JP2839061B2 - Image processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for performing predetermined image processing such as compression,
An image processing apparatus for performing an encoding process represented by a decompression process, a filtering process such as an edge process or a hue change process, and an input unit for inputting image data, and a frame or a field for the input image data. The present invention relates to an image processing apparatus including a set of image processing means for performing predetermined image processing in parallel for each image and an output means for outputting image data on which image processing has been performed by the image processing means.

[0002]

2. Description of the Related Art In general, in an image system for expressing motion, a method of transmitting a plurality of still images in a unit time is employed. The number of images in the unit time is called a frame, and a video used for a television or the like is used. The video is composed of 30 frames per second. Then, in order to smoothly express a fast-moving image, an interlaced scanning method in which a scanning line of one frame is divided into even and odd fields is adopted. Therefore,
In the interlaced scanning method, image data of one field is transmitted every 1/60 second, and in the non-interlaced scanning method, image data of one frame is transmitted every 1/30 second.

In an image processing apparatus, image data transmitted in such a method is compared with image data of a predetermined capacity within a predetermined time, that is, image data of one field at least in 1/60 second or 1/30. It is necessary to process and output one frame of image data per second, and if this time is exceeded, the delayed image data is output randomly and is lost. As a result, when such image data is reproduced as a visible image, It will be unsightly. Therefore, the conventional image processing apparatus is configured to be able to process image data of one field at least in 1/60 second, or to process image data of one frame in 1/30 second. In other words, one set of image processing means is capable of processing a frame or a frame even if the single image processing means cannot process the image data in 1/30 seconds or 1/60 seconds, which is the permissible processing time of one frame or field of single image data. For each field,
By performing predetermined image processing on a plurality of frames or fields in parallel, processed image data for a single image data is output within 1/30 seconds or 1/60 seconds. For example, two sets of image processing means are provided corresponding to the odd field and the even field,
Some of them are configured to perform processing in parallel, and within 1/60 seconds, each of the image processing units performs compression processing of image data of one field and stores the processed image in a storage unit as a processed image. Within / 60 seconds, the processed image of one field is taken out from the storage means, and each of the image processing means expands and outputs the image data of one field.

[0004]

However, in the above-described conventional image processing apparatus, a window display process for dividing a display area on an image display device such as a CRT and displaying different images in the respective areas simultaneously is performed. In such a case,
It is difficult to extract a plurality of image data stored in the storage means within the fixed time and to simultaneously expand and output the image data by the image processing means. And the image becomes very unsightly. Therefore, it is conceivable to shorten the time required for the reproduction process of one frame or one field by storing the compressed data in the storage unit after reducing the number of pixels by reducing the original image data in advance. However, in this case, when only a single image is reproduced, the resolution of the reproduced image is degraded. It is also conceivable to provide a plurality of sets of the above-described set of image processing means corresponding to each image. However, the apparatus becomes large and complicated, and lacks economic efficiency. . The above disadvantages are when multiple image data need to be processed in parallel at the same time, for example,
Encoding processing, decoding processing, or
In general, filtering processing is common.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly economical image processing method capable of simultaneously processing a plurality of image data within a predetermined processing time for one image without deteriorating the resolution and without causing an unsightly image. It is to provide a device.

[0006]

In order to achieve this object, the image processing apparatus according to the present invention is characterized in that, when a plurality of sets of image data are input to the input means, the plurality of sets of image data are converted into a plurality of sets. Providing sampling means for sampling a frame or a field to be subjected to parallel processing by the image processing means so as to be temporally uniform,
The image processing means performs predetermined image processing on the sampled frame data or field data.

[0007]

One image data is composed of a plurality of continuous frames, and a unit frame is composed of two fields, an even number and an odd number. Now, when a plurality of single image data are input, the sampling means converts the number of field data or frame data that can be processed by the image processing means into frames or fields from each image data in time. Sampling so that For example, when the image processing means is configured with two circuits corresponding to the odd and even fields, in order to simultaneously process two images,
Only one of the odd field and the even field is sampled from each image data, and one circuit of the image processing means processes one field of one image data, and the other circuit processes one field of the other image data. It processes one field. Further, when the image processing means is composed of two circuits corresponding to odd and even fields, in order to simultaneously process four images, one frame is sampled every four frames from each image data, and the sampling frame is sampled. Image processing.

[0008]

According to the present invention, within a predetermined processing time for one image, a plurality of image data can be simultaneously processed without deteriorating the resolution and without causing an unsightly image, and thus has excellent economical efficiency. An image processing device can be provided.

[0009]

Embodiments will be described below. As shown in FIG. 1, an image processing apparatus includes an input unit 2 having an interface function of inputting image data from a storage unit 1 in which compressed image data is stored, an odd field and an even field of the input image data. A pair of image processing means 4 and 5 for decompressing the compressed data and reproducing the original image data each time; an editing and synthesizing means 6 having a field memory for expanding the reproduced image data for each unit field;
An output unit 7 that D / A converts the reproduced original image data into an image signal of the NTSC system and outputs the converted signal to the monitor unit 8.

The storage means 1 is constituted by a hard disk device and, as shown in FIG. 4A, stores image data that has been subjected to a compression process in a so-called JPEG system. One image data is composed of a plurality of continuous frames, and a unit frame is composed of two fields of an even number and an odd number. As shown in FIG. Is divided into odd field data and even field data and selectively output to the image processing means 4 and 5. The image processing means 4 and 5 execute expansion processing in parallel with the so-called JPEG method in the same manner as the compression algorithm. The image processing means 4 performs expansion processing on odd-numbered field data, and the image processing means 5 The decompression process is performed on the even field data.

The image data expanded for each field is input to the editing / synthesizing means 6 without deteriorating the resolution, and is expanded into a memory for each predetermined data volume (for example, for each field or unit of expansion processing). As shown in FIG. 4C, the output means 7 performs D / A conversion and NTSC conversion.
After being converted into an image signal of the system, the image signal is outputted to the monitor means 8.

The input means 2 further includes a plurality of input processing units 2 so that a plurality of image data can be simultaneously inputted.
a, 2b and 2c are provided, and each of the input processing units 2a and 2c
A sampling means 3 is provided for sampling frames or fields to be subjected to parallel processing by the image processing means 4 and 5 with respect to the image data input from b and 2c so that the frames or fields are temporally uniform.

The sampling means 3 includes a counter circuit for managing a field number and a frame number of each image data, and a sampling circuit for sampling an image to be sampled based on data set in advance according to the number of input image data. It comprises a timing signal generation circuit for generating a sampling timing signal, a selection circuit for sampling frame data or field data specified by the sampling timing signal, and the like.

As shown in FIG. 2A, when two sets of image data of A and B are inputted, as shown in FIG. Odd fields (of1, of2, of3,
…) Is selected and within the processing time of one frame,
The image processing means 4 performs expansion processing on the odd field data of the image A, and the image processing means 5 performs expansion processing on the odd field data of the image B. The processed image data input to the editing / synthesizing unit 6 is sampled and appropriately edited in a memory by sampling pixel data so as to fit as one image data. , And D / A converted to an NTSC image signal, and then output to the monitor unit 8.

As shown in FIG. 3A, when three sets of image data of A, B, and C are input, as shown in FIG. Is sequentially sampled at a ratio of one frame to three frames, and within one frame processing time, the image processing means 4 performs decompression processing on the odd field data of the image A, 5 repeats the operation of expanding the even field data of the image A in the order of A, B, C, A, B, C, A,. Similarly, the processed image data input to the editing / synthesizing unit 6 is sampled and appropriately edited in a memory by appropriately sampling pixel data so as to be included as one image data, and output as shown in FIG. By means 7, D /
The A signal is converted to an NTSC image signal and then output to the monitor 8.

Another embodiment will be described below. Sampling from a plurality of sets of image data is not limited to the above-described embodiment, but may be arbitrary as long as frames or fields are sampled so as to be temporally uniform. As the configuration of the image processing unit, an example in which a pair of image processing units divided into odd and even fields is provided has been described, but the configuration of the image processing unit is not limited to this and is arbitrary. For example, a pair of image processing means divided into odd and even fields may be further provided so that two frames can be processed simultaneously. Although an image processing that performs decompression processing has been described as an image processing, an image processing apparatus that performs compression processing, an image processing apparatus that performs compression processing in both directions, and the like can be appropriately configured. Further, the JPEG method has been described as the compression / expansion method, but the present invention is not limited to this, and can be applied to any compression method. The image processing can be applied not only to encoding and decoding processing such as compression and decompression, but also to filtering processing such as edge processing and hue change processing.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image processing apparatus.

FIG. 2 is an explanatory diagram showing an algorithm of an image reproduction process.

FIG. 3 is an explanatory diagram showing an algorithm of an image reproduction process.

FIG. 4 is an explanatory diagram showing an algorithm of an image reproduction process.

[Explanation of symbols]

 2 input means 3 sampling means 4 image processing means 5 image processing means 7 output means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06T 1/20

Claims (1)

(57) [Claims] An input means (2) for inputting image data.
A set of image processing means (4) and (5) for performing predetermined image processing on input image data in parallel for each frame or field; and the image processing means (4) and (5)
Output means (7) for outputting image data subjected to image processing according to (1), wherein when a plurality of sets of image data are input to said input means (2), said plurality of sets of images are output. Sampling means (3) for sampling a frame or a field to be subjected to parallel processing by the image processing means (4) or (5) so as to be temporally uniform from the data is provided. An image processing apparatus configured to perform predetermined image processing on the data by the image processing means (4) and (5).