Realizing method of digitized processing TV interlaced scanning format conversion

Abstract

The method includes following procedures. (1) Number of lines per field from 312.5 lines are raised to 416.5 lines through technique of '4:3 line conversion based on spatial linear interpolation'. (2) Field frequency of static field is raised through technique of '6:4 field conversion based on frame replication and interpolation'. (3) Field frequency of moving field is raised through technique of '6:4 field conversion based on average interpolation between fields'. (4) Whether the present field is moving field or still field is determined through 'field movement detection'. (5) Accuracy of detecting movement of field is raised through 'robustness restriction of moving line count'. (6) Field frequency of input video is raised to 72 Hz through 'self-adapting 6:4 field conversion based on detection of field movement'. The invention possesses the features of fewer resources used, good performance, with no flicker and high visibility in vertical direction.

Description

1. Technical field [0001] The invention belongs to the technical field of VLSI design, and particularly relates to a new optimized VLSI implementation method of 50HZ / 75HZ interlaced scanning format conversion in video signal scanning and display format conversion and digital television. 2. Background technology [0002] The traditional analog TV scanning format (PAL system: 50HZ interlaced 625 lines; NTSC system: 60HZ interlaced 525 lines) has two major problems in the image display effect: (1) The flickering problem caused by the low field frequency; (2) ) The vertical resolution of the picture is not high due to the insufficient number of scanning lines in a single field. For this reason, people increase the pixel clock frequency from the original 13.5MHZ to 27MHZ in the back-end display, and improve the screen display by performing a variety of digital processing on the TV signal (interlaced to progressive, frame rate increase, image enhancement, etc.) The clarity. Most of the...

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Problems solved by technology

[0002] The traditional analog TV scanning format (PAL system: 50HZ interlaced 625 lines; NTSC system: 60HZ interlaced 525 lines) has two major problems in the image display effect: (1) The screen flickering problem caused by too low field frequency; (2) ) The vertical resolution of the picture is not high due to the insufficient number of scanning lines in a single field

However, these improved scanning formats cannot solve the above two problems at the same time. For example, in the 50HZ progressive format, the field image of 312.5 lines is reconstructed into a frame image of 625 lines. Although the vertical definition of the picture is greatly improved, the frame rate of 50HZ makes the Large-area flicker still exists; and the 100HZ interlaced format increases the field frequency from 50HZ to 100HZ, which effectively eliminates flicker between fields, but the problems of low vertical resolution and obvious line structure lines have not been resolved

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