JPS6298983A - Imaging device - Google Patents

Abstract

PURPOSE:To enable automation by providing an AND circuit for ANDing all outputs of (n) bits of a data buffer, deciding whether an input video signal is a standard NTSC system or not, and changing over automatically a data processing method to image in accordance with this result. CONSTITUTION:There are provided a field decision circuit 5 in which the change over of a signal synchronizes with a vertical synchronizing signal, a field inversion F.F circuit 6 for repeating the inversion of a level in synchronizing with the vertical synchronizing signal at every field, a comparison circuit 7 for comparing the output of the field decision circuit with the output of the field inversion F.F circuit and outputting signals of different levels in accordance with the coincidence and the incoincidence, the data buffer 8 for latching the output of the comparison circuit of every vertical synchronizing signal and storing in a shift register of the (n) bits and the AND circuit 9 for ANDing all the outputs of the (n) bits of the data buffer. According to the output of the AND circuit, in the case of field data, the imaging is carried out by pseudo frame data and in the case of the frame data, the imaging is performed by the frame data as it is. Thereby, the change over can be automatically carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing apparatus that uses a video signal as an input source.

[Prior art]

There are few practical examples of printing devices that use all video signal input sources.
The printing method differs depending on whether the video signal is a moving image or a still image.

If it is a moving image, it has a memo IJ-, which includes the sampling frequency, number of quantization bits, and number of horizontal scanning lines, and when storing it in memory, it uses a high-speed A/D converter and stores it within a frame period or a field period. A method is used in which the data is stored (-1) and sequentially read out from the memory when printing.

Even in the case of still images, a method of having frame (shortly field) memory is sometimes used, but the video signal itself is regarded as the memory, the printing speed is fully synchronized with the scanning speed of the video signal, and sampling and printing are performed sequentially. An iterative method is used. Also, there are two sampling methods, one in the vertical scanning direction and the other in the horizontal scanning direction.

[Problem that the invention seeks to solve]

When printing using a video signal as an input source, the question is whether the source is interlaced scanning or non-interlaced scanning. The standard NTSC system uses interlaced scanning, but video output from personal computers and the like generally uses non-interlaced scanning. In addition, although there are VTR still images whose image quality has been significantly improved in recent years, VTR still images are often field images, and there is no guarantee that the composite synchronization signal will be sent normally.

When processing and printing data from such various sources, if only field data is handled, if a standard NTSC video signal is input, half of the original data will be used. Becomes bones,
Mainly vertical resolution degradation? -1〈. On the other hand, if processing is performed assuming that frame data exists, if a still image from a VTR is input, field determination may not be possible, or due to field misjudgment, odd and even fields may be reversed and printed. something happens.

Therefore, in the present invention, it is determined whether the input video signal has odd and even field divisions, and based on the result, if only field data exists, it is better than the field data. The purpose of the present invention is to provide a printing device that generates pseudo frame data through interpolation processing, performs printing, and when frame data exists, automatically switches to perform printing with a sufficiently wide vertical resolution. .

[Means for solving problems]

The printing apparatus of the present invention includes a sync separation circuit that separates a composite sync signal from a composite video signal, a horizontal sync circuit that outputs a horizontal sync signal synchronized with the horizontal sync of the composite sync signal, and a horizontal sync circuit that integrates the composite sync signal. a vertical synchronization circuit that outputs a vertical synchronization signal that can be obtained by
A field determination circuit outputs signals of different levels depending on odd and even fields, and switches signals in synchronization with the vertical synchronization signal, and inverts the level for each field in synchronization with the vertical synchronization signal. a repeating field inversion F-F circuit; a comparison circuit that compares the output of the field determination circuit with the output of the field inversion F-F circuit; and outputs signals of different levels depending on whether they match or do not match; and the comparison circuit. a data buffer that latches the output of each vertical synchronization signal and stores it in an n-bit shift register; and an AND circuit that takes an AND of all outputs of n pits of the data buffer; Based on the output of , it is determined whether only field data or frame data exists. In the case of field data, all printing is performed using pseudo frame data, and in the case of frame data, printing is performed with the frame data as is. It is characterized by doing the following.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which 1 is a composite video signal, 2 is a sync separation circuit, 3 is a horizontal sync circuit, 4 is a vertical sync circuit, 5 is a field determination circuit, and 6 is a field inversion F-F. 7 is a comparison circuit, 8 is a data buffer, 9 is an AND circuit, and 10 is a data processing circuit.

The input video signal 1Fi is turned into a composite synchronization signal by the synchronization separation circuit 2. The horizontal synchronization circuit 3 outputs a companion horizontal synchronization signal in synchronization with the horizontal synchronization of the composite synchronization signal, and the vertical synchronization circuit 4 extracts the vertical synchronization of the composite synchronization signal by integrating the composite synchronization signal. A composite synchronization signal conforming to the standard NTSC system has an equivalent pulse and a notch bulk in the vertical synchronization part, and the distinction between odd and even fields is made by the signal of this part. The field determination circuit 5 performs the discrimination between odd and even fields using a full composite synchronization signal and a horizontal synchronization signal, and synchronizes the H level signal in the case of an odd field and the L level signal in the case of an even field with the vertical synchronization signal. Switch levels. The field inversion F/F circuit 6\'i loads the output of the field determination circuit at regular intervals and repeats level inversion for each vertical synchronization signal. The comparison circuit 7 performs an exclusive OR of the output of the field determination circuit and the output of the field circuit. As shown in Figure 2, the input video signal is standard NTS
If it is a C format video signal, the output F of the field determination circuit
J repeats inversion of the H and L levels for each field. Furthermore, since the field inversion FF circuit loads the output of the field determination circuit at regular intervals, the output FT of the field inversion F.2 circuit should operate exactly the same as the FJ. Therefore, the output C8 of the comparison circuit always shows an H level. If the input video signal is not in the standard NTSC format, the FJ will not repeat the level reversal at each vertical sync and will behave erratically. Assume now that the particular operation shown in FIG. 5 has been completed. Regardless of the input video signal, the FT repeats the inversion of H and L levels at each vertical synchronization, so as shown in Figure 3, C8 does not continue to show a constant level and operates irregularly. . The data buffer 8 has an n-bit shift register,
The output C8 of the comparator circuit is input, and the vertical synchronization signal? Use as a trigger to shift data. In other words, the n-bit data output can be said to be the history of the outputs of the comparator circuit for n fields. The AND circuit 9 is connected to the n of the data buffer 8.
AND all outputs of bits. Let n=4, the output of the data buffer k D T (i), and the output ThAD of the AND circuit. In the case of Figure 2, DT(1)=H, DT(2)=H, DT(3)=H, D
T(4)=HAD=T (In the case of Figure 3, DT(1)=L, DT(2)=L, DT(3)=L
, DT(4)=LAD=L In the case of FIG. 2, the input video signal is of standard NTSC format, and the AND circuit indicates H. In the case of Figure 5, the input video signal is not the standard NTSC system, and the AND circuit is L?
show. In this way, the input signal can be correctly determined according to the standard ``NTSC NTSC method.The data processing section 12 has a field data processing function and a frame data processing function, and if the output of the OR circuit is L, the field data processing function The video signal is sampled completely and printed, and if the output of the OR circuit is H, the video signal is sampled +1 by the frame data processing function and printed.

The frame data processing function is a function that converts everything within one frame into data and prints without any deterioration of vertical resolution.The field data processing function is
Data within one field? , water trench 1 is a function that creates pseudo frame data through interpolation and prints with the same data number as the frame data.0 [Effects of the Invention] As stated above, the present invention According to the company, no matter what type of input video signal it is, it automatically determines whether the input signal conforms to the standard NTSC format, changes the data processing method according to the result, and prints the image. You will be able to do this. In other words, with an NTSC standard video signal, all of the data of one frame is printed, and in the case of a still image from a VTR, the data of one field is printed! This has the effect of automatically switching between printing using false frame data or interpolated pseudo frame data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. FIGS. 2 and 3 are timing charts for explaining the present invention in detail. that's all

Claims (1)

[Claims] a sync separation circuit that separates a composite sync signal from a composite video signal; a horizontal sync circuit that outputs a horizontal sync signal synchronized with the horizontal sync of the composite sync signal; a vertical synchronization circuit that outputs a synchronization signal; a field determination circuit that outputs signals of different levels depending on odd and even fields; and a field determination circuit that outputs signals in synchronization with the vertical synchronization signal; a field inversion F/F circuit that loads the output of the field determination circuit and repeats level inversion for each field in synchronization with the vertical synchronization; and an output of the field determination circuit and the field inversion output. a comparison circuit that takes the exclusive OR of the data, a data buffer that latches the output of the comparison circuit for each of the vertical synchronization signals and stores it in an n-bit shift register, and a logical product of all n-bit outputs of the data buffer. What is claimed is: 1. A printing device comprising an AND circuit that determines whether an input video signal is in the standard NTSC system, and automatically switches a data processing method and performs printing according to the result.