large area integrated value of the counter section 132. 为了排除计数器部分132中整合值较小的区域,场变化判断器133可以 In order to exclude the counter portion 132 of a smaller area integrated value, the field 133 may change determiner

选择具有很大整合值的计数器。 Select the counter consolidation has great value.

另外,为了针对各划分区域来判断像素变化中的整合值是否超过了阈值,可以排除该L/M/R最小值选择器72,且阈值比较器73可以对所有计数器进行阈值比较。 Further, in order for each divided area to determine whether the integration value of the pixel change exceeds the threshold value, may exclude the L / M / R minimum value selector 72, and the threshold comparator 73 may compare the threshold values ​​for all the counters. [下变换判断器14] [Determines the conversion 14]

该下变换判断器14接收由场比较器13提供的场判断信号,并判断其是否具有2 — 2下变换信号的规律性。 The down conversion determiner 14 receives the field by the field determination signal provided by the comparator 13, and determines whether or not having 2 - regularity of the converted signal. 具体来说,如果输入的场判断信号在每个场中具有1和0交替重复的模式,例如"1010…"或"0101…",则下变换判断器14判断存在2 — 2下变换信号的规律。 Specifically, if the input signal having a determination field and a 0 in the pattern are alternately repeated in each field, such as "1010 ..." or "0101 ...", then the conversion determiner 14 determines the presence of 2 - 2 down-converted signal law. 另一方面,如果缺少场判断信号的重复形式,则下变换判断器14判断不存在2 —2下变换信号的规律。 On the other hand, the absence of a field determination signal repetitive form, the determiner 14 determines the conversion rule of converting the signal 2-2 does not exist.

另外,如果下变换判断器14检测到该下变换信号的规律性,则它通过判断当前正在处理的当前场信号b是否与后一场信号a或前一场信号c相似,以便向输出选择器5提供下变换检测信号,并向场选择器3提供场信号。 Further, if the change determination unit 14 detects the regularity of the transformed signal, determining if it is currently being processed by the current field signal b is similar whether a previous field or a signal after the signal c and to output to the selector providing the change detection signal 5, and 3 provide a field selector signal field. 该场选择信号用于将后一场信号a或前一场信号c表示为用于生成内插值行的场。 The field selection signal after a signal for a previous field or a signal c indicates field interpolation for generating the row. 具体来说,如果紧接着的前一场判断信号的判断结果为"1",则当前场信号b和后一场信号a是由同一帧所生成的,并且,由于根据该下变换信号的规律性,当前正在处理的场信号的判断结果被假设为"0",因此设置场选择信号以标示后一场信号a。 Specifically, if the determination result of the immediately previous field determination signal is "1", the current field signal b, and a signal after a frame is generated by the same, and, since the law according to which the converted signal resistance, the determination result signal in the current field being processed is assumed to be "0", the field selection signal is provided to a signal labeled a. 相反,如果紧接着的前一场判断信号的判断结果为"0",则当前场信号b和后一场信号a是由不同帧所生成的,并且,由于根据下变换信号的规律性,当前正在处理的场信号的判断结果被假设为"1",因此设置场选择信号以标示前一场信号c。 Conversely, if the determination result of the immediately previous field determination signal is "0", the current field and the signal b is a signal after a frame generated by different, and, since the regularity of the transformed signal, the current field determination result signal being processed is assumed to be "1", the field selection signal is provided to indicate a previous field signal c.

相反,如果下变换判断器14没有检测到下变换信号的规律性,或该下变换规律性被破坏,则它不向输出选择器5输出下变换检测信号。 Conversely, if the change determination unit 14 does not detect the regularity of the transformed signal, down-conversion or the regularity is broken, it does not transform the detector output signal at the output selector 5.

另外,该下变换判断器14还判断是否需要根据上述下变换判断的判断结果的历史来改变像素比较器12和场比较器13的阈值。 Further, the down conversion determiner 14 further determines whether the pixel to change the threshold comparator 12 and comparator 13 in the field according to the historical result of the determination of the conversion is determined. 当满足改变阈值的条件时,下变换判断器14将改变像素比较器12和场比较器13的阈值,或改变它们其中一个的阈值。 When changing the threshold condition is satisfied, the change determination unit 14 changes the pixel threshold comparator 12 and the comparator 13 of the field, or a change thereof wherein the threshold.

在传统的例如图18A所示的2-2下变换检测装置90的下变换检测装置中,用于判断图像变化的阈值是固定的。 In the conventional example, the change detection means detecting the 2-2 converting means 90 shown in FIG. 18A, a threshold value for determining image change is fixed. 如果用于该判断的阈值是固定的,那么即使当图像类型截然不同,例如完全静态图像和剧烈运动图像时,也将使用相同的阈值来进行判断。 If the threshold value for the determination is fixed, then even when different picture types, for example fully static image and a moving image vigorous, will use the same threshold value is determined. 因此,如果所设置的阈值不适用于输入的场信号,它将导致尽管确实是下变换信号但却不能检测到下变换这样的状态的延续,以及由于没有检测到输入的场信号不是下变换信号而导致将其检测为下变换这样的状态的延续。 Therefore, if the set threshold value of the input signal for the field does not apply, although it does result in the converted signal is detected but not such a conversion state continuation, and the field is not detected because the input signal is not down converted signal resulting in the conversion to be detected as a continuation of such a state. 它还导致在下变换检测和未检测到之间存在不规则变动。 It also results in variation between the presence of irregularities detected and undetected downconversion. 这些情况的存在将使帧图像质量在IP转换之后变得恶化。 The existence of these situations will frame the image quality to worsen after IP conversion.

另一方面,本实施例的2-2下变换检测装置10通过动态地设置用于 On the other hand, the 2-2 conversion detection apparatus 10 according to the present embodiment is provided for by dynamically

图像变化判断的阈值,来防止上述问题状态的延续。 Image change determination threshold value, to prevent the continuation of the state of the above problems.

图8示出了下变换判断器14的结构例子。 FIG 8 shows an example of the conversion structure 14 is determined. 移位寄存器81通过在每个场中进行一次移位操作,来接收场比较器13提供的场判断信号并累计该信号,从而保留了场判断的历史。 The shift register 81 by performing a shift operation in each field, the field is determined by the received signal field and the comparator 13 provides the total signal, so as to preserve the history of the field judgment. 虽然图8示出的例子中移位寄存器81的阶数是10,但是它并不局限于此。 Although the example order shown in FIG. 8 of the shift register 81 is 10, but it is not limited thereto. 由于如果移位寄存器81的阶数较小时很容易发生下变换检测和未检测到之间的不规则变动,因此检测准确性将随着阶数的增加而增加。 If due to the order of the shift register 81 is small and irregular change detection does not detect the variation between, the detection accuracy will increase as the increase of the order easily occur. 但是,如果移位寄存器81的阶数很大时,由于在检测出下变换之前需要更多数量的场,因此进入下变换检测状态的延时也变长了。 However, if the order of the shift register 81 is large, due to the need of a greater number field is detected before the conversion, so the state of the entry delay change detection also becomes longer. 实际的阶数的数目应当被确定为这些互相冲突因素的折衷方案,通常应当为4阶到10阶。 The actual number of the order to be determined as a compromise between these conflicting elements with each other, should generally be 10 to fourth-order order.

模式判断器82获取存储在移位寄存器81中的值,并判断它是否与下变换模式"1010..."或"0101..."相匹配。 Mode determining unit 82 acquires the value stored in the shift register 81, and it determines whether the conversion pattern "1010 ..." or "0101 ..." match. 如果它与该下变换模式匹配,则该模式判断器82向输出选择器5提供下变换检测信号,并向场选择器3提供场选择信号。 Change detection signal if it matches with the down conversion mode, the mode judgment unit 82 provides the output selector 5, the field selector 3 to provide a field selection signal. 如果它与该下变换模式不匹配,则该模式判断器82不向输出选择器输出下变换检测信号。 If it does not match the down conversion mode, the mode judgment unit 82 without converting the detection signal to output the output selector.

下变换检测信号历史存储器83存储该下变换检测信号的历史。 The change detection signal history memory 83 stores the history of the change detection signal. 阈值设置部分84判断是否改变阈值,所述阈值是由像素比较器12中阈值比较器641至646以及场比较器13中的阈值比较器73所使用的,以及, 如果判断需要改变这些阈值,则输出阈值设置信号1和阈值设置信号2。 A threshold value setting section 84 determines whether to change the threshold value, the threshold value is a pixel comparator 12 threshold comparators 641 to 646 and a field comparator 13 the threshold comparator 73 is used, and, if it is determined necessary to change the threshold value, an output of the threshold setting signal set signal and the threshold 2. 优选在以下情况下改变阈值,(1)没有检测到下变换的状态持续较长时间;(2)检测到下变换的状态持续较长时间;以及(3)在下变换检测和未检测到的状态之间频繁变化。 Preferably changes the threshold value in the following cases, (1) does not detect the state of transform longer duration; (2) converting the detected state continues for a long time; and (3) down-conversion and the detection state is not detected frequent changes between.

(1) 如果没有检测到下变换的状态持续了较长时间,则逐步改变该阈值从而放宽下变换检测的条件。 (1) If the state is not detected continues for a longer conversion time, thereby gradually changing the threshold value to relax the conditions under change detection. 如果下变换检测信号的历史持续指示"0"且图像匹配状态持续,则改变阈值从而使得更容易地检测到图像变化。 If the history of continuous change detection signal indicates "0" and the image matching state is continued, the threshold value is changed, making it easier to detect changes in the image. 例如可以作出以下改变,例如逐步减小阈值比较器72的阈值Thr7,分别逐步增加阈值比较器641至643的阈值Thrl至3,诸如此类。 For example, the following changes may be made, for example, gradually reducing the threshold comparator 72 the threshold value Thr7, respectively, gradually increase the threshold comparator threshold value Thrl 641-643 to 3, and the like. 相反,如果下变换检测信号的历史持续指示"1"且图像变化状态持续, 则可以改变阈值从而使检测到图像变化变得更难。 Conversely, if the history of the change detection signal is continuously indicative of "1" and the image change state continues, the threshold may be changed so that the detected image change becomes more difficult.

如果输入信号为下变换信号,则该信号被检测到且利用从场选择器3输出的内插值信号进行IP转换,从而在不使图像质量恶化的情况下生成帧图像。 If the input signal is down-converted signal, the signal is detected and converted using the IP interpolated signal outputted from the selector field, so that the case without deterioration of image quality frame image is generated. 本实施例的2-2下变换检测装置10改变阈值,从而放宽下变换检测的条件,最终提高了下变换状态的检测准确性。 2-2 10 changes the threshold value change detection device according to the present embodiment, change detection so as to relax the conditions under ultimately improve the detection accuracy of the transformed state.

(2) 如果检测到下变换的状态持续较长时间,则逐步改变阈值从而使下变换检测的条件更为严格。 (2) if the detected state of transform for a longer time, and gradually changing the threshold so that the condition change detection under more stringent. 例如可以作出以下改变,例如逐步减小阈值比较器72的阈值Thr7。 For example, the following changes may be made, for example, gradually reducing the threshold comparator 72. The threshold value Thr7. 将不是下变换信号的图像错误地检测为下变换信号将导致图像质量严重恶化,例如上扫描转换器6输出的帧图像中的梳状噪声。 The down-converted image signal is not erroneously detected as the converted signal to cause serious deterioration of the image quality, for example, a frame image output from the scan converter 6 in comb noise. 本实施例的2-2下变换检测装置10通过使其容易地脱离下变换状态从而防止所述的严重的图像质量恶化。 2-2 pull down detection apparatus 10 of the present embodiment by making it easy to transform the disengaged state so as to prevent the serious deterioration of image quality.

(3) 如果在下变换检测和未检测到的状态之间频繁变化,则将阈值临时改变为不检测下变换的值。 (3) If the change detection frequent changes between the lower and undetected state, the temporarily changed threshold value is converted without detection. 如果在下变换检测和未检测到的状态之间频繁变化,则上扫描转换器6输出的帧图像将在以下两种帧图像之间变化,所述的两种帧图像是:利用场选择器3输出的内插值信号进行IP转换之后的帧图像,和利用由逐行滤波器4生成的内插值信号进行IP转换后的帧图像。 If frequent changes between the lower and change detection state is not detected, the frame image is output on a scan converter 6 will vary between two image frames, said two frame image is: using a field selector 3 the interpolation signal outputted from the frame image after IP conversion, and using the interpolation signal generated by the filter 4 performs frame progressive image after IP conversion. 由于这两个帧图像具有不同的分辨率,因此频繁变换将导致图像质量恶化,例如显示图像的闪变。 Since these two frame images having a different resolution, converting the thus frequently cause deterioration of image quality, such as display flicker of the image. 本实施例2-2下变换检测装置10通过改变阈值来防止由于在下变换检测和未检测到的状态之间频繁变化而导致图像质量的恶化。 By changing the threshold value to prevent deterioration in the image quality due to the frequent changes between the lower and does not detect the change detection result of the state change detection means 102-2 under the embodiment of the present embodiment.

下文中将参照图9的流程图来描述阈值设置部分84中的阈值设置操作。 Threshold setting operation threshold setting section 84 of the flow chart will hereinafter be described with reference to FIG. 首先,在步骤S211中,阈值设置部分84察看下变换检测信号的历史。 First, in step S211, the threshold setting section 84 change detection signal in the history view. 如果在步骤S212中检测到在下变换检测和未检测到的状态之间的频繁变化,则在步骤S213中迅速将该阈值改变为很难检测到下变换的阈值。 If the detected change in frequency between the lower and change detection state is not detected in step S212, the threshold value is rapidly changed to the threshold value is difficult to detect the down-converted in step S213. 然后,如果在步骤S214中持续检测到下变换检测状态,则在步骤S215中逐步改变阈值,从而使该下变换检测更难。 Then, if in step S214 the continuously detected state change detection, the threshold value is changed stepwise in the step S215, so that the next change detection more difficult. 如果在步骤S216 中持续检测到下变换未检测的状态,则在步骤S217中改变阈值从而使得下变换检测更容易。 If in step S216 is continuously detected state of transform undetected, then change the threshold in step S217 so that the conversion is more easily detected.

本实施例中的像素比较器利用h—tapl 、 h—tap2和h—tap3进行水平像素比较,以及利用tjap来进行时域像素比较,利用v—tap来进行垂直像素比较,并利用vt—tap来进行垂直和时域像素比较。 In this embodiment a pixel comparator using h-tapl, h-tap2 and h-tap3 horizontal pixel comparison, and the use tjap to temporal pixel comparison, using a v-tap to vertical pixel comparison, using vt-tap to vertical and temporal pixel comparison. 但是,也可以选择这些像素比较中的一些。 However, you can also choose some of these pixel comparisons. 例如,可以进行hjapl、 h—tap2和hjap3以及v—tap和vt—tap的比较,t—tap、 v—tap禾卩vt—tap的比较,以及h—tap2、 t—tap、 v—tap禾口vt—tap的比较。 For example, may be hjapl, h-tap2 and hjap3 and Comparative v-tap and vt-tap of, t-tap, Comparative v-tap Wo Jie vt-tap, and h-tap2, t-tap, v-tap Wo Compare the mouth vt-tap.

第二实施例 Second embodiment

图10示出了根据本发明第二实施例的逐行转换装置200,该装置包括2-2下变换检测装置20。 Figure 10 shows the progressive conversion apparatus according to a second embodiment 200 of the present invention, the apparatus includes a change detection means 20 at 2-2. 该2-2下变换检测装置20利用图3所示的比较像素v—tap、 vt_tap、 h—tapl、 hjapS和hJapS来判断输入信号是否为下变换信号。 The 2-2 pull down detection apparatus 20 using FIG comparison pixel shown v-tap 3, vt_tap, h-tapl, hjapS hJapS and determines whether the input signal is a signal converted. 本实施例中的2-2下变换检测装置20与第一实施例中的2-2下变换检测装置10的不同之处在于,它不利用t一tap进行时域像素比较。 2-2 pull down detection apparatus 20 in the present embodiment is different from the 2-2 pull down detection apparatus 10 of the first embodiment, it does not compare t using a time domain tap pixel. 如果输入场信号为下变换信号,则如2-2下变换检测装置10—样,该2-2 下变换检测装置20向场选择器3提供场选择信号,从而指定用于对缺少行进行内插值的场。 If the input field signal is down-converted signal, such as the 10- comp change detection means 2-2, 2-2 the lower field change detection means 20 to the selector 3 provides field selection signal, to specify for the lack of line field interpolation. 该场选择信号是这样的信号:该信号用于指出如下的场是否为后一场信号a和前一场信号c,该场是通过2-2下变换处理、 来自与当前场信号b相同帧而生成的。 The field selection signal is a signal: This signal is used to indicate whether the following field signal after a previous field and a signal C, of ​​the field by the 2-2 conversion processing, the signal b from the current field of the same frame It generated. 另外,该2-2下变换检测装置20 向输出选择器5提供下变换检测信号,从而根据输入场信号是否为2-2 下变换信号而改变对缺少行进行内插值的方式。 In addition, the lower 2-2 change detection means 20 provided to the output selector 5 change detection signal in a manner to vary the lack rows interpolated field based on the input signal is a 2-2 pull signal.

在逐行转换装置200中,除了2-2下变换检测装置20之外的其他部件都与上述第一实施例中逐行转换装置100的相应部件具有相同的功能。 In the progressive conversion apparatus 200, in addition to other components than the 2-2 pull down detection apparatus 20 have the same function as the corresponding components of the above-described first embodiment, the progressive conversion apparatus 100. 因此它们具有相同的附图标记,并且省略了对它们的详细描述。 They have the same reference numerals, and detailed description is omitted thereof.

图ll示出该2-2下变换检测装置20的结构。 Ll FIG 2-2 shows the structure of the lower change detection device 20. 输入信号处理器21接收两个连续场信号a和b并输出由像素比较器22所使用的信号。 Input signal processor 21 receives two successive fields a and b signals and outputs the pixel signal by the comparator 22 is used. 具体来说, 它向像素比较器22提供用于在水平方向上检测像素值变化的h—tapl、 h—tap2和h—tap3信号;用于在垂直方向上检测像素值变化的v—tap信号; 以及用于在垂直和时域方向上检测像素值变化的vt一tap信号。 Specifically, it provides the pixel 22 h-tapl comparator for detecting a change in pixel value in the horizontal direction, h-tap2 and h-tap3 signal; a v-tap pixel value variation detection signal in the vertical direction ; vt a tap and a signal for detecting a change in pixel value in the vertical direction and the time domain.

图12示出该输入信号处理器21的具体结构的例子。 FIG 12 shows an example of the specific structure of the input signal processor 21. 与第一实施例的2-2下变换检测装置10的像素比较器ll相似,它可以通过行延迟电路511和点延迟电路512、 513、 515至518的组合来生成hjapl、 h—tap2、 h—tap3 、 v—tap禾口vt—tap 。 2-2 is similar to the change detection device of the first embodiment of a pixel comparator ll 10, which can delay circuit 512 and delay circuit 511 by line points, 513, 515-518 composition generates hjapl, h-tap2, h -tap3, v-tap of Hekou vt-tap.

像素比较器22利用由输入信号处理器21提供的h—tapl、 h—tap2、 h—tap3、 v—tap和vt一tap,以像素为单位判断图像在当前场b和后一场a之间是否相似。 Is determined between the image in the current field pixel b, and a comparator after a 22 h-tapl use provided by the input signal processor 21, h-tap2, h-tap3, v-tap vt and a tap, in pixels are similar.

水平像素比较器121至123、垂直像素比较器124以及垂直和时域像素比较器125的功能和操作都与2-2下变换检测装置10中的像素比较器12相同。 To 123 are the same level comparator 121 pixel vertical pixel comparator 124 and a time domain and the vertical pixel comparison function and operation of the pixel 125 of the comparator 10 under the 2-2 converting means 12 is detected. 具体来说,水平像素比较器121至123利用h—tapl、 h—tap2和h—tap3来检测图像在水平方向上是否存在变化。 Specifically, the horizontal pixel using the comparators 121 to 123 h-tapl, h-tap2 and h-tap3 to detect whether or not there is a change in the image horizontal direction. 垂直像素比较器124利用vjap来检测图像当前场b中在垂直方向上是否存在变化。 Vertical pixel comparator 124 detects the image using the current field vjap b whether there is a change in the vertical direction. 垂直和时域像素比较器125利用vt一tap来检测图像在当前场b和后一场a之间是否存在变化。 Vertical and temporal pixel comparator 125 using a tap vt detects whether there is a change in the image between the current field and after a b a.

当针对后一场a的像素a21时,图像变化检测器127根据水平像素比较器121至123、垂直像素比较器124、以及垂直和时域像素比较器125 的检测结果,判断图像在当前场b和后一场a之间是否相似。 When a post for a pixel a21, the image detector 127 changes the horizontal pixel comparators 121 to 123, the detection result of the vertical pixel comparator 124, and a time domain and the vertical pixel comparator 125, the current field is determined in accordance with the image b and after a similarity between whether a.

图13示出了像素比较器22的结构的例子。 FIG 13 shows an example of a pixel structure of a comparator 22. 其中HPF611至614、减法器621、ABS631至635和阈值比较器641至645都与图6所示的像素比较器中的相应部件相同。 Wherein HPF611 to 614, a subtractor 621, ABS631 to threshold comparator 635, and 641 to 645 are the same as the corresponding components in the pixel comparator shown in FIG. 6. 在图13中,图像变化检测器127由"与"门电路65构成,该"与"门电路65对从阈值判断器641 — 646输出的二进制信号进行逻辑"与"计算。 In Figure 13, image change detector 127 consists of "and" gate 65, the "and" gate circuit 65 from the threshold determination 641 - Binary logic signal output 646 "and" computing. 当阈值判断器641 — 646中的判断结果均为真时,该"与"门电路65输出"1"作为像素判断信号。 When the threshold is determined 641 - When the determination result 646 are true, the "and" gate 65 outputs "1" as a pixel determination signal.

图11所示的2-2下变换检测装置20中的场比较器13和下变换判断器14的功能和操作与第一实施例的2-2下变换检测装置10中的相应部件相似。 10 is similar to corresponding parts in FIG. 11 2-2 under field change detection means 20 in the comparator means detecting 2-2 pull down conversion shown in FIG. 13 and 14 determines the function and operation of the first embodiment. 因此它们具有相同的附图标记,并省略了对它们的详细描述。 They have the same reference numerals, and the detailed description thereof is omitted thereof.

如上所述,本实施例中的2-2下变换检测装置20除了利用vt—tap和v—tap进行比较和判断外,还利用h—tapl至h—tap3进行水平方向上的比较和判断。 As described above, in the embodiment 2-2 of the change detection device 20 according to the present embodiment in addition to comparison and judgment by using vt-tap and v-tap, but also to the use of h-tapl h-tap3 compared and determined in the horizontal direction. 由于本实施例的2-2下变换检测装置20利用h—tap进行水平比较和判断,因此它可以从判断对象中排除像素值在水平方向上变化很大的那些像素。 2-2 since the change detection device 20 according to the present embodiment using the h-tap horizontal comparison and judgment, it can greatly change the pixel values ​​of those pixels in the horizontal direction is excluded from the determination object. 因此通过防止由于显示图像中存在边缘部分而导致的错误判断,从而可以提高图像变化的判断准确性。 Therefore, by preventing erroneous determination due to the presence of the edge portion of the display image caused, which can improve the accuracy of the determination of image change.

第三实施例 Third Example

图14示出了根据本发明第三实施例的逐行转换装置300,该装置包括2-2下变换检测装置30。 Figure 14 shows the progressive conversion apparatus 300 according to a third embodiment of the present invention, the apparatus includes a change detection means 30 at 2-2. 该2-2下变换检测装置30利用图3所示的比较像素v—tap、 vt—tap和t—tap来判断输入信号是否为下变换信号。 The 2-2 pull down detection apparatus 30 using FIG comparison pixel v-tap, vt-tap and t-tap shown in FIG. 3 determines whether the input signal is down-converted signal. 本实施例中的2-2下变换检测装置30与第一实施例中的2-2下变换检测装置10的不同之处在于,它不利用h一t叩l至3进行水平像素比较。 Examples 2-2 change detection at 2-2 change detection means 30 in the first embodiment of the apparatus of the present embodiment differs from the embodiment 10 in that it does not utilize t h a knock level l 3 to pixel comparison. 如果输入场信 If the input field letter

号为下变换信号,贝ij如2-2下变换检测装置10—样,2-2下变换检测装置30向场选择器3提供场选择信号,从而指定要对缺少行进行内插值的场。 Number next converted signal, 10- ij as the shell-like change detection means 2-2, 2-2 pull down detection device field 30 to provide a field selector 3 selects signal to specify the line to be interpolated missing field. 该场选择信号表明如下的场是后一场信号a还是前一场信号c:该场是来自与当前场信号b相同的场而通过2-2下变换处理生成的。 The field selection signal indicates that the following signal field after a field or a previous field signal c: This field is a current field of the same field from the signal b through the 2-2 conversion process is generated. 另外,该2-2下变换检测装置30向输出选择器5提供下变换检测信号,从而根据输入场信号是否为2-2下变换信号来改变对缺少行进行内插值的方式。 In addition, the lower 2-2 converting means 30 detecting the change detection signal provided at the output selector 5, thereby changing the way missing rows interpolated field based on the input signal is a 2-2 pull signal.

在逐行转换装置300中,除了该2-2下变换检测装置30之外的其他部件都与上述第一实施例中逐行转换装置100的相应部件具有相同的功能。 In the progressive conversion apparatus 300, in addition to the 2-2 pull down detection apparatus 30 than the other components have the same function as the above-described first embodiment, the corresponding components of apparatus 100 progressive conversion. 因此它们具有相同的附图标记,并省略了对它们的详细描述。 They have the same reference numerals, and the detailed description thereof is omitted thereof.

图15示出了2-2下变换检测装置30的结构。 FIG 15 shows a configuration change detection device 30. 2-2. 输入信号处理器31接收三个连续场信号a、 b和c并输出在像素比较器32中使用的信号。 Input signal processor 31 receives three consecutive signals a, b and c, and the output signal of the comparator 32 in the pixel. 具体来说,它向像素比较器32提供用于在垂直方向上检测像素值变化的v—tap 信号、用于在垂直和时域方向上检测像素值变化的vt—tap信号、和用于在时域方向上检测像素值变化的t—tap信号。 In particular, it provides for the v-tap pixel value signal for detecting a change in the vertical direction, vt-tap signal for detecting a change in pixel value in the vertical direction and the time domain to the pixel comparator 32, and for t-tap pixel value variation detection signal of the time domain direction.

图16示出输入信号比较器31的具体结构例子。 FIG 16 shows a specific configuration example of the input signal of the comparator 31. 与第一实施例的2-2 下变换检测装置10的像素比较器11相似,它可以通过行延迟电路511将输入信号b延迟一行来生成v—tap、 vt一tap和t—tap。 11 is similar to the 2-2 pull down detection apparatus of the first embodiment of a pixel comparator 10, which can be input circuit 511 generates a signal delayed by one line b v-tap, vt t-tap and a tap via line delay.

像素比较器32利用由输入信号处理器31提供的v—t叩、vt—tap和t一tap,以像素为单位判断图像在当前场b和后一场a之间是否相似。 Vt pixel comparator 32 using the signal provided by the input processor 31 knock, vt-tap t and a tap, in pixels is determined in a current image field and b are similar between the a.

垂直像素比较器124、垂直和时域像素比较器125以及时域像素比较器126的功能和操作都与2-2下变换检测装置10中的像素比较器12的那些相应部件相似。 Vertical pixel comparator 124, and time-domain vertical pixel comparator 125 and the time domain function and operation of a pixel comparator 126 are similar to those corresponding parts in the 2-2 converting means 10 is detecting a pixel comparator 12. 具体来说,垂直像素比较器124利用v一tap来检测图像当前场b中在垂直方向上是否有变化。 Specifically, comparator 124 vertical pixels v using a tap in the current field image b is detected whether there is a change in the vertical direction. 垂直和时域像素比较器125利用vt—tap来检测图像在当前场b和后一场a之间是否有变化。 Vertical and temporal pixel comparator 125 using vt-tap detects whether there is a change between the current image field and after a b a. 时域像素比较器126利用t—tap来检测图像在当前场b和后一场a之间是否有变化。 The comparator 126 compares the time-domain pixel using t-tap detects whether there is a change in the image between the current field and after a b a.

当针对后一场a的像素a21时,图像变化检测器127根据垂直像素比较器124、垂直和时域像素比较器125以及时域像素比较器126的检测结果,判断图像在当前场b和后一场a之间是否相似。 When a post for a pixel a21, the image change detector 127 based on the detection result of the vertical pixel comparator 124, and time-domain vertical pixel comparator 125 and the time domain pixel comparator 126 determines whether the image in the current field and the b whether a similarity between a.

图17示出了像素比较器32的结构例子。 FIG 17 shows an example of a pixel structure 32 of the comparator. 其中HPF 611至614、减法器621、 ABS 631至635和阈值比较器644至646都与图6所示的像素比较器中的相应部件相似。 Wherein the HPF 611 to 614, a subtracter 621, ABS 631 to threshold comparator 635 and 644-646 are similar to corresponding components of the pixel comparator 6 shown in FIG. 在图17中,图像变化检测器127由"与"门电路65构成,该"与"门电路65对从阈值判断器644 — 646输出的二进制信号进行逻辑"与"计算。 In FIG 17, the image change detector 127 consists of "and" gate 65, the "and" gate circuit 65 from the threshold determination 644 - Binary logic signal output 646 "and" computing. 当阈值判断器644 — 646中的判断结果均为真时,该"与"门电路65输出"1"作为像素判断信号。 When the threshold is determined 644 - When the determination result 646 are true, the "and" gate 65 outputs "1" as a pixel determination signal.

图15所示的2-2下变换检测装置30中的场比较器13和下变换判断器14的功能和操作与第一实施例的2-2下变换检测装置10中的相应部件相似。 10 is similar to corresponding parts in the change detection device 30 shown in FIG. 2-2 in the field 15 and the comparator 13 determines the conversion function 14 and the 2-2 pull operation detecting apparatus of the first embodiment. 因此它们具有相同的附图标记,并且省略了对它们的描述。 They have the same reference numerals, and description thereof is omitted.

如上所述,本实施例中的2-2下变换检测装置30除了利用vt—tap和v—tap进行比较和判断外,还利用t—tap进行时域方向上的比较和判断。 As described above, the change detection device 30, 2-2 in the present embodiment in addition to comparison and judgment by using vt-tap and v-tap, but also compared using a t-tap and determining the time domain direction. 由于本实施例的2-2下变换检测装置30利用tJap进行时域比较和判断, 因此它可以从判断对象中排除在后一场a和前一场c之间像素值变化很大或时域变化很大的那些像素。 2-2 since the change detection device 30 according to the present embodiment tJap using time-domain comparison and judgment, it can be excluded between a rear and a front of a large c-domain or a pixel value variation is determined from the object a lot of those pixels change.

另外,在时域变化很大的像素中,当利用vt—tap的判断检测到像素值的变化时,它不能判断该变化是由场间图像变化引起的还是由高频图像的边缘部分引起的。 Further, a large temporal change pixel, when the determination using vt-tap pixel value change is detected, it can not determine whether the change is caused by the inter-field image or a change in frequency caused by the edge portion of the image . 如果在图像变化判断中加入这样的一个像素, 那么即使当后一场a和当前场b都是由同一帧生成的,也很可能发生对图像变化的错误判断。 If the addition of such a change in the image pixel is determined, then even if the current field and a field b of the same frame are generated, erroneous determination of the likely occurrence of image change.

该2-2下变换检测装置30利用tjap进行时域比较和判断,从而从判断对象中排除了在时域方向上像素值变化很大的那些像素。 The lower detection means 30 using the 2-2 conversion tjap time-domain comparison and judgment, thereby eliminating the time domain direction of a large pixel value variation determining those pixels from the object. 从而可以防止对具有很大时域变化的图像做出错误判断,并提高了图像变化判断的准确性。 Thereby preventing incorrect judgment of the image has a lot of domain changes, and improve the image change determination accuracy.

虽然图17中示出了这样的配置的例子:该配置的例子中,设置阈 Although FIG. 17 shows an example of such configurations: the example of the configuration, the set threshold

值从而阈值比较器646可以从判断结果中排除时域像素变化t—tap较小 Value so that the threshold comparator 646 may be excluded from the determination result in the time domain t-tap pixel variation is small

的那些像素,但是本发明并不局限于此。 Those pixels, but the present invention is not limited thereto. 为了从图像变化的判断中排 In order to discharge from the determination of image change

除时域图像变化较小的像素,当阈值比较器646的输入信号等于或大于阈值Thr6时,阈值比较器646可以输出"1"。 In addition to the smaller temporal change in the pixel image, when the input signal of threshold comparator 646 is equal to or greater than the threshold value Thr6, threshold comparator 646 may output "1." 该配置可以在图像相似性判断中除去具有较小时域图像变化的像素。 This configuration can remove a small change in the pixel domain image having the image when the similarity determination. 因此,可以防止利用vt—tap 的判断结果错误地作出这样的判断:由于图像为垂直高频图像而导致虽然图像变化很小但却存在图像变化的情况,由此提高了判断图像是否相似的准确性。 Thus, it is possible to prevent erroneous make such judgments using the determination result vt-tap: a vertical high-frequency image since the image While the resulting image but there is little change in image change, thereby improving the accuracy of determining whether the images are similar sex.

另外,为了从图像变化判断中排除时域变化非常大的像素和时阈图像变化很小的像素,该阈值比较器646可以有两个阈值。 Further, a small change in time domain to a very large change in the image pixel and the threshold is excluded from the image pixel is determined change in the threshold comparator 646 may have two thresholds.

上述各实施例描述了将本发明应用于2-2下变换检测装置和检测2-2下变换信号并进行IP转换的逐行转换装置中的情况。 Each of the above described embodiments of the present invention is applied, and the detection means detects conversion 2-2 2-2 pull signal where progressive conversion means and converting the IP. 本发明还可应用于2-3下变换检测装置和按照与2-2下变换检测装置相同的方式检测2-3下变换信号并进行IP转换的逐行转换装置。 The present invention is also applicable to the change detection means 2-3 and 2-3 P conversion means for detecting the converted signal in accordance with the same change detection means 2-2 manner and the IP conversion.

很明显本发明并不局限于上述各实施例,本领域技术人员在不背离本发明保护范围和精神的情况下可以对它们进行修改和变化。 Obviously the present invention is not limited to the above embodiments, those skilled in the art without departing from the modifications and variations can be made which case the scope and spirit of the invention.

Claims (13)

1.一种下变换检测装置,用于检测输入视频信号是否由下变换处理而生成,该装置包括: 像素比较器,至少进行下述比较:在所述输入视频信号中包含的第一场和在所述第一场之前一场的第二场之间进行像素比较,以及在所述第一场和所述第二场的至少之一中进行水平像素比较,从而判断在所述第一场和所述第二场之间是否存在像素变化; 场比较器,用于汇集像素比较器中的判断结果,以及根据像素比较器的判断结果来判断在所述第一场和所述第二场之间是否存在图像变化;以及下变换判断器,用于根据场比较器中的判断结果来判断所述输入视频信号是否是由下变换处理而生成的。 A lower change detection means for detecting whether an input video signal generated by the conversion process, the apparatus comprising: a pixel comparator for comparing at least the following: contained in the input video signal in the first field and performed between a first field of the field before the second pixel comparison, and comparing horizontal pixels in the first field and the second field of the at least one, to determine said first field whether there is a change between the pixel and the second field; field comparator for collecting the judgment result in the comparator pixel, and a pixel is determined according to comparison result of the determination in the first field and second field whether there is a change between the image; and a lower conversion determiner configured to determine based on the result of the field comparator whether the input video signal generated by the conversion process.
2. 根据权利要求l的下变换检测装置,其中所述像素比较器将第一场中包含的第一像素与第二场中包含的第二像素进行比较,所述第二像素与第一像素相邻并位于所述第一像素的上方或下方,该像素比较器还将所述第一像素与第三像素进行比较,该第三像素与第一像素水平相邻。 2. The following change detection apparatus according to claim l, wherein said first pixel of the second pixel to pixel comparison is the first field comprises a second field contained in the comparing first pixel and the second pixel positioned adjacent to and above or below the first pixel, the pixel comparator also compares the first pixel and the third pixel, the third pixel adjacent to the first pixel level.
3. 根据权利要求2的下变换检测装置,其中所述像素比较器测量所述第一像素和所述第三像素之间像素值的差值,如果所述差值超过预定的阈值,则从存在像素变化的判断中排除所述第一像素。 The next change detection apparatus as claimed in claim 2, wherein a difference in pixel value between the pixel of the third pixel measurement pixel and the first comparator, if the difference exceeds a predetermined threshold value, from determining the presence of a change in pixel excluding the first pixel.
4. 根据权利要求l的下变换检测装置,其中所述像素比较器还将在所述第一场和所述第一场之前两场的那个场之间的、位于相同坐标的各像素进行比较,从而判断在所述第一场和所述第二场之间是否存在像素变化。 4. converting each pixel of the detection apparatus according to claim l, wherein said pixel comparator is also in the field between the first field and the first field of the previous two, at the same coordinates are compared , to determine whether there is a change between the pixels of the first field and the second field.
5. 根据权利要求l的下变换检测装置,其中,通过根据像素在场中的位置而将像素比较器中判断的在所述第一场和所述第二场之间存在差异的像素划分到多个计数器,所述场比较器对像素比较器中判断的在所述第一场和所述第二场之间存在差异的像素的数目进行汇集, 并且如果在多个计数器中汇集的像素的数目的最小值超过了预定的阈值,则判断在所述第一场和所述第二场之间存在图像变化。 5. The next change detection apparatus according to claim l, wherein, by the field according to the pixel position of the pixel in the comparator determines the division between the first field and the second field pixel differences to a plurality of counter, said comparator field there is a difference between the number of the first field and the second field pixel comparator determines a pixel may be accumulated, and if the number in the collection of pixels in the plurality of counters the minimum value that exceeds a predetermined threshold value, it is judged that there is image change between the first field and the second field.
6. —种下变换检测方法,用于检测视频信号是否是由下变换处理所生成的,所述方法包括:测量在视频信号中包含的第一场和位于所述第一场之前一场的第二场之间的像素差值,并将该差值与第一阈值相比较;水平地测量第一场和第二场的至少之一中的像素的差值,并将该差值与第二阈值相比较;根据第一阈值和第二阈值的比较结果来判断所述第一场和所述第二场之间是否存在像素变化;根据是否存在像素变化的判断结果来判断在所述第一场和所述第二场之间是否存在图像变化;以及根据是否存在图像变化的判断结果来判断该视频信号是否是由下变换处理所生成的。 6. - The method planted change detection method for detecting whether a video signal is generated by the conversion processing comprising: a measurement contained in the video signal of the first field and located before a first field a pixel difference value between the second field, and the difference is compared with a first threshold value; measured level difference between the first and second fields of the pixels in at least one of the first and the difference comparing the second threshold value; result of the comparison to determine a first threshold and the second threshold value between the first field and the second field whether there is a change pixel; judged according to the judgment result whether there is a change in said second pixels whether there is an image change between the field and the second field; and a judgment result judged according to whether there is an image change in the video signal if the conversion process is generated.
7. 根据权利要求6的下变换检测方法,还包括将在第一场和在所述第一场之前两场的那个场之间的、位于相同坐标的各像素进行比较, 并且判断在所述第一场和所述第二场之间是否存在像素变化。 7. The next change detection method according to claim 6, further comprising a comparison between the first field and two fields before the first field, and each pixel in the same coordinates, and determines the whether there is a change between the pixels of the first field and second field.
8. —种下变换检测装置,用于检测输入视频信号是否是由下变换处理所生成的,所述装置包括:像素比较器,至少进行下述比较:在输入视频信号中包含的第一场和位于第一场之前一场的第二场之间进行像素比较,以及在所述第一场和所述第一场之前两场的第三场之间进行像素比较,从而判断在所述第一场和所述第二场之间是否存在像素变化;场比较器,用于汇集像素比较器中的判断结果,以及根据像素比较器中的判断结果来判断在所述第一场和所述第二场之间是否存在图像变化;以及下变换判断器,用于根据所述场比较器中的判断结果来判断该输入视频信号是否是由下变换处理所生成的。 8. - the kind of change detection means for detecting whether input video signal is generated by the conversion process, the apparatus comprising: a pixel comparator for comparing at least the following: a first field contained in the input video signal positioned between the second field and the first field before a comparison pixel, and a pixel comparison between the first field and a third field two fields before the first field, the first to determine whether there is a change between a pixel and the second field; field comparator, for determining whether results are summarized pixel comparators, and the pixel is determined based on the result of said comparators in said first field and whether there is an image change between the second field; and a lower conversion determiner configured to determine based on the determination result of the comparator in the field of the input video signal is converted by the process is generated.
9. 根据权利要求8的下变换检测装置,其中所述像素比较器对第一场中包含的第一像素与第二场中包含的第二像素进行比较,所述第二像素与所述第一像素相邻并位于第一像素的上方或下方,以及进一步将所述第一像素与第三像素进行比较,所述第三像素包含在第三场中并位于与第一像素相同的坐标。 9. Under change detection device according to claim 8, wherein said pixel comparator is a second pixel of the first pixel comprising a first field and a second field contained in the comparing, the second pixel and the first a pixel adjacent to and located above or below the first pixel, and further the first pixel with a third pixel, the third pixel comprises a third field and located at the same coordinates of the first pixel.
10. 根据权利要求9的下变换检测装置,其中所述像素比较器测量所述第一像素和所述第三像素之间的像素值的差值,若所述差值超过预定的阈值,则从存在像素变化的判断中排除所述第一像素。 10. The next change detection device according to claim 9, the difference between the pixel values ​​wherein said pixel comparator measuring the first pixel and the third pixel, if the difference exceeds a predetermined threshold value, Analyzing the changes in the presence of a pixel excluding the first pixel.
11. 根据权利要求9的下变换检测装置,其中所述像素比较器还将第一像素和与第一像素水平相邻的另一像素进行比较,从而判断在所述第一场和所述第二场之间是否存在像素变化。 11. Next change detection device according to claim 9, wherein said pixel comparator is also the first pixel and another pixel adjacent to the first pixel level is compared to judge the first field and the second whether the pixel changes between the two games.
12. 根据权利要求8的下变换检测装置,其中,通过根据像素在场中的位置而将像素比较器中判断的在所述第一场和所述第二场之间存在差异的像素划分到多个计数器,所述场比较器对像素比较器中判断的在所述第一场和所述第二场之间存在差异的像素的数目进行汇集, 并且,如果在多个计数器中汇集的像素的数目的最小值超过了预定的阈值,则判断在第一场和第二场之间存在图像变化。 12. The next change detection means according to claim 8, wherein the multi-dividing the pixel differences between the first field and the second field according to the pixel position of the field of the determination pixel comparator counter, said comparator compares the number of pixels of the field there is a difference between the first field and the second field pixel comparator determination may be accumulated, and, if pooled pixels in the plurality of counters minimum number exceeds a predetermined threshold value, it is judged that there is image variation between the first and second fields.
13. —种下变换检测方法,用于检测视频信号是否是由下变换处理所生成的,所述方法包括:测量在视频信号中包含的第一场和位于所述第一场之前一场的第二场之间的像素差值,并将该差值与第一阈值相比较;测量在第一场和在所述第一场之前两场的第三场之间的像素差值,并将该差值与第二阈值相比较;根据第一阈值和第二阈值的比较结果来判断在第一场和第二场之间是否存在像素变化;汇集一个场的存在像素变化的判断结果,并根据所述汇集结果来判断在第一场和第二场之间是否存在图像变化;根据是否存在图像变化的判断结果来判断所述视频信号是否是由下变换处理所生成的。 13. - planted change detection method, the method detects whether the video signal is generated by the conversion processing comprises means for: measuring a video signal included in the first field and located before a first field a pixel difference value between the second field, and the difference is compared with a first threshold value; first field and measuring the difference between the third field of the first field of the previous two pixels, and the difference is compared with a second threshold; according to the comparison result of the first threshold and the second threshold value to determine whether there is a change between the first pixel and second fields; together present a change in a pixel field judgment result, and the results of the collection to determine whether there is an image change between the first and second fields; determining whether the video signal according to the determination result of whether or not there is an image change if the conversion processing is generated.
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