CN2567698Y - Adaptable anti-flash filter mirror device - Google Patents

Abstract

The utility model relates to an adaptable anti-flash filter mirror device, which is applied to change the process of scanning and displaying image data in a non-interlaced scanning mode to the process of scanning and displaying the image data in a line interlace mode. The utility model comprises an edge line segment detecting device and an anti-flash filter mirror, wherein, the edge line segment detecting device receives the image data which is scanned and displayed in the non-interlaced scanning mode and sends out an effective signal according to occurrence of the edge line segment of which the length is larger than or equal to a threshold. The anti-flash filter mirror is electrically connected with the edge line segment detecting device and outputs the edge line segment which treated by the anti-flash treatment according to the effective signal.

Description

The anti-flicker of adaptive filtering lens unit

Technical field

The utility model relates to a kind of adaptive anti-flicker filter (adaptive de-flicker filter) device, refers to be applied to the image data displaying of lining by line scan especially and is converted to the anti-filtering lens unit that glimmers of adaptive in the staggered scanning image data displaying process.

Background technology

Along with the rapid progress of manufacturing technology, PC has become people's necessary product of living, and it has powerful operation capacity, and the user can utilize it to finish the function of many other electronic products.Utilizing PC to play videodiscs such as VCD, DVD is an example, but it is too small because of the PC screen size usually, cause actual inconvenience of viewing and admiring, therefore provide a TV signal output end to utilize general domestic TV to show, become the critical function of display card in the PC.

Fig. 1 (a) is the partial function block schematic diagram of a display card (display adapter), wherein graph processing chips 10 (graphic chip) is exported pixel data digital signal to a random access storage device arranged side by side digital to analog converter (Random Access Memory Digital-to-Analog Converter, be called for short RAM DAC) 11 and one television signal encoder 12 (TV encoder), and this pixel data digital signal arranged side by side is the simulating signal that can supply graphoscope 13 to show after the conversion of this random access storage device digital to analog converter 11.After the processing of this television signal encoder 12, can produce power supply as for this pixel data digital signal arranged side by side and look 14 anolog TV signals that show, and these anolog TV signals generally can be divided into NTSC and two kinds of specifications of PAL.

Fig. 1 (b) is the inner part function block schematic diagram of above-mentioned television signal encoder 12 (TV encoder), and wherein this pixel data digital signal arranged side by side is through data acquisition device (Data Capturedevice) 121, color space converter (Color Space Converter) 122, picture dimension adjustment and anti-scintillater (Scaler and Deflicker) 123,14 NTSC specifications that show or PAL specification TV signal are looked in powering of producing after the conversion of a NTSC/PAL scrambler (NTSC/PALencoder) 124 and a digital to analog converter (Digital-to-Analog Converter) 125.

Fig. 1 (c) is the existing capability block schematic diagram of above-mentioned picture dimension adjustment and anti-scintillater 123, because in the specification of NTSC specification and PAL, the horizontal scanning line quantity of each frame (Frame) has been respectively 525 and 625, neither identical with the horizontal scanning line quantity (for example 600 or 768) of common computer display frame, therefore the image data of being exported by color space converter 122 must through picture dimension adjuster 1231 be used for be adjusted to proper level sweep trace quantity, and normally utilize bilinearity algorithm (bilinear algorithm) to carry out.For example, when desire is adjusted into four sweep traces with five sweep traces, article four, the color-values of second sweep trace in the sweep trace and the 3rd sweep trace must be carried out interpolative operation according to the second sweep trace in five sweep traces, the 3rd sweep trace and the 3rd sweep trace, the 4th sweep trace, describe with the pixel shown in Fig. 2 (a), wherein P41 directly equals P51, P42 then equals 3 (P52)/4+1 (P53)/4, P43 then equals 2 (P53)/4+2 (P54)/4, then equals 1 (P54)/4+3 (P55)/4 as for P44.In addition, because TV is to utilize staggered scanning to come display frame, therefore horizontal scanning line quantity must be separated into Qi Tuchang (odd field) and the next staggered demonstration in bigraph field (even field) again through adjusted image data, therefore convert to when showing when having a horizontal former image data that a pixels tall only arranged with staggered scanning, this horizontal line just only can show in a certain figure field and produce so-called flicker (ficker) phenomenon, for eliminating this phenomenon, anti-scintillater 1232 just carries out one [1/4 with every received horizontal scanning line, 1/2,1/4] filter (filter) is handled, be that every horizontal scanning line all neighbouring calculated and is defined again through weights with itself horizontal scanning line by it, describe with the pixel shown in Fig. 2 (b), the color-values of the P2 that redefines will equal (P1)/4+ (P2)/2+ (P3)/4.So, these lines will all be revealed in two figure and eliminate scintillation.

But increasing (for example 768 along with the horizontal scanning line quantity of former computer display frame, article 864,, article 1024, even to 1200), the above-mentioned picture dimension adjuster 1231 required vertically degree of dwindling of carrying out will heighten, and when the adjusted size factor (scaling factor) less than about 0.7 the time, just may produce the situation of losing line, meaning promptly, a certain horizontal scanning line will be not by any new sweep trace institute reference that redefines, describe with the pixel shown in Fig. 2 (c), the wherein P12 P21 and the reference of P22 institute that will not be redefined, therefore the color information of P12 will be lost because of adjusted size, and, will make that image quality worsens more again through after the processing of preventing scintillater 1232.And how to improve the shortcoming of these existing means, be development fundamental purpose of the present utility model.

Summary of the invention

The utility model is the anti-flicker of an a kind of adaptive filtering lens unit, being applied to the image data displaying of lining by line scan is converted in the process of a staggered scanning image data displaying, it comprises: an edge line segment detector, receive the image data displaying of lining by line scan, it sends a useful signal according to a length more than or equal to the appearance of the edge line segment of a threshold value; And an anti-flicker filter, being electrically connected on this edge line segment detector, it carries out an anti-flicker with this edge line segment and handles back output according to this useful signal.

According to above-mentioned conception, this edge line segment detector reads in a horizontal scanning line and the adjacent level sweep trace on it in this image data displaying of lining by line scan in the anti-flicker of the adaptive of the present utility model filtering lens unit, when a pixel in this horizontal scanning line that reads in and when distance between neighbor pixel is greater than a predetermined value on it, just judge that this pixel is a marginal point, and the number that occurs continuously when the pixel that is judged as marginal point judges that just described marginal point is this edge line segment during more than or equal to this threshold value.

According to above-mentioned conception, this edge line segment detector reads in a horizontal scanning line and its following adjacent level sweep trace in this image data displaying of lining by line scan in the anti-flicker of the adaptive of the present utility model filtering lens unit, when the distance between neighbor pixel is greater than a predetermined value when a pixel in this horizontal scanning line that reads in and under it, just judge that this pixel is a marginal point, and the number that occurs continuously when the pixel that is judged as marginal point judges that just described marginal point is this edge line segment during more than or equal to this threshold value.

According to above-mentioned conception, should anti-flicker filter be that two picture element point chromatic values neighbouring with it of the pixel in this edge line segment are carried out computing and draw a linear combination value in the anti-flicker of the adaptive of the present utility model filtering lens unit, and according to the triggering of this useful signal, the coefficient of this linear combination is by [0,1,0] changes [1/4,1/2,1/4] into.

According to above-mentioned conception, the coefficient of this linear combination is to be stored in the buffer in the anti-flicker of the adaptive of the present utility model filtering lens unit.

Description of drawings

Fig. 1 (a) is the partial function block schematic diagram of a display card;

Fig. 1 (b) is the part function block schematic diagram of television signal encoder inside;

Fig. 1 (c) is the existing capability block schematic diagram of picture dimension adjustment and anti-scintillater;

Fig. 2 (a) is the synoptic diagram of bilinearity algorithm;

Fig. 2 (b) is the synoptic diagram of anti-flicker computing;

Fig. 2 (c) produces the synoptic diagram of losing line in the bilinearity algorithm;

Fig. 3 (a) is that the utility model develops the preferred embodiment function block schematic diagram that;

Fig. 3 (b) is the preferred embodiment function block schematic diagram of the utility model obfuscation filtering lens unit;

Fig. 3 (c) is the synoptic diagram that carries out the obfuscation computing in the utility model obfuscation filtering lens unit;

Fig. 4 is the function block schematic diagram of the preferred embodiment of the anti-flicker of adaptive filtering lens unit in the utility model;

Fig. 5 is the pixel synoptic diagram of horizontal scanning line in the utility model.

Embodiment

Fig. 3 (a) be the utility model the function block schematic diagram of preferred embodiment, wherein the image data displaying of being imported by color space converter 322 of lining by line scan is earlier received and handles by an obfuscation filtering lens unit (blurring filter) 323, it mainly is the color-values with each pixel in this image data displaying of lining by line scan, again a combined value that is adjacent picture element point chromatic value with this pixel is replaced, and then obtain the image data displaying of lining by line scan handled once the obfuscation filter, to be somebody's turn to do the image data displaying of handling through the obfuscation filter of lining by line scan by picture dimension adjuster 324 subsequently carries out picture dimension and readjusts, and then the effect by the anti-flicker of adaptive filtering lens unit 325, export after being converted to a staggered scanning image data displaying by follow up device more at last.

Fig. 3 (b) is the function block schematic diagram of the preferred embodiment of above-mentioned obfuscation filtering lens unit 323, it mainly is by two line buffers 3231,3232 constitute, it is respectively in order to store two horizontal scanning lines of this image data displaying of lining by line scan, and then each received bar horizontal scanning line carried out one [1/4,1/2,1/4] filter (filter) is handled (certainly, above-mentioned coefficient can change according to actual demand), be that each bar horizontal scanning line all neighbouring calculated through weights and redefines with a linear combination value with itself horizontal scanning line by it, describe with the pixel shown in Fig. 3 (c), the color-values of the P2 ' that redefines will equal (P1)/4+ (P2)/2+ (P3)/4.So, the new horizontal scanning line that produces of each bar is all mixed the color-values of neighbouring sweep trace, even therefore the vertically degree of dwindling of follow-up picture dimension adjuster 324 heightens and produces when losing the line situation, the color information of losing line still partly is stored in the neighbouring sweep trace, in order to guarantee to dwindle the image quality of back image.

When converting the staggered scanning image data displaying to, produce the phenomenon of flicker (flicker) for fear of image, still need again through anti-flicker processing through the image data displaying of lining by line scan that the obfuscation filter is handled and picture dimension is readjusted, but if handle by existing anti-scintillater, each bar horizontal scanning line all can be made once that by fuzzy image quality worsens more again, for addressing this problem, the utility model proposes the anti-flicker of adaptive filtering lens unit 325.

Fig. 4 is the preferred embodiment function block schematic diagram of the anti-flicker of adaptive filtering lens unit 325, wherein the first edge line segment detector 3251 and the second edge line segment detector 3252 read in a horizontal scanning line respectively and adjacent level sweep trace and this horizontal scanning line and adjacent level sweep trace under it on it, when a pixel in this horizontal scanning line that reads in and neighbor pixel or its when the distance between the neighbor pixel color-values is greater than a predetermined value down on it, just judge that this pixel is a marginal point, and the number that occurs continuously when the pixel that is judged as marginal point judges that just described marginal point is an edge line segment during more than or equal to a threshold value.Therefore, when this edge line segment is admitted to anti-flicker filter 3253, in order to storativity value [a0, a1, a2] buffer 3254 just by [0,1,0] will be rewritten as [1/4,1/2,1/4], handle (being about to each bar horizontal scanning line is all redefined with a linear combination value by its neighbouring calculating through weights with itself horizontal scanning line) in order to this edge line segment is carried out an anti-flicker, otherwise, when other pixel that is not judged as the edge line segment is admitted to anti-flicker filter 3253, the value of buffer then will be maintained at [0,1,0] realizes not producing the effect of effect, and then only finish at length and prevent the technological means that flicker is handled more than or equal to the edge line segment of this threshold value, as this, other can skip over this anti-flicker with regard to the pixel that scintillation can not take place originally and handle and can keep its original image quality.

Fig. 5 is the pixel synoptic diagram of above-mentioned horizontal scanning line, below equals 11 for example with regard to threshold value, and further specifying marginal point how to judge continuous appearance is the method for an edge line segment.We are provided with a width is 11 moving window (sliding window), when the pixel of moving window central authorities is a marginal point, and it is when each side 5 pixels are all marginal point, the pixel of these moving window central authorities just is confirmed as a bit in this edge line segment, and can determine further that this edge line segment has 11 pixels at least.Therefore, when among the figure the 9th o'clock when the 22nd is all marginal point, utilize above-mentioned moving window to detect after, just can determine at the 15th, 16,17 and be this edge line segment, and determine that further this edge line segment has at least 14 pixels long.

In sum; the television signal encoder of the utility model on can applying to the PC display card; the clock pulse frequency that also can be applied to external circuit is than in unsettled other the similar circuit structure of the clock pulse frequency of internal circuit; so the utility model can carry out various variations and modification easily by the those of ordinary skill in the industry, and the protection domain that does not all break away from claims and defined.

Claims (5)

1. the anti-flicker of adaptive filtering lens unit is applied to the image data displaying of lining by line scan and is converted in the process of a staggered scanning image data displaying, it is characterized in that comprising:

One edge line segment detector receives the image data displaying of lining by line scan, and it sends a useful signal according to a length more than or equal to the appearance of the edge line segment of a threshold value; And

One anti-flicker filter is electrically connected on this edge line segment detector, and it carries out an anti-flicker with this edge line segment and handle back output according to this useful signal.

2. the anti-flicker of adaptive as claimed in claim 1 filtering lens unit, it is characterized in that described edge line segment detector reads in a horizontal scanning line and the adjacent level sweep trace on it in this image data displaying of lining by line scan, when a pixel in this horizontal scanning line that reads in and when distance between neighbor pixel is greater than a predetermined value on it, just judge that this pixel is a marginal point, and the number that occurs continuously when the pixel that is judged as marginal point judges that just described marginal point is this edge line segment during more than or equal to this threshold value.

3. the anti-flicker of adaptive as claimed in claim 1 filtering lens unit, wherein this edge line segment detector is a horizontal scanning line and its following adjacent level sweep trace that reads in this image data displaying of lining by line scan, when the distance between neighbor pixel is greater than a predetermined value when a pixel in this horizontal scanning line that reads in and under it, just judge that this pixel is a marginal point, the number that occurs continuously when the pixel that is judged as marginal point judges that just described marginal point is this edge line segment during more than or equal to this threshold value.

4. the anti-flicker of adaptive as claimed in claim 1 filtering lens unit, it is characterized in that described anti-flicker filter is that two picture element point chromatic values neighbouring with it of the pixel in this edge line segment are carried out computing and draw a linear combination value, and according to the triggering of this useful signal, the coefficient of this linear combination is by [0,1,0] changes [1/4,1/2,1/4] into.

5. the anti-flicker of adaptive as claimed in claim 4 filtering lens unit, wherein the coefficient of this linear combination is to be stored in the buffer.

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