JPS62287788A - Film scanner for television - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 6. DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a television film scanning device according to the generic concept of claim 1.

PRIOR ART Such a television film scanning device is known, for example from DE 28 29 607 A1, with which the conventional time-related information can be determined from a running image film. It is possible to extract television video signals that comply with television standards.

In order to improve the television picture @ generated according to such current television standards, in recent years, in particular, for example, color television cameras, film scanners (
For studio equipment such as running equipment) and monitors, the location is 31y.
Research in the field of HDTv (high-definition television) is actively being conducted. Therefore, the conventional television film scanning device (scanner), which is equipped with six semiconductor wire sensors for normal, red, green, and evening color, has been adapted to the current HDTV standard recommendations. This would require many times more bandwidth than current television systems. In addition to the cost involved, there is also the difficulty of using a semiconductor wire sensor with a large pixel count that must be driven at a high bit rate that is currently unmanageable as a commercial product. arise.

OBJECTS OF THE INVENTION The object of the invention is therefore to provide a television film scanning device of the type mentioned at the outset, which uses semiconductor line or line sensors to produce television images of high resolution with only a slight increase in the pixel rate. An object of the present invention is to provide a film scanning device for television that can perform the following functions.

Structure of the Invention The above-mentioned object of the present invention is achieved by the structure described in the so-called characteristic part of claim 1. According to this structure, a commercially available half-shaped line or line sensor can be used. It has the advantage of being usable.

Advantageous developments and refinements of the television film scanning device according to claim 1 are described in the following claims. In particular, the advantage is that it is possible to integrate two line sensors integrally into the housing of a conventional color separator and connecting device.

The invention will now be described in detail in conjunction with the embodiments illustrated in the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS On the left side of FIG. 1, several lines of a television program are shown.

On the right side of the figure, a line sensor is schematically illustrated in its position relative to the television frame raster. In this case, the first green CG) line sensor G1 is oriented to line 1 of the frame raster, and the second edge line sensor G2 is oriented to line 2 of the frame raster, while the other , red R, and blue B are respectively arranged between the two edge line sensors. Therefore, by appropriately controlling the two edge line sensors 01 and G2, the line and intermediate line green signals can be processed simultaneously, doubling the number of lines without increasing the pixel rate of the line sensor used. becomes possible. However, in this case the red and blue video signals are only recorded with a single number of lines. The two fields corresponding to one frame image must then be generated electronically, for example by vertical filtering.

However, it is also possible to place one red and one blue line sensor separately in the frame at the same spacing as the two edge line sensors.
It may also be conceivable to arrange them at the same position relative to the raster.

In FIG. 2, a special two-line sensor with pixel offset is shown. That is, one line 1 of pixel elements is exactly offset horizontally by a half-width displacement 4) of the pixel element with respect to the second line 2, as shown.

This makes it possible to reduce the number of pixels by approximately a factor of 2, thereby making it possible to reduce the data transmission rate. From the outputs 3 and 4 of the associated shift registers 5 and 6, a corresponding green signal G is generated by applying the required pulse signal (see FIG. 3b) via the terminal 7.
1 and ()2 can be extracted. Similarly, such a pixel-displaced (ie with pixel offset) line sensor arrangement can obviously also be considered for the red and blue sensors.

FIG. 3 shows a timing diagram of several signals occurring in the circuit shown in the block diagram of FIG. The pulse signal shown in FIG. 3(a) is used to time the line sensor to be activated during time t0.

This time is the integration time during which the entire optical signal can be recorded. FIG. 5(1)) shows a pulse signal for transmitting the charge generated in the light sensing element of the line sensor during reception to each shift register of the line sensor. The respective video signals that are generated during reception and can be picked up by the line sensor are shown in FIG. 3(C). The line period t1 of the video signal at the output end of the line sensor is approximately twice the line period t2 determined corresponding to each television standard, as shown in the output video signal shown in FIG. 3(d). It is.

In this case, the line period t2 of the video signal shown in the third (d) approximately corresponds to the Barne duration or pulse width t0.

FIG. 4 shows the essential parts of a television film scanning device (scanner) according to the invention. The image of the running image film 11 is projected onto a beam splitting prism system 12 via the entire imaging objective system 10 . The beam splitting prism system 12 is provided with a red line sensor 13, a green "1" line sensor 14, a green "2" line sensor 14', and a curvature line sensor 15. A plane-parallel plate can be arranged between the line sensors 14 and 15 and the color-dividing prism system 12 in order to calibrate the imaging. Among the plane-parallel plates, the red sensor 1 is shown in the figure.
Only one plane-parallel plates 16 and 17 for calibration are shown between the sensor 3 and the evening sensor 5, respectively. According to this calibration plate υ,
Full image adjustment or calibration in both horizontal and vertical directions is possible.

Line sensors 3 to 15 are provided with timing signals such as
From the clock generator 18 @ Figure 3 (a) and Figure 3 (b)
) K is supplied.

Amplifiers 19 to 22 and low-pass filters 23 to 26 are connected to the outputs of the line sensors 3 to 15. The video signals shown in FIG. 3(c) can be taken out from the output ends of these low-pass filters or low-pass filters 23 to 26, and these video signals are
Next, an analog/digital converter (A/D converter)
27 to 30.

The A/D converter is supplied at the sampling frequency by a clock generator 18. The digital video signals that can be taken out from the output terminals of the A/D converters 2T to 30 are converted by the following standard converter 31 into video signals conforming to the television standard. However, if only one line sensor 13 and 15 is used, respectively, the red and blue video signals must be pre-converted by vertical filters 32 and 33 into a video signal with an intermediate line. Corresponding transit time compensation of the green video signal is achieved by transit time elements 34 and 35. 2 wire sensor for red, green and blue? If used, the device 32
35 can be omitted. The video signal sequentially applied in the standard converter 31 is converted into a video signal having an intermediate line. Furthermore, the video signal shown in FIG. 6(C) is time-compressed at the timing of frequency f2=kXf.

The digital video signals R, C), B which can be taken out from the output of the standard converter 31 are then analogized in D/A converters 36 to 38, so that the output 39
, 40.41, the red output signal R shown in FIG. 3(d)
a1 A green output signal Ga and a blue output signal Bamir can be output.

Effects of the Invention According to the present invention, the pixel rate can be increased only slightly by using a conventional semiconductor line sensor, without the need to use a semiconductor line sensor driven at a high bit rate, which is not currently available commercially. The effect is thus achieved that it is possible to realize a device of the type mentioned at the outset, which is capable of generating television pictures with high resolution.

[Brief explanation of the drawing]

1 is a schematic diagram showing the position of the line sensor with respect to the television raster in a simplified form; FIG. 2 is a diagram showing the special structure of the two-line sensor; and FIG. 3 shows a film scanning device for television according to the invention. FIG. 4 is a time diagram showing some of the signals generated, and FIG. 4 is a block diagram showing the essential parts of a television film scanning apparatus according to the invention. 3.4...Output end, 5.6...Shift register,
T...Terminal, 10...Imaging objective lens system, 11...
・Image film, 12...Beam splitting prism system, 13
~15...Semiconductor wire sensor, 16.17...Plane parallel plate for calibration, 18...Clock generator, 19-22...
・Amplifier, 23~26...Low pass filter, 27~
30...Analog/digital (A/D) converter, 3
1... Standard converter, 32.33... Vertical filter,
34.35...Transmission time element, 36-38...Digital/analog (D/A) converter, 39-41...
・Output terminal, R, G, B...Digital video signal.

Claims (1)

[Claims] 1. For use in television for sequentially scanning a continuously moving film line by line, provided with semiconductor line sensors for red, blue and green to generate color television signals. In a film scanning device, two line sensors (14, 14') are installed in the beam path for the green component of the image with a geometrical displacement or offset relative to the two positionally adjacent television lines of the frame.
) is oriented. 2. Two "green" wires or line sensors (14, 14'
) is further relatively displaced or shifted in the horizontal direction by one half of the pixel width. 3. In the beam path of the red and/or blue component of the image, two line sensors are likewise oriented with a geometrical displacement or offset by two television lines adjacent in position in the frame. A television film scanning device according to item 1. 4. Television film scanning according to claim 3, in which the line sensors associated with one color component are each additionally displaced relative to one another in the horizontal direction by half the pixel width. Device. 5. Geometrically, two line sensors (13, 15) arranged in the beam path for the red and blue components of the image are
2. Television film scanning device according to claim 1, arranged between two "green" line sensors (14, 14'). 6. The beam splitting prism (12) between the film (11) and the semiconductor line sensor (13 to 15) arranged on the exit side of the prism (12), which is provided with a corresponding color filter. A calibration (adjustment) plate (1) is provided between the color filter and the line sensor.
6, 17) A television film scanning device according to claim 1, further comprising: 6, 17). 7. The television film scanning device according to claim 6, wherein each calibration plate (16, 17) is adjustable in both the horizontal and vertical directions. 8. A television film scanning device according to claim 1 or 3, wherein the two color component line sensors are each integrated on a semiconductor substrate. 9. A television film scanning device according to claim 1 or 3, wherein two line sensors of one color component are housed in a common housing. 10. Claims in which the geometrical displacement or offset of two positionally adjacent television lines is realized by optically imaging them onto two positionally separate line sensors. 3. The television film scanning device according to claim 1 or 3. 11. Vertically filtering (32, 33) the video signals derived by the red and blue line sensors (13, 15) in order to generate a television field image. Television film scanning device. 12. Chrominance output signals (R_a, G_a, B_a) with high resolution corresponding to television standards,
Claim 1 generated by compressing video signals corresponding to two television fields derived from a line sensor, for example by a factor (k) approximately equal to "2" and outputting them sequentially in time. 12. A television film scanning device according to any one of items 1 to 11.