Abstract: A signal processing apparatus for a color printer capable of printing images based on analogue video signals and digital video signals. The apparatus varies at least one of a heating reference time, a number of consecutive heating reference times, and a number of recording element sub-lines based on a type of video signal forming the image to record an image within a predetermined time period.

Abstract: An image processing apparatus and method for performing color conversion on first image data of a first format to produce second image of a second format different from the first format. Each of the first and second image data represent a pixel of one of a stationary image and a moving image. The method and apparatus generate complementary color data from the first image data for each pixel of an image, determine a minimum and maximum value of the complementary color data, generate hue data representing a hue of each pixel of the image based on the complementary color data, the minimum value and the maximum value, and generate the second image data based on the hue.

Abstract: In an image processing system, an outline correction of image data and a smoothing for noise removal are performed. Generally, the outline correction is performed by emphasizing a high frequency component, and the smoothing is performed by removing the high frequency component. Within one image data, by properly switching the emphasizing and the removal of the high frequency component, while the outline correction is carried out, the noise removal can be performed. An absolute value of a high frequency component Fa extracted from the image data Pi by a first differential filter is compared with a discrimination threshold value K, and depending on the comparison result, either Fa or -Fa as the correction data Fo is selected by a selector and is added to the image data Pi. As a result, when Fo=Fa, the high frequency component is emphasized, and when Fo=-Fa, smoothing is performed. A pixel interpolation and a multi picture formation are also disclosed.

Abstract: A signal processing device for a video printer which is capable of eliminating white stripes attributed to the block division type drive of a thermal head. The signal processing device also performs aperture correction for correction of high frequency components and carries out color conversion with high precision. The video printer can produce a print having high density. Further, the changing of printing time and print size is available in the video printer.

Abstract: A signal processing device for a video printer which is capable of eliminating white stripes attributed to the block division type drive of a thermal head. The signal processing device also performs aperture correction for correction of high frequency components and carries out color conversion with high precision. The video printer can produce a print having high density. Further, the changing of printing time and print size is available in the video printer.

Abstract: An image printer for creating a hard copy of a television image or an image produced by computer graphic having a high image quality. The image printer is provided with an apparatus for driving a thermal printing head having a processor which does not permit heat to be produced continuously across the boundaries between adjacent picture elements and for controlling the blocks of the thermal printing head to print a subline divided from one scanning line and to repeat the subline printing to complete the printing of the one scanning line.

Abstract: An image printing device in which desired images represented by two or more valued data are recorded with a laser beam. This image printing device allows to employ a semiconductor laser which is relatively low in an output power resulting in reducing manufacturing cost and prolonging a service life of the device.

Abstract: An image printing device in which desired images represented by two or more valued data are recorded with a laser beam. This image printing device allows to employ a semiconductor laser which is relatively low in an output power resulting in reducing manufacturing cost and prolonging a service life of the device.

Abstract: A color converting device for converting R, G and B image signals representing red, green and blue colors, respectively, into a three color or four color printing data indicative of three colors of yellow, magenta and cyan or four colors of yellow, magenta, cyan and black, which device comprises a divider for dividing the image signals into achromatic and chromatic color components for each picture element; a first converter for converting the chromatic color components so divided into a first color conversion data Y1, N1 and C1 representative of the yellow, magenta and cyan colors, respectively; a second converter for converting the achromatic color component into a second color conversion data Y2, M2 and C2, or into a third color conversion data K; an adder for summing the first and second color conversion data Y1, M1, C1, Y2, M2 and C2 together to provide the three color printing data, or an output circuit for outputting both the first color conversion data Y1, M1 and C1 and a third color conversion data K

Abstract: A PCM signal is divided into groups each including S sampled values represented by B bits respectively and R code error check bits are added to each group to form one frame. The frames are successively and repeatedly recorded in N tracks on a recording medium with frame synchronizing signals each including M bits, the signals alternating the frame in each track. The frame synchronizing signal in each track delays the next track by m bits. The m satisfiesm = (B .times. S + R - m')/(N - 1) and M = m - m'Where m' designates the number of bits fully filling a temporal spacing between the end of the frame synchronizing signal in each track and the beginning of the next track.