540 results about "Flicker" patented technology

A video signal including illumination flicker component is integrated at each of unit areas (horizontal lines) in a frame (field) of the video signal. The integrated level at each of the unit areas at the frame and the integrated level at the corresponding unit area of an adjacent frame are averaged. Dividing is effected between results of the averaging and integrating every unit area. It is judged whether flicker exists in the video signal by frequency-analyzing results of the dividing result at the unit areas. The unit area may be plural adjacent lines where flickering are negligible. The averaging circuit may be circulation type of or FIR filter. Threshold level for judging the flicker is changed according to a shutter speed control signal. Flicker compensation may be executed by controlling shutter speed or the AGC according to flicker judging result. A still condition at a block in a frame may be detected from the integration result at plural frames. When the block is judged to be still, the flicker is judged. An ac line frequency detection is also disclosed to detect the frequency of the ac line from a video signal generated under illumination including flicker. An imaging circuit may be provided to generate the video signal therein.

The present invention comprises a method and system for controlling the chromaticity and luminous flux output of a digitally controlled luminaire. The luminaire comprises one or more light-emitting elements and one or more light sensors which can provide optical feedback, wherein this optical feedback is filtered to remove undesired frequencies. The method and system comprises a control system which can sample the filtered signals from the light sensors according to a predetermined feedback sampling frequency scheme, wherein this scheme is specifically configured to provide sufficient iterations of the feedback loop to be performed for adjustment of the chromaticity and luminous flux output of the light-emitting elements, without perceptible visual flicker or momentary chromaticity shifts.

The present invention provides a display device with reduced power consumption and that reduces changes in luminance, and perceptibility of flicker, and a driving method thereof. A display device according to an exemplary embodiment comprises: a display panel configured to display a still image and a motion picture; a signal controller configured to control signals for driving the display panel; and a graphics processing unit configured to transmit input image data to the signal controller, wherein the signal controller comprises a frame memory configured to store the input image data, and the display panel is driven at a first frequency when the motion picture is displayed and the display panel is driven at a second frequency that is lower than the first frequency when the still image is displayed.

Systems and methods for rendering a complex character suitable for display on a monitor are provided. A raw character bitmap representing the complex character is filtered to form a filtered bitmap so as to reduce the effects of monitor flicker and enhance image contrast. The filtered bitmap is then scaled down to a target bitmap using a bilinear scaling operation followed by recursive cubic scaling operations. The target bitmap is suitably sized for storage in a memory device coupled to the monitor.

An apparatus and method for reducing the perception of flicker of solid state light sources. An alternating current (AC) signal is passed through an AC conditioning circuit and a passive resonating circuit before being supplied to a string of solid state light sources, such as light emitting diodes.

The present invention provides an effective flicker detection method performing a motion compensation. The present invention includes the steps of: calculating a luminance difference between neighboring pixels; summing up the luminance difference in a specific direction if the difference is greater than a threshold value; performing a motion estimation by using a sum calculated through step (b) to thereby calculate a motion displacement; performing a motion compensation to a current frame data by using the motion displacement; calculating a difference between a previous frame data and the compensated current frame data; and detecting the flicker by using the difference calculated in step (e).

The invention provides a display image flicker adjusting circuit and a method and a display device, which belong to the technical field of display, and can solve the problem that a display image flickers at the refreshing frequency switching moment of display equipment matched with a G-sync display technology at present. The display image flicker adjusting circuit comprises an identification module used for identifying a first refresh frequency of a current frame of display image and a refresh frequency of a next frame of display image according to a refresh frequency control signal; an obtaining module is used for obtaining first brightness corresponding to a preset gray scale under the first refresh frequency and second brightness corresponding to a preset gray scale under the second refresh frequency according to the corresponding relation between the gray scales and the brightness under the different refresh frequencies; and the compensation module is used for compensating the second brightness of the next frame of display picture according to the difference between the second brightness and the first brightness.

A method of determining when an image capture device with a rolling shutter is in an environment having a flickering illuminant by using autocorrelation or frequency analysis of difference vectors produced from first and second captured images.

The invention relates to the generation of user selected pages from an internet site and the delay in the reformatting of the same following a user selection of a new data event i.e. the selection of a new page which is to be displayed. In accordance with the invention, upon a user selection, reformatting of the page is delayed either for a predesignated time interval from the previous page reformatting or until all or a predefined amount of the data for the new page has been received. This allows the processor to be controlled hence preventing delays and / or errors in navigational functions and also can reduce the generation of “flicker” on the on-screen display.

The invention discloses a refresh rate switching display method and device, computer equipment and a medium. One specific embodiment of the method comprises the following steps: acquiring gray-scale reference voltage of each gray scale; calculating gray scale voltage variation of each gray scale corresponding to different refresh rates; compensating the gray-scale reference voltage of the corresponding gray scale according to the gray-scale voltage variation of each gray scale corresponding to different refresh rates to obtain gray-scale compensation voltage of each gray scale corresponding todifferent refresh rates; and when the refresh rates in the same gray scale are switched, performing display driving by utilizing the gray scale compensation voltage of the current refresh rate corresponding to the gray scale. According to the embodiment, the display drive can be accurately and efficiently controlled, the image flicker phenomenon occurring when the refresh rate in the same gray scale is switched can be effectively eliminated, and then the display effect and the user experience can be improved.

A display driving circuit, a display device, and a portable terminal including the driving circuit and the display device, which prevent the occurrence of flicker are provided. The display device includes a display panel including a plurality of pixels, a plurality of data lines and a plurality of gate lines that are respectively connected with the plurality of pixels, and a display driving circuit configured to vary a frame frequency of the display panel according to an operation mode, to select a gamma curve corresponding to the frame frequency, wherein the selected gamma curve is one among a plurality of gamma curves that are set so as to correspond to different frame frequencies, and to drive the display panel based on the selected gamma curve.

A circuit includes a luminance average value output unit for extracting luminance values from pixel data of the first and the second frames to generate first luminance average values for pixel lines of the first frame and second luminance average values for pixel lines of the second frame, a flicker curve generating unit for subtracting the second luminance average values from the first luminance average values, thereby generating a flicker curve, and a flicker detecting unit for extracting a plurality of local minimum points from the flicker curve, calculating a distance between each two neighboring local minimum points of the extracted local minimum points, and determining whether the flicker is present based on the distances and the frequency numbers of the distances.

Viewing angle characteristics on the entire display surface are improved while suppressing harmful effects such as flicker and banding caused by viewing angle improvement control. A liquid crystal display apparatus (1) includes: a liquid crystal panel (11) which includes a plurality of pixels arranged in a matrix; a drive control unit (24) which performs viewing angle improvement processing by converting a gradation of a video signal input to the pixel; and a processing object determination unit (22) which determines whether or not an image displayed on each of the pixels of the liquid crystal panel (11) is an image having an intermediate color. The drive control unit (24) is configured to perform the viewing angle improvement processing on the pixel determined by the processing object determination unit (22) such that the pixel displays the image having the intermediate color.

A method for eliminating flicker of a multi-exposure imaging system is provided. The method includes the steps of: capturing a long exposure image based on a long exposure from a scene; capturing a short exposure image based on a short exposure from the scene; obtaining an exposure ratio of the long exposure to the short exposure; generating a long accumulated value by accumulating pixel values of a portion of the long exposure image; generating a short accumulated value by accumulating pixel values of a portion of the short exposure image corresponding to the portion of the long exposure image; and generating a flicker gain according to the long average value, the short average value and the exposure ratio.

A gate driver circuit, a display panel, and a display device. A number of emission start signals, with at least one a delay time, a pulse width, or a combination thereof, are supplied in a frame period in which display driving is performed at a low driving frequency. This decreases a degree by which luminance appearing in the frame period is reduced, or changes characteristics of frequency components of luminance, thereby preventing flicker from being observed. The display driving is performed at the low driving frequency reduces power consumption, and is performed at a lower driving frequency to improve the efficiency of the display device.

The invention relates to a flicker value calculation method based on improved FFT and an inverter. In order to solve the technical problems, the flicker value calculation method based on the improved FFT and the inverter are provided, and high-precision flicker value calculation is achieved. According to the technical scheme, the method includes the steps that (1), all phases of voltage signals are sampled to obtain a voltage sampled sequence; (2), a voltage root-mean-square value is calculated according to sampling length per semi-circle wave, so that a voltage root-mean-square value sequence is obtained; (3), the average value of the voltage root-mean-square value sequence is calculated, and the average value is subtracted from each voltage root-mean-square value, so that a new voltage root-mean-square value sequence is obtained; the new voltage root-mean-square value sequence is windowed, FFT is performed, and amplitude frequency is corrected through double spectrum line interpolation operation; (5), curve fitting is performed on voltage fluctuation and fluctuation frequency discrete points; (6), please see the formula in the specification, a transient flicker value P is calculated; (7), the steps from one to six are repeated, all transient flicker values P within ten minutes are calculated, and according to the formula in the specification, a short-time flicker value Pst is calculated. The flicker value calculation method and inverter are used for the field of electric power technologies.

Embodiments provide techniques for stabilizing coloration for video content containing a plurality of frames. Embodiments include selecting a reference frame from the plurality of frames. A plurality of reference points are identified within the reference frame. Embodiments further include adjusting the coloration of each of two or more unselected frames in the plurality of frames, by identifying a second reference point within the unselected frame, corresponding to one of the plurality of reference points within the reference frame, determining a coloration difference between a depiction of the second reference point and a depiction of the corresponding reference point within the reference frame, and adjusting the coloration of the unselected frame, based on the determined coloration difference.

A solid-state image pick-up apparatus that is capable of suppressing luminance flicker and chroma flicker occurring under a florescent lamp. The apparatus has a CCD solid-state image pick-up device. The image pick-up device further includes an accumulation region that is able to temporarily accumulate signal charges that have been photoelectrically converted in a sensor unit. The device is able to exercise exposure control with the use of an electronic shutter. The apparatus also has a timing generating circuit that generates a shutter pulse XSUB and a read pulse XSG. The shutter pulse XSUB is used for determining a plurality of (for example, three) exposure periods during one field for the image pick-up device. The read pulse XSG is used for reading to the accumulation region the signal charges that have been accumulated in the sensor unit during a plurality of exposure periods.

The invention discloses a video image haze-removing processing method, which can meet a real-time haze-removing function, and meanwhile, can effectively eliminate flicker of video images obtained after haze removing. The method comprises the following specific steps: calculating atmosphere optical value of each frame image through a dark channel and a self-adaptive adjustment method; calculating initial transmissivity of a first frame image through a dark channel apriori algorithm; constructing an inter-frame transmissivity estimation and neighborhood space energy function, and calculating optimal transmissivity value of each region block; refining the initial transmissivity through a quick guide filtering algorithm; and obtaining the video images after haze removing through a haze-removing model.

An image capture apparatus comprises an X-Y address scan type image sensor; a flicker detector configured to detect a flicker of a light source; a switch configured to switch the image sensor between a first state in which the image sensor is driven by a first driving method which comprises reading out a pixel signal within a range of a first angle of view and a second state in which the image sensor is driven by a second driving method which comprises reading out a pixel signal within a range of a second angle of view narrower than the first driving method; and a controller configured to control the switch so as to drive the image sensor by the first driving method while the flicker detector is detecting the flicker and to drive image sensor by the second driving method when the flicker detector has completed flicker detection.

The disclosure describes flicker detection and correction techniques to improve the quality of captured imagery, such as video or still images. In particular, this disclosure describes flicker correction techniques that compare different image frames to detect flicker. In some embodiments, the comparison involves summing intensity values associated with rows within the frames and comparing the row sums to generate a difference signal. Detection and correction of flicker may be performed using a first derivative of the difference signal. The first derivative of the difference signal can be used in a variety of ways to detect and correct flicker.

One embodiment of the present invention sets forth a technique for reducing flicker in image frames captured with a rolling shutter. A flicker detection and correction engine selects a first channel from a first image frame for processing. The flicker detection and correction engine subtracts each pixel value in the first channel from a corresponding pixel value in a prior image frame to generate a difference image frame. The flicker detection and correction engine identifies a first alternating current (AC) component based on a discrete cosine transform (DCT) associated with the difference image frame. The flicker detection and correction engine reduces flicker that is present in the first image frame based on the first AC component. One advantage of the disclosed techniques is that the flicker resulting from fluctuating light sources is correctly detected and reduced or eliminated irrespective of the frequency of the fluctuating light source.

The invention relates to the technical field of image mosaicing, in particular to a method for mosaicing heterogeneous images and a system thereof. The method for mosaicing the heterogeneous images comprises the steps of mosaicing more than one pixel input stream, firstly saving each pixel input stream into a frame cache module, mosaicing each frame of data in a cache sub-module through a mosaicing device and sending to a user port, and the method further comprises the following steps: (1) detecting more than one pixel input stream of images generated by a display card, and determining the pixel input stream with slowest rate; (2) carrying out processing of reducing frame rate on the multiple pixel input streams according to information of the pixel input stream with the slowest rate, and getting multiple pixel input streams after frame-reducing processing; and (3) mosaicing the multiple pixel input streams after the frame-reducing processing, getting image data after mosaicing and frame-reducing processing and sending to the user port. By adopting the invention, the phenomena of screen flicker, instantaneous screen noise and the like during the mosaicing caused by inconsistent frame rates among the multiple pixel input streams can be effectively reduced.

The invention relates to a backlight display control device. The device comprises a communication interface module, a backlight coefficient calculation module, a scene change judgment module, a filtering module and a backlight display module, wherein the backlight coefficient calculation module calculates a backlight coefficient according to first image information of each frame of image from the communication interface module; the backlight coefficient comprises a plurality of backlight coefficient values corresponding to a plurality of image sections of each frame of image; and the scene change judgment module calculates the cumulative sum of absolute values of differences among the backlight coefficient values of the image sections of the current frame of image and the previous frame of image, determines that a scene is not changed and sends the backlight coefficient of the current frame of image to the backlight display module if the cumulative sum is smaller than a predetermined backlight threshold value, and determines that the scene is changed, sends the backlight coefficient of the current frame of image to the filtering module for processing, and sends the processed backlight coefficient to the backlight display module for backlight control if the cumulative sum is greater than the predetermined backlight threshold value. By the backlight display control device and a backlight display control method, flicker caused by too fast backlight change can be effectively controlled by adjusting the backlight coefficient in real time.

The invention relates to an electrode bridging connecting structure for inhibiting picture interference of a capacitance type touch screen. The electrode bridging connecting structure comprises a bottom connector made of a transparent conducting film, an insulating padding block arranged on the bottom connector, and an elongated connecting bridge being made of a metal film and bridging over the insulating padding block, wherein the bottom connector is used for connecting an electrode X extending along an X direction, the connecting bridge is used for connecting an electrode Y extending along a Y direction, and an inclined angel is formed by the extending direction and the Y direction of the connecting bridge. By the adoption of the electrode bridging connecting structure, the connecting bridge is prevented from covering all subpixels, therefore the color deviation of a pixel in which the subpixels exist is inhibited; when one subpixel is covered, adjacent pixels with different colors are covered partially; when the visual angel of eyes observing a picture changes slightly, the partial covering results in the transfer of the covered area among the subpixels in a gradually varied way, therefore the flicker of display pixels, which can be observed by naked eyes, can be avoided, and picture flicker can be reduced effectively.

A method, system and apparatus for detecting a sub-pixel pair susceptible of producing a flicker event in an image from a video signal source displayed on a liquid crystal display (LCD) unit is described. A two dimensional flicker pattern analysis is performed on a selected group of sub-pixels some of which are included in a first plurality of sub-pixels that includes a first current sub-pixel and a first next sub-pixel included in a first video frameline and a remainder of which are included in a second plurality of sub-pixels included in a second video frameline that is received, in real time, from the video signal source that includes a second current sub-pixel and a second current sub-pixel.

An imaging apparatus according to one embodiment of the present invention includes a flicker correction unit for correcting a flicker component using a correction gain. The flicker correction unit includes an integrating unit for calculating a line integrated value from a video signal in one horizontal line in one vertical synchronization period, a normalization unit for normalizing the line integrated value for a plurality of the vertical synchronization periods so as to calculate a normalized line integrated value, an inter-frame DFT processing unit for performing Discrete Fourier Transform on the normalized line integrated value for the plurality of vertical synchronization periods, a flicker component calculation unit for calculating information of a flicker component based on a Fourier Transform processing result, and a correction gain calculation unit for calculating a correction gain based on the information of the flicker component in two or more horizontal lines.