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Pull-down detection apparatus and pull-down detection method

A transformation detection and transformation processing technology, applied in the direction of standard transformation, etc., can solve problems such as low accuracy of down-converted signals

Inactive Publication Date: 2006-08-30
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] As mentioned above, the present invention has recognized that the traditional down-conversion detection device is likely to mistakenly judge an image without image change as an image with image change, so the detection of the down-conversion signal has low accuracy

Method used

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  • Pull-down detection apparatus and pull-down detection method
  • Pull-down detection apparatus and pull-down detection method
  • Pull-down detection apparatus and pull-down detection method

Examples

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no. 1 example

[0052] figure 1 The structure of the progressive conversion device 100 is shown, which includes the 2-2 down-conversion detection device 10 according to the first embodiment of the present invention. In the progressive conversion device 100, other elements except the 2-2 down-conversion detection device 10 are the same as those in the traditional progressive conversion device. The structure of the progressive conversion device 100 will be described below.

[0053] The field delay circuits 1 and 2 are memories for delaying a field signal of 60 fields / second by one field period. Since the field delay circuits 1 and 2 delay the input field signal to the progressive conversion device 100, the field signal a, the output signal b of the field delay circuit 1, and the output signal c of the field delay circuit 2 become three consecutive field signals. In the following description, the output signal b of the field delay circuit 1 is called the current field signal; the field signal ...

no. 2 example

[0124] Figure 10 A progressive conversion device 200 comprising a 2-2 down-conversion detection device 20 according to a second embodiment of the present invention is shown. The 2-2 down conversion detection means 20 uses the comparison pixels v_tap, vt_tap, h_tap1, h_tap2 and h_tap3 shown in FIG. 3 to determine whether the input signal is a down conversion signal. The difference between the 2-2 down-conversion detection device 20 in this embodiment and the 2-2 down-conversion detection device 10 in the first embodiment is that it does not use t_tap for time-domain pixel comparison. If the input field signal is a down-conversion signal, the 2-2 down-conversion detection means 20, like the 2-2 down-conversion detection means 10, provides the field selector signal to the field selector 3, thereby specifying the values ​​for interpolating the missing lines field. The field selection signal is a signal for indicating whether the following field is the next field signal a and th...

no. 3 example

[0135] Figure 14 A progressive conversion device 300 comprising a 2-2 down-conversion detection device 30 according to a third embodiment of the present invention is shown. The 2-2 down conversion detection means 30 uses the comparison pixels v_tap, vt_tap and t_tap shown in FIG. 3 to determine whether the input signal is a down conversion signal. The 2-2 pull-down detection means 30 in this embodiment differs from the 2-2 pull-down detection means 10 in the first embodiment in that it does not use h_tap1 to 3 for horizontal pixel comparison. If the input field signal is a down-conversion signal, then, like the 2-2 down-conversion detection means 10, the 2-2 down-conversion detection means 30 supplies a field selection signal to the field selector 3, thereby designating the field for which missing lines are to be interpolated. . The field selection signal indicates whether the following field signal a or the previous field signal c is generated by 2-2 down-conversion proces...

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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 field and 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 subsequent field 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 on a history of a determination result in the field comparator.

Description

technical field [0001] The invention relates to a down-conversion detection device and a down-conversion detection method, which are used for detecting whether an interlaced video signal is generated by down-conversion processing. Background technique [0002] When converting commercial film recorded at 24 frames per second to NTSC video recorded at 60 fields per second, a 2-3 pulldown process is performed, creating 5 fields from 2 frames of the original image . When converting commercial films recorded at 24 frames / sec to PAL video signals recorded at 50 fields / sec, and commercial films recorded at 30 frames / sec to NTSC video recorded at 60 fields / sec When the signal is processed, a 2-2 down-conversion process is performed, that is, 2 fields are created from 1 frame of the original image. [0003] On the other hand, when displaying an interlaced video signal, such as an NTSC signal of 60 fields / second and a PAL signal of 50 fields / second, it is necessary to perform interl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/01
Inventor 冨士和浩
Owner RENESAS ELECTRONICS CORP