A display apparatus according to the aspect of the embodiments includes a display unit configured to sequentially display a plurality of images based on a plurality of frames including a first frame and a second frame; and a control unit configured to control the display unit so as to display each frame with a display brightness according to a brightness of each frame, in which in a case that the second frame is to be subjected to predetermined image processing, the control unit controls the display unit such that an amount of change from a display brightness of the first frame to a display brightness of the second frame is not more than a predetermined threshold value.

A display apparatus according to the aspect of the embodiments includes a display unit configured to sequentially display a plurality of images based on a plurality of frames including a first frame and a second frame; and a control unit configured to control the display unit so as to display each frame with a display brightness according to a brightness of each frame, in which in a case that the second frame is to be subjected to predetermined image processing, the control unit controls the display unit such that an amount of change from a display brightness of the first frame to a display brightness of the second frame is not more than a predetermined threshold value.

A video processor includes a receiving section that receives video information representing video images and luminance-related information on the luminance of the video images and a video processing section that determines an expansion target luminance range of the video images based on the luminance-related information and expands the expansion target luminance range in such a way that the maximum luminance in the expansion target luminance range increases.

A video processor includes a receiving section that receives video information representing video images and luminance-related information on the luminance of the video images and a video processing section that determines an expansion target luminance range of the video images based on the luminance-related information and expands the expansion target luminance range in such a way that the maximum luminance in the expansion target luminance range increases.

A method for controlling an electronic apparatus includes determining representative colors of pixels of a received image frame; calculating input dynamic ranges for respective representative colors based on brightness information of the received image frame; expanding a dynamic range for the representative colors based on at least one of the brightness information of the received image frame and display characteristics of the electronic apparatus; and outputting an image frame having adjusted brightness based on the expanded dynamic range.

A display apparatus includes a liquid crystal panel, and a plurality of light sources irradiating the liquid crystal panel with light. The display apparatus inserts black signals during a predetermined period within respective frame periods in a plurality of image frames. The display apparatus respectively displays signals corresponding to the respective regions in each image frame into which the black signals are inserted, in respective regions of the liquid crystal panel irradiated with light by each of the light sources, in an order along an arrangement direction of the respective regions. The display apparatus respectively irradiates the respective regions with light by the light sources corresponding thereto, in a latter period within a period in which the corresponding signals are respectively displayed in the respective regions of the liquid crystal panel. In this case, the display apparatus reduces luminance of light from the light sources corresponding to the respective regions, in an order of respectively displaying the signals in the respective regions of the liquid crystal panel, corresponding thereto.

A videoconferencing system includes at least one processor and at least one camera. The endpoint can capture one or more images with the camera. The system can locate a region of interest within an image, such as the area surrounding the face of a person participating in a videoconference. If the face area or other region of interest is too dark, the system can brighten the region to make it more visible. The system can determine whether the face is too dark by comparing the captured image to previously captured images, or comparing the luma values and other data making up the face to predetermined values, or both. The system can check the modified image for over-brightening or saturation, and further adjust the image as needed. The brightening of the face area is done in such a way that the brightened region is unobtrusive to the viewer.

A videoconferencing system includes at least one processor and at least one camera. The endpoint can capture one or more images with the camera. The system can locate a region of interest within an image, such as the area surrounding the face of a person participating in a videoconference. If the face area or other region of interest is too dark, the system can brighten the region to make it more visible. The system can determine whether the face is too dark by comparing the captured image to previously captured images, or comparing the luma values and other data making up the face to predetermined values, or both. The system can check the modified image for over-brightening or saturation, and further adjust the image as needed. The brightening of the face area is done in such a way that the brightened region is unobtrusive to the viewer.

For obtaining good quality luminance dynamic range conversion, we describe an image color processing apparatus (200) arranged to transform an input color (R,G,B) of a pixel of an input image (Im_R2) having a first luminance dynamic range into an output color (Rs, Gs, Bs) of a pixel of an output image (Im_res) having a second luminance dynamic range, which first and second dynamic ranges differ in extent by at least a multiplicative factor 1.5, comprising: a maximum calculation unit (201) arranged to calculate the maximum (M) of at least three components of the input color; a brightness mapper (202) arranged to apply a function (F) to the maximum, yielding an output value (F(M)), whereby the function is predetermined having a constraint that the output value for the highest value of the maximum (M) cannot be higher than 1.0; a scaling parameter calculator (203) arranged to calculate a scaling parameter (a) being equal to the output value F(M)) divided by the maximum (M); and a multiplier (204) arranged to multiply the three color components of the input color (R,G,B) by the scaling parameter (a), yielding the color components of the output color, wherein the color processing apparatus (200) comprises at least one component multiplier (303) arranged to multiply a component (B) of the input color with a weight (wB) being a real number yielding a scaled component (Bw) prior to input of that component in the maximum calculation unit (201).

For obtaining good quality luminance dynamic range conversion, we describe an image color processing apparatus (200) arranged to transform an input color (R,G,B) of a pixel of an input image (Im_R2) having a first luminance dynamic range into an output color (Rs, Gs, Bs) of a pixel of an output image (Im_res) having a second luminance dynamic range, which first and second dynamic ranges differ in extent by at least a multiplicative factor 1.5, comprising: a maximum calculation unit (201) arranged to calculate the maximum (M) of at least three components of the input color; a brightness mapper (202) arranged to apply a function (F) to the maximum, yielding an output value (F(M)), whereby the function is predetermined having a constraint that the output value for the highest value of the maximum (M) cannot be higher than 1.0; a scaling parameter calculator (203) arranged to calculate a scaling parameter (a) being equal to the output value F(M)) divided by the maximum (M); and a multiplier (204) arranged to multiply the three color components of the input color (R,G,B) by the scaling parameter (a), yielding the color components of the output color, wherein the color processing apparatus (200) comprises at least one component multiplier (303) arranged to multiply a component (B) of the input color with a weight (wB) being a real number yielding a scaled component (Bw) prior to input of that component in the maximum calculation unit (201).