JPS60111566A - Changing device of resolution - Google Patents

Abstract

PURPOSE:To make the area of an effective picture element coincide with the size of an image and to input the voluntary resolution picture continuously by changing the effective picture element of an image pickup element by matching with the voluntary resolution, and by changing the magnification of a zoom lens in accordance with the effective picture element. CONSTITUTION:A sampling clock is generated by a clock generator 5-1 of a resolution changing device, and the trigger for signal taking of one dimensional CCD sensor 5-3 is formed by a trigger signal device 5-2. The voluntary resolution in accordance with the input operation is selected by a resolution selection part 5-5, and a zoom lens driving part 5-6 adjusts the magnification of a zoom lens 6-7 by matching with the signal. In addition, the clock is counted by an effective specification signal generator 5-4, which is constituted by the counter, by the trigger, and the counted value is changed by the resolution which is specified by the selection part 5-5. The sum of the effective area between the output picture signal of the sensor 5-3 and the output picture signal of the generator 5-4 is counted by and AND gate 5-8, and the voluntary picture signal which is selected by the selection part 5-5 is outputted.

Description

[Detailed Description of the Invention] [Technical field to which the invention pertains] The present invention relates to an image input device and an image input device that divides a document surface into a large number of pixels using an image sensor such as a CCD, and inputs document information for each pixel. This invention relates to a resolution changing device suitable for facsimile machines and the like.

[Prior art]

Conventionally, as a method of changing the resolution of an input image9, for example, in order to set the resolution to half of that when all dots of the image sensor are used, a series of one-dimensional image sensors 1 as shown in FIG. Methods such as inputting only the odd-numbered dots of -1 or calculating the logical sum in units of two dots are used. On the other hand, if the signal after the long sword can be expanded into memory, Figure 2 (a)
white pixel 2-1. A method is also used in which the resolution is changed in a pseudo manner by processing such as converting the black pixel 2-2 into the white pixel 2'-1 and the black pixel 2''-2 in FIG. 2(b).

However, in the former case, the change can only be made to one integer fraction of the input using all the dots of the image sensor. Furthermore, in the latter case, although it is not only an integer or 1, it is still impossible to arbitrarily select the change magnification, and moreover, complicated processing is required when changing.

[Purpose of the invention]

The present invention aims to eliminate such drawbacks and provide a resolution changing device that can continuously and arbitrarily change the resolution on the document surface when inputting images without performing complicated processing. be.

[Structure of the invention]

The resolution changing device according to the present invention has an arbitrary resolution of X lines/w.
The effective pixel y of the image sensor is changed according to n (if the length of one side of the document is a mm, then y = a x ), and the magnification of the zoom lens is changed according to the effective pixel y to change the effective pixel area. By matching the size of the image with the image size, it is possible to select any resolution within the range of the number of pixels of the image sensor.

〔Example〕

Next, nine embodiments of the present invention will be described.

FIG. 3 is a diagram for explaining the present invention in detail.

The relationship between the original 6-1, the zoom lens 3-2, and the image sensor 3-3 is shown. Here, for the sake of convenience, a case will be described in which the resolution is variable in three stages.

In FIG. 6, when the resolution is the highest, the image sensor 3
The effective range of -6 is yl, and the zoom lens 5-2 is adjusted to match the image area of the original 6-1 to 2/1. At this time, since all pixels of the image sensor 6-6 are used, all extracted signals are used without being masked.

Next, when the resolution is reduced, the effective area of the image sensor 5-6 becomes y2 or c. Further, the magnification of the zoom lens is adjusted so that the image matches y2 or y3, respectively. In these cases, + u+ 1j2 or 'I
Since pixels are not needed for s Va, 1/1- of both ends of 9
Mask y2/2 or '/+ -ys/2 and cut off the signal of that part.

Figure 4 shows one A4 size document using one-dimensional COD.
The signal waveform of one line is shown when inputting at a resolution of 6 lines/wn, 12 lines/ynyn, and 8 lines/ynyn.

The number of effective pixels for each is 3456 (16 pixels/home).

2592 (12 lines/m), 172B (8 lines/m), waveform 4-1 is the sample clock, waveform 4-2 (16 lines/m)
), 4-4 (12 pieces/basket), 4-6 (S pieces/period) 4
are signals indicating the effective area of the pixel, waveform 4-6 (16
strands/g), l-5 (12 strands/M), 4-7 (8 strands/mm
) are the black and white distributions on the CCD that have been enlarged/reduced to match the effective area of the pixel by adjusting the magnification of the zoom lens.

FIG. 5 is a block diagram of the present invention, in which a clock generator 5-1 generates a sample clock, and a signal generator 5-2 generates a trigger signal for sweeping out the signal of a one-dimensional CCD sensor 5-3. . 5-5 is a resolution selection section, which is mainly used for human key selection and knob operations (2) to select an arbitrary resolution according to the number of selections; 5-6 is a zoom lens drive section; the resolution selection section 5 Zoom lens 5-7 by the signal from -5
Adjust the magnification to match the selected resolution. -Dimension C
The CD sensor 5-3 sweeps out an image signal in synchronization with the clock of the clock generator 5-1 by a trigger from the trigger signal generator 5-2. 5-4 is a signal generator for specifying the effective range of the image signal, which is composed of a counter and includes a trigger signal generator 5-4.
The clock of the clock generator 5-1 is counted based on the number of clocks from the clock generator 5-1. The count number changes depending on the resolution specified by the resolution selection section 5-5. Then, an AND gate 5-8 calculates the sum of the one-dimensional CCD sensor 5-3 output (image signal) and the output of the effective area designation signal generator 5-4 (effective area of the image signal), and the result is determined by the resolution selection unit 5-8. The image signal has an arbitrary resolution selected in .

〔Effect of the invention〕

As is clear from the above explanation, if the resolution changing device according to the present invention is used, it is possible to continuously change the resolution by simply adjusting the magnification of the zoom lens and changing the effective pixel area of the image sensor without performing complicated processing. This has the effect of allowing image input at any resolution.

[Brief explanation of drawings]

Fig. 1 shows an example of an image sensor, Fig. 2 is a diagram for explaining a conventional method of changing the resolution of an image signal developed on a memory, and Fig. 3 shows the principle of the resolution changing device according to the present invention. Figure 4 is an explanatory diagram showing the effective area of pixels and the image formed on the image sensor when inputting an A-size original at resolutions of 16 lines/B, 12 lines/my, and 8 lines/rrun. FIG. 5 is a configuration diagram of an embodiment of the resolution changing device according to the present invention. 1-1... -dimensional image sensor, 1-2... input section. 2-1.2'-1...White pixel, 2-2.2"-2.
・Black pixel. 3-1... Original i, 3-2... Zoom lens, 3-6
...Image sensor, 5-1...Clock generator, 5-2. Signal generator, 5-6...-dimensional CCD sensor. 5-4... Effective area designation signal generation section, 5-5... Resolution m-folding section, 5. -6...Zoom lens-drive unit, 5-
7...Zoom lens. Figure 3

Claims (1)

[Claims] 1. A zoom lens is used as a lens for forming an image of a document on an image sensor, and a resolution selection means, means for changing the effective pixel range of the image sensor according to an output of the resolution selection means, and the A resolution changing device comprising means for adjusting the zoom lens so that the size of the image formed on the image sensor matches the effective pixel range.