JP3294914B2 - Video camera special image effect device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special image effect device for a video camera, and is devised so as to obtain an image such as a "relief image".

[0002]

2. Description of the Related Art There is a case where an image is processed and recorded at the time of photographing with a video camera to give a special effect to the image. Conventional special image effects include binarized titles, solarization images, mosaic images, and the like.

Here, a circuit for performing a binarized title and a circuit for obtaining a solarized image will be described, and an outline for obtaining a mosaic image will be described.

FIG. 8 shows a circuit for performing a binarized title.
As shown in the figure, an image signal e corresponding to a captured image is output from the solid-state imaging device 1. The luminance signal processing circuit 2 performs luminance signal processing on the image signal e to output a luminance signal Y, and the aperture signal generation circuit 3 outputs the contour axis A by performing the secondary differentiation processing to output an aperture signal A. The color signal processing circuit 4 performs color signal processing on the image signal e and outputs a color signal C0, and the modulation circuit 5 converts the color signal C0 into a low-frequency converted color signal C.
The luminance signal Y, aperture signal A and color signal C are mixed by mixers 6 and 7 to become video signal V, which is recorded on a video tape by a video head.

[0005] The title circuit 8 comprises a binarization circuit 9 and a title memory 10. When a title image is being shot, for example, when a character written in black on white paper is being shot, the luminance signal Y at this time is binarized by the binarization circuit 9 to generate a title signal T corresponding to the title character. Then, this is stored in the title memory 10. When a title is to be included in an image, the title signal T is inserted into the video signal V by the mixer 7. Then, the title signal T
Is recorded on a video tape, and when the recorded signal is reproduced, a title is included in the reproduced image.

FIG. 9 is a circuit for obtaining a solarized image. In this circuit, an analog image signal e output from the solid-state imaging device 1 is converted by an A / D converter 20 into a digital image signal E. The luminance signal processing circuit 2a, the aperture signal generation circuit 3a, the color signal processing circuit 4a, the modulation circuit 5a, and the mixers 6a and 7a include the luminance signal processing circuit 3, the aperture signal generation circuit 3,
The color signal processing circuit 4, the modulation circuit 5, and the mixers 6, 7 perform the same functions. However, signal processing is performed digitally. The D / A converter 23 converts a digital video signal into an analog signal and outputs the analog signal.

Further, as shown in FIG. 9, bit limiting circuits 21 and 22 are provided for obtaining a solarized image. The gray levels of the digital luminance signal Y and the digital color signal C0 are 126 or 256 gray levels, but are set to 4 to 8 gray levels by the bit limiting circuits 21 and 22. By doing so, a solarized image can be obtained. The solarization image is an image in a state such as “dot drawing”.

In order to obtain a mosaic image, digital luminance signal Y and color signal C are sampled. In other words, the screen is divided into a plurality of blocks, and the entire surface of each block is processed to have the same picture as the pixel at the representative point in the block.

[0009]

As described above, various special image effects have been conventionally developed, but the present inventor has come to consider obtaining an unprecedented special image effect.

The special image effect considered by the present inventor is as follows.
It is a "relief". More specifically, with reference to FIG. 6, when the object to be imaged is black in area A1 and white in area A2 as shown in FIG. 6A, the reproduced image is shown in FIG.
As shown in the figure, the area a1 is gray, the area a2 is black (black edge), the area a3 is high-luminance white (white edge),
That is, the area a4 is made to be normal white.

FIG. 7A is a plan view and FIG.
7B is the same as that obtained when the object having the shape shown in the cross-sectional view is illuminated in the direction shown by the arrow in FIG. It is an image.

Although the special image effect such as the above-mentioned "relief image" has never existed, the present invention provides a special image effect device for a video camera capable of obtaining such "relief image". With the goal.

[0013]

According to the structure of the present invention for solving the above-mentioned problems, an image signal output from an image pickup device is processed to obtain a luminance signal and a color signal, and the luminance signal and the color signal are mixed. In a video camera that outputs a video signal,
A first-order differentiation circuit that outputs a first-order differentiation signal by performing a first-order differentiation on a luminance signal; a gray-level generation circuit that outputs a base signal having a gray-level potential; and either a base signal or a luminance signal on which the first-order differentiation signal is superimposed. And selecting means for selecting and outputting the signal.

[0014]

[Function] The primary differential signal becomes a positive pulse when the luminance sharply increases, and becomes a negative pulse when the luminance sharply decreases.
A signal indicating an image such as a "relief image" is obtained by a signal obtained by mixing the gray-level base signal and the primary differential signal. If necessary, the color signal is cut or a uniform color signal indicating one color is added.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The solid-state imaging device 1, the luminance signal processing circuit 2, the aperture signal generation circuit 3, the color signal processing circuit 4, and the modulation circuit 5 have the same functions as the conventional one shown in FIG. Further, in the present embodiment, the primary differentiating circuit 30, the gray level generating circuit 5
0, uniform color generation circuit 51, switch (selection means) 52,
53 and a mixer 54.

As shown in FIG. 2, the primary differentiating circuit 30
It comprises a horizontal primary differentiating circuit 31, a vertical primary differentiating circuit 35, and an adder 39. The horizontal primary differentiating circuit 31 includes a delay circuit 32 for delaying the luminance signal Y in the horizontal direction by an amount corresponding to one pixel, a subtractor 33, and a gain controller 34.
The vertical primary differentiating circuit 35 includes a delay circuit 36 for delaying the luminance signal Y by one horizontal scanning period, a subtracter 37, and a gain controller 35.

When the gain of the gain controller 34 is positive, the horizontal primary differentiating circuit 30, for example, shown in FIG.
The primary differential signal D as shown in FIG. That is, as shown in FIG. 3A, the luminance suddenly increases at time t1 and the time t1
When a luminance signal Y whose luminance sharply increases at 2 (Y when the L1 line is scanned in FIG. 4A) is input to the primary differentiating circuit 30, the primary differentiating circuit 30 outputs a positive pulse at time t1 and a time t1. At t2, a primary differential signal D that becomes a negative pulse is output. In FIG. 3, HD is a horizontal synchronization pulse.

When the gain of the gain controller 38 is positive, the vertical primary differentiating circuit 35, for example, shown in FIG.
The primary differential signal d as shown in (e) is output. That is, the luminance signal Y before 1H is at the level shown in FIG. 3C (Y when scanning the L2 line in FIG. 4A), and the current luminance signal Y is at the level shown in FIG. (FIG. 4)
At Y) when the L3 line is scanned in (a), the primary differential signal d is obtained by the subtraction processing.

The gray level generating circuit 50 outputs a base signal B having a voltage value of a gray level (see FIG. 3A). The primary differential signals D and d are superimposed on the base signal B by the mixer 54.

The uniform color generating circuit 51 has a uniform (one color)
The color signal C1 is output. The switches 52 and 53 operate in synchronization with each other. When the switch 52 is turned on to the contact 52a, the switch 53 is turned on to the contact 53a. When the switch 52 is turned on to 52b, the switch 53 is turned on to 53b.

In this embodiment having the above-described configuration, when the switches 52 and 53 are turned on to the contacts 52b and 53b, normal photographing is performed and the video signal V is output.

The switches 52 and 53 are connected to the contacts 52a and 5
3a, the switch 52 outputs the base signal B
And a signal in which the primary differential signals D and d are superimposed. For example, when scanning the L3 line in FIG.
The signal shown in FIG. 4A is output, and when the L1 line is scanned in FIG. 4A, the signal shown in FIG. 5B is output. Further, in the mixer 7, a uniform color signal C1 is added to a signal in which the base signal B and the first-order differential signals D and d are superimposed and output. Therefore, when the target object shown in FIG. 4A is photographed, a one-color special image with a contrast as shown in FIG. 4B is obtained.

When the gain of the gain controller 34 is positive and the gain of the gain controller 38 is negative, a special image as shown in FIG. 4C is obtained, and the gain of the gain controller 34 is negative and that of the gain controller 38 is negative. When the gain is positive, a special image as shown in FIG. 4D is obtained, and when both the gains of the gain controllers 34 and 38 are negative, a special image as shown in FIG. 4E is obtained. .

When the gains of the gain controllers 34 and 38 are gradually changed between positive and negative, FIG.
Images that gradually change from one special image shown in (c), (d), and (e) to another special image may be used.

[0026]

According to the present invention, as described in detail with the above embodiments, one of the contours can be formed in the same manner as an image like a relief image, that is, an image formed when an object is illuminated from one direction. A special image can be obtained in which the edge on the side is black and the edge on the other side is white.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a primary differentiating circuit.

FIG. 3 is a waveform chart showing signals of the embodiment.

FIG. 4 is an explanatory diagram showing a shooting target image and a special image (relief image).

FIG. 5 is a waveform chart showing a base signal on which a primary differential signal is superimposed.

FIG. 6 is an explanatory diagram showing a shooting target image and a special image (relief image).

FIG. 7 is a shape diagram showing an object shape corresponding to a shooting target image.

FIG. 8 is a circuit diagram showing a circuit for performing a binarized title.

FIG. 9 is a circuit diagram showing a circuit for obtaining a solarization image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid-state image sensor 2 Luminance signal processing circuit 3 Aperture signal generation circuit 4 Color signal processing circuit 5 Modulation circuit 6, 7 Mixer 30 Primary differentiation circuit 31 Horizontal primary differentiation circuit 35 Vertical primary differentiation circuit 50 Gray level generation circuit 51 Uniform color Generating circuit 52, 53 Switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 9/74 H04N 5/262

Claims (3)

(57) [Claims] An image signal output from an image sensor is processed to obtain a luminance signal and a chrominance signal, and the luminance signal and the chrominance signal are mixed to output a video signal. A primary differential circuit that outputs a primary differential signal, a gray level generating circuit that outputs a base signal having a gray level of potential, and one of a base signal and a luminance signal on which the primary differential signal is superimposed. A special image effect device for a video camera, comprising: selecting means for outputting. 2. A video camera that processes an image signal output from an image sensor to obtain a luminance signal and a chrominance signal, and outputs a video signal by mixing the luminance signal and the chrominance signal. A primary differential circuit that outputs a primary differential signal, a gray level generating circuit that outputs a base signal having a gray level potential, and a base signal on which the primary differential signal is superimposed or one of a luminance signal first selection means for outputting Te, a second selection of the one signal selected by the output of one and uniform color generating circuit for outputting a uniform color signal indicating a color, uniform color signals or color signals Means, and a mixer for mixing and outputting the signals selected by the first selection means and the second selection means . 3. The primary differentiating circuit according to claim 1, wherein the primary differentiating circuit is configured to perform primary differential based on a difference between a luminance signal delayed by an amount corresponding to one pixel in a horizontal direction of the screen and a through luminance signal that is not delayed. A video camera comprising: a horizontal primary differentiator for obtaining a signal; and a vertical primary differentiator for obtaining a primary differential signal based on a difference between a luminance signal delayed by one horizontal scanning period and a through luminance signal which is not so. Special image effect device.