A Judgment Method of Video Signal Parity Field
A technology of video signal and judgment method, which is applied to the parts of color TV, parts of TV system, TV, etc. It can solve the problems of wrong analysis sequence, inability to deduce interlaced scanning or progressive scanning, etc.
Inactive Publication Date: 2017-03-15
SHANGHAI HUAHONG INTEGRATED CIRCUIT
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0010] like Figure 5 As shown, the field synchronization is delayed for some reason so that the field synchronization signals of the odd field and the even field fall outside the effective period of the line synchronization. The current signal is a non-standard video signal. If the standard odd and even field is used to define, It will mistakenly analyze whether the sequence that appears in the field is always an even field, making it impossible to deduce whether it is interlaced scanning or progressive scanning
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0039] Such as Image 6 As shown, in a video signal, the distance between the rising edge of the field synchronization of the M+1th field and the rising edge of the line synchronization is measured to be the first displacement t2; The distance between the rising synchronous edge and the horizontal synchronous rising edge is a second displacement t1.
[0040] Comparing the measured difference between the first displacement t2 minus the second displacement t1 and the threshold 1 / 4 line distance, if the difference is greater than or equal to 1 / 4 line distance, it is determined that the field is an even field. The rising edge of the field synchronization of the M field appears outside the high level of the line synchronization, the field is an even field, and the judgment is accurate.
[0041] The present invention has been described in detail through specific implementations and examples above, but these are not intended to limit the present invention. Without departing from th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for determining an odd-even field of a video signal, and the method comprises the following steps of determining a valid border of a line synchronization signal and a valid border of a field synchronization signal according to the line synchronization signal and the field synchronization signal in the video signal; measuring a distance from the field synchronization valid border of one field relative to the line synchronization valid border to be adopted as a first displacement; measuring a distance from the field synchronization valid border of the previous field of the measured field relative to the line synchronization valid border of the previous field to be adopted as a second displacement; comparing the difference value which is obtained by subtracting the second displacement from the first displacement with a line distance, determining the field as an even field if the difference value is greater than a threshold value X, and the range of the threshold value X is more than 0 and less than half of the line distance; and determining the field as an odd field if the difference value is less than the threshold value X. The method can be suitable for a standard video signal and a nonstandard video signal, so that the accuracy and adaptability of the method for determining the odd-even field of the video signal can be improved.
Description
technical field [0001] The invention relates to the field of television video signals. Background technique [0002] In the initial stage of the development of TV technology, in order to increase the TV refresh rate without increasing the bandwidth, early TVs adopted an interlaced scanning technology, that is, the scanning lines of the TV were divided into odd lines and even lines, and only scanning was performed in odd fields. Odd lines, scan only even lines in even field. [0003] With the development of technology, a progressive scanning signal scanning mode has been produced and a new interlaced scanning mode has been developed. When the sequence of input fields is always an odd field, then the scanning mode of the current video signal is progressive scanning. When the sequence of input fields is alternating odd and even fields, then the scanning mode of the current video signal is interlaced scanning. [0004] With the digitization of video signals, in order to be co...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/04
Inventor 官志勇
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT