The key technologies commonly used in the algorithmic composition include Markov chain, random process, knowledge base system based on music rules, music grammar, artificial neural network technology, genetic algorithm, etc. Composer Wolfgang Amadeus Mozart used dice to generate random numbers. They compose music by combining pieces of music. John Cage used the sensor's board and how the pieces were moved across the board to trigger the sound to form a melody . Charles Dorje composes music by calculating the Earth's magnetic field changes by computer. The above music composition methods have high requirements on the professional quality of composers. It cannot be popularized in printed children's books. Huang Zhifang from Shanghai Normal University uses feedback from wearable devices to trigger music algorithms. The method completes music generation according to converting human body movements into random signals. Some scholars have designed an algorithm for composing music based on the characteristics of the Rubik's Cube. The algorithm's core is to apply the principle of random numbers to complete the music generation.
In this paper, an algorithm for converting images into music is established based on finite element differential equations . We use digital images captured or stored in electronic devices as composition material to provide children with inspiration and motivation for composition. We obtain a piece of music melody through an idea to achieve the effect of both pictures, text, and sound.
A melody consists of sounds with pitch, duration, timbre, and volume. It is arranged successively on the score. We pick the notes or pieces of music and number them. We choose the number based on the number of points that appear in the dice roll. We roll the dice multiple times and combine the notes or pieces of music in the order in which the dice points appear . This forms a random melody or harmony of music. We program the finite element differential equation to use random numbers to index into an array of selected pitches. The indexed frequency values form a pitch sequence. This audio can be used for automatic composition. We set the sounding duration of the song. In the finite element differential equations, we choose the frequencies in the array by using random numbers. At this point, we enter Beep. Vi can get a melody. The program block diagram is shown in Figure 1. The program can select the frequency value through the index value generated by the random number and play it in order.
Melody is the main component of music. The creation of melody depends on inspiration. It cannot be obtained by mere reason. So composition requires a certain amount of randomness. However, the algorithm of dice music generating melody cannot complete the control of the direction of the generated melody . It cannot predict the direction of the generated melody. We need to introduce materials to limit random numbers. We determine the evolution of the pitch by the tremendous and low changes of the line. Grayscale histograms have linearly varying features in two-dimensional coordinates. It can be associated with a melody line. The grayscale histogram of a digital image is an important parameter reflecting the characteristics of the picture. A grayscale histogram consists of a series of data. It also tends to go up and down. It can be translated into musical sequences. Because the grayscale histogram takes the form of random variation, the grayscale histogram in the digital image can replace the random number to control the generation of the melody.
The array formed by the grayscale histogram of the image is denoted as
MIDI is short for Musical Instrument Digital Interface. A MIDI file is a music sequence record file consisting of instructions. The finite element differential equations generate MIDI files by writing hexadecimal strings to binary files. Certain lines in the MIDI file have certain functions . Enter lines to get a MIDI file. We convert the generated musical melodies into MIDI files. We need to convert the frequency value into the pitch number in the MIDI file. Its formula is:
We describe the audio degradation process as follows:
In the formula,
Where A represents the derivative of
We take the half-norm-total variation of the Banach space as the regularization term. At this point we get the ROF model:
This is a minimization functional extreme value problem. The first term in the formula is called the loyalty term. This allows the recovered audio
The corresponding diffusion equation is as follows:
The ROF model is a nonlinear anisotropic diffusion equation. The diffusion coefficient |∇
We use a fourth-order PDE to suppress the “staircase effect effectively”. The fourth-order PDE does not turn the audio into several color blocks with different grayscale values like the second-order PDE. Still, it smoothes the audio into a grayscale gradient area. We establish the minimization energy functional as follows:
Where Δ is the Laplace operator. It is similar to the ROF model. We use the variational method to derive the Euler-Lagrange equation for this function as follows:
The corresponding diffusion equation is as follows:
Four subvi are established by finite element differential equations. At this point, we complete the reading, processing, and conversion of the specified digital image. The first level is named grayscale histogram vi. Its function is to read the selected digital image stored in the electronic device and output the image information . The second level is named data selection vi. The function is to process the data of the previous story and control the number of output data. This makes the output array data trend close to the grayscale histogram's fluctuation trend. The third level is named melody generation vi. The function converts the given array into a melody and plays it. The fourth level is called MIDI file generation vi. The position is to generate a MIDI file from the generated song. We implement the calling of each sub-vi by connecting the four sub-vis through the top-level vi. The block diagram of the top-level vi is shown in Figure 2.
The reading of digital image data is completed by the grayscale histogram vi. It reads the image through the IMAQ module of finite element differential equations. We first establish an image cache through the Create control in IMAQ and then use the ReadFile power in IMAQ to develop a path to read the image . The system obtains the grayscale histogram of the image file through the Histogram control in IMAQ. We convert the grayscale histogram of the image to an array
The processing of digital image data is done by data selection vi. This sub-vi function controls the number of output data for processing the array formed by the grayscale histogram. This makes the output array Array2 keep the trend in the collection
The generation of music melody is completed by music generation vi. We process the data according to formula (3). The program block diagram is shown in Figure 3. We index the frequency array by converting the elements into index values. We pass Beep. vi plays and outputs the collection
MIDI vi generates the MIDI file. The system converts the frequency value in
The grayscale histogram reflects the number of pixels in the image at each grayscale. The grayscale histograms of different digital images may have the same trend. The parameter γ specifies the shape of the grayscale histogram curve of the digital image. We gamma transform the same image to achieve brightness adjustment . In this way, different grayscale histograms can be obtained to generate melody lines. Fig. 4 is the Lena image under different γ values, and Fig. 5 is the gray histogram of the image under different γ values.
The generated melody lines are close to the trend of the original grayscale histogram. At this point, the purpose of the design has been achieved. The melody line fluctuation reflects the grayscale histogram's fluctuation trend. A light image with a few tonal layers is straight at the front of the melody line. At this time, the generated melody line has few fluctuations and simple changes. The notes in the melody mostly appear in the bass part.
Figure 4(c) has the richest details. The melody line generated at this time has the most significant fluctuation. We select the C major diatonic scale and the triad to create the music score by processing Fig. 4(c). The results are shown in Figure 6.
It is observed that Figure 6(a) is a melody generated using the C major diatonic scale. Adjacent intervals are not necessarily harmonious. The randomness of melody generation is significant. It can closely reflect the changing trend of the gray histogram. Figure 6(b) The melody produced using triads to form sounds is more harmonious. It is suitable for chord arpeggio generation.
This paper mainly studies the algorithm of generating music melody based on the digital image grayscale histogram based on the finite element differential equation. We analyze the relationship between digital image grayscale histograms and the musical piece. We convert the grayscale histogram of a given digital image into a theme and build a music melody algorithm. We have established an algorithm for generating musical melody based on the grayscale histogram of digital images based on finite element differential equations. We take the standard Lena diagram in printing to verify the algorithm of generating music melody from a digital image grayscale histogram. At this time, we analyze the music melody effect and get a more harmonious music effect. We convert the music melody algorithm to a MIDI file. The article can be played on the computer through music editing software. At this point, we complete the verification of the music melody algorithm.
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