JPS58114567A - Picture scale-down system - Google Patents

Abstract

PURPOSE:To correct error due to scale-down and to prevent the variance of picture, by accumulating residual and deficient values produced from an integral processing of odd value of scale-down data and discriminating the accumulated values to perform the odd value processing. CONSTITUTION:A picture 1 is read in one row unit at a picture reading section 2. A calculating section 3 computes run length of white and black dots with the read picture data. A scale-down section 6 reduces the run length with a scale- down factor alpha. Further, an encoding section 4 converts the reduction data into codes and transmits them to the reception side via a data transmission section 5. The section 6 is provided with a computing means forming the scale-down data based on the scale-down rate alpha, an accumulating section accumulating the residual and deficient values produced from the integral processing of the odd value of the scale-down data, and an odd value processing means which converts the odd value into an integer with either one of rounding, counting fractions as one emission of fractions based on the values in the accumulating section and the scale-down rate alpha.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an image reduction method in which an image to be transmitted in a facsimile apparatus is reduced in a predetermined manner.

(2) Prior art and problems In devices that transmit and receive image data, such as facsimiles, the run length of the transmitted data is calculated as a continuous length of black and white, and based on that, an efficient It is converted into a compressed code and sent and received. FIG. 1 is a block diagram of a conventional image transmission system. Image 1 is read line by line by image reading section 2, and the image data is sent to calculation section 3.

The calculation unit 3 calculates the run lengths of white dots and black dots based on the image data, and sends the calculated data to the encoding unit 4. The encoding unit 4 is configured to encode the calculated data into a compressed code and transmit it to the receiving side via the data transmitting unit 5. In this type of image transmission, when image data is sent from a highly accurate transmitter to a less accurate receiver, conventionally the image data is mechanically thinned out on the receiving side, or the image data is still stored on the transmitting side. There was a method to calculate the run length after mechanically thinning out the run length.

In these methods, 1. is thinned out regardless of the black and white pattern of the one-sided image. The reduced image @ had the drawback of being extremely difficult to see. The calculated data does not necessarily become an integer simply by multiplying the run length and the reduction rate α. Therefore, it is generally necessary to round off the numbers to the nearest whole number. but,
In such a rounding process, fractions may accumulate depending on the conditions, and the number of dots in the - line may vary greatly. In particular, when black and white are alternately consecutive, there is a reduction rate α (l), which means that all dots must be rounded up and cannot be reduced, or all dots are rounded down and deleted. Ta.

(3) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned problems by processing fractions in consideration of fractions, the cumulative value generated by converting the fraction into an integer, and the reduction rate. The main features of the present invention are a calculation means for creating reduced data based on calculated data and a reduction ratio, and a calculation means for creating reduced data by converting the fraction of the reduced data into an integer in such a one-plane image transmission method. Depending on the conditions of the accumulation part that accumulates missing values, the value of the nuclear accumulation part, and the reduction rate, rounding up, rounding up, etc.
By providing a reduction unit that has a rounding unit that performs the conversion into an integer by either rounding down, it is possible to prevent the reduction data converted into a convergence number from being sent to the encoding unit. image - achieved by the short sword method.

(b) Examples of the invention The present invention will be explained in detail below with reference to FIG.

2(a) is a block diagram and FIG. 2(b) is a circuit diagram showing an embodiment of the image frame reduction method according to the present invention. A sardine/J% section 6 is provided, and the run length C- given by the calculation section 3 is sent to the L/Is set β6, and the reduction section 6 reduces the syn length by the sardine 6 fraction α and codes it. This is the same as the conventional method except for 1. This reduction section 6 has a circuit as shown in (b). The run length L and the reduction rate α are input, and the reduction data L calculated by the small circuit A and the reduction circuit A.
S, 'ff: Water number processing circuit B which processes the input reduced data LSI and outputs the corrected reduced data LS, and the fish produced by processing the fractions as white dots and black dots. Each minute WiJ t, te! It is composed of cumulative parts CW and CB for A and a counter circuit for counting the respective cumulative parts CW and CB. Therefore, the counter circuit D receives the reset signal R at the beginning of one row.
Each time f'i is reset and the run length L is sent out, a count is made and the relevant signals are output alternately in accordance with the order of a plurality of white and black dot rows. Therefore, if the compressed data LSs processed by the processing circuit B is a mill dot, the cumulative part CW
In the case of black dots, the dots are accumulated in the accumulation section CB. The fraction processing circuit B rounds off the fraction of the reduced data LS according to the conditions shown in the following (1) to (2) based on the values of the respective cumulative parts cw and CB and the reduction rate α, rounding down, discarding p, and rounding up. , the reduced data LS without a fraction is output.

CW or CB <α ・・・・・・・・・・・・・・・
・・・ (1 set) CW or CB ≦α ・・・・・・
・・・・・・・・・ (2 types) CW or CB ≧“
・・・・・・・・・・・・・・・ (3 types) (1 type)
The reduced data LS is processed by rounding off the fraction in the case of (2), rounding down the fraction in the case of (3), and rounding up the fraction in the case of (3).

When processing fractions in this way, even if either the fraction is rounded down or rounded up, the values of the cumulative parts CW, CB increase, so it is corrected, and the black and white as described above becomes 1. Even if the dots are alternately consecutive, it is possible to prevent all dots from being deleted or from being reduced too often.

(6) As described in detail of the invention, the present invention is provided with a reduction section 6, and the fraction of the 4 rice small data LS is rounded down or rounded up depending on the values of the cumulative sections CW and CB and the reduction rate. This has the advantage that variations in the reduced images can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional image transmission system, and FIG. 2 is a block diagram (a) and (b) of a painter's small system according to the present invention.
- shows a circuit diagram of an embodiment. In the figure, 1 is a painter, 2 is an image reading section, 3 is a calculation section, 411- is an encoding section, 5 is a data transmitting section, and 6 is a small group of sardines. -7- Dyed reduction F

Claims (1)

[Claims] An image reading section that reads an image, a run length calculation section that calculates the continuous length of black and white dot formation based on the data read by each line of the image reading section, and a run length calculation section that converts the calculated data of the run length calculation section into a code. In a transmission system comprising an encoding unit for outputting and a data transmitting unit for transmitting the code, a calculation means for creating reduced data based on the calculated data and a reduction rate, and a fraction of the reduced data is converted into an integer. an accumulation part that accumulates the addition/deficiency of 1 rin caused by the addition, and a rounding process that converts the fraction into an integer by rounding, rounding up, or rounding down depending on the value of the accumulation part and the reduction rate. An image reduction method characterized in that the reduced data converted into integers is sent to the encoding unit by providing a reduction unit with a suitable means.