摘要:
A specified color area demarcation circuit 6 has a luminance information (histogram) acquisition unit 3 for multiple pixels and a luminance information (histogram) analysis unit 5 for the multiple pixels. The luminance information (histogram) acquisition unit 3 for the multiple pixels acquires luminance information of the multiple pixels in an input image. In order to acquire the luminance information of the multiple pixels, the luminance information (histogram) acquisition unit 3 creates, for example, a histogram of the luminance indicating frequencies. As an example of the histogram, 0 to 255 gray levels in an image are divided into thirty-two (0-7, 8-15, . . . 240-247, 247-255) ranges, and the number of pixels present in each of the divided gray levels (luminance Y) is counted. In order to extract the feature value of the luminance information of the multiple pixels in the input image, the luminance information analysis unit 5 analyzes, for example, the histogram of the luminance values of the multiple pixels to extract the feature value representing a feature of the histogram. On the basis of the feature value, the luminance information analysis unit 5 obtains the coefficient for demarcating the specified color area. Thereby, it is possible to display an image of the specified color area with high precision.
摘要:
In an X-Y conversion chart, a threshold Th is defined as Y=0, that is, defined on the X axis, a range from −Th to +Th is defined as a range in which smoothing processing is performed, and a range outside −Th to +Th is defined as a range in which sharpening processing is performed. Among equations denoted by Y1 and Y2 expressed by two linear straight lines, intersections of both the equations Y1 and Y2 are set to the maximum value and the minimum value of an X-Y conversion equation in this case. The threshold is expressed by an intersection of Y2 and the X axis. This algorithm is formed by three factors of: a coefficient α indicating the strength of smoothing; a coefficient β indicating the strength of sharpening; and a threshold Th on the X axis for determining switching between the smoothing processing and the sharpening processing.
摘要:
In an X-Y conversion chart, a threshold Th is defined as Y=0, that is, the threshold Th is defined on the X axis, a range from −Th to +Th is defined as a range in which smoothing (noise elimination) processing is performed, and a range outside the range from −Th to +Th is defined as a range in which sharpening processing is performed. As shown in equations in drawings, among equations denoted by Y1 and Y2 which are expressed by two linear straight lines, intersections of both the equations Y1 and Y2 are set to the maximum value and the minimum value of an X-Y conversion equation in this case. In addition, the threshold is expressed by an intersection of Y2 and the X axis. This conversion algorithm is formed by only three factors of: a coefficient α indicating the strength of smoothing; a coefficient β indicating the strength of sharpening; and a threshold Th on the X axis for determining switching between the smoothing processing and the sharpening processing. Accordingly, it is possible to reduce the number of parameters for use and to keep the continuity of a smoothing input-output characteristic and a sharpening input-output characteristic even after one of the parameters is adjusted.
摘要:
Shown is a diagram showing input-output characteristics for color adjustment. The horizontal axis represents an input, and the vertical axis represents an output. In this color adjustment technique, first, so as to prevent degradation the luminance of white after white correction, correction coefficients are determined so that the smallest value thereof may be 1. Note that “1” here is not a strict value. To be more specific, in contrast to the conventional technique in which correction is performed with the largest value being made equal to about “1,” the present embodiments sets the smallest value at about “1.” This idea itself is a first point which makes the embodiments different from the conventional technique. When doing so, all the correction coefficients are “1” or larger. In the case where a correction coefficient is “1” or larger, when the input is large, the output is saturated. To prevent the saturation, the saturation suppressed using an n-degree curve (Xucurve) which is, for example, a quadratic curve or a cubic curve. If doing so, degradation in the maximum luminance due to correction processing can be suppressed while the hue of white is maintained in a practical luminance range (0 to 70%) for video images of a television receiving set (TV), or the like. Thereby, degradation in the maximum luminance due to correction processing can be suppressed while the hue of white is maintained.
摘要:
Shown is a diagram showing input-output characteristics for color adjustment. The horizontal axis represents an input, and the vertical axis represents an output. In this color adjustment technique, first, so as to prevent degradation the luminance of white after white correction, correction coefficients are determined so that the smallest value thereof may be 1. Note that “1” here is not a strict value. To be more specific, in contrast to the conventional technique in which correction is performed with the largest value being made equal to about “1,” the present embodiments sets the smallest value at about “1.” This idea itself is a first point which makes the embodiments different from the conventional technique. When doing so, all the correction coefficients are “1” or larger. In the case where a correction coefficient is “1” or larger, when the input is large, the output is saturated. To prevent the saturation, the saturation suppressed using an n-degree curve (Xucurve) which is, for example, a quadratic curve or a cubic curve. If doing so, degradation in the maximum luminance due to correction processing can be suppressed while the hue of white is maintained in a practical luminance range (0 to 70%) for video images of a television receiving set (TV), or the like. Thereby, degradation in the maximum luminance due to correction processing can be suppressed while the hue of white is maintained.
摘要:
With a pixel included in image data as a reference pixel, a pixel that shares the same pixel value as the reference pixel or a pixel similar to the reference pixel is judged as a shared pixel, and for the pixel judged as the shared pixel, color of the reference pixel is regarded as a color judgment result of the shared pixel, thus making it possible to reduce color calculation processing for the shared pixel. This makes it possible to provide a color judging apparatus operating at higher speed and the like. Thereby, it is possible to provide the color judging apparatus operable at high speed and the like by reducing the number of times of the color calculation processing executed for an input image.
摘要:
With a pixel included in image data as a reference pixel, a pixel that shares the same pixel value as the reference pixel or a pixel similar to the reference pixel is judged as a shared pixel, and for the pixel judged as the shared pixel, color of the reference pixel is regarded as a color judgment result of the shared pixel, thus making it possible to reduce color calculation processing for the shared pixel. This makes it possible to provide a color judging apparatus operating at higher speed and the like. Thereby, it is possible to provide the color judging apparatus operable at high speed and the like by reducing the number of times of the color calculation processing executed for an input image.
摘要:
An image display (A) comprises a display unit (1) such as a liquid crystal panel, a light source (3) such as a backlight, a light source control section (5), a video signal processing section (7) for outputting a signal to control the display unit in accordance with an input signal (S1), and a control section (11) for controlling the whole including light source control and video image control. The control section (11) has a video-image analyzing block (15) for analyzing a video image on the basis of the input signal (S1), a target value setting block (17) for setting a target value of an amount of light generated by the light source upon receiving an analysis result (S2), and a controlled-amount determining block (21) for, upon receiving a target value (S3), determining a speed at which the light source is controlled, and for outputting a compensation parameter (S4) to the video signal processing section (7) while notifying the light source control section of a set luminance (S5). On receiving the set luminance value (S5), the light source control section (5) outputs a light amount control signal (S6) to the light source. Thereby, a technique which is capable of reducing power consumption in image display without causing any visual discomfort can be provided.
摘要:
The fact that B and R are close to a U axis and to a V axis, respectively, is noted. On that basis, from an example of color adjustment parameters set in directions of colors, it is found out that, when inputted V is in a negative range, B has a small influence. Accordingly, a B component is omitted from calculation in order to reduce a calculation amount. Similarly, components having small influences are omitted when B is in a positive range, when U is in the positive range, and when U is in the negative range. Thereby, adjustment parameters AR, AG, and AB set in directions shown in the drawing can be defined. When inputted V is in the positive range, a V component can be adjusted by multiplying AR by the inputted V. Similar processing is performed when inputted V is in the negative range, when U is in the positive range, and when U is the negative range, respectively. With this taken into consideration by setting values of the adjustment parameters for respective RGB larger than 1 or smaller than 1, color transformation processing for adjusting darkness/lightness of colors can be performed, independently of brightness, so as to bring values of U and V close toward a color component to be increase in intensity. This allows reduction in load of color transformation processing.
摘要:
The fact that B and R are close to a U axis and to a V axis, respectively, is noted. On that basis, from an example of color adjustment parameters set in directions of colors, it is found out that, when inputted V is in a negative range, B has a small influence. Accordingly, a B component is omitted from calculation in order to reduce a calculation amount. Similarly, components having small influences are omitted when B is in a positive range, when U is in the positive range, and when U is in the negative range. Thereby, adjustment parameters AR, AG, and AB set in directions shown in the drawing can be defined. When inputted V is in the positive range, a V component can be adjusted by multiplying AR by the inputted V. Similar processing is performed when inputted V is in the negative range, when U is in the positive range, and when U is the negative range, respectively. With this taken into consideration by setting values of the adjustment parameters for respective RGB larger than 1 or smaller than 1, color transformation processing for adjusting darkness/lightness of colors can be performed, independently of brightness, so as to bring values of U and V close toward a color component to be increase in intensity. This allows reduction in load of color transformation processing.