CN101521827B - System and method for automatically adjusting bleed suppression threshold - Google Patents

Abstract

The invention relates to a system and a method for automatically adjusting a flooding suppression threshold, which comprises a flooding suppression unit, a statistic unit and an adjustment unit, wherein the flooding suppression unit receives input image data, searches a plurality of flooding points of the input image data, judges the flooding points to be static or dynamic according to a threshold, and suppresses the static flooding points to generate output image data.

Description

System and method for automatically adjusting bleed suppression threshold

technical field

The present invention relates to an adjustment system and method, in particular to a system and method for automatically adjusting the flood suppression threshold.

Background technique

Generally, the input signal received by the display is composed of luminance and chroma. The current input signal combines luminance and chroma on a carrier wave. When the display receives the input signal, it first separates the luminance and chroma directly. and displayed on the display. However, when brightness and chroma are combined, part of the carrier wave cannot be separated due to overlapping, so the display cannot truly restore brightness and chroma, and the luminance is treated as chroma to form panchromatic (Cross- Color Artifact), thus reducing the quality of the picture displayed on the monitor and affecting the visual perception.

Before suppressing the phenomenon of bleed, the current monitor usually judges whether the bleed point of the input image data is dynamic or static, because if the dynamic bleed point is suppressed, it is easy to cause the output image to be broken or dotted (side-effect )Phenomenon. The current way of judging whether the pan-color point is dynamic or static is to determine the boundary between dynamic and static by defining a threshold, and use this threshold to compare with the pan-color point of the input image data to judge whether the pan-color point is dynamic or static. Only in this way can the pan-color point be effectively suppressed without causing other fragmentation or side-effect of the output image data. But unfortunately, often a set of thresholds cannot cope with various front-end circuits, such as digital video disc players (Digital Video DiscPlayer, DVD Player) or video decoders (Video Decoder), etc., because the above-mentioned various front-end The circuit performs other processing on the image data in order to process the needs, so that a set of thresholds preset by the bleed suppression circuit cannot be applied to different input image data, and thus the bleed phenomenon of the input image data cannot be effectively suppressed.

To sum up, in order to effectively suppress the bleed phenomenon, the bleed suppression circuit still encounters the influence of the pre-circuit processing, which leads to the fact that the previously preset or adjusted threshold of the bleed suppression circuit cannot produce the expected bleed suppression effect , so the user must readjust the threshold to suppress the flooding phenomenon of the input image data at that time, which is time-consuming and inefficient.

Therefore, the present invention proposes a novel system and method for automatically adjusting the bleed suppression threshold for the above-mentioned problems, which uses a judgment mechanism to automatically adjust the threshold to effectively suppress the bleed phenomenon.

Contents of the invention

One of the objectives of the present invention is to provide a system and method for automatically adjusting the flooding suppression threshold, which automatically adjusts the threshold according to the amount of flooding remaining in the image data after the flooding suppression, and then effectively suppresses the image data at that time. color phenomenon.

One of the objectives of the present invention is to provide a system and method for automatically adjusting the flooding suppression threshold, which resets the threshold to the initial value when the image data scene changes, so as to avoid cracking or dots caused by suppressing dynamic flooding points Phenomenon, so that the phenomenon of flooding can be effectively suppressed.

The system for automatically adjusting the flooding suppression threshold of the present invention mainly includes a flooding suppression unit, a statistical unit and an adjustment unit. The flooding suppression unit is used to receive an input image data and find multiple flooding color point, and judge whether the pan color point is static or dynamic according to a threshold defining static or dynamic, so as to suppress the static pan color point and generate an output image data. In the adjustment method of the present invention, the statistics unit receives the suppressed output image data, and counts the amount of blooming of the suppressed output image data, and then the adjustment unit receives the statistics of the blooming amount counted by the statistics unit and compares the blooming amount according to a reference value. The amount of color, and then correspondingly transmit an adjustment signal to the flood suppression unit to adjust the threshold.

In addition, the system of the present invention further includes a reset unit, which detects whether the input image data has a scene change (scene change), and if the image data scene changes, then sends a reset signal to the flood suppression unit to reset the threshold to The initial value, and avoid suppressing the dynamic flood point and causing broken or dot phenomenon.

Description of drawings

Fig. 1 is a block diagram of a preferred embodiment of the present invention; And

Fig. 2 is a flowchart of a preferred embodiment of the present invention.

Detailed ways

In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, preferred embodiments and detailed descriptions are provided, as follows:

Please refer to the first figure, which is a block diagram of a preferred embodiment of the present invention. As shown in the figure, the automatic adjustment threshold system for bleed suppression in this embodiment includes a bleed suppression unit 10 , a statistics unit 12 and an adjustment unit 14 . The flood suppression unit 10 is used to receive an input image data and find all the multiple flood points of the input image data, wherein the flood suppression unit 10 adopts a field (Field), frame (Frame) or straight line (line) search method to find All flood points of the input image data. Since there are many ways to find the bleed point of the input image data, the above is only an overview of some implementations adopted by the bleed suppression unit 10 of this embodiment.

In addition, a threshold is preset in the flood suppression unit 10 , which is the dynamic and static boundary of the flood point, and the flood suppression unit 10 judges whether the flood point of the input image data is static or dynamic according to the threshold. A preferred embodiment of the pan-color suppression unit 10 of the present invention adopts a Sum of Absolute Difference (SAD) method to determine whether the pan-color point is static or dynamic, and the threshold is the sum of absolute error threshold. After confirming which panchromatic points are static, the panchromatic suppression unit 10 will suppress the static panchromatic spots, and generate an output image data. A preferred embodiment of the present invention utilizes a three-dimensional dynamic comb filter (3D Comb Filter ) to suppress the static flood point.

Referring to the first figure again, the statistical unit 12 is used to receive the output image data, and count the flooding amount of the output image data, that is, the number of flooding points, so it can be known that the flooding suppression unit 10 is based on the preset threshold value. The amount of bleed remaining after the input image data has been bleed suppressed. The adjustment unit 14 has a preset reference value, and this reference value defines the amount of flooding that the viewer can accept in the input image. When the remaining bleed amount is less than the reference value, it means that the bleed suppression unit 10 has a good effect of suppressing bleed. Relatively speaking, if the remaining bleed amount of the output image data is greater than the reference value, it means that the bleed suppression unit 10 The effect of suppressing the flooding of the flooding suppressing unit 10 is not good, which further indicates that the preset threshold of the flooding suppressing unit 10 is not suitable for the input image data sent to the flooding suppressing unit 10 at present, so the threshold must be adjusted.

In a preferred embodiment of the present invention, the adjustment unit 14 compares the amount of blooming of the output image data according to the reference value, and knows the suppression effect of the flooding suppression unit 10. If the suppression effect of the flooding suppression unit is not good, an adjustment is sent accordingly. The signal is sent to the flood suppression unit 10, so that the flood suppression unit 10 automatically adjusts the threshold. One preferred embodiment of the automatic threshold adjustment of the flood suppression unit 10 of the present invention is to preset a fixed adjustment value, and when the flood suppression unit 10 receives an adjustment signal, it automatically adjusts the threshold according to the fixed adjustment value; or preset There are multiple sets of thresholds. After receiving the adjustment signal, the bloom suppression unit 10 automatically selects different sets of thresholds in order to automatically adjust the thresholds. The reference value of the above-mentioned adjustment unit 14 can be freely adjusted by the user. From the above, it can be seen that the system of this embodiment can automatically adjust the threshold according to the remaining amount of blooming in the output image data after the blooming suppression, so as to effectively suppress the blooming phenomenon of the image data at that time.

In addition, in order to avoid that the previously adjusted threshold value of the flood suppression unit 10 will cause the flood suppression unit 10 to judge the dynamic flood point as a static point, so another preferred embodiment of the system of the present invention further includes a reset unit 16 to use When detecting whether the input image data has a scene change (scene change), if the input image data scene changes, then send a reset signal to the flood suppression unit 10, so that the flood suppression unit 10 resets the threshold to be the initial value, so that To prevent the bleed suppression unit 10 from cracking or halftone dots based on previously adjusted thresholds to suppress dynamic bleed points, so that the bleed phenomenon can be reliably suppressed and the bleed suppression effect of the bleed suppression unit 10 of this embodiment can be improved. Since there are many conventional methods for detecting whether the input image data is a scene change, no further details are given here.

Furthermore, the system of this embodiment can be applied to devices such as a video decoder (Video Decoder), a TV controller (TV Controller) or a moving picture compression standard decoder (Moving Picture Experts Group Decoder, MPEG Decoder).

Please refer to the second figure, which is a flowchart of a preferred embodiment of the present invention. As shown in the figure, when the input image data is transmitted to the flood suppression unit 10, step S10 is first performed to find a plurality of flood points of the input image data. This step can use a field (Field), a frame (Frame) or a straight line ( line) search method to find the pan-color point of the input image data; then, step S12 is executed to determine whether the pan-color point is static or dynamic according to the threshold, which can be judged to be static or dynamic by the method of sum absolute error, and The threshold is the total absolute error threshold; then, step S14 is executed to suppress the static pan-color points to generate output image data. In this step, a three-dimensional dynamic comb filter (3D Comb Filter) method can be used to suppress the static pan-color points point.

Next, step S16 is executed to count the amount of bleed of the output image data after the bleed is suppressed, that is, the number of bleed points; and then step S18 is executed to compare the amount of bleed of the output image data according to the reference value to adjust the threshold , this step judges whether the blooming amount of the output image data meets the reference value, if it meets, the threshold is not adjusted, and if not, the threshold is adjusted. It can be known from the above that the present embodiment automatically adjusts the threshold according to the amount of blooming of the image data after the blooming suppression, so that the blooming phenomenon of the input image data at that time can be effectively suppressed. In addition, in step S10 , it is further detected whether the scene of the input image data changes, and if the scene of the input image data changes, the threshold is reset to an initial value.

To sum up, the system for automatically adjusting the flood suppression threshold includes a flood suppression unit, a statistics unit and an adjustment unit. In the method of automatically adjusting the threshold value of the flooding suppression, the flooding suppression unit searches for a plurality of flooding points of the input image data, and judges whether the flooding points are static or dynamic according to the threshold, so as to suppress the static flooding points and then generate the output image data, The statistical unit counts the amount of blooming of the output image data, that is, the number of flooding points, and then the adjustment unit compares the blooming amount of the output image data according to the reference value, and then sends an adjustment signal to the flooding suppression unit for adjustment. In this way, the threshold value can be automatically adjusted, thereby effectively suppressing the flooding phenomenon of the image data at that time.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Equivalent changes and modifications to the shape, structure, and features within the patent scope and spirit of the present invention should be included in this document. Inventions within the scope of patent applications.

Claims (6)

1. automatic method of adjustment cross-color artifact inhibition threshold comprises step:

Seek a plurality of film color points of an input image data;

According to a threshold value, judge that said a plurality of film color point is for static or dynamic;

Suppress static said a plurality of film color points, produce an output image data;

Add up one of this output image data film color amount; And

According to a reference value, this film color amount of this output image data relatively, and corresponding this threshold value of adjustment, whether scene changes wherein to detect this input image data, this threshold value is an initial value if this input image data scene was then reset when changing, and

Wherein according to a threshold value, judge that said a plurality of film color point is static or dynamic step, adopt the mode of summation absolute error, this threshold value is a summation absolute error threshold value.

2. the method for claim 1, wherein this method be applied to picture decoder, control device of the tv and dynamic image compression standard decoder at least one of them.

3. the method for claim 1 is wherein sought the step of said a plurality of film color points of an input image data, adopt field, frame and straight line seek mode at least one of them.

4. automatic system of the threshold value that suppresses of adjustment film color, it comprises:

One film color suppresses the unit; Receive an input image data and seek a plurality of film color points of this input image data; And be static state or dynamic according to the said a plurality of film color points of a threshold decision, and suppress static said a plurality of film color points, and then produce an output image data;

One statistics unit receives this output image data, adds up one of this output image data film color amount;

One adjustment unit receives this film color amount that this statistic unit adds up and according to a reference value this film color amount relatively, and then corresponding adjustment signal to this film color that transmits suppresses unit to adjust this threshold value; And

One reset cell, whether scene changes to detect this input image data, suppresses the unit if this input image data scene then passes a reset signal to this film color when changing, and is initial value with this threshold value of resetting,

Wherein this film color inhibition unit adopts the mode of summation absolute error to judge said a plurality of film color point for static or dynamic, and this threshold value is a summation absolute error threshold value.

5. system as claimed in claim 4, wherein this system applies in picture decoder, control device of the tv and dynamic image compression standard decoder at least one of them.

6. system as claimed in claim 4, wherein this film color suppresses unit employing field, frame or straight line searching mode, seeks said a plurality of film color points of this input image data.

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