Abstract: A method and apparatus for processing a digital image to be displayed on a display panel illuminated with a backlight module. The backlight module is set to a specific backlight duty according to a luminance statistic of the digital image. The digital image is remapped through a tone mapping function formed according to the specific backlight duty and the luminance statistic.

Abstract: A scanner including a light source, an optical module, a driving device, and a control unit is provided. The light source emits a light beam to the to-be-scanned document. The optical module includes a photo sensing device for receiving the light beam reflected by the to-be-scanned document. The driving device includes a position detecting device, for detecting a position of the optical module relative to the to-be-scanned document, and outputting a position feedback signal accordingly. The control unit includes a light source controller and a timer. The scanning method includes the steps of setting the value of K to 1; moving the optical module to read the Kth scan line and adjusting the luminance of the light source to compensate exposure level of the (K+1)th scan line; and determining if K is smaller than N.

Abstract: A scanner includes a scan flatbed, an optical module, a driving source, and an exposure control unit. The scan flatbed is for carrying a to-be-scanned document. The optical module includes a photo sensing device, for reading N scan lines of the to-be-scanned document. The driving source, used for driving the optical module, includes an encoder for outputting a position signal corresponding to a position of the optical module. The exposure control unit, including a timer, controls exposure time for each scan line to be constant according to the position signal. The scan method includes driving the optical module to read the scan lines of the to-be-scanned document and output the corresponding position signal; and controlling the photo sensing device to read each scan line of the to-be-scanned document for a constant period of time according to the position signal.

Abstract: A gamma reference voltage generating system and method adaptable for backlight control is disclosed. A gamma reference voltage generator adaptively generates an analog gamma reference voltage under the control of a digital control signal. The digital control signal is specifically arranged to accordingly level-up an upper limit of a gamma curve, thereby improving brightness loss.

Abstract: A backlight control system and method are disclosed. An overdrive device modifies a backlight duty signal according to a current-frame backlight duty signal and a previous-frame backlight duty signal. In one embodiment, the overdrive device is implemented with a lookup table that outputs the modified backlight duty signal. The backlight driven by the modified backlight duty signal then emits light to a display panel, thereby increasing a response time of the backlight.

Abstract: An overdrive system adaptable for a dynamic gamma generator is disclosed. A current gray-to-voltage converter (G/V) converts image data of a current frame from gray code to voltage level, and a previous gray-to-voltage converter (G/V) converts image data of a previous frame from gray code to voltage level. The voltage level of current frame and the voltage level of previous frame are inputted to an overdrive-voltage lookup table to retrieve an overdrive voltage level. Afterwards, a voltage-to-gray converter (V/G) converts the retrieved overdrive voltage level from voltage level back to gray code, resulting in an overdrive gray code. Accordingly, the overdrive gray code is compensated. Alternatively, the overdrive gray code is used to update an overdrive-gray-code lookup table, an output gray code of which is fed to the source driver.

Abstract: A method for simultaneously capturing images of multiple areas is applied to an image processing device. The method includes scanning a document and obtaining a preview image of the document; providing N scan windows for selecting N to-be-scanned areas from the preview image, wherein N is an integer; setting N scan resolutions respectively for the N scan windows; scanning the document; and outputting N scan images corresponding to the N scan windows according to N frequencies of a timing signal corresponding to the N scan resolutions.

Abstract: A backlight controller, a display device using the same and a method for controlling a backlight module are provided. The backlight controller includes a temporal weighting module and a dimming controlling module. The temporal weighting module calculates a weight sum of a first backlight luminance provided in a current frame and a target backlight luminance to serve as an adjusted backlight luminance. The target backlight luminance is obtained according to an image content of the current frame. The dimming controlling module increases or decreases the adjusted backlight luminance by a step value according to the target backlight luminance and generates a second backlight luminance provided in a next frame. Therefore, a backlight luminance of the backlight module not only can be smoothly adjusted to the target backlight luminance at high speed for avoiding backlight flicker, but also can be adaptive to image content for saving electric power consumption.

Abstract: A method for separating luminance and chrominance of a composite TV analog signal includes the steps of: measuring first differences between horizontal neighbor pixels, second differences between vertical neighbor pixels and third differences between temporal neighbor pixels encoded in the composite TV analog signal; comparing the first, second and third differences with one another to obtain a minimum difference used as a factor of a weighting function; and filtering the composite TV analog signal simultaneously by a two-dimensional (2D) comb filter and a three-dimensional (3D) comb filter according to the weighting function on the basis of the minimum difference to obtain a luminance signal and a chrominance signal, in which magnitudes of a part of the composite TV analog signal filtered by the 2D comb filter and magnitudes of the other part of the composite TV analog signal filtered by the 3D comb filter are determined by the weighting function.

Abstract: A content-adaptive adjustment system and method for a light-emitting display is disclosed. An analysis unit analyzes, for example, the average data intensity/power consumption and the data distribution of the image data to be displayed. An adjustment unit then adjusts, for example, the pixel values of the image data or the drive levels of the light-emitting display according to the analyzed data distribution, such that the consumed power in the light-emitting display could be considerably reduced.

Abstract: The invention provides image display panels. The image display panel comprises a histogram generator, a tone slope generator, and an image transformer. The histogram generator receives an original image, counts the pixels of different gray levels to generate a histogram distribution of the original image, and compares the pixel counts at every gray level with a first threshold count to identify the peaks of the histogram distribution. The tone slope generator generates a tone slope based on the histogram distribution and peaks of the histogram distribution. The image transformer transforms the original image into a modified image based on the tone slope.

Abstract: A method for adaptively adjusting image and an image processing apparatus using the same are provided. The apparatus includes a statistics apparatus and an image adjustment apparatus. The statistics apparatus receives a plurality of pixels in an image to generate a gray-level distribution of the pixels and searches a specific gray-level according to the gray-level distribution, in which a specific percentage of pixels have gray-levels smaller than the specific gray-level. The image adjustment apparatus adjusts the image according to the specific gray-level.

Abstract: An image processing method of backlight illumination control is provided herein. First, an image including a plurality of pixels is received, wherein a first function is a relation between a gray-level value of one of the pixels and a displaying illumination of a backlight. The first function is compared with a characteristic function to obtain the specific function, wherein the characteristic function is a relation between the gray-level value and a predetermined displaying illumination of the backlight, and the specific function is a relation between the gray-level value and a remapped gray-level value. The specific function is utilized to remap the gray-level -value so as to adjust the displaying illumination. Therefore, the present invention enhances the displaying illumination for better visual quality.

Abstract: A duplex scanner comprising a first scanning module, a second scanning module, a transmission mechanism, a power source and a control processing unit is provided. The first scanning module scans a front side of a to-be-scanned document and captures a front side image of the to-be-scanned document. The second scanning module scans a back side of the to-be-scanned document and captures a back side image of the to-be-scanned document. The transmission mechanism moves the to-be-scanned document relatively to the first scanning module and the second scanning module. The power source outputs at least a feedback signal while driving the transmission mechanism. The control processing unit receives a scan command and accordingly controls the power source to drive the transmission mechanism. The control processing unit receives the feedback signal and accordingly controls the first scanning module and the second scanning module to proceed duplex scan.

Abstract: A digital image tone remapping method is disclosed. The method includes computing an average luminance value of a digital image; generating a preliminary tone mapping function according to the average luminance value; generating a luminance statistic of the digital image; determining new remapped values for a plurality of skeleton luminance values according to the preliminary tone mapping function and the luminance statistic; generating a final tone mapping function according to the new remapped values and the plurality of skeleton luminance values; and remapping the digital image through the final tone mapping function. The present invention also discloses an apparatus performing the method.

Abstract: A method of image processing and a device thereof are provided in the present invention. First, an image having a plurality of regions is received, wherein each region comprises a plurality of pixels. A contrast process is performed on each region and a respective local curve of each region is analyzed, wherein the local curve is a corresponding relation between the gray-level values of the pixels in each region before and after the contrast process. Next, the gray-level value of one of the pixels in a boundary between one of the regions and the neighboring region is adjusted according to the respective local curves of the one of the regions and the neighboring region. The local contrast process towards to each region is performed for enhancing the image. Therefore, not only can the features be obvious, but the non-uniform area in the boundary between the regions also can be smoothed.

Abstract: An image processing method applied in an image processor for processing an image including first pixels each having a pixel value, a first reference pixel value representing a mean value of the pixel values of the first pixels, the pixel values of the first pixels being distributed within a first distribution range bounded between a second reference pixel value and a third reference pixel value. Second pixels are selected from the first pixels. The pixel values of the second pixels are distributed within a second distribution range. The second distribution range of the second pixels is smaller than the first distribution range of the first pixels. A local characteristic of the image is obtained according to the second pixels. A parameter of the image is adjusted according to the local characteristic.

Abstract: A method and an apparatus for adjusting a display parameter are provided. The method includes the steps of: (a) calculating a scene change value between a current frame and a previous frame; (b) setting a first weight according to the scene change value; (c) calculating an original parameter of the current frame; (d) providing a display parameter of the previous frame; (e) calculating a display parameter of the current frame according to the first weight, the original parameter, and the display parameter of the previous frame.

Abstract: An apparatus and a method for dynamic backlight-control in an electronic device are provided. The apparatus includes a battery power-level detection unit and a controlling unit. The battery power-level detection unit is used for detecting the power level of a battery in the electronic device. The controlling unit is coupled to a backlight unit of a display device in the electronic device and the battery power-level detection unit for adjusting the illumination of the backlight unit according to the power level of the battery and an image-content lightness of an image inputted into the display device.

Abstract: A method and apparatus for processing a digital image to be displayed on a display panel illuminated with a backlight module. The backlight module is set to a specific backlight duty according to a luminance statistic of the digital image. The digital image is remapped through a tone mapping function formed according to the specific backlight duty and the luminance statistic.