JPH04311278A - One-dimensional picture processor - Google Patents

Abstract

PURPOSE:To obtain a one-dimensional picture processor the picture processing speed of which does not decline even when data exist on the outside of its visual field. CONSTITUTION:This one-dimensional picture processor is provided with a binarizing means 1 which converts analog picture data form a primary image pickup element into binarized picture data based on an adequate threshold, encoding means 2 which encodes the binarized picture data, picture data storage means 3 which temporarily stores the encoded picture data from the means 2, and picture processing means 4 which performs various kinds of picture processing based on the picture data stored in the means 3. A visual field selecting means 10 selects and outputs only the data required for picture processing among the binarized picture data outputted from the binarizing means 1 to the encoding means 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-dimensional image processing apparatus that inputs analog image data from a one-dimensional image sensor and performs various image processing.

0002

2. Description of the Related Art A conventional one-dimensional image processing apparatus that inputs analog image data from a one-dimensional imaging device such as a one-dimensional CCD camera and performs various image processing will be described with reference to FIG. The binarization circuit 1 binarizes analog image data from a one-dimensional imaging device (not shown) such as a one-dimensional CCD camera using an appropriate threshold value, and outputs binary image data. The encoding circuit 2 encodes the binary image data binarized by the binary encoding circuit 1 to compress it, and outputs the encoded image data. The data buffer 3 temporarily stores the image data encoded by the encoding circuit 2 for one scan of the one-dimensional image element. An image processing circuit 4 consisting of a processor, memory, etc. performs necessary image processing based on the image data stored in the data buffer 3.

[0003] Through the above-described procedure, the conventional one-dimensional image processing apparatus can realize image processing for each scan of analog image data from a one-dimensional image sensor. Incidentally, in an actual image processing system, only data within a certain visual field out of all pixels in each scan is often required. This will be explained using FIG. 4.

Consider the process of measuring the width D within the visual field W in an original image as shown in FIG. 4(a). When the one-dimensional image sensor scans the solid line in FIG. 4(a), the binary image data from the binarization circuit 1 becomes as shown in FIG. 4(b). Here, the lowercase alphabets (a to j) shown in FIG. 4(b) correspond to 0->1 and 1- of binary image data.
This is the pixel number of the change point >0. Further, the total number of pixels of the one-dimensional image element was set to N. Next, this binary image data is encoded by encoding circuit 2 (here, 2
The data stored in the data buffer 3 is assumed to be a method of encoding binary image data into data with changing point pixel numbers of 0->1 and 1->0, which is commonly used in value image processing. is as shown in FIG. 4(c). Then, the image processing circuit 4 sequentially determines whether the data in the data buffer is within the visual field (in this example, it is determined whether it is between the A pixel and the B pixel), and as a result, the starting point f pixel is determined. and the end point e pixel is extracted. Finally, the desired width D is calculated as (fe), and the image processing ends.

[0005]

[Problem to be Solved by the Invention] However, even in such cases, conventional one-dimensional image processing devices encode binary image data for all pixels of the one-dimensional image sensor, that is, the entire field of view, and store it in a data buffer. Therefore, the software for the image processing circuit needs to extract data within the visual field. Therefore, according to the conventional one-dimensional image processing, there is a problem that the more data there is outside the viewing area, the longer it takes to extract the data inside the viewing area, and the overall speed of image processing decreases. An object of the present invention is to provide a one-dimensional image processing device in which the image processing speed does not decrease even if data exists outside the visual field.

[0006]

[Means for Solving the Problems] The above object is to provide a binary image data converting means for converting analog image data from a one-dimensional image sensor into binary image data using an appropriate threshold;
An encoding means for encoding value image data, an image data storage means for temporarily storing the image data encoded by the encoding means, and an image data storage means based on the image data stored in the image data storage means. In the one-dimensional image processing apparatus, the one-dimensional image processing device is equipped with an image processing means for performing various image processing, and the encoding means selectively selects only the data necessary for the image processing from among the binary image data output from the binarization means. This is achieved by a one-dimensional image processing device characterized by comprising a field of view selection means for outputting the image to the image.

[0007]

[Operation] According to the present invention, by newly adding the visual field selection means to the conventional one-dimensional image processing device, unnecessary data outside the visual field area is not encoded, and the data stored in the data buffer is Only data within the field of view is displayed. Therefore, there is no need for the software of the image processing circuit to extract data within the viewing area, the image processing speed is increased, and it is not affected by the presence or absence of data outside the viewing area. In addition, the viewing area can be set or changed only once before image processing.
It becomes very easy.

[0008]

[Embodiment] A one-dimensional image processing apparatus according to an embodiment of the present invention will be explained with reference to FIG. In the figure, the same components as those of the conventional one-dimensional image processing apparatus shown in FIG. In the primary original image processing device according to this embodiment, an AND gate 11 and a visual field memory 12 are provided between the binarization circuit 1 and the encoding circuit 2.
A visual field selection circuit 10 consisting of the following is added. The visual field memory 12 has a width of 1 bit and a depth corresponding to the number of pixels of the one-dimensional image sensor, and can have visual field data written therein from the image processing circuit 4 in advance. Then, when image processing is started, visual field data corresponding to the pixel number of the binary image data is output from the visual field memory 12, and AN
The D gate 11 selects only pixels whose visual field data is '1' and outputs them to the encoding circuit 3. This prevents data outside the viewing area from being encoded and stored in the data buffer.

This will be explained using FIG. 2. The purpose of image processing is the same as in the case of Fig. 4, and only the main points will be explained here. First, the image processing circuit sets visual field data in the visual field memory. Here, the data from the A pixel to the B pixel is set to '1', and the other data is set to '0' (FIG. 2(c)). Next, when image processing is started and the one-dimensional image element scans the line shown by the solid line in FIG. 2(a), the line shown in FIG.
Value image data is obtained, but at the same time, the visual field data shown in FIG. 2(c) is output from the visual field memory, and the AN
The binary image data after passing through the D gate becomes only data within the visual field, as shown in FIG. 2(d). Therefore, the data encoded by the encoding circuit and stored in the data buffer becomes as shown in FIG. 2(e), and the image processing circuit can immediately determine the width D=(fe).

0010

[Effects of the Invention] As described above, when the one-dimensional image processing device according to the present invention is used, there is no need for the software of the image processing circuit to extract data within the visual field, and it is not affected by the presence or absence of data outside the visual field. Therefore, the image processing speed is increased, and a high-performance image processing system with high operating performance and high operating performance in which the viewing area can be easily set or changed can be constructed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a one-dimensional image processing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a conventional one-dimensional image processing device.

FIG. 4 is an explanatory diagram of the operation of the conventional example shown in FIG. 3;

[Explanation of symbols]

1...2 Value conversion circuit 2...Encoding circuit 3...Data buffer 4...Image processing circuit 10...Visual field selection circuit 11...AND gate 12...Visual field memory

Claims (2)

[Claims] Claim 1: Binarization means (1) for converting analog image data from a one-dimensional image sensor into binary image data using an appropriate threshold; and encoding means for encoding the binary image data. (2) and the encoding means (2
); and image processing means (4) that performs various image processing based on the image data stored in the image data storage means (3). ) In the one-dimensional image processing device equipped with
A one-dimensional image processing apparatus characterized by comprising a field of view selection means (10) for selectively outputting only data necessary for image processing out of value image data to the encoding means (2). 2. The visual field selection means (10) includes a visual field memory (12) for specifying a visual field area, and a visual field memory (12) that selects data within the specified visual field area from among the binary image data. 2. The one-dimensional image processing apparatus according to claim 1, further comprising a gate means (11) for transmitting only the information to the encoding means (2).