JP2015219459A - Video display device, control method of video display device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce excess/deficiency of a correction degree when combinedly using processing of correcting by referring to image data between frames of a pixel of interest subject to correction processing, and processing for correcting by referring to image data of peripheral pixels of the pixel of interest.SOLUTION: The video display device includes: a first acquisition part that acquires an inter-frame correction amount on the basis of a video signal level of a current frame and a previous video signal level at least one frame prior to the current frame; a second acquisition part that acquires an inter-pixel correction amount on the basis of a video signal level of a pixel of interest and image signal levels of peripheral pixels of the pixel of interest; a determination part that determines the video correction amount on the basis of at least one of the inter-frame correction amount and the inter-pixel correction amount; and a correction part that corrects the video signal level of the pixel of interest of the current frame according to the video correction amount and outputs it.

Description

  The present invention relates to a video display device, a video display device control method, and a program.

  In recent years, video display devices including various video display devices have been widely used. In particular, liquid crystal display devices using a liquid crystal display panel are widely used as display devices for TVs and PCs. The liquid crystal display panel can display a desired image by adjusting the light transmittance by applying a driving voltage corresponding to the video signal level to the liquid crystal display panel.

  However, since the liquid crystal display panel does not have a sufficiently high liquid crystal response speed with respect to a change in the applied drive voltage, an afterimage may occur when a moving image is displayed, for example. Therefore, Patent Document 1 proposes an overdrive correction process in which image data to be displayed next is compared with previous image data and driven while compensating for liquid crystal response characteristics as a driving method for improving the liquid crystal response speed. ing.

  In addition, the liquid crystal display panel may be deteriorated in image quality due to a liquid crystal alignment defect called so-called disclination. In Patent Document 2, as a method for improving image quality degradation caused by disclination, a driving method is proposed in which a potential difference of driving voltages between pixels is reduced in accordance with a gradation level difference between adjacent pixels.

  As described above, it is possible to improve the image quality deterioration due to the liquid crystal response speed by the overdrive correction process, and it is possible to improve the image quality deterioration due to the disclination by the disclination correction process. is there.

Patent No. 03305240 US Pat. No. 6,727,872

  However, in the techniques described in Patent Document 1 and Patent Document 2, when correction processing is performed simultaneously or sequentially, the correction level may be excessive or insufficient, and the improvement level of image quality deterioration may be affected. .

  The present invention has been made in view of the above-described problems, and performs correction by referring to image data between frames of a target pixel to be corrected, and image data of peripheral pixels of the target pixel. The purpose is to reduce the excess and deficiency of the correction level when the correction process is shared.

A video display device according to the present invention that achieves the above-described object is as follows.
First acquisition means for acquiring an inter-frame correction amount based on the video signal level of the current frame and the video signal level of at least one frame before;
Second acquisition means for acquiring an inter-pixel correction amount based on a video signal level of a target pixel and a video signal level of a peripheral pixel of the target pixel;
Determining means for determining a video correction amount based on at least one of the inter-frame correction amount and the inter-pixel correction amount;
Correction means for correcting and outputting the video signal level of the pixel of interest in the current frame in accordance with the video correction amount.

  According to the present invention, the correction in the case where the correction processing with reference to the image data between the frames of the target pixel to be corrected and the correction processing with reference to the image data of the peripheral pixels of the target pixel are shared. It is possible to reduce the degree of excess and deficiency.

1 is a functional block diagram of a video display device according to a first embodiment. 6 is a flowchart showing a part of a processing procedure performed by the video display apparatus according to the first embodiment. The flowchart which shows a part of process sequence which the video display apparatus concerning 2nd Embodiment implements. The flowchart which shows a part of process sequence which the video display apparatus concerning 3rd Embodiment implements. The flowchart which shows a part of process sequence which the video display apparatus concerning 5th Embodiment implements. The functional block diagram of the video display apparatus in 6th Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below shows an example when the present invention is specifically implemented, and is one of the specific examples of the configurations described in the claims.

(First embodiment)
FIG. 1 is a functional block diagram of the video display apparatus according to the first embodiment. In FIG. 1, 101 is a frame memory unit, 102 is an inter-frame correction amount acquisition unit, 103 is an inter-pixel correction amount acquisition unit, 104 is a video correction amount determination unit, and 105 is a video correction unit. The video display device of the present invention includes a liquid crystal drive unit and a liquid crystal display panel (not shown), and displays video on the liquid crystal display panel via the liquid crystal drive unit. Moreover, you may have a video adjustment part which is not shown in figure, and the video signal in which the contrast emphasis process and the gamma conversion process were performed in the video adjustment part may be input. Control of each function of these components is performed by a CPU (not shown) reading out a program from the memory and executing it.

  The frame memory unit 101 includes a memory controller (not shown), stores an input video signal, outputs it to the interframe correction amount acquisition unit 102 with a delay of at least one frame.

  The inter-frame correction amount acquisition unit 102 calculates and acquires the correction amount of the target pixel according to the video signal level of the current frame and the video signal level of at least one frame before. One frame period is, for example, 16.7 msec in the case of 60 Hz progressive input. However, the present invention is not limited to this, and a video signal of one frame may be divided into two or more fields for display. In the present invention, one field when one frame is divided and displayed is also expressed as one frame.

  Hereinafter, description will be made assuming that the interframe correction amount acquisition unit 102 performs overdrive correction processing. The overdrive correction process is a process for increasing or decreasing the drive voltage applied to the liquid crystal display panel by correcting the video signal level so as to be emphasized. The purpose is to improve the liquid crystal response speed by compensating the response characteristics of the liquid crystal. The liquid crystal display panel does not necessarily reach a desired signal level within one frame period because the liquid crystal response speed is not sufficiently high with respect to the change of the applied drive voltage. Therefore, by performing overdrive correction processing, the video signal level is emphasized and the transition period to the desired signal level is shortened. At this time, the overdrive correction amount is determined by the video signal level of the current frame, the video signal level of the previous frame, and the response characteristics of the liquid crystal display panel.

  The inter-frame correction amount acquisition unit 102 has an LUT (Lookup Table) in which an overdrive correction amount is associated according to the video signal level of the current frame and the video signal level of the previous frame. An overdrive correction amount is selected for each pixel of interest. The overdrive correction amount indicates a signal level to be added to or subtracted from the video signal level of the target pixel. The interframe correction amount acquisition unit 102 outputs the selected overdrive correction amount to the video correction amount determination unit 104 as an interframe correction amount.

  The inter-pixel correction amount acquisition unit 103 performs a process of correcting the target pixel using the two-dimensional spatial information of the image. For example, two-dimensional spatial filtering processing is performed using the video signal levels of the pixel of interest and its surrounding pixels.

  In the following description, it is assumed that the inter-pixel correction amount acquisition unit 103 performs a disclination correction process. The disclination correction process is a process of correcting the video signal level in order to improve image quality deterioration caused by disclination.

  For example, the inter-pixel correction amount acquisition unit 103 determines the disclination correction amount according to the video signal level of the target pixel and the video signal level of any one (or more) of the eight pixels adjacent to the target pixel. It has a LUT associated with each other, and selects a disclination correction amount for each pixel of interest. The disclination correction amount indicates a signal level to be added to or subtracted from the video signal level of the pixel of interest, and is selected so that the video signal level falls within a predetermined upper limit level and lower limit level. The inter-pixel correction amount acquisition unit 103 outputs the selected disclination correction amount to the video correction amount determination unit 104 as the inter-pixel correction amount.

  The video correction amount determination unit 104 determines the video correction amount to be applied to the video signal level of the target pixel according to the inter-frame correction amount and the inter-pixel correction amount. In this embodiment, it is determined whether or not the absolute value of the inter-frame correction amount is smaller than a predetermined threshold value. If the absolute value is less than the threshold value, the inter-pixel correction amount is selected and output. Select the correction amount and output it. One of the selected correction amounts is added or subtracted for each pixel of interest by the video correction unit 105.

  Next, a processing procedure performed by the video correction amount determination unit 104 of the video display device according to the first embodiment will be described with reference to the flowchart of FIG. As described above, the inter-frame correction amount is described as an overdrive correction amount, and the inter-pixel correction amount is described as a disclination correction amount.

  First, in step S201, the video correction amount determination unit 104 determines whether or not the absolute value of the overdrive correction amount (interframe correction amount) is equal to or less than a predetermined threshold value. If the absolute value is less than or equal to the threshold (S201; YES), the process proceeds to step S202. On the other hand, when the absolute value is larger than the threshold value (S201; NO), the process proceeds to step S203.

  In step S202, the video correction amount determination unit 104 selects and outputs a disclination correction amount (inter-pixel correction amount).

  In step S203, the video correction amount determination unit 104 selects and outputs an overdrive correction amount (interframe correction amount). Thus, the processes in the flowchart of FIG. 2 are completed. By performing the processing flow of FIG. 2, when the absolute value of the overdrive correction amount is small (below the threshold value), it is determined that there is little deterioration in image quality due to the influence of the liquid crystal response speed, and the disclination correction process is given priority. Can be applied. The threshold value may be a minimum value (0) or an arbitrary value. For example, when the threshold is set to the minimum value (0), the disclination correction process is applied only to the video signal level where the overdrive correction amount is 0, that is, the overdrive correction process is not performed. The threshold value is preferably within 10% of the dynamic range of the video signal level.

  Note that the absolute value of the disclination correction amount may be compared with a threshold value, and if it is equal to or less than the threshold value, the overdrive correction amount may be selected. In this case, when the disclination correction amount is small (below the threshold), it is determined that there is little deterioration in image quality due to the influence of disclination, and the liquid crystal response speed improvement process can be preferentially applied.

  Further, the threshold value may be set according to the correction process that the user wants to apply preferentially, or may be determined according to the input video signal type or the usage state of the video display device. For example, the threshold may be determined so that the disclination correction process is preferentially applied to a video with little motion. In addition, when a video signal having a large signal level difference between pixels is input, the threshold value may be determined so that the disclination correction process is preferentially applied.

  As described above, in the present embodiment, one of the correction amounts between the inter-frame correction process and the inter-pixel correction process is selected, and the correction process is applied. It is possible to reduce excess and deficiency, that is, reduction of excess and deficiency to the extent of improvement.

  At this time, in the present embodiment, the degree of influence on the image quality degradation of the video is estimated based on the magnitude relationship between the absolute value of the interframe correction amount and the threshold value, and the correction processing to be applied is determined. As a result, the correction process is preferentially applied to the factor that has been estimated to have a large influence on the image quality degradation of the video image, so that a good correction process can be realized. In particular, even when the overdrive correction process and the disclination correction process are shared, an excellent video display device correction process can be realized.

(Second Embodiment)
In the second embodiment, the processing of the video correction amount determination unit 104 in the first embodiment is different. The configuration example of the video display device is the same as that of the first embodiment, and the description of the same function is omitted. The video correction amount determination unit 104 in the second embodiment compares the absolute value of the inter-frame correction amount with the absolute value of the inter-pixel correction amount, and selects and outputs a correction amount having a large correction degree. The output correction amount is added or subtracted for each pixel of interest by the video correction unit 105.

  Next, a processing procedure performed by the video correction amount determination unit 104 of the video display device according to the first embodiment will be described with reference to the flowchart of FIG. As described above, the inter-frame correction amount is described as an overdrive correction amount, and the inter-pixel correction amount is described as a disclination correction amount.

  First, in step S301, the video correction amount determination unit 104 compares the absolute value of the overdrive correction amount (interframe correction amount) with the absolute value of the disclination correction amount, and the absolute value of the overdrive correction amount is the disc. It is determined whether or not the relative correction amount is larger than the absolute value. If the absolute value of the overdrive correction amount is larger than the absolute value of the disclination correction amount (S301; YES), the process proceeds to step S302. On the other hand, when the absolute value of the overdrive correction amount is equal to or smaller than the absolute value of the disclination correction amount (S301; NO), the process proceeds to step S303.

  In step S302, the video correction amount determination unit 104 selects and outputs an overdrive correction amount (interframe correction amount).

  In step S303, the video correction amount determination unit 104 selects and outputs a disclination correction amount (inter-pixel correction amount). Thus, each process of the flowchart of FIG. 3 is completed. By performing the processing flow of FIG. 3, it is possible to preferentially apply a correction process with a large correction degree. Note that it is also possible to apply both the processing flow described with reference to FIG. 2 in the first embodiment and the processing flow described with reference to FIG. 3 in the present embodiment. For example, the magnitude relationship with the threshold value is determined based on the processing flow of FIG. 2 (step S201). If the threshold value is less than or equal to the threshold value, the process proceeds to step S202. A correction amount having a large absolute value may be selected and output.

  As described above, in the present embodiment, since either one of the inter-frame correction processing and the inter-pixel correction processing is selected and the correction processing is applied, the excess or deficiency of correction when a plurality of correction processings are shared is reduced. That is, it is possible to reduce the excess and deficiency to the extent of improvement.

  At this time, in the present embodiment, the absolute values of the respective correction amounts are compared, the degree of influence on the image quality degradation of the video is estimated based on the magnitude relationship, and the correction processing to be applied is determined. As a result, it is possible to preferentially apply the correction process to the factor that is estimated to have a large influence on the image quality degradation of the video, and thus it is possible to realize a good correction process.

(Third embodiment)
In the third embodiment, the processing of the video correction amount determination unit 104 in the first embodiment is different. The configuration example of the video display device is the same as that of the first embodiment, and the description of the same function is omitted. The video correction amount determination unit 104 in the third embodiment determines whether or not the increase / decrease directions of the inter-frame correction amount and the inter-pixel correction amount are the same, and in the case of being the same, the two correction amounts are combined and output.

  Here, the increase / decrease direction of the correction amount is based on whether or not the video signal level of the pixel of interest increases before and after the correction. If the correction amount is configured to add to or subtract from the video signal level, the correction amount Whether or not the codes are the same is a determination condition. For example, in the case of a configuration in which the correction amount is multiplied (gain calculation) with respect to the video signal level, whether or not the correction amount is larger than 1.0 is a determination condition. In the present embodiment, the correction amount has a sign and is configured to add / subtract to the video signal level.

  Next, a processing procedure performed by the video correction amount determination unit 104 of the video display device according to the first embodiment will be described with reference to the flowchart of FIG. As described above, the inter-frame correction amount is described as an overdrive correction amount, and the inter-pixel correction amount is described as a disclination correction amount.

  First, in step S401, the video correction amount determination unit 104 compares the signs of the overdrive correction amount and the disclination correction amount, and determines whether the increase / decrease direction of the correction amount is the same. If the signs are the same, that is, the increase / decrease direction of the correction amount is the same (S401; YES), the process proceeds to step S402. On the other hand, when the signs are different, that is, when the correction amount increase / decrease direction is different (S401; NO), the process proceeds to step S403.

  In step S402, the video correction amount determination unit 104 synthesizes and outputs the overdrive correction amount and the disclination correction amount. For example, when each correction amount is “+30” and “+15”, “+45” is output, and when each correction amount is “−30” and “−15”, for example, “−45” is output. .

  Since each process of step S403-step S405 is the same as each process of step S301-step 303 demonstrated with reference to FIG. 3, description is abbreviate | omitted. Thus, the processes in the flowchart of FIG. 4 are completed.

  Note that the processing flow described with reference to FIG. 2 in the first embodiment may be applied in combination. For example, if the codes are different in step S401, it is determined whether the interframe correction amount is equal to or smaller than the threshold based on the processing flow of FIG. 2 (step S201), and if it is equal to or smaller than the threshold, the process proceeds to step S202. . On the other hand, if larger than the threshold value, the process proceeds to step S403, and a correction amount having a large absolute value is selected and output.

  Also, for example, first, the magnitude relationship with the threshold value is determined based on the processing flow of FIG. 2 (step S201). If the threshold value is less than or equal to the threshold value, the process proceeds to step S202. The processing may proceed based on the processing flow of FIG. In any processing flow, when the increase / decrease direction of the inter-frame correction amount and the increase / decrease direction of the inter-pixel correction amount are the same, the two correction amounts can be synthesized and output.

  If the video signal level is multiplied by a correction amount (gain calculation), the result of multiplying both correction amounts may be output as a composite result.

  As described above, in the present embodiment, when the increase / decrease direction of the correction amount is the same in the inter-frame correction processing and the inter-pixel correction processing, the correction amounts are combined. As a result, any correction process can be applied, so that the shortage of correction when a plurality of correction processes are shared can be reduced, that is, the lack of improvement can be reduced.

(Fourth embodiment)
In the fourth embodiment, the processing of the video correction amount determination unit 104 in the first embodiment is different. The configuration example of the video display device is the same as that of the first embodiment, and the description of the same function is omitted. In the third embodiment, one of the inter-frame correction amount and the inter-pixel correction amount is selected, and / or 2 when the increase / decrease directions of the inter-frame correction amount and the inter-pixel correction amount are the same. An example in which two correction amounts are combined and output has been described.

  The present embodiment is an example of combining regardless of the increase / decrease direction, and the video correction amount determination unit 104 combines and outputs the correction amounts of the inter-frame correction processing and the inter-pixel correction processing. Here, “synthesizing” means adding correction amounts if the correction amount is added to or subtracted from the video signal level. For example, if the video signal level is configured to multiply the correction amount (gain calculation), the correction amount is multiplied.

  At this time, it is desirable to synthesize at a predetermined ratio. For example, if the correction amount is added to or subtracted from the video signal level, each correction amount is multiplied by a predetermined gain coefficient and then added. It is desirable that the predetermined gain coefficient is 1 or less. Further, if the correction amount after synthesis is adjusted so as to fall within the predetermined upper limit value and lower limit value, it is possible to reduce the excess and deficiency of correction when the correction process is shared.

  As described above, in the present embodiment, each correction process can be shared by combining the correction amounts of the inter-frame correction process and the inter-pixel correction process. In addition, it is possible to reduce the excess and deficiency of correction when a plurality of correction processes are shared by combining at a predetermined ratio and adjusting the combined correction amount to be within a predetermined range. Become.

(Fifth embodiment)
In the fifth embodiment, the processing of the video correction amount determination unit 104 in the first embodiment is different, and an example in which the correction amount is adjusted and output according to each correction amount will be described. The configuration example of the video display device is the same as that of the first embodiment, and the description of the same function is omitted.

  Next, a processing procedure performed by the video correction amount determination unit 104 of the video display device according to the fifth embodiment will be described with reference to the flowchart of FIG. As described above, the inter-frame correction amount is described as an overdrive correction amount, and the inter-pixel correction amount is described as a disclination correction amount.

  First, in step S501, the video correction amount determination unit 104 selects either one of the correction amount between frames or the correction amount between pixels. Here, the larger correction amount may be selected based on the absolute value of each correction amount, or the correction amount of the correction process to be preferentially applied may be selected.

  Next, in step S502, the video correction amount determination unit 104 adjusts and outputs the selected correction amount according to the unselected correction amount. For example, when the signs of the respective correction amounts are the same, they are combined and output so as to be within a predetermined maximum correction amount. On the other hand, when the signs are different, it is desirable to adjust so as to reduce the correction amount. For example, after multiplying a correction amount that has not been selected by a predetermined gain coefficient, the correction amount is combined. At this time, it is desirable that the predetermined gain coefficient is 1 or less. Thus, the processes in the flowchart of FIG. 5 are completed.

  As described above, in the present embodiment, the correction amount is adjusted according to the magnitude and the increase / decrease direction of each correction amount in the inter-frame correction process and the inter-pixel correction process. Thereby, it is possible to reduce the excess and deficiency of correction when a plurality of correction processes are shared, that is, it is possible to reduce the excess and deficiency of the improvement degree.

(Sixth embodiment)
In each of the above-described embodiments, the overdrive correction process has been described as an example of the interframe correction process. As described above, the overdrive correction process is a process for increasing or decreasing the drive voltage applied to the liquid crystal display panel by correcting the video signal level so as to be emphasized. The purpose is to improve the liquid crystal response speed by compensating the response characteristics of the liquid crystal. The liquid crystal display panel does not necessarily reach a desired signal level within one frame period because the liquid crystal response speed is not sufficiently high with respect to the change of the applied drive voltage. Therefore, by performing overdrive processing, the video signal level is emphasized and the transition period to the desired signal level is shortened. At this time, a suitable overdrive correction amount is determined by the video signal level of the current frame, the video signal level of the previous frame, and the response characteristics of the liquid crystal display panel.

  On the other hand, even if the overdrive correction process is performed, a desired signal level is not always reached within one frame period. If the desired signal level has not been reached, there will be a difference between the video signal level one frame before used in calculating the overdrive correction amount and the signal level actually reached one frame before. Become.

  In the sixth embodiment, an example in which an error that may occur when calculating an overdrive correction amount by predicting a signal level to be reached in advance will be described. Although the overdrive correction process will be described as an example, the present invention can be similarly applied to a process in which an error may occur in the process result in the interframe correction process.

  FIG. 6 is a functional block diagram of a video display apparatus according to the sixth embodiment. The same components as those in the above-described embodiment are denoted by the same reference numerals. In FIG. 6, reference numeral 601 denotes a frame memory unit, 602 denotes an inter-frame change detection unit, 603 denotes an arrival prediction unit, and 604 denotes an inter-frame correction amount acquisition unit. As described above, the inter-frame correction process is described as an overdrive correction process, and the inter-pixel correction process is described as a disclination correction process.

  The frame memory unit 601 includes a memory controller (not shown), stores an input video signal, outputs it to the inter-frame change detection unit 602, and the arrival prediction unit 603 with a delay of at least one frame. The frame memory unit 601 stores the correction amount determined by the video correction amount determination unit 104, and outputs the correction amount to the arrival prediction unit 603 with a delay of at least one frame.

  The inter-frame change detection unit 602 detects whether the video signal level of the pixel of interest has changed between frames according to the video signal level of the current frame and the video signal level of at least one frame before. The presence / absence of detection is output to the inter-frame correction amount acquisition unit 604.

  The arrival prediction unit 603 predicts the arrival signal level corresponding to the actually reached voltage level and outputs it to the interframe correction amount acquisition unit 604 when driving a liquid crystal display panel (not shown). Specifically, the calculation is performed based on the video signal level at least one frame before stored in the frame memory unit 601 and the correction amount at least one frame before. For example, according to the combination of the video signal level and the correction amount, a signal level that the liquid crystal display panel actually reaches after one frame period is selected and output from the stored LUT.

  The inter-frame correction amount acquisition unit 604 has an LUT in which the overdrive correction amount is associated according to the video signal level of the current frame and the arrival signal level, and sets the overdrive correction amount for each pixel of interest. Select and output as an interframe correction amount. However, at this time, when the detection result of the inter-frame change detection unit 602 is “None”, the overdrive correction amount is set to 0 (equivalent to overdrive correction processing invalid).

  The video correction amount determination unit 104 determines the video correction amount to be applied to the video signal level of the target pixel according to the inter-frame correction amount and the inter-pixel correction amount. Note that the processing flow of the video correction amount may be any processing flow as long as it has been described in the above-described embodiment, and may be a combination of these processing flows.

  As described above, according to the present embodiment, it is possible to reduce the excess and deficiency of correction when a plurality of correction processes are shared, while overdrive correction is performed by predicting the signal level to be reached in advance. It is possible to reduce errors that may occur in the processing. This makes it possible to realize a good correction process.

    Although the liquid crystal display panel has been described as the video display device, any device may be used as long as it compensates the response characteristics of the video display device. In addition, although the overdrive correction process and the disclination correction process have been described as the two correction processes, the same applies to any process that calculates a correction amount between frames and a process that calculates a correction amount within a frame. It can also be applied to three or more correction processes.

  In particular, the processing flow of the video correction amount determination unit 104 may be realized by combining the processing flows described in the above-described embodiments. As a configuration for selecting a plurality of processing flows, input video type, user adjustment, Moreover, you may select by the characteristic of a video display device.

  As described above, according to the video display device of the present invention, the correction processing is performed by referring to the image data between the frames of the target pixel to be corrected, and the image data of the peripheral pixels of the target pixel is referred to. Therefore, it is possible to reduce the excess or deficiency of the correction level when the correction processing is shared.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  101: Frame memory unit, 102: Inter-frame correction amount acquisition unit, 103: Inter-pixel correction amount acquisition unit, 104: Video correction amount determination unit, 105: Video correction unit, 601: Frame memory unit, 602: Inter-frame change detection 603: arrival prediction unit 604: interframe correction amount acquisition unit

Claims (15)

First acquisition means for acquiring an inter-frame correction amount based on the video signal level of the current frame and the video signal level of at least one frame before;
Second acquisition means for acquiring an inter-pixel correction amount based on a video signal level of a target pixel and a video signal level of a peripheral pixel of the target pixel;
Determining means for determining a video correction amount based on at least one of the inter-frame correction amount and the inter-pixel correction amount;
And a correction unit that corrects and outputs a video signal level of the target pixel in the current frame in accordance with the video correction amount. The video display device displays video using a video display device,
The first acquisition means includes
The correction amount for compensating the response characteristic of the video display device is acquired based on the video signal level of the current frame of the pixel of interest and the video signal level of at least one frame before. Video display device.   The second acquisition unit is configured such that the video signal level of the target pixel falls within a predetermined upper limit level and lower limit level based on the video signal level of the target pixel and the video signal level of a pixel adjacent to the target pixel. The video display apparatus according to claim 1, wherein the correction amount is acquired as described above.   4. The video display device according to claim 1, wherein the determination unit determines the video correction amount by combining the inter-frame correction amount and the inter-pixel correction amount. 5.   4. The determination unit according to claim 1, wherein the determination unit selects a correction amount between the inter-frame correction amount and the inter-pixel correction amount based on a correction degree and determines the correction amount as the video correction amount. The video display device according to any one of the above.   The video display device according to claim 5, wherein the determining unit selects and determines the inter-pixel correction amount as the video correction amount when the inter-frame correction amount is equal to or less than a threshold value.   The video display device according to claim 5, wherein the determination unit selects the inter-frame correction amount and determines the correction amount as the video correction amount when the inter-pixel correction amount is equal to or less than a threshold value.   6. The video display according to claim 5, wherein when the inter-frame correction amount is larger than the inter-pixel correction amount, the determining unit selects and determines the inter-frame correction amount as the video correction amount. apparatus.   6. The video according to claim 5, wherein, when the inter-frame correction amount is not larger than the inter-pixel correction amount, the determination unit selects the inter-pixel correction amount and determines the inter-frame correction amount as the video correction amount. Display device.   4. The video display device according to claim 1, wherein the determination unit corrects the inter-frame correction amount according to the inter-pixel correction amount and determines the correction amount as the video correction amount. 5. .   4. The video display device according to claim 1, wherein the determination unit corrects the inter-pixel correction amount according to the inter-frame correction amount and determines the correction amount as the video correction amount. 5. . The video display device displays video using a video display device,
A prediction means for predicting a signal level that the video display device reaches after at least one frame period has passed based on a video signal level at least one frame before and a video correction amount at least one frame before;
The said 1st acquisition means acquires the said interframe correction amount based on the video signal level of the said present frame, and the said signal level to reach | attain, The one of Claims 1 thru | or 11 characterized by the above-mentioned. The video display device described. Detecting means for detecting a change in the video signal level between frames based on the video signal level of the current frame and the video signal level of at least one frame before;
13. The video display apparatus according to claim 12, wherein the first acquisition unit acquires the inter-frame correction amount as 0 when a change in the video signal level between the frames is not detected by the detection unit. . A method of controlling a video display device,
First acquiring means for acquiring an inter-frame correction amount based on the video signal level of the current frame and the video signal level of at least one frame before;
A second acquisition unit acquiring an inter-pixel correction amount based on a video signal level of a target pixel and a video signal level of a peripheral pixel of the target pixel;
A step of determining a video correction amount based on at least one of the inter-frame correction amount and the inter-pixel correction amount;
And a correction unit that corrects and outputs the video signal level of the target pixel in the current frame in accordance with the video correction amount.   The program for making a computer perform each process of the control method of the video display apparatus of Claim 14.

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