Abstract: An on-screen display (OSD) signal generating circuit which provides an analog output is utilized for realizing on-screen display of a digital display device and providing stable operations and signals. An OSD signal processing device has an OSD signal generating circuit which outputs an analog OSD signal in the form of a current and a resistor which has its one end connected to the output terminal of the OSD signal generating circuit and its other end connected to ground to convert a current signal into a voltage signal. In an analog-to-digital converter the input terminal of which is connected to the output terminal of the OSD signal generating circuit, the sampling upper- and lower-limiting voltages of a signal applied to the input terminal are defined by a power source voltage and ground potential, respectively.

Abstract: According to one embodiment, a picture signal processing apparatus comprises an acquisition unit which acquires histogram data on each luminance level from luminance signals for one frame, a frequency converter unit which eliminates histogram data that corresponds to a no-image portion displayed so as to occupy a predetermined region in a screen from among the acquired histogram data, a creation unit which creates a nonlinear correction processing table for applying a nonlinear correction processing to the input luminance signal on the basis of the histogram data subjected to a frequency conversion processing, and a processing unit which applies a nonlinear correction processing to the input luminance signal on the basis of the created nonlinear correction processing table.

Abstract: According to one embodiment, a video signal processing apparatus includes an obtaining unit which obtains histogram data for each luminance level of one frame of a luminance signal, a frequency distribution unit which distributes a frequency of a histogram data among the obtained histogram data, the histogram data being greater than a predetermined value, in a luminance level range which is set in advance for each luminance level, and adds the distributed frequency to the original histogram data and thereby obtains corrected histogram data, and a creation unit which creates a table for a nonlinear correction process to be used when performing a nonlinear correction process on the luminance signal based on the corrected histogram data.

Abstract: According to one embodiment, histogram data on each of luminance levels is acquired from an input luminance signal for one frame portion, and degree conversion processing is performed to the acquired histogram data on the basis of a conversion parameter which enables designating a histogram on each luminance level. Then, on the basis of the histogram data subjected to the degree conversion, a table for performing a non-linear correction processing to the input luminance signal is created, and a non-linear correction processing is performed to the input luminance signal on the basis of the created table.

Abstract: According to one embodiment, in the case where a non-linear correction processing is performed in a direction in which an amplitude level of a luminance signal is heightened, an amplitude level correction processing is performed to a color signal on the basis of a first coefficient read from a first table prepared in advance in correspondence to the case. In the case where a non-linear correction processing is performed in a direction in which the amplitude level of the luminance signal is lowered, an amplitude level correction processing is performed to the color signal on the basis of a second coefficient read from a second table prepared in advance in correspondence to the case.

Abstract: In the event that the maximum Imax of R, G, B color signals is detected and the maximum value Imax is equal to or higher than the suppression start level Vcs which is lower than a predetermined level to be restricted, a suppression gain is generated in accordance with the value of this maximum Imax, and by this suppression gain Gc, R, G, B color signals to be inputted are simultaneously suppressed. By this, color signals can be restricted to the predetermined range and outputted without impairing white balance.

Abstract: Based on a first table in which a value of an input luminance signal is corresponded to a value of an output luminance signal acquired by performing nonlinear correction processing on the input luminance signal, there is created a second table in which a value of the input luminance signal is corresponded to a value of a color correction signal for performing amplitude control based on the nonlinear correction processing performed on the input luminance signal on an input color signal. The nonlinear correction processing is performed on the input luminance signal based on the first table and the amplitude control is performed on the input color signal based on the second table.

Abstract: The present invention comprises a coring value generator unit configured to generate a coring value in accordance with changes, a contour correction signal generator unit which generates contour correction signals by calculating the quadratic differential signals from the video signals, carrying out nonlinear processing including restricting amplitudes, coring and gain adjustment for the calculated quadratic differential signals and is configured to carry out the coring by the coring value from the coring value generator unit, and an output unit configured to add the contour correction signals generated by the contour correction signal generator unit to the video signals and output the added signals.

Abstract: According to this invention, a video signal processing apparatus inputs an HD video signal or SD up-conversion video signal in an HD format, and includes the first and second second-derivative calculation circuits which respectively calculate the first and second second-derivative signals each of which has a pixel frequency suitable for each signal, an SD/HD video signal detection circuit which detects whether the input video signal is the HD video signal or the SD up-conversion video signal, and a control unit which controls the gain of the first and second second-derivative signals on the basis of the determination result of this SD/HD video signal detection circuit. The gain-controlled first and second second-derivative signals are added to generate a second-derivative signal for contour correction.

Abstract: An amplitude discrimination circuit separates a received video signal into a signal component with a minute amplitude level and other signal component with a high amplitude level. A contour correction circuit performs contour correction processing on a signal with the high amplitude level and a nonlinear processing circuit performs nonlinear processing after adding the signal with high amplitude level to an output from a delay circuit which delays the received video signal by the time required for the contour correction processing performed by the contour correction circuit. A minute amplitude contour correction circuit performs contour correction processing on the signal with the minute amplitude level and an adder circuit adds the signal with the minute amplitude level to an output from the nonlinear processing circuit after delaying the signal with the minute amplitude level by the time required for the nonlinear processing performed by a delay circuit.

Abstract: An on-screen display (OSD) signal generating circuit which provides an analog output is utilized for realizing on-screen display of a digital display device and providing stable operations and signals. An OSD signal processing device has an OSD signal generating circuit which outputs an analog OSD signal in the form of a current and a resistor which has its one end connected to the output terminal of the OSD signal generating circuit and its other end connected to ground to convert a current signal into a voltage signal. In an analog-to-digital converter the input terminal of which is connected to the output terminal of the OSD signal generating circuit, the sampling upper- and lower-limiting voltages of a signal applied to the input terminal are defined by a power source voltage and ground potential, respectively.

Abstract: The gradation representation capability is automatically controlled according to gradation regions and properties (moving or still image) of an input video signal. In a gradation representation pattern information storage circuit is stored a plurality of pieces of gradation representation pattern information which are different in the number of repetition unit frames for gradation representation according to a plurality of degradation regions. One piece of gradation representation pattern information stored in the gradation representation pattern information storage circuit is selected according to a gradation region detected from an input video signal. Gradation representation data of the frame rate corresponding to the selected gradation representation pattern information is output.