JPH02199976A - Picture processor - Google Patents

Abstract

PURPOSE:To improve the processing accuracy and to obtain high picture quality by storing an interlace signal in a memory when an input picture signal is an interlaced signal, reading the signal in the form of noninterlace signal from the memory and applying the processing. CONSTITUTION:A buffer memory 7 converts a signal inputted in an interlace form into a noninterlace signal. Moreover, a coder 8 applies code processing such as orthogonal conversion coding or predictive coding with respect to the signal converted into noninterlace and after the processing required for the recording by a recording processing circuit 9, the processed signal is recorded on an optical disk or a DAT or the like. Then a buffer memory 12 converts the decoded noninterlace picture signal into the interlace signal. Since coding is applied to the noninterlace signal, high picture quality is obtained by the inter-field processing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing apparatus for capturing and recording still images from a camera, scanner, or the like.

Conventional technology Generally, when capturing a still image from a camera, scanner, etc. and recording it on a recording medium such as an optical disk or DAT, the amount of information in the image signal is extremely large, so it is necessary to reduce the amount of information to an extent that does not cause significant deterioration in image quality. Compression encode and record. Here, since signals from cameras and the like are input in an interlaced form as shown in FIG. 3, processing is normally performed within the field.

FIG. 4 shows a conventional image processing device. In Figure 4,
An input signal from a camera 1 is converted into a digital signal by an A/D converter 2. Further, the encoder 3 performs compression encoding processing on the input signal converted into a digital signal,
After the recording processing circuit 4 performs the necessary processing for recording,
Record on optical disc, DAT, etc. Here, if the input signal from camera 1 is an interlace signal, 2
For dimensional processing, processing will occur within fields.

Problems to be Solved by the Invention However, in the above image processing device,
It has the following issues.

When processing interlaced signals, the first
The accuracy of image quality processing is poor when intra-field processing is performed on a field-by-field basis in the order of field and second field. In other words, when performing two-dimensional processing, the distance between scanning lines is 1/2 between fields compared to within a field, so
Pixel correlation is higher between fields, improving encoding accuracy.

For example, Figure 5 shows an example of two-dimensional prediction in predictive encoding, which is one of the encoding processes. Compared to intra-field prediction, inter-field prediction has a shorter distance between pixels, so the prediction Accuracy increases.

Similarly, in orthogonal transform encoding such as DCT, higher image quality can be obtained by inter-field processing.

In view of the problems of the prior art, it is an object of the present invention to perform internal processing between fields on signals input in the form of interlace, thereby realizing more accurate processing.

Means for Solving the Problems The present invention provides that, if the input image signal is an interlaced signal, the interlaced signal is stored in a memory and read out from the memory in the form of a non-interlaced signal for processing. This is a characteristic image processing device.

According to the above-described configuration, the present invention stores the input interlace signal for one frame in the memory and reads it from the memory in a non-interlaced manner, thereby making it possible to perform subsequent processing between fields. can.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of an image processing apparatus according to the present invention. In FIG. 1, 5 is a camera, 6 is an A/D converter that converts the input signal from the camera into a digital signal, and 7 is a buffer memory that converts the input signal in the form of interlace to a non-interlace signal. do. Further, 8 is an encoder which performs encoding processing such as predictive encoding or orthogonal transform encoding on the signal converted to non-interlace, and a recording processing circuit 9 which performs processing necessary for recording. After that, it is recorded on an optical disk, DAT, etc.

Here, if the input signal is a digital signal, the A/D
Since no converter is required, the input signal is written directly to the memory. In addition, in the buffer memory 7, the interlaced signal is stored for one frame in the order of the first field and the second field, and when read out, the lines of the first field and the lines of the second field are read out alternately in order, thereby creating a non-interlaced signal. I get a signal.

Next, FIG. 2 shows a method for reproducing data recorded by the above method. In FIG. 2, 10 is a reproduction circuit that performs reproduction processing, 11 is a decoder that restores encoded data to the original image signal, and 12 is a buffer memory in the restored non-interlaced form. Converts the image signal into an interlaced signal. Further, 13 is a D/A converter, which converts a digital signal into an analog signal.
Output to monitor 14.

Here, when outputting in the form of a digital signal, use the D/A
It is output as is without passing through the converter 13. Further, in the buffer memory 12, an interlace signal is obtained by storing one frame of non-interlaced signals and reading out odd lines as the first field and even lines as the second field, contrary to the recording.

As described above, according to this embodiment, since encoding is performed on a non-interlaced signal, high image quality can be obtained through inter-field processing, and the encoding process itself is two-dimensional processing.
It can be realized with a simple circuit.

Note that if the input signal from the camera itself is not an interlaced signal but a non-interlaced signal, the above conversion is not performed in the buffer memory.
It goes without saying that processing should be carried out as is.

Effects of the Invention As described above, according to the present invention, it is possible to process an input image signal in a non-interlaced form, that is, between fields, improving processing accuracy and obtaining high image quality, as well as encoding processing. Since it is a two-dimensional process, it can be realized with a simple circuit and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of an image processing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a reproduction processing section for signals recorded by the image processing apparatus according to the embodiment, and FIG. 3 is an interlaced signal FIG. 4 is a block diagram of a conventional image processing apparatus, and FIG. 5 is an explanatory diagram showing an example of two-dimensional prediction in predictive coding. 5. Camera, 6. A/D converter, 7. Buffer 1 memory, 8. Encoder, 9. Recording processing circuit. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] If the input image signal is an interlaced signal, the image processing apparatus stores the interlaced signal in a memory, reads out the interlaced signal from the memory in the form of a non-interlaced signal, and performs processing.