JPH0374872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to facsimile devices and devices similar thereto, and in particular to a facsimile device and a device similar to the same, and in particular to an image signal in which the number of transmitted main scanning pixels is 1/n (n is an integer) with respect to the total number of pixels in the main scanning direction. It relates to a processing device.

Prior Art Conventional image signal processing methods include extracting image signals for each pixel and determining the image signal, as shown in Figure 1A, as an example when the total number of pixels in main scanning is reduced to 1/2. There is a method in which the image signal is determined by ORing the black signal in units of two pixels, as shown in FIG. 1B.

In the conventional system, in the case of system A in Figure 1, even though there is a white signal in the black signal as shown in the figure,
If the black signal is continuous, or if the white signal is continuous even though there is a black signal in the white signal, the reproduced image will be distorted or broken. Furthermore, in the case of the method shown in FIG. 1B, there arises a problem in that even though there is a white signal in the black signal, the black signal is continuous and the reproduced image is distorted, as shown in the figure.

OBJECT OF THE INVENTION The present invention aims to improve the above problems.
It is an object of the present invention to provide an improved image signal processing device in which a processed image signal is not distorted or interrupted by a simple means.

Structure of the Invention According to the present invention, in an image signal processing device in which the number of main scanning pixels sent from the device is 1/n (n is an integer) of the total number of pixels in the main scanning direction, the unprocessed image signal is divided into n pixels. means for ORing the white image signal (if any of the n pixels is white, it is considered a white image signal);
OR (n
and an image signal control means for determining the processed image signal depending on whether the immediately preceding processed image signal is a black image signal or a white image signal. In the case of a black image signal, the processed signal is the output image signal of the means for ORing the white image signal, and when the immediately preceding processed image signal is a white image signal, the processed image signal is the output image signal of the means for ORing the black image signal. There is obtained an image signal processing device characterized in that the image signal control means performs control so as to output an image signal.

Embodiment Next, an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 shows a block diagram of the present invention, in which 1 is a lens system, 2 is a photoelectric conversion section, 3 is a (binary) quantization circuit, 4 is a black image signal OR circuit, 6,
7 is an image signal passing gate, 8 is an image signal control section, and 9 is a processed image signal output section.

In this example, for the total number of pixels in the main scanning direction,
An example will be explained in which the number of main scanning pixels sent out from the device is halved. First, the image signal converted into an electric signal by the photoelectric conversion unit 2 is (2
Value) The quantization circuit 3 converts the signal into a black and white binary image signal as shown in FIG. 3A. The binarized image signal is further input to a black image signal OR circuit 4 and a white image signal OR circuit 5, respectively. Black picture signal OR circuit 4
is controlled by the image signal control unit 8 so that the binary image signal (FIG. 3A) is ORed with the black signal in units of two pixels (if either of the two pixels is black, it is considered as a black image signal). , outputs a black OR image signal as shown in FIG. 3B. Similarly, the white image signal OR circuit 5 performs an OR operation on the white signal for each two pixels of the binary image signal (FIG. 3A).
(If either of the two pixels is white, it is assumed to be a white image signal) is controlled by the image signal control section 8, and outputs a white OR image signal as shown in FIG. 3C. Further, the black OR image signal and the white OR image signal output from the black image signal OR circuit 4 and the white image signal OR circuit 5 are respectively input to image signal passing gates 6 and 7 controlled by an image signal control section 8. be done.

Therefore, the image signal control section 8 inputs the processed image signal of the processed image signal output section 9, monitors the processed image signal, and turns on the image signal passing gate 7 when the immediately preceding processed image signal is a black image signal. White picture signal
The white OR image signal which is the output of the OR circuit 5 is output to the processed image signal output section 9 in units of two pixels. or,
Similarly, the image signal control unit 8 turns on the image signal passage gate 6 when the immediately-processed image signal is a white image signal, thereby controlling the black OR which is the output of the black image signal OR circuit 4.
The image signal is outputted in units of two pixels to the processed image signal output section 9. Furthermore, the image signal control unit 8 sequentially outputs a black image signal according to the level (black, white) of the immediately preceding processed image signal.
Control is performed to switch and output the black OR image signal, which is the output signal of the OR circuit 4, and the white OR image signal, which is the output signal of the white image signal OR circuit 5, to the processed image signal output section 9. In this way, the processed image signal shown in FIG. 3D is outputted to the processed image signal output section 9.

In the above embodiment, the case where the number of main scanning pixels sent from the device is 1/2 of the total number of pixels in the main scanning direction, but the same image signal processing as performed in this detailed explanation is used. It is clear that by applying this method, it is possible to obtain an image signal processing method having the same effect as that described in this explanation even when the number of main scanning pixels is reduced to 1/2 or more.

Effects of the Invention By the method explained above, a processed image signal as shown in FIG. 3D was obtained. Therefore, it is possible to obtain a processed image signal that is improved against distortion or dropouts.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining a conventional image signal processing method.
FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a diagram illustrating the processing process of the signal processing device of the block shown in FIG. Explanation of symbols of main parts, 4... Black signal OR circuit, 5... White signal OR circuit, 6, 7... Gate,
8...Picture signal control section.

Claims (1)

[Claims] 1 In an image signal processing device in which the number of main scanning pixels of a processed image signal sent from the device is 1/n (n is an integer) of the total number of pixels in the main scanning direction obtained by scanning an image, a white image signal OR means for outputting a white image signal when at least one of the n pixels is white for each n pixel unit of the image signal; a black image signal OR means for outputting a black image signal when at least one of and when the immediately preceding processed image signal is a black image signal, the output of the white image signal OR means is used as the processed image signal, and when the immediately preceding processed image signal is a white image signal, the output of the white image signal OR means is used as the processed image signal. An image signal processing device, characterized in that the image signal control means is controlled to select outputs of the respective outputs.