JPS6222303B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to synthesis of encoded image signals when compressing and encoding image signals such as facsimile signals using a run-length encoding method and transmitting the encoded image signals. The present invention relates to a synthesizing device that synthesizes and encodes fixed information that has been read and variable information that has been stored in advance in another input device such as a magnetic tape.

Generally, when combining encoded image signals, the combination cannot be performed with the codes as they are, but must be performed after they have been decoded. In other words, it is necessary to take steps such as decoding, combining and re-encoding, and the device has the disadvantage of being expensive. On the other hand, depending on the composite image, it may be sufficient to simply replace the image signal in units of fixed pixels, for example, in units of scanning lines.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide an inexpensive synthesizing device that replaces codes on a scanning line basis by detecting a synchronization signal.

According to the present invention, in a synthesizing device that synthesizes an image signal B with a part of an image signal A encoded by adding a synchronization signal in units of a fixed number of pixels, A means for detecting a synchronizing signal, a means for detecting a position to be synthesized by counting the synchronizing signals, and a means for inserting the code of the image signal B in place of the code of the image signal A, An image signal synthesis device is provided which is characterized in that it synthesizes encoded image signals.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an example of the relationship between an original image and a composite image used to carry out the present invention, where A represents the original image and B represents the composite image. In the figure, the shaded area A ₁ is B ₁ ,
The shaded area A ₂ is replaced by B ₂ .

FIG. 2 is a diagram showing an example of a circuit configuration used to implement the present invention. In the same figure,
The code sequence 2 of the original image is input in the order of scanning lines.
Furthermore, the code sequence 3 of the image for synthesis is input at the timing at which it should be replaced with the code sequence of the original image.
To explain using the example shown in Figure 1, the original image
During the period in which the code sequence of A ₁ is supplied, the code sequence of image for composition B ₁ is supplied, and at the time when the code sequence of original image A ₂ is supplied, the code series of image for composition B ₂ is supplied.

Furthermore, in the configuration shown in FIG. 2, line number 1 of the image for synthesis is input in synchronization with code sequence 2 of the original image. To explain an example of the line number of the image for synthesis with reference to FIG. 1, first, the code sequence of the first scanning line of _A1 is The first line number of _A1 is input until the input is completed. Subsequently, during the period in which the code sequence of _A1 is input, the line number of _A1 is input for each scanning line in synchronization with the code sequence 2 of the original image and the code sequence 3 of the composite image. The line number of the first scanning line of _A2 is input from the time when the input of the code sequence of _A1 is completed until the input of the code sequence of the first scanning line of _A2 is completed. During the period when A ₂ is input, the line number of A ₂ is input in the same way as during the period when A ₁ is input. When the input of the code series _A2 is completed, the line number of the scanning line that has already been input or the line number that does not exist in the original image is input to terminal 1. The code sequence 2 of the original image is synchronously detected by a synchronous detector 5, counted by a counter 4, and the line number is inputted to a comparator 6. The comparator 6 compares this line number with the line number 1 indicating the image for synthesis, and if they match, the code sequence 3 of the image for synthesis is sent from the gate 7, and if they do not match, the code sequence 2 of the original image is sent. By outputting, the code sequence 8 of the composite image is output.

As described above, for images that can be synthesized by replacing each scanning line as shown in Figure 1, the synthesis process can be performed simply by detecting the synchronization signal and comparing the line numbers. It has become a synthesis device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between the original image and the image for synthesis used to implement the present invention, and FIG.
The figure is a diagram showing an example of a circuit configuration used to implement the present invention. 1 is the line number indicating the image for synthesis, 2 is the code sequence of the original image, 3 is the code sequence of the image for synthesis, 4
is a counter, 5 is a synchronization detector, 6 is a comparator, 7 is a gate, and 8 is a code sequence of a composite image.

Claims (1)

[Claims] 1. Combining a part of the image signal A which has been compressed and encoded by adding a synchronization signal in units of a certain number of pixels and an image signal B which has been compressed and encoded in the same number of pixels as the image signal A. In the synthesizer that performs
means for detecting a synchronization signal in the encoded code of the image signal A; means for detecting a position to be synthesized based on the synchronization signal; 1. An image signal synthesis apparatus characterized in that coded image signals are synthesized by means of inserting a code of signal B.