JPH06292149A - Motion detector - Google Patents

Abstract

PURPOSE:To relieve the delay amt. and hardware configuration to detect a motion. CONSTITUTION:Block processing is executed in a frame memory circuit 11 in which even numbered fields and odd numbered fields are in existence in mixture, picture element data are sequentially outputted from the frame memory circuit 11 to detect a motion based on a difference between inter-field picture element data, then picture element data are read from the frame memory circuit 11 so as to output alternately the picture element data of the odd and even numbered fields, thereby obtaining a difference between inter-field picture element data by having only to delay the read picture element data by one data at a delay circuit 13 and simplifying the circuit configuration and reducing the delay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detecting device,
For example, the pixel data is sequentially output from a memory circuit in which pixel data of an even field / odd field of a video signal are mixed.

[0002]

2. Description of the Related Art Conventionally, a motion detecting device has been used to detect motion. This type of device generally detects the motion of an image by storing one frame of data in a frame memory, then reading from this memory in units of a predetermined pixel block and calculating a difference between fields. Was there.

[0003]

However, in the above conventional example, the pixel data in the block is divided into blocks in the frame memory, the pixel data in the block is sequentially output in the horizontal line direction as shown in FIG. Since all the data are output, the data of the next horizontal line is sequentially output, which has the following drawbacks.

That is, in the case where the pixel data in a block is calculated as a vertical difference and motion is detected based on the sum of the absolute values of the differences, the delay amount must be increased. There is a problem that the hardware configuration of the motion detecting section becomes complicated.

In view of the above problems, it is an object of the present invention to reduce the amount of delay and the hardware configuration for detecting motion.

[0006]

According to the present invention, there is provided a motion detecting device provided with a memory controller for sequentially outputting pixel data from a memory circuit in which pixel data of even field / odd field of a video signal are mixed. The even pixel field and the odd field are alternately read out in the vertical direction, and the output pixel data is output.

[0007]

In the present invention, the pixel data in the even field and the pixel data in the odd field are alternately read out in the vertical direction and output. Therefore, by delaying the read pixel data by one data, the difference in pixel data between the fields can be obtained. Can be obtained, and the circuit configuration can be simplified and the data delay amount can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the motion detecting device of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a circuit configuration of a memory controller. In FIG. 1, 10 is an A / D converter for converting an analog video signal input from the outside into digital data, and 11 is a frame memory circuit for storing digital video data for one frame.

Further, 12 is a memory control circuit for controlling write and read addresses to the frame memory circuit 11, 13 is a delay circuit for delaying one pixel data, and 14 is an absolute value of input digital data. Is an absolute value calculation circuit, and 15 is a delay circuit for delaying one pixel data.

Next, 16 is a motion detection / determination device for detecting motion from the sum of absolute values of differences in pixel data between fields, 17 is a delay circuit for delaying 64 pixel data, 1
Reference numeral 8 is an intra-frame processing circuit that processes pixels in a block in which pixel data for two fields are mixed as the same frame. Reference numeral 19 is an intra-field processing for processing pixels in a block in which pixel data for two fields is mixed in field units. Circuit.

In the above structure, the video signal Video input from the outside is converted into digital video data by the A / D converter 10 and then written in the frame memory circuit 11. The memory control circuit 12 operates as shown in FIG.
A block of × 8 pixels is formed, and the range for motion detection is determined.

The memory control circuit 12 controls the frame memory circuit 11 to output pixel data of even and odd fields in the vertical direction in the order of numbers shown in FIG. In this way, the pixel data output from the frame memory circuit 11 is set to 1 by the delay circuit 13.
The difference between the pixel data delayed by the amount of data is detected, and the difference in pixel data between fields is obtained.

The difference in pixel data between fields is converted into an absolute value by the absolute value calculation circuit 14. Then, the absolute value is added to the sum of the absolute values of one data before in the delay circuit 15, and is input to the delay circuit 15 again. The sum of the absolute values of the differences between the fields output from the delay circuit 15 is input to the motion detection determiner 16 and is used for the motion detection determination for each block of 8 × 8 pixels.

Then, based on the result of the motion detection judgment, the delay circuit 17 delays the pixel data for 64 data required for the motion detection judgment to obtain pixel data, and the motion detection judging device 1
By switching the switch 20 by the control from 6,
When the movement between fields is large, it is input to the intra-field processing circuit, and when the movement between fields is small, it is input to the intra-frame processing circuit 18.

As described above, when pixel data of even fields and odd fields are mixed in the frame memory circuit 11 and motion detection between the fields is performed, pixel data is read from the frame memory circuit 11 in the vertical direction. By doing so, the circuit configuration after that can be reduced, and the delay amount can be reduced.

[0016]

As described above, according to the present invention, when a frame memory circuit in which even fields and odd fields coexist is divided into blocks, pixel data is sequentially output, and a motion is detected by a difference in pixel data between fields. Since the reading of the frame memory circuit is controlled so that the pixel data of the even field and the pixel data of the odd field are alternately read and output in the vertical direction,
By only delaying the read pixel data by one data, the difference in pixel data between fields can be obtained, the structure of the motion detection device can be simplified, and the delay amount can be reduced. You can Therefore, the present invention requires a miniaturization, for example, a camera integrated type V
It is also suitable for those mounted on TR.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of a motion detection device of the present invention.

FIG. 2 is a diagram showing a reading order of pixel data which is blocked into 8 × 8 pixels in a frame memory circuit.

FIG. 3 is a diagram showing that a screen of one frame is divided into blocks of 8 × 8 pixels.

FIG. 4 is a diagram showing an order of reading pixel data blocked into 8 × 8 pixels in a conventional frame memory circuit.

[Explanation of symbols]

 10 A / D Converter 11 Frame Memory Circuit 12 Memory Control Circuit 13 Delay Circuit 14 Absolute Value Calculation Circuit 15 Delay Circuit 16 Motion Detection Judge 17 Delay Circuit 18 In-frame Processing Circuit 19 In-field Processing Circuit 20 Switch

Claims (1)

[Claims] 1. A motion detection device comprising a memory controller for sequentially outputting pixel data from a memory circuit in which pixel data of even field / odd field of a video signal coexist, wherein the memory controller outputs the pixel data vertically. A motion detection device characterized in that an even field and an odd field are alternately read out and output in a direction.