JPS5994973A - Device for recording image indicated on video on photographic film - 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 The present invention relates to an apparatus for recording an image displayed on a video monitor onto photographic film, and more particularly to a device for recording an image displayed on a video monitor on photographic film, and in particular a video signal input connected to said input for recording the received video signal. a video monitor for converting into an image and displaying said image on a screen; means for supporting a photographic film to be exposed by the image displayed by said video monitor; and between the screen of said video monitor and said photographic film; It concerns a mushroom with an optical system arranged and operated.

Such devices are also known as “video imagers”.
connected to electronic medical examination or diagnostic equipment (m-sound scanners, computerized tomography equipment, etc.), for example, where the results of the examination are presented as an image on a video monitor. The video signal provided by the inspection device is fed to the input of a recording device and is converted into images by a monitor inside this recording device, and these images are recorded on photographic film or photographs. can be recorded on the plate.

In currently known video recording devices, an optical system is used, which is often equipped with a wide-angle lens. This type of lens has a reduction in light at the edges of the image (vignetting).
It has the inconvenience of no).

In fact, in such lenses there is a reduction in light from the center of the lens to the outer edges, and this reduction in light can be up to 20%. The illuminance or transmission characteristic of a lens is actually the following relation: % where Eγ is the illuminance in a direction making an angle γ to the axis of the lens, and EO is the illumination on the axis, i.e. Represents the illuminance at the center of the lens.

The cos' rI4 number can be approximated by a parabolic function for simplicity.

In order to overcome the above-mentioned inconveniences, it is known to use special adaptive optics filters that substantially compensate for the illumination characteristics of the lens. It is therefore possible to completely reduce the oral erosion effect.

However, this solution introduces additional inconveniences. It reduces the overall brightness of the image and also requires a high precision compensation filter, which is expensive to manufacture.

The object of the invention is to provide a device of the type mentioned above, by means of which the inconvenience of vignetting in recording images can be greatly reduced without the need for special expensive high-precision filters. to remove it in an easy and economical way.

To achieve this objective, the device according to the invention comprises:
It has the following main features: It adjusts the brightness of the image displayed on the screen of said video monitor by including a compensation circuit connected to the video monitor.
The illumination characteristics of the optical system are varied in a compensatory manner so that the image recorded on the photographic film is less susceptible to vignetting effects.

Further features and advantages of the device according to the invention will become apparent from the following description with reference to the accompanying drawings. These drawings are strictly non-limiting examples and include Figures 1 and 2.
The figures show first and second embodiments of the device according to the invention.
2 shows a partially block circuit diagram; FIG. Referring to FIG. 1, a first embodiment of the apparatus according to the invention comprises a housing 1 in which a video monitor and a lens 3, generally indicated by 2, are disposed. ing. A photographic film or plate 4 is provided on the screen of the monitor 2 and exposes it through a lens 3, thereby recording this image.
is shown by.

The video monitor 2 includes a conventional input stage 5 including a preamplifier circuit, an impedance matching circuit, and the like. The input 5a of the input stage 5 represents the input to the device and is supplied with a video signal from a testing device, such as an electronic medical diagnostic device with a video monitor displaying the results of the test.

The output of the input stage 5 is connected to the cathode of a cathode ray tube 7 through a video amplifier 6.

This human power stage 5 is further connected to a synchronization signal separation stage 8 . This stage provides a horizontal synchronization signal to the first oscillator 9 (horizontal oscillator) and also provides a vertical synchronization signal to the second oscillator 1110 (vertical oscillator).

The oscillator 9 supplies a line frequency pulse signal to a power stage 11 for horizontal deflection, which powers the cathode ray tube 7.
horizontal deflection coil 7a.

The vertical oscillator 10 provides a pulse signal at the frame frequency to a power stage 12 for vertical deflection, and this power stage 12 drives the vertical deflection coil 7b of the cathode ray tube 7.

A compensation circuit according to the invention is generally designated by 13. In the embodiment shown in FIG. 1, two double integration circuits 14, 15 are provided, each connected to the output of the horizontal oscillator 9 and the vertical oscillator 10. In operation, this integrator circuit 14.15 integrates two signals coming from the oscillators to which they are respectively connected.
Perform multiple integrals.

The first integration converts the pulse signals coming from each of the oscillators into sawtooth signals with the same frequency, and the second integration converts them into signals with the same frequency and parabolic waveform. be done.

The output of this integrating circuit 14,15 is connected to the input of a summing circuit 16, which is connected by a potentiometer 18 and a capacitor 19 to a biasing circuit 17 of the control grid 7C of the cathode ray tube 7.

In operation, the output signals from the integrating circuits 14.15 are summed and then superimposed on the bias voltage of the control grid of the cathode ray tube 7. As a result, the brightness of the elements of the 10-image displayed on the screen of the cathode ray tube 7 is enhanced, and this enhancement has a parabolic shape. That is, the leverage increases from the center of the image to the outer edges of the image according to the parabolic law.

Adjusting the integration constants of the integration circuits 14 and 15 (for example using the respective potentiometers 20, 21) and also the amplitude of the signal which is superimposed on the bias voltage of the control grid of the cathode ray tube (using the potentiometer 18). By adjusting , the brightness of the image displayed on the screen of the anode ray tube can be varied in such a way as to compensate for the illumination characteristics of the lens or optical system used.

According to this method, photographic film or photographic plate 4
The vignetting recorded above is virtually negligible and does not require any special compensation filters.

Another advantage of the solution according to the invention is that, unlike conventional devices using compensation filters, the image recorded on the plate 4 is affected by any brightness loss that occurs. The point is that there is no.

A simplified embodiment of the device according to the invention is shown in FIG. In this figure, elements or parts that have already been described with reference to FIG. 1 are indicated using the previously used reference numerals.

The advantages of the embodiment shown in FIG. 2 result from the following fact. That is, the horizontal deflection power single stage 11 usually has the following characteristics:
A step-up transformer 30 is provided with a capacitor 31 connected in parallel with the secondary winding. The R current (deflection current) flowing in the primary winding of the transformer 30 is proportional to the integral of the pulse signal coming from the horizontal oscillator 9. A capacitor 31 attached to the output of transformer 30 performs a second integration of this pulse signal. The signal obtained from the secondary winding of the transformer 30 is therefore proportional to the integral of the signal coming from the horizontal oscillator and can therefore be fed directly to the summing circuit 16.

In this case, another integrating circuit 14 as shown in FIG.
is no longer needed.

For the rest, the embodiment shown in FIG. 2 (and its operation) is exactly the same as the embodiment shown in FIG.

Of course, embodiments and details of construction may vary widely from those shown and described by way of non-limiting example, while retaining the principles of the invention without departing from the scope of the invention.

[Brief explanation of drawings]

FIGS. 1 and 2 are circuit diagrams showing outlines of first and second embodiments of the present invention, respectively. In the figure, 1 is a housing, 2 is a video monitor, 3 is a lens, 4 is a photographic film or photographic plate, 5 is an input stage, 6 is a video amplifier, 7 is a cathode ray tube, 8 is a separation stage, 9
and 10 is an oscillator, 11 and 12 are single stage power, 13
14 and 15 are double integration circuits, 16 is an addition circuit, 17 is a bias circuit, and 30 is a transformer. Patent Applicant: Bi-Pφti-Kai Esse Fist P-A-1%j
- Procedural Amendment (Method) November 16, 1982 2, Title of Invention Apparatus for Recording Images Displayed on a Video Monitor on Photographic Film 3, Relationship with the Person Who Makes the Amendment Case Patent Applicant Address: Sinto Caomaggiore, Venice, Republic of Italy (no street address) Name: B.P.I. Esse P.A. Representative: Licio Plotzner 4, Agent address: Yachiyo 2-3-9 Tenjinbashi, Kita-ku, Osaka One Pill Telephone Osaka (06) 351-6239 (Representative) Name Patent Attorney (6474) Kube Fukami 5, Date of amendment order Voluntary amendment 6, Application to be amended 3. Column for the representative of the patent applicant, drawings, power of attorney and translation 7, contents of amendments (1) 3. of the application. To the representative of the patent applicant
We will replenish the product. I am attaching a new amendment application prepared for that purpose. (2) We will supplement the drawings drawn in dark ink as shown in the attached sheet.
In addition, the content is strange! ! there is no. (3) We will supplement the power of attorney and translation as shown in the attached document. Above 2-

Claims (6)

[Claims] (1) A device for recording an image displayed on a video monitor onto photographic film or a photographic plate, the device having a video signal input (5) and a video signal connected to said input (5a) to receive the video signal. a video monitor (2,5 to 12) for converting the image into an image and displaying said image on a screen, and a support for supporting a photographic film or plate (4) to be exposed by the image displayed by said video monitor. and an optical system disposed between said video monitor and said photographic film or photographic plate.
3), further comprising a compensation device connected to the video monitor and capable of varying the brightness of the image displayed on the screen of the monitor so as to compensate for the illumination characteristics of the optical system (3); Apparatus, characterized in that it comprises a circuit, by means of which the image recorded on said film or plate (4) is influenced by vignetting to be substantially negligible. (2) a lens (3) with an illuminance characteristic curve roughly of the type cos' γ, where γ is the field angle, and said compensation circuit (13) is configured to characterized by being configured to enhance the relative brightness of each pixel displayed on said video monitor by an amount that is a substantially increasing function of the distance of the pixels; An apparatus according to claim 1. (3) the compensation circuit (13) adjusts each pixel displayed on the screen of the video monitor by an amount that is a substantially parabolic function of the distance of the pixel from the center of the screen of the video monitor; 3. The device according to claim 2, characterized in that it is configured to enhance the relative brightness of. (4) The video monitor includes a cathode ray tube, and the compensation circuit includes a first periodic signal that generates a first periodic signal having a frequency equal to the horizontal synchronization frequency of the cathode ray tube and a parabolic waveform.
a second signal generating circuit (15) that generates a second periodic signal having a frequency equal to the vertical synchronization frequency of the cathode ray tube and a parabolic waveform; 1 and an input connected to the output of the second signal generating circuit <14.15>, and an output connected to the bias circuit (17) of the control grid (7C) of the cathode ray tube (7); an adder circuit (16) for superimposing the sum of the two periodic signals on the bias voltage of the grid (7G);
An apparatus according to any one of claims 1 to 3. (5) The first and second signal generation circuits each have a first
and a second double integration circuit (14, 15),
and a second double integration circuit is connected to the horizontal oscillator (
9) and the output of the vertical oscillator (10), respectively, characterized by integrating the pulse signal from the oscillator (9, 10> twice). The device described. (6) The first signal generating circuit is connected to the cathode ray tube (7).
horizontal deflection stage (11), said stage (11) comprising a step-up transformer (30), said stage (11) comprising a step-up transformer (30);
A capacitor (31) is connected between the secondary windings so that, in operation, the pulse signal provided by the horizontal oscillator (9) of the monitor (7) is connected between the secondary windings. There is a voltage substantially proportional to the integral and the second signal generating circuit comprises a 21i integrating circuit (15) connected to the output of the vertical oscillator (10) of the monitor. 5. The device according to claim 4, characterized in that the pulse signal provided in operation by the oscillator (10) is integrated twice.